CN112809138B - Large and thick plate welding method and system based on double strip-shaped welding wires - Google Patents

Large and thick plate welding method and system based on double strip-shaped welding wires Download PDF

Info

Publication number
CN112809138B
CN112809138B CN202110103043.2A CN202110103043A CN112809138B CN 112809138 B CN112809138 B CN 112809138B CN 202110103043 A CN202110103043 A CN 202110103043A CN 112809138 B CN112809138 B CN 112809138B
Authority
CN
China
Prior art keywords
welding
strip
shaped
wire
wires
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110103043.2A
Other languages
Chinese (zh)
Other versions
CN112809138A (en
Inventor
杨涛
庄园
胡俊成
刘俊峰
汪远
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Southwest Jiaotong University
Original Assignee
Southwest Jiaotong University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Southwest Jiaotong University filed Critical Southwest Jiaotong University
Priority to CN202110103043.2A priority Critical patent/CN112809138B/en
Publication of CN112809138A publication Critical patent/CN112809138A/en
Application granted granted Critical
Publication of CN112809138B publication Critical patent/CN112809138B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/16—Arc welding or cutting making use of shielding gas
    • B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
    • B23K9/1735—Arc welding or cutting making use of shielding gas and of a consumable electrode making use of several electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/235—Preliminary treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/24—Features related to electrodes
    • B23K9/26—Accessories for electrodes, e.g. ignition tips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/24—Features related to electrodes
    • B23K9/28—Supporting devices for electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

The invention provides a large and thick plate welding method and system based on double strip-shaped welding wires. The method works based on the principle of double-wire arc welding; in the process of welding the large thick plate, the welding bead layer is divided into backing welding, filling welding and cover surface welding; and selecting and arranging the sizes of the strip-shaped welding wires according to the characteristics of different welding channel layers. The system comprises a double-strip welding wire welding gun A, a double-strip welding wire welding gun B and a welding control center; the double-strip welding wire welding gun A is provided with two strip welding wires with the same width; the double-strip welding wire welding gun B is provided with two strip welding wires with different widths; the welding control center is used for presetting a welding program and controlling the double-strip welding wire welding gun A and the double-strip welding wire welding gun B to work according to the preset welding program; the preset welding program comprises the selection of welding modes, including a backing welding mode, a filling welding mode, a cover surface welding mode I and a cover surface welding mode II. By adopting the method and the system thereof, the high-efficiency and high-quality welding of the large thick plate can be realized.

Description

Large and thick plate welding method and system based on double strip-shaped welding wires
Technical Field
The invention provides a large and thick plate welding method and system based on double strip-shaped welding wires, and belongs to the field of welding processing.
Background
At present, the welding method for large thick plates with the thickness exceeding 40mm is mainly MIG/MAG welding and narrow gap laser wire filling welding. The narrow gap laser wire-filling welding has the advantages of high and stable welding quality, but the laser beam has strict requirements on the assembly gap of a workpiece, the metal surface has high laser reflection, the thermal efficiency is low when a molten pool is not formed, and the defects of air holes, undercut and the like are easily generated during welding. For the MIG/MAG welding of a large thick plate, a groove needs to be formed on a workpiece to be welded, the size of the groove is large, the filling amount during welding needs to be increased, and the welding efficiency is reduced.
In order to solve the problems, a double-wire MIG/MAG welding technology is provided, two welding wires pass through the same welding gun according to a certain angle, power is supplied by two independent power supply systems, welding parameters are mutually independent, the interference between the two welding wires is reduced to the maximum extent, and the double-wire welding has low assembly requirements. However, the common double-wire MIG/MAG welding is limited by a welding gun, the groove size is large, the filling amount is larger than that of single-wire MIG/MAG welding, but the welding efficiency is still not high due to the limitation of the welding wire size, especially in large thick plate welding. If the welding efficiency is improved, the filling amount is reduced, and side wall unfused or interlayer unfused is formed.
Therefore, the invention provides a large thick plate welding method and a welding system which have low requirements on assembly clearance, large filling quantity and high welding efficiency.
Disclosure of Invention
The first invention of the present invention is: the method for MIG/MAG welding of the large and thick plate based on the double strip welding wires is provided, and efficient and high-quality welding of the large and thick plate is realized.
The technical scheme adopted by the invention for realizing the first invention is as follows: a method for welding large and thick plates based on double strip-shaped welding wires, which works based on the principle of double-wire electric arc welding, wherein the welding wires are strip-shaped welding wires; in the process of welding the large thick plate, the welding bead layer is divided into backing welding, filling welding and cover surface welding; according to the characteristics on different welding bead layers, carry out size selection and arrange the setting to the band-shaped welding wire, include:
recording the plane of the length and the width of the strip-shaped welding wire as a wide plane, recording the plane of the length and the thickness of the strip-shaped welding wire as a narrow plane, and the width of the strip-shaped welding wire is greater than the thickness of the strip-shaped welding wire; in the welding process, the strip welding wire which is positioned at the front of the two strip welding wires along the welding direction is called a front strip welding wire, and the strip welding wire which is positioned at the back of the two strip welding wires is called a back strip welding wire;
backing welding: selecting two strip-shaped welding wires with different widths, wherein the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are perpendicular to each other, and the wide surface of the front strip-shaped welding wire is perpendicular to the welding direction;
and (3) filling welding: selecting two strip-shaped welding wires with the same width, setting the wide surfaces of the two strip-shaped welding wires to be parallel to each other, and setting the wide surfaces of the two strip-shaped welding wires to be vertical to the welding direction;
and (3) cover surface welding: selecting two strip-shaped welding wires with different widths, wherein the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are arranged to be parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction; or two strip-shaped welding wires with the same width are selected, the wide surfaces of the two strip-shaped welding wires are perpendicular to each other, and the wide surface of the front strip-shaped welding wire is perpendicular to the welding direction.
Further, before the filling welding is carried out, the arc striking ends of the two strip-shaped welding wires are obliquely cut along opposite directions respectively, so that the arc striking positions of the two strip-shaped welding wires are on different sides.
The strip welding wire is preprocessed before welding, namely the arc starting ends of the welding wire are obliquely cut in opposite directions, the arc starting positions are ensured to be on different sides, for example, the left side of the front strip welding wire starts to be filled when arcing is performed, and the right side of the rear strip welding wire starts to be filled when arcing is performed.
Further, the selecting two strip-shaped welding wires with different widths specifically includes: selecting a strip-shaped welding wire with the width of 4-6 mm and a strip-shaped welding wire with the width of 2-3 mm.
Further, the thickness of the two strip wires is the same.
Further, the thickness of both strip-shaped welding wires is 1 mm.
The second object of the present invention is: the MIG/MAG welding system with the double strip welding wires has strong adaptability to welding seams and low requirements on assembly gaps.
The technical scheme adopted by the invention for realizing the second invention purpose is as follows: a system of a large and thick plate welding method based on double strip welding wires comprises a double strip welding wire welding gun and a welding control center; the double-strip welding wire welding gun comprises a double-strip welding wire welding gun A and a double-strip welding wire welding gun B; the double-strip welding wire welding gun A is provided with two strip welding wires with the same width; the double-strip welding wire welding gun B is provided with two strip welding wires with different widths;
the welding control center is used for presetting a welding program and controlling the double-strip welding wire welding gun A and the double-strip welding wire welding gun B to work according to the preset welding program; the preset welding program comprises selection of a welding mode; the welding modes comprise a backing welding mode, a filling welding mode and a cover surface welding mode; the cover surface welding mode comprises a cover surface welding mode I and a cover surface welding mode II;
recording the plane of the length and the width of the strip-shaped welding wire as a wide surface, recording the plane of the length and the thickness of the strip-shaped welding wire as a narrow surface, and enabling the width of the strip-shaped welding wire to be larger than the thickness of the strip-shaped welding wire; in the welding process, the strip-shaped welding wire which is positioned at the front in the welding direction in the two strip-shaped welding wires is called a front strip-shaped welding wire, and the strip-shaped welding wire which is positioned at the back is called a back strip-shaped welding wire;
the setting mode of the double-strip welding wires in the backing welding mode is as follows: the width of the two strip-shaped welding wires is different, the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are mutually vertical, and the wide surface of the front strip-shaped welding wire is vertical to the welding direction;
the arrangement mode of the double strip-shaped welding wires in the filling welding mode is as follows: the width of the two strip-shaped welding wires is the same, the wide surfaces of the two strip-shaped welding wires are parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction;
the arrangement mode of the double strip-shaped welding wires in the first cover surface welding mode is as follows: the width of the two strip-shaped welding wires is different, the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction;
the arrangement mode of the double strip-shaped welding wires in the second cover surface welding mode is as follows: the width of the two strip-shaped welding wires is the same, the wide surfaces of the two strip-shaped welding wires are mutually vertical, and the wide surface of the front strip-shaped welding wire is vertical to the welding direction;
if the backing welding mode is executed, the welding control center firstly controls the double-strip-shaped welding wire welding gun B to adjust the positions of two strip-shaped welding wires according to the setting mode of the double strip-shaped welding wires in the backing welding mode, and then controls the double-strip-shaped welding wire welding gun B to weld a workpiece to be welded; at this time, the double strip welding wire welding gun A is in a standby state;
if the filling welding mode is executed, the welding control center firstly controls the double-strip-shaped welding wire welding gun A to adjust the positions of two strip-shaped welding wires according to the setting mode of the double strip-shaped welding wires in the filling welding mode, and then controls the double-strip-shaped welding wire welding gun A to weld a workpiece to be welded; at the moment, the double-strip welding wire welding gun B is in a standby state;
if the cover welding mode I is executed, the welding control center firstly controls the double-strip-shaped welding wire welding gun B to adjust the positions of two strip-shaped welding wires according to the setting mode of the double-strip-shaped welding wires in the cover welding mode I, and then controls the double-strip-shaped welding wire welding gun B to weld a workpiece to be welded; at this time, the double strip welding wire welding gun A is in a standby state;
if the cover welding mode II is executed, the welding control center firstly controls the double-strip-shaped welding wire welding gun A to adjust the positions of two strip-shaped welding wires according to the setting mode of the double-strip-shaped welding wires in the cover welding mode II, and then controls the double-strip-shaped welding wire welding gun A to weld a workpiece to be welded; at this time, the double strip welding torch B is in a standby state.
Further, the preset welding program comprises division of the number of welding bead layers, setting of an execution sequence of the welding bead layers, selection of a welding mode of each welding bead layer and setting of welding parameters of each welding bead layer.
Further, the structure of the double strip welding wire torch includes: the welding device comprises a strip welding wire buckle, a strip contact nozzle, a front strip welding wire, a rear strip welding wire, a driving gear, a driven gear and a stepping motor; the welding control center controls the double-strip welding wire welding gun to adjust the positions of the two strip welding wires according to the setting mode of the double strip welding wires in different welding modes, and the welding control center specifically comprises the following steps: the welding control center controls the stepping motor to rotate, a driving gear connected with the stepping motor starts to rotate and drives the driven gear to rotate, so that a rear strip-shaped welding wire penetrating through the interior of the driven gear is driven to rotate, and when the rear strip-shaped welding wire rotates to a specified position, the stepping motor stops rotating; the strip-shaped welding wire buckle is used for clamping the strip-shaped welding wire; the strip-shaped contact tip is used for guiding and feeding strip-shaped welding wires.
The cooperation of banded welding wire buckle and banded contact tube can guarantee the straightness nature of welding wire, prevents that the welding wire from appearing crooked, strengthens welding process's stability, improves conduction current's ability.
Further, the strip-shaped welding wire supporting end of the strip-shaped welding wire buckle is provided with an elastic structure, the elastic structure can move elastically in the width direction of the strip-shaped welding wire, and the strip-shaped welding wire buckle is suitable for clamping strip-shaped welding wires with different widths.
To different strip-shaped welding wires, its width difference is great to the strip-shaped welding wire buckle is the device that is located welder inside, and it is troublesome to change, consequently is equipped with elastic construction at the strip-shaped welding wire support end of strip-shaped welding wire buckle, can be along the width direction of strip-shaped welding wire elastic motion, can adapt to the strip-shaped welding wire of different widths, reduces and changes the trouble, improves work efficiency.
Further, the system also comprises a welding robot A, a welding robot B, a workbench, a welding power supply and a gas cylinder.
The invention relates to the following main working principles:
the principle of double-wire arc welding: double-wire welding (double-wire arc welding) is to put welding wires in a specific welding gun at a certain angle, two welding wires are powered by two independent power supplies, and the two welding wires are insulated from each other; the two power supplies are cooperatively matched with each other through the power supply device to output current, so that heat is distributed on the front welding wire and the rear welding wire, and arc heat is fully utilized. Two welding wires are arranged in a front-back mode, the current of the front welding wire is slightly larger than that of the rear welding wire so as to increase the penetration, and the rear welding wire mainly plays a filling role. The welding seam obtained by the method is integrally convex and is suitable for facing welding, so that the method is suitable for welding thin plates. When a large thick plate is welded, the filling welding bead is convex, and the defects of interlayer fusion failure and the like are easily generated. Therefore, the invention provides a method and a system for welding a large thick plate based on double strip-shaped welding wires, which are obtained by improving the principle of double-wire arc welding.
(II) working principle of the strip-shaped welding wire: the arc of the strip wire is not generated at one fixed position of the wire, but at multiple positions at the bottom of the wire. When large-current welding is carried out, the energy of the electric arc is increased, a plurality of electric arcs can be coupled to form one electric arc, the current is dispersed, the current density is reduced, and the welding stability is improved. In addition, even under stable welding parameters, the shape and position of the arc at the wire end changes, moving left and right at the wire end. The reason is that the melting conditions of the end parts of the strip-shaped welding wires are different, the distance between the end parts of the strip-shaped welding wires and the bottom of the groove is changed constantly, the minimum voltage principle prompts the cathode spots to find the shortest current channel, and the electric arc always exists at the shortest distance between the end parts of the welding wires and the bottom of the groove and shows that the electric arc swings left and right on two sides of the welding wires, so that the side walls and the bottom are heated, and the side wall is reduced from being not fused. Based on the principle, the arc is firstly formed on two sides of the end part of the welding wire, the molten drop is preferentially transited to two sides of the groove, and when the welding speed is high, the filling amount on two sides of the groove is inevitably larger than that in the middle of the groove, so that the welding efficiency is limited. Therefore, the invention provides several setting modes of the strip-shaped welding wires based on the working principle of the strip-shaped welding wires, and the setting modes mainly comprise the size setting and the arrangement setting of the strip-shaped welding wires.
Compared with the prior art, the invention has the following beneficial effects:
the welding method and the welding system for the large thick plate have the advantages of strong adaptability to welding seams, low requirement on assembly gaps, large filling amount and high welding efficiency, and can realize high-efficiency and high-quality welding of the large thick plate.
And in the welding system with the double strip welding wires, the electric arc of the front strip welding wire can preheat a workpiece to be welded, the side wall is reduced from being not fused, and the welding quality is improved. Meanwhile, the welding wires arranged in tandem can increase the size of a molten pool, ensure the escape time of bubbles in the molten pool and reduce the forming tendency of air holes.
The invention provides several setting modes of the strip welding wire based on the working principle of the strip welding wire, and the setting modes are respectively suitable for backing welding, filling welding and cover surface welding.
a. The backing welding method has the advantages that the welding is carried out, the penetration depth is large, the truncated edges can be welded thoroughly, back chipping is not needed, meanwhile, the filling amount of the two sides of the groove is larger than that of the middle part, a concave welding line is formed, and the phenomenon that the side wall is not fused during subsequent filling welding is avoided.
b. The filling welding setting mode of the invention is adopted for welding, the filling quantity is large, the requirement on the size of the groove of the large thick plate is low, and the accessibility of a welding gun can be ensured.
c. The cover welding is carried out in a first mode (namely, the widths of the two strip welding wires are different, the width of the front strip welding wire is larger than that of the rear strip welding wire, the wide surfaces of the two strip welding wires are parallel to each other, and the wide surfaces of the two strip welding wires are perpendicular to the welding direction), the filling amount in the middle of the welding seam is higher than that of the two sides of the welding seam, a convex welding seam is formed, and on the basis of ensuring the filling amount and the accessibility of a welding gun, the welding seam forming of the cover welding and the integral mechanical property of the welding seam are ensured.
d. Welding in a second cover welding mode (namely, the two strip welding wires have the same width, the wide surfaces of the two strip welding wires are vertical to each other, and the wide surface of the front strip welding wire is vertical to the welding direction), so that the filling amount in the middle of a welding seam is increased, the penetration is increased, the remelting effect is realized on the middle of the welding seam, a convex welding seam is formed, and the welding seam is ensured to be formed; but also homogenizes the weld structure and improves the mechanical property of the weld.
The present invention will be described in further detail with reference to the following detailed description and the accompanying drawings, which are not intended to limit the scope of the invention.
Drawings
FIG. 1 is a schematic view of a double strip wire arrangement for backing welding according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a dual strip wire configuration for a filler weld according to an embodiment of the present invention.
FIG. 3 is a schematic view of a dual strip welding wire arrangement for face welding according to an embodiment of the present invention.
FIG. 4 is a schematic view of a second arrangement of the double strip welding wires for the face welding according to the embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a system of a welding method for a large thick plate based on a dual-strip welding wire according to an embodiment of the present invention, where 1 is a welding robot a, 2 is a dual-strip welding wire welding gun a, 3 is a workbench, 4 is a dual-strip welding wire welding gun B, 5 is a welding robot B, 6 is a welding control center, 7 is a welding power supply, and 8 is a gas cylinder.
Fig. 6 is a perspective view of a double strip welding gun B according to an embodiment of the present invention in a backing welding mode.
FIG. 7 is a perspective view of a dual strip welding gun A in a fill welding mode in accordance with an embodiment of the present invention.
FIG. 8 is a perspective view of a dual strip welding gun B of an embodiment of the present invention in a first weld overlay mode.
Fig. 9 is a perspective view of the double strip welding gun a in the second welding mode according to the embodiment of the present invention.
In fig. 6-9, a is a strip welding wire buckle, b is a strip contact tip, c is a front strip welding wire, d is a rear strip welding wire, e is a driving gear, f is a driven gear, and g is a stepping motor.
Detailed Description
Examples
The embodiment provides a method and a system for welding a large thick plate based on double strip-shaped welding wires.
The welding method adopted by the embodiment works based on the principle of double-wire arc welding, and the welding wire is a strip-shaped welding wire; in the process of welding the large thick plate, the welding bead layer is divided into backing welding, filling welding and cover surface welding; according to the characteristics on different welding bead layers, carry out size selection and arrange the setting to the band-shaped welding wire, include:
recording the plane of the length and the width of the strip-shaped welding wire as a wide plane, recording the plane of the length and the thickness of the strip-shaped welding wire as a narrow plane, and the width of the strip-shaped welding wire is greater than the thickness of the strip-shaped welding wire; in the welding process, the strip wire that is positioned forward in the welding direction of the two strip wires is referred to as a front strip wire, and the strip wire that is positioned rearward is referred to as a rear strip wire.
The double-strip welding wire of backing welding selects and sets up the mode: two strip-shaped welding wires with different widths are selected, the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are perpendicular to each other, and the wide surface of the front strip-shaped welding wire is perpendicular to the welding direction. FIG. 1 is a schematic view showing the arrangement of the double strip welding wires in the backing welding of this example.
The double-strip welding wire selection and setting mode of filling welding is as follows: two strip-shaped welding wires with the same width are selected, the wide surfaces of the two strip-shaped welding wires are arranged to be parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction. Fig. 2 is a schematic diagram showing the arrangement of the double strip welding wires in the filler welding of the present embodiment.
The method comprises the following steps of (1) selecting and setting a double-strip welding wire for cover surface welding: two strip-shaped welding wires with different widths are selected, the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are arranged to be parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction. FIG. 3 is a schematic view showing a double strip welding wire arrangement for the face welding of the present embodiment.
Selecting and setting a second double-strip welding wire for cover surface welding: two strip-shaped welding wires with the same width are selected, the wide surfaces of the two strip-shaped welding wires are perpendicular to each other, and the wide surface of the front strip-shaped welding wire is perpendicular to the welding direction. FIG. 4 is a schematic view showing a second arrangement of the double strip welding wires in the case of the cap welding.
In this example, before the filler welding, the arc starting ends of the two strip-shaped welding wires were cut obliquely in opposite directions, respectively, so that the arc starting positions of the two strip-shaped welding wires were on different sides.
Two strip-shaped welding wires with different widths are selected in the embodiment, and the method specifically comprises the following steps: selecting a strip-shaped welding wire with the width of 4-6 mm and a strip-shaped welding wire with the width of 2-3 mm.
The two strip wires of this example are of the same thickness and are 1 mm.
In addition, the welding system provided by the embodiment includes a double strip welding gun, a welding control center 6, as shown in fig. 5; the double-strip welding wire welding gun comprises a double-strip welding wire welding gun A2 and a double-strip welding wire welding gun B4; the double-strip welding wire welding gun A2 is provided with two strip welding wires with the same width; twin ribbon wire torch B4 mounts two ribbon wires of different widths. The welding system of the embodiment further comprises a welding robot A1, a welding robot B5, a workbench 3, a welding power supply 7 and a gas cylinder 8.
The welding control center 6 is used for presetting a welding program and controlling the double-strip welding wire gun A2 and the double-strip welding wire gun B4 to work according to the preset welding program; the preset welding program comprises selection of a welding mode; the welding mode comprises a backing welding mode, a filling welding mode and a cover surface welding mode; the cover surface welding mode comprises a cover surface welding mode I and a cover surface welding mode II.
The arrangement of the double strip wire in the backing welding mode (as shown in fig. 1) is as follows: the width of the two strip-shaped welding wires is different, the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are perpendicular to each other, and the wide surface of the front strip-shaped welding wire is perpendicular to the welding direction.
The arrangement of the double strip wire in the filler welding mode (as shown in fig. 2) is as follows: the width of the two strip-shaped welding wires is the same, the wide surfaces of the two strip-shaped welding wires are parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction.
The arrangement of the double strip welding wires in the first welding mode (as shown in fig. 3) is as follows: the width of the two strip-shaped welding wires is different, the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction.
The arrangement of the double strip welding wires in the second welding mode (as shown in fig. 4) is as follows: the width of the two strip-shaped welding wires is the same, the wide surfaces of the two strip-shaped welding wires are perpendicular to each other, and the wide surface of the front strip-shaped welding wire is perpendicular to the welding direction.
If the backing welding mode is executed, the welding control center 6 first controls the double-strip-wire welding gun B4 to adjust the positions of the two strip-shaped wires according to the arrangement of the double strip-shaped wires in the backing welding mode (fig. 6 shows the structural perspective view of the double-strip-wire welding gun B4 in the backing welding mode), and then controls the double-strip-wire welding gun B4 to weld the workpiece to be welded; at this time, the double strip welding torch a2 is on standby.
If the filler welding mode is executed, the welding control center 6 first controls the double strip welding gun a2 to adjust the positions of the two strip welding wires according to the arrangement mode of the double strip welding wires in the filler welding mode (fig. 7 shows the structural perspective view of the double strip welding gun a2 in the filler welding mode in this example), and then controls the double strip welding gun a2 to weld the workpiece to be welded; at this time, double strip welding gun B4 is in a standby state.
If the first cover welding mode is executed, the welding control center 6 first controls the double strip welding gun B4 to adjust the positions of the two strip welding wires according to the arrangement mode of the double strip welding wires in the first cover welding mode (fig. 8 shows the structural perspective view of the double strip welding gun B4 in the first cover welding mode), and then controls the double strip welding gun B4 to weld the workpiece to be welded; at this time, the double strip welding torch a2 is on standby.
If the second cover welding mode is executed, the welding control center 6 first controls the double strip welding gun a2 to adjust the positions of the two strip welding wires according to the setting mode of the double strip welding wires in the second cover welding mode (fig. 9 shows the structural perspective view of the double strip welding gun a2 in the second cover welding mode), and then controls the double strip welding gun a2 to weld the workpiece to be welded; at this time, double strip welding gun B4 is in a standby state.
The preset welding program of the embodiment comprises the division of the number of welding bead layers, the setting of the execution sequence of the welding bead layers, the selection of the welding mode of each welding bead layer and the setting of the welding parameters of each welding bead layer.
The structure of the double-strip welding gun of the present embodiment is shown in fig. 6-9, and comprises: the welding device comprises a strip welding wire buckle a, a strip contact tip b, a front strip welding wire c, a rear strip welding wire d, a driving gear e, a driven gear f and a stepping motor g; the welding control center 6 controls the position of the two strip welding wires of the double-strip welding wire welding gun to be adjusted according to the setting mode of the double-strip welding wires in different welding modes, and the method specifically comprises the following steps: the welding control center 6 controls the stepping motor g to rotate, a driving gear e connected with the stepping motor g starts to rotate and drives the driven gear f to rotate, so that a rear strip-shaped welding wire d penetrating through the interior of the driven gear f is driven to rotate, and when the rear strip-shaped welding wire d rotates to a specified position, the stepping motor g stops rotating; the strip-shaped welding wire buckle a is used for clamping the strip-shaped welding wire; the strip-shaped contact tip b is used for guiding the strip-shaped welding wire.
The strip-shaped welding wire supporting end of the strip-shaped welding wire buckle a is provided with an elastic structure, the elastic structure can do elastic movement along the width direction of the strip-shaped welding wire, and the strip-shaped welding wire buckle a is suitable for clamping strip-shaped welding wires with different widths.
The method of operation of the welding system of the present example is briefly described as follows:
and S1, preprocessing the workpiece to be welded, and fixing the workpiece to be welded on the workbench 3 in a butt joint mode according to the part to be welded.
And S2, presetting a welding program according to the actual situation of the workpiece to be welded, wherein the welding program comprises the division of the number of welding bead layers, the setting of the execution sequence of the welding bead layers, the selection of the welding mode of each welding bead layer and the setting of the welding parameters of each welding bead layer.
Dividing the number of layers of the welding bead in the embodiment: the welding bead layer is divided into five layers according to the specific condition of the workpiece to be welded for welding.
The execution sequence of the welding layer of the present example is as follows: and performing backing welding on the first layer, sequentially performing filling welding on the second layer, the third layer and the fourth layer, and finally performing cover surface welding on the fifth layer.
Selection of welding mode for each weld pass layer in this example: the backing welding of the first layer selects a backing welding mode, the filling welding of the second layer, the third layer and the fourth layer selects a filling welding mode, and the cover welding of the fifth layer selects a cover welding mode II.
S3, the welding system enters a welding working state, and backing welding of a first layer is executed: the welding control center 6 firstly controls the double-strip welding wire gun B4 to adjust the positions of the two strip welding wires according to the setting mode of the double-strip welding wires in the backing welding mode (as shown in fig. 6), and then controls the double-strip welding wire gun B4 to weld the workpiece to be welded; at this time, the double strip welding torch a2 is on standby.
S4, the backing welding of the first layer is completed, and the double strip wire welding gun B4 returns to the initial standby state.
S5, performing filling welding of a second layer: the welding control center 6 first controls the double-strip welding wire welding gun a2 to adjust the positions of the two strip welding wires according to the setting mode of the double strip welding wires in the filler welding mode (as shown in fig. 7), and then controls the double-strip welding wire welding gun a2 to weld the workpiece to be welded; at this time, double strip welding gun B4 is in a standby state.
S6, the second-tier filler welding is completed, and the double strip welding gun a2 returns to the initial standby state.
S7, performing filling welding of the third layer: the welding control center 6 firstly controls the double-strip welding wire gun a2 to adjust the positions of the two strip welding wires according to the setting mode of the double-strip welding wires in the filling welding mode (as shown in fig. 7), and then controls the double-strip welding wire gun a2 to weld the workpiece to be welded; at this time, double strip welding gun B4 is in a standby state.
S8, the third layer of the filler weld is completed, and the double strip welding torch a2 returns to the initial standby state.
S9, performing filling welding of a fourth layer: the welding control center 6 firstly controls the double-strip welding wire gun a2 to adjust the positions of the two strip welding wires according to the setting mode of the double-strip welding wires in the filling welding mode (as shown in fig. 7), and then controls the double-strip welding wire gun a2 to weld the workpiece to be welded; at this time, double strip welding gun B4 is in a standby state.
S10, the fourth layer of filler welding is completed, and the double strip welding gun a2 returns to the initial standby state.
S11, performing cover surface welding of the fifth layer: the welding control center 6 firstly controls the double-strip welding wire gun A2 to adjust the positions of the two strip welding wires according to the setting mode of the double-strip welding wires in the cover welding mode II (as shown in FIG. 9), and then controls the double-strip welding wire gun A2 to weld the workpiece to be welded; at this time, double strip welding gun B4 is in a standby state.
And S12, finishing the cover surface welding of the fifth layer, returning the double-strip welding wire welding gun A2 to the initial standby state, and finishing the welding work.
While the present invention has been described above by way of example with reference to the accompanying drawings, it is to be understood that the invention is not limited to the specific embodiments shown herein.

Claims (9)

1. A method for welding large and thick plates based on double strip-shaped welding wires, which works based on the principle of double-wire electric arc welding, is characterized in that the welding wires are strip-shaped welding wires; in the process of welding the large thick plate, the welding bead layer is divided into backing welding, filling welding and cover surface welding; according to the characteristics on different welding bead layers, carry out size selection and arrange the setting to the band-shaped welding wire, include:
recording the plane of the length and the width of the strip-shaped welding wire as a wide plane, recording the plane of the length and the thickness of the strip-shaped welding wire as a narrow plane, and the width of the strip-shaped welding wire is greater than the thickness of the strip-shaped welding wire; in the welding process, the strip-shaped welding wire which is positioned at the front in the welding direction in the two strip-shaped welding wires is called a front strip-shaped welding wire, and the strip-shaped welding wire which is positioned at the back is called a back strip-shaped welding wire;
backing welding: selecting two strip-shaped welding wires with different widths, wherein the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are perpendicular to each other, and the wide surface of the front strip-shaped welding wire is perpendicular to the welding direction;
and (3) filling welding: selecting two strip-shaped welding wires with the same width, setting the wide surfaces of the two strip-shaped welding wires to be parallel to each other, and setting the wide surfaces of the two strip-shaped welding wires to be vertical to the welding direction;
and (3) cover surface welding: selecting two strip-shaped welding wires with different widths, wherein the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are arranged to be parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction; or selecting two strip-shaped welding wires with the same width, setting the wide surfaces of the two strip-shaped welding wires to be mutually vertical, and setting the wide surface of the front strip-shaped welding wire to be vertical to the welding direction;
before the filling welding is carried out, the arc striking ends of the two strip-shaped welding wires are respectively cut obliquely along opposite directions, so that the arc striking positions of the two strip-shaped welding wires are on different sides;
the thickness of the large thick plate exceeds 40 mm.
2. The method for welding large and thick plates based on double strip welding wires according to claim 1, wherein two strip welding wires with different widths are selected, specifically: selecting a strip-shaped welding wire with the width of 4-6 mm and a strip-shaped welding wire with the width of 2-3 mm.
3. The method for welding large and thick plates based on double strip welding wires according to claim 1, wherein the two strip welding wires have the same thickness.
4. The method for welding large and thick plates based on the double strip welding wires as claimed in claim 3, wherein the thickness of both strip welding wires is 1 mm.
5. A system for the welding method of large and thick plates based on double strip welding wires according to any one of claims 1 to 4, characterized in that the system comprises a double strip welding gun, a welding control center; the double-strip welding wire welding gun comprises a double-strip welding wire welding gun A and a double-strip welding wire welding gun B; the double-strip welding wire welding gun A is provided with two strip welding wires with the same width; the double-strip welding wire welding gun B is provided with two strip welding wires with different widths;
the welding control center is used for presetting a welding program and controlling the double-strip welding wire welding gun A and the double-strip welding wire welding gun B to work according to the preset welding program; the preset welding program comprises selection of a welding mode; the welding modes comprise a backing welding mode, a filling welding mode and a cover surface welding mode; the cover surface welding mode comprises a cover surface welding mode I and a cover surface welding mode II;
recording the plane of the length and the width of the strip-shaped welding wire as a wide plane, recording the plane of the length and the thickness of the strip-shaped welding wire as a narrow plane, and the width of the strip-shaped welding wire is greater than the thickness of the strip-shaped welding wire; in the welding process, the strip-shaped welding wire which is positioned at the front in the welding direction in the two strip-shaped welding wires is called a front strip-shaped welding wire, and the strip-shaped welding wire which is positioned at the back is called a back strip-shaped welding wire;
the setting mode of the double-strip welding wires in the backing welding mode is as follows: the width of the two strip-shaped welding wires is different, the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are mutually vertical, and the wide surface of the front strip-shaped welding wire is vertical to the welding direction;
the arrangement mode of the double strip-shaped welding wires in the filling welding mode is as follows: the width of the two strip-shaped welding wires is the same, the wide surfaces of the two strip-shaped welding wires are parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction;
the arrangement mode of the double strip-shaped welding wires in the first cover surface welding mode is as follows: the width of the two strip-shaped welding wires is different, the width of the front strip-shaped welding wire is larger than that of the rear strip-shaped welding wire, the wide surfaces of the two strip-shaped welding wires are parallel to each other, and the wide surfaces of the two strip-shaped welding wires are perpendicular to the welding direction;
the arrangement mode of the double strip-shaped welding wires in the second cover surface welding mode is as follows: the width of the two strip-shaped welding wires is the same, the wide surfaces of the two strip-shaped welding wires are mutually vertical, and the wide surface of the front strip-shaped welding wire is vertical to the welding direction;
if the backing welding mode is executed, the welding control center firstly controls the double-strip-shaped welding wire welding gun B to adjust the positions of two strip-shaped welding wires according to the setting mode of the double strip-shaped welding wires in the backing welding mode, and then controls the double-strip-shaped welding wire welding gun B to weld a workpiece to be welded; at this time, the double strip welding wire welding gun A is in a standby state;
if the filling welding mode is executed, the welding control center firstly controls the double-strip-shaped welding wire welding gun A to adjust the positions of two strip-shaped welding wires according to the setting mode of the double strip-shaped welding wires in the filling welding mode, and then controls the double-strip-shaped welding wire welding gun A to weld a workpiece to be welded; at the moment, the double-strip welding wire welding gun B is in a standby state;
if the cover welding mode I is executed, the welding control center firstly controls the double-strip-shaped welding wire welding gun B to adjust the positions of two strip-shaped welding wires according to the setting mode of the double-strip-shaped welding wires in the cover welding mode I, and then controls the double-strip-shaped welding wire welding gun B to weld a workpiece to be welded; at this time, the double strip welding wire welding gun A is in a standby state;
if the cover welding mode II is executed, the welding control center firstly controls the double-strip-shaped welding wire welding gun A to adjust the positions of two strip-shaped welding wires according to the setting mode of the double-strip-shaped welding wires in the cover welding mode II, and then controls the double-strip-shaped welding wire welding gun A to weld a workpiece to be welded; at this time, the double strip welding torch B is in a standby state.
6. The system according to claim 5, wherein the preset welding program comprises division of the number of weld bead layers, setting of execution sequence of the weld bead layers, selection of welding mode of each weld bead layer, and setting of welding parameters of each weld bead layer.
7. The system of claim 5, wherein the structure of the twin ribbon wire welding gun comprises: the welding device comprises a strip welding wire buckle, a strip contact nozzle, a front strip welding wire, a rear strip welding wire, a driving gear, a driven gear and a stepping motor; the welding control center controls the double-strip welding wire welding gun to adjust the positions of the two strip welding wires according to the setting mode of the double strip welding wires in different welding modes, and the welding control center specifically comprises the following steps: the welding control center controls the stepping motor to rotate, a driving gear connected with the stepping motor starts to rotate and drives the driven gear to rotate, so that a rear strip-shaped welding wire penetrating through the interior of the driven gear is driven to rotate, and when the rear strip-shaped welding wire rotates to a specified position, the stepping motor stops rotating; the strip-shaped welding wire buckle is used for clamping the strip-shaped welding wire; the strip-shaped contact tip is used for guiding and feeding strip-shaped welding wires.
8. The system of claim 7, wherein the strip wire support end of the strip wire clamp is provided with a resilient structure capable of resiliently moving in the width direction of the strip wire, and the strip wire clamp is suitable for clamping strip wires of different widths.
9. The system of claim 5, further comprising welding robot A, welding robot B, a work table, a welding power supply, a gas cylinder.
CN202110103043.2A 2021-01-26 2021-01-26 Large and thick plate welding method and system based on double strip-shaped welding wires Active CN112809138B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110103043.2A CN112809138B (en) 2021-01-26 2021-01-26 Large and thick plate welding method and system based on double strip-shaped welding wires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110103043.2A CN112809138B (en) 2021-01-26 2021-01-26 Large and thick plate welding method and system based on double strip-shaped welding wires

Publications (2)

Publication Number Publication Date
CN112809138A CN112809138A (en) 2021-05-18
CN112809138B true CN112809138B (en) 2022-05-06

Family

ID=75859318

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110103043.2A Active CN112809138B (en) 2021-01-26 2021-01-26 Large and thick plate welding method and system based on double strip-shaped welding wires

Country Status (1)

Country Link
CN (1) CN112809138B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114951921B (en) * 2022-06-09 2024-03-08 斯图加特航空自动化（青岛）有限公司 Double-wire narrow-gap GMAW welding device for middle groove thick plate of scraper conveyor of coal machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59178175A (en) * 1983-03-28 1984-10-09 Hitachi Zosen Corp Band arc welding method
JPS61154774A (en) * 1984-12-27 1986-07-14 Toshiba Corp Arc welding method
CN102642070A (en) * 2012-04-20 2012-08-22 哈尔滨工业大学 Narrow-gap GMAW (gas metal arc welding) method for band electrode
CN103648701A (en) * 2011-07-01 2014-03-19 林肯环球股份有限公司 Tandem strip cladding method, apparatus and system
CN107350604A (en) * 2017-07-19 2017-11-17 广东省焊接技术研究所（广东省中乌研究院） A kind of biobelt pole submerged arc overlay welding method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59178175A (en) * 1983-03-28 1984-10-09 Hitachi Zosen Corp Band arc welding method
JPS61154774A (en) * 1984-12-27 1986-07-14 Toshiba Corp Arc welding method
CN103648701A (en) * 2011-07-01 2014-03-19 林肯环球股份有限公司 Tandem strip cladding method, apparatus and system
CN102642070A (en) * 2012-04-20 2012-08-22 哈尔滨工业大学 Narrow-gap GMAW (gas metal arc welding) method for band electrode
CN107350604A (en) * 2017-07-19 2017-11-17 广东省焊接技术研究所（广东省中乌研究院） A kind of biobelt pole submerged arc overlay welding method

Also Published As

Publication number Publication date
CN112809138A (en) 2021-05-18

Similar Documents

Publication Publication Date Title
CN111716003B (en) Aluminum alloy pulse laser-TIG electric arc composite additive manufacturing device and method
CN108907414B (en) High-deposition-efficiency high-welding-speed double-tungsten-electrode TIG (tungsten inert gas) narrow-gap welding method
CN107530810B (en) Horizontal fillet welding method, horizontal fillet welding system and storage medium
WO2003082511A1 (en) Yag laser induced arc filler wire composite welding method and welding equipment
WO2022012000A1 (en) All-position consumable electrode arc-laser double-sided hybrid welding process and device thereof
JP2014510642A (en) Thick plate joining method and apparatus using hybrid laser submerged arc welding process
JP2008173664A (en) Vertical position welding method
CN108453388B (en) Double-laser-induced arc penetration welding method and welding device for T-shaped structural part
JP2008173664A5 (en)
CN110369829B (en) Electro-gas welding device and welding method
CN111673283B (en) Multilayer laser-TIG (tungsten inert gas) hybrid welding device and method for aluminum alloy thick plate
CN110052712B (en) Non-axisymmetric rotating tungsten electrode GTAW and pulse laser composite welding method
CN111515541A (en) Thick plate narrow gap laser-TIG composite filler wire welding device and method
CN112809138B (en) Large and thick plate welding method and system based on double strip-shaped welding wires
JP5318543B2 (en) Laser-arc combined welding method
JP3582811B2 (en) Vertical Electro Gas Welding Equipment
CN103433630A (en) Laser-electric arc composite spot welding method for pulsed wire feeding
CN113427131A (en) Pulse wire feeding method for laser-GMA electric arc composite heat source wire filling welding
KR101253858B1 (en) Electro Gas Arc Welding Device and Welding Method
CN210281087U (en) Hybrid welding device and hybrid welding system
CN203765179U (en) Hybrid welding device with plasma arc mode and consumable electrode electric arc mode
CN111515539B (en) Circumferential weld laser-TIG (tungsten inert gas) hybrid welding device and using method
CN114247966A (en) Dual-wire dissimilar material welding and additive method based on variable polarity power supply
KR101117337B1 (en) Apparatus for multiple electrode weaving submerged arc welding and welding method using the same
KR101268734B1 (en) Apparatus for electro gas welding using with two electrodes using ceramic coated tip

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information

Inventor after: Yang Tao

Inventor after: Zhuang Yuan

Inventor after: Hu Juncheng

Inventor after: Liu Junfeng

Inventor after: Wang Yuan

Inventor before: Yang Tao

Inventor before: Hu Juncheng

Inventor before: Zhuang Yuan

Inventor before: Liu Junfeng

Inventor before: Wang Yuan

CB03 Change of inventor or designer information
GR01 Patent grant
GR01 Patent grant