CN112719588B - Thick plate narrow gap double-side swinging laser wire filling vertical welding method - Google Patents
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/12—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure
- B23K26/123—Working by laser beam, e.g. welding, cutting or boring in a special atmosphere, e.g. in an enclosure in an atmosphere of particular gases
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/60—Preliminary treatment
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- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
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Abstract
The invention provides a narrow-gap double-side-swinging laser wire-filling vertical welding method for a thick plate, which comprises the following steps of designing a groove; step two, symmetrically arranging a laser head, a wire feeding nozzle and a shielding gas device at the groove positions on two sides, wherein the wire feeding nozzle is positioned above the laser head, the shielding gas device is positioned below the laser head, adjusting the angle between the laser head and the welding direction, adjusting the angle between the wire feeding nozzle and the welding direction, adjusting the angle between the shielding gas device and the welding direction, and adjusting the positions of the tip of a welding wire of a welding gun and a laser spot on a test piece to be welded; step three, backing welding; step four, filling welding; and step five, cover surface welding. The invention adopts a double-side laser welding mode, has higher efficiency than single-side laser welding on the premise of ensuring the high quality of a welding joint, is easy to control the welding deformation, changes the welding temperature field, reduces the solidification speed and the size of columnar crystals due to the preheating effect of one side to the other side, and has good welding quality.
Description
Technical Field
The invention belongs to the technical field of laser processing, and particularly relates to a narrow-gap double-side-swinging laser wire-filling vertical welding method for a thick plate.
Background
With the development and demand of high speed of industrial technology, the manufacturing industries of high-end equipment such as power generation equipment, machine tool equipment, ship manufacturing, petrochemical engineering, ocean engineering, aerospace and the like are developing towards more intellectualization and large-scale, especially the requirements for welding medium and large plates in large structural parts are more and more, for some workpieces with larger sizes, assembly is difficult to complete after flat welding connection, and for some special positions, vertical welding is needed to complete connection. Therefore, new welding techniques are needed to ensure the quality and efficiency of the welded joint.
Because of the great advantages of the narrow gap welding technology in large thick plates, the narrow gap welding technology is applied more in vertical welding application of industrial large thick plates at present, for example, narrow gap TIG electric arc vertical welding, narrow gap MIG electric arc vertical welding and the like, and the defects of great heat damage, large weld grains, low welding efficiency and the like are easily generated. However, the narrow gap laser welding technique is widely used in the flat welding, and a narrower groove can be adopted, so that the number of filling layers can be greatly reduced to improve the welding efficiency. However, in vertical welding, due to the influence of gravity, liquid metal in a welding pool tends to flow downwards, the stability of the welding process is greatly influenced by the instability of the welding pool, and if too much metal is filled in a single channel, the welding seam is poor in forming, and the welding quality of subsequent passes is influenced. The application of the narrow-gap laser wire-filling vertical welding technology in practical engineering is influenced by low welding efficiency and long cleaning time between layers after welding.
Disclosure of Invention
In view of the above, the present invention aims to provide a narrow-gap double-side-swinging laser wire-filling vertical welding method for thick plates, which adopts a double-side laser welding mode, has high welding efficiency and easy control of welding deformation on the premise of ensuring high quality of welding joints, and has good welding quality by changing a welding temperature field, reducing a solidification speed and reducing the size of columnar crystals due to the preheating effect of one side on the other side.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a thick plate narrow gap double-side swinging laser wire filling vertical welding method specifically comprises the following steps:
step one, groove design: processing double-side grooves at the welding parts of the two test pieces to be welded, and placing the two test pieces to be welded in a fixture;
step two, symmetrically arranging a laser head, a wire feeding nozzle and a shielding gas device at the groove positions on two sides, wherein the wire feeding nozzle is positioned above the laser head, the shielding gas device is positioned below the laser head, adjusting the angle between the laser head and the welding direction, adjusting the angle between the wire feeding nozzle and the welding direction, adjusting the angle between the shielding gas device and the welding direction, and adjusting the positions of the tip of a welding wire of a welding gun and a laser spot on a test piece to be welded;
step three, backing welding: laser heads at the double-side groove adopt a swinging mode to perform laser self-fluxing welding, backing welding parameters are set, the laser heads and shielding gas are started, and the laser at the two sides synchronously welds the roots of the double-side groove;
step four: filling and welding: adopting single-pass multilayer filling welding at the double-side groove, introducing shielding gas into both sides, setting filling welding parameters, starting a laser head and a wire feeding nozzle, synchronously feeding wires at both sides, and synchronously filling welding the double-side groove by lasers at both sides;
step five: cover surface welding: and setting cover surface welding parameters, starting a laser head and a wire feeding nozzle, synchronously feeding wires on two sides, and synchronously welding the cover surfaces of the grooves on the two sides by lasers on the two sides until the welding is finished.
Further, the thickness of the test piece to be welded is 40 mm-150 mm.
Furthermore, the grooves on the two sides are symmetrical grooves with truncated edges, each groove is of a U-shaped structure, the thickness of the truncated edge of each groove is 4-20 mm, the width of the root of each groove is 3-4.5 mm, the angle of each groove is 1-3 degrees, and the bottom of a test piece to be welded is perpendicular to the groove.
Furthermore, in the second step, the included angle between the laser head and the welding direction is 75-85 degrees, the included angle between the wire feeding nozzle and the welding direction is 30-60 degrees, the included angle between the shielding gas device and the welding direction is 100-150 degrees,
further, the backing welding parameters in the third step are as follows: the defocusing amount of the laser beam is +1mm to +10mm, the laser power is 3kW to 8kW, the swing track of the laser beam is perpendicular to the welding direction, the swing amplitude is 1mm to 3mm, the swing frequency is 40Hz to 200Hz, the welding speed is 0.3m/min to 0.6m/min, the shielding gas is high-purity argon, and the gas flow is 10L/min to 20L/min.
Further, the filling welding parameters in the fourth step are as follows: the defocusing amount of the laser beam is +1mm to +20mm, the laser power is 3kW to 6kW, the swing track of the laser beam is perpendicular to the welding direction, the swing amplitude is 1mm to 3mm, the swing frequency is 40Hz to 200Hz, the elongation of the welding wire is 5mm to 15mm, the wire feeding speed is 1m/min to 6m/min, and the welding speed is 0.3m/min to 0.8 m/min.
Further, the parameters of the cover surface welding in the fifth step are as follows: the defocusing amount of the laser beam is +1mm to +20mm, the laser power is increased by 200W to 400W compared with that of the laser in the fourth step, the swing track of the laser beam is vertical to the welding direction, the swing amplitude is increased by 0.2mm to 0.6mm compared with that of the swing amplitude in the fourth step, the swing frequency is 40Hz to 200Hz, the welding speed is 0.3m/min to 0.8m/min, the elongation of the welding wire is 5mm to 15mm, and the wire feeding speed is reduced by 1m/min to 2m/min compared with that of the wire feeding speed in the fourth step.
And furthermore, in the fourth step, the filling thickness of each layer of the filling welding is controlled to be 1-3 mm, after the filling welding is finished, mechanical cleaning or laser cleaning is carried out, and high-pressure air is used for blowing off smoke dust and welding slag covering the welding line and the groove.
Further, the height between the protective gas device and the surface to be welded is 15-20 mm, the distance between the front end of the protective gas device and the laser beam is 10-20 mm, and the flow rate of protective gas introduced into the protective gas device is 10L/min-20L/min.
Furthermore, the test piece to be welded is carbon steel, stainless steel, aluminum alloy, titanium alloy, magnesium alloy, copper alloy or nickel-based alloy, and the protective gas in the protective gas device is argon, nitrogen or helium or the mixture of the argon, the nitrogen and the helium in any ratio.
Compared with the prior art, the narrow-gap double-side-swinging laser wire-filling vertical welding method for the thick plate has the following advantages:
1. the invention relates to a thick plate bilateral swing laser wire filling vertical welding method, which is mainly characterized in that the amount of filling metal required in narrow-gap vertical welding is small, and the welding efficiency is high;
2. the invention adopts a double-side laser welding mode, has higher efficiency than single-side laser welding on the premise of ensuring the high quality of a welding joint, is easy to control the deformation caused by welding stress, and changes a welding temperature field, reduces the solidification speed and reduces the size of columnar crystals by the preheating effect of one side to the other side.
3. The invention adopts the laser beam swing mode for welding, compared with the weld pool, the plume and the fuse wire of the conventional laser welding, the stability of the capability is improved, and the laser beam swing is adopted under the laser deep fusion welding condition of forming the keyhole, thereby effectively controlling the defects of interlayer non-fusion and side wall non-fusion, and simultaneously stirring the weld pool, improving the weld surface formation, refining the crystal grains and improving the performance of the welding joint.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram illustrating a narrow-gap double-side-swing laser wire-filling vertical welding method for thick plates according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a bilaterally symmetrical groove structure;
fig. 3 is a schematic diagram of a bilateral asymmetric groove structure.
Description of reference numerals:
the device comprises a wire feeding nozzle I1, a wire feeding nozzle I2, a welding laser beam I3, a shielding gas device I4, a test piece to be welded, a wire feeding nozzle II 5, a welding laser beam II 6 and a shielding gas device II 7, wherein theta 1 is an included angle between the wire feeding nozzle and a welding direction, theta 2 is an included angle between the laser beam and the welding direction, and theta 3 is an included angle between the shielding gas device and the welding direction.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1: and (3) carrying out thick plate narrow gap bilateral swing laser wire filling vertical welding on a high-strength steel plate with the thickness of 120 mm.
Step one, groove design: a groove with a truncated edge is processed between the two test plates 4 to be welded, the thickness of the truncated edge is 5mm, the width of the root of the groove is 3mm, the angle of the groove is 2 degrees, the bottom of the test plate 4 to be welded is perpendicular to the groove, so that the clamping and fixing are convenient, the two test plates to be welded are placed in a fixture, the multi-point welding fixing is needed, and the cracking in the bottoming welding process is prevented;
step two, symmetrically arranging a laser head, a wire feeding nozzle and a shielding gas device at the groove positions on two sides, namely a laser head I2, a wire feeding nozzle I1, a shielding gas device 3, a laser head II 6, a wire feeding nozzle II 5 and a shielding gas device II 7, wherein the wire feeding nozzle is positioned above the corresponding laser head, the shielding gas device is positioned below the corresponding laser head, an included angle theta 2 between a laser beam emitted by the laser head and a welding direction is adjusted to be 75-85 degrees, an included angle theta 1 between the wire feeding nozzle and the welding direction is 30-60 degrees, an included angle theta 3 between the shielding gas device and the welding direction is 100-150 degrees, the height between the shielding gas device and a surface to be welded is 15-20 mm, and the distance between the front end of the shielding gas device and the laser beam is 10-20 mm;
step three, backing welding: the laser head at bilateral slope department adopts wobbling mode laser from melting welding, sets up the backing weld parameter, specifically does: the defocusing amount of the laser beam is +1mm, the laser power is 3kW, the swing track of the laser beam is perpendicular to the welding direction, the swing amplitude is 2mm, the swing frequency is 75Hz, the welding speed is 0.4m/min, and the laser on the two sides synchronously welds the roots of the grooves on the two sides;
step four: filling and welding: adopt single track multilayer filling welding in bilateral slope department, the protection gas is all let in to both sides, sets up filling welding parameter, specifically is: the defocusing amount of a laser beam is +20mm, the laser power is 3-4 kW, the swing track of the laser beam is perpendicular to the welding direction, the swing amplitude is 2-3 mm, the swing frequency is 75Hz, the elongation of a welding wire is 15mm, the wire feeding speed is 2m/min, the welding speed is 0.3m/min, a laser head and a wire feeding nozzle are started, wires are synchronously fed from two sides, and the grooves on the two sides are synchronously filled and welded by lasers on the two sides; controlling the filling thickness of each layer of filling welding to be 1-3 mm, and after the filling welding is finished, mechanically cleaning or laser cleaning, and blowing off smoke dust and welding slag covered in a welding line and a groove by using high-pressure air; (the laser power and the swing are different in thickness position parameters, specifically, for example, when the welding is performed at the position close to the top, the groove gap is larger, so the swing amplitude is increased, and the laser power is slightly increased;
step five: cover surface welding: setting cover surface welding parameters, wherein the defocusing amount of a laser beam is +20mm, the laser power is increased by 400W compared with the laser power in the fourth step, the swing track of the laser beam is vertical to the welding direction, the swing amplitude is increased by 0.6mm compared with the swing amplitude in the fourth step, the swing frequency is 75Hz, the welding speed is 0.6m/min, the elongation of a welding wire is 5mm, the wire feeding speed is 1m/min, starting a laser head and a wire feeding nozzle, synchronously feeding wires from two sides, synchronously welding the cover surfaces of grooves on the two sides by lasers on the two sides until the welding is finished, and basically keeping the shrinkage of the grooves on the two sides of the welded thick plate consistent; and the columnar crystal has small size and good welding quality.
And in the third step and the fifth step, protective gas is introduced through a protective gas device, the flow of the introduced protective gas is 15L/min, the protective gas in the protective gas device is argon, nitrogen and helium or the mixture of the argon, the nitrogen and the helium in any ratio, and the test piece to be welded is carbon steel, stainless steel, aluminum alloy, titanium alloy, magnesium alloy, copper alloy or nickel-based alloy.
And in the third step, the step five, the double-side synchronous welding can be changed into a welding mode that one side is welded in front by laser, the other side is welded in back by laser, and the difference of the laser spot heights of the two sides is 20 mm.
Example 2: carrying out narrow-gap one-side swing laser wire-filling vertical welding on a high-strength steel plate with the thickness of 120mm, wherein a groove is the same as that of the double-side swing laser wire-filling vertical welding, the welding parameters are set to be the same, the single side is compared with the double sides, the groove shrinks after the single-side welding, the width of the gap at the top of the groove needs to be noticed, and the larger side of the gap at the top of the groove is welded; and the shrinkage of the grooves on two sides of the double-side welding is basically consistent.
Example 3, for some special structural form large structural parts, such as thick-wall circular rings, arc plates and the like, welding can be carried out by adopting an asymmetric groove form. And (3) performing thick-plate narrow-gap bilateral swing laser wire-filling vertical welding on a high-strength steel plate with the thickness of 100 mm.
Step one, groove design: a groove with a truncated edge is processed between two test plates 4 to be welded, the thickness of the truncated edge is 6mm, the angle of the groove is 2 degrees, the gap between roots is 3mm, the thickness of one side is 60mm, the thickness of one side is 34mm, the bottoms of the test plates to be welded are perpendicular to the groove, so that the test plates are convenient to clamp and fix, two test pieces to be welded are placed in a clamp, multiple spot welding is needed to fix, and cracking in the bottoming welding process is prevented;
step two, symmetrically arranging a laser head, a wire feeding nozzle and a shielding gas device at the groove at two sides, wherein the wire feeding nozzle is positioned above the corresponding laser head, the shielding gas device is positioned below the corresponding laser head, adjusting the included angle between a laser beam emitted by the laser head and the welding direction to be 75-85 degrees, adjusting the included angle between the wire feeding nozzle and the welding direction to be 30-60 degrees, adjusting the included angle between the shielding gas device and the welding direction to be 100-150 degrees, adjusting the height between the shielding gas device and the surface to be welded to be 15-20 mm, and adjusting the distance between the front end of the shielding gas device and the laser beam to be 10-20 mm;
step three, backing welding: the laser head at bilateral slope department adopts wobbling mode laser from melting welding, sets up the backing weld parameter, specifically does: the defocusing amount of the laser beam is +1mm, the laser power is 3kW, the swing track of the laser beam is perpendicular to the welding direction, the swing amplitude is 2mm, the swing frequency is 75Hz, and the welding speed is 0.4 m/min;
step four: filling and welding: adopt single track multilayer filling welding in bilateral slope department, the protection gas is all let in to both sides, sets up filling welding parameter, specifically is: the defocusing amount of a laser beam is +20mm, the laser power is 3-4 kW, the swing track of the laser beam is perpendicular to the welding direction, the swing amplitude is 2-3 mm, the swing frequency is 75Hz, the elongation of a welding wire is 15mm, the wire feeding speed is 2m/min, the welding speed is 0.3m/min, a laser head and a wire feeding nozzle are started, wires are synchronously fed from two sides, and the grooves on the two sides are synchronously filled and welded by lasers on the two sides; the laser acts on a test piece to be welded to form a welding molten pool, then a welding wire extends into the molten pool, the filling thickness of each layer of filling welding is controlled to be 1-3 mm, mechanical cleaning or laser cleaning is carried out after the filling welding is finished, and high-pressure air is used for blowing away smoke dust and welding slag covering in a welding seam and a groove;
step five: cover surface welding: setting cover surface welding parameters, wherein the defocusing amount of a laser beam is +20mm, the laser power is increased by 400W compared with the laser power in the fourth step, the swing track of the laser beam is perpendicular to the welding direction, the swing amplitude is increased by 0.6mm compared with the swing amplitude in the fourth step, the swing frequency is 75Hz, the welding speed is 0.6m/min, the elongation of a welding wire is 5mm, the wire feeding speed is 1m/min, starting a laser head and a wire feeding nozzle, synchronously feeding wires from two sides, and synchronously welding the cover surfaces of grooves on the two sides by lasers on the two sides until the two sides are welded.
And (4) introducing protective gas through a protective gas device in the third step to the fifth step, wherein the flow of the introduced protective gas is 10L/min-20L/min.
According to the invention, a narrow-gap bilateral-swinging laser wire-filling vertical upward welding method is adopted, firstly, the amount of metal to be filled in narrow-gap welding is small, and the welding efficiency is improved; secondly, a deep fusion welding mode for forming a keyhole is adopted to ensure good interlayer fusion; then, the laser beam swing can increase the fusion width and improve the fusion condition of the side wall; meanwhile, the laser beam swing has the advantages of stirring the molten pool, reducing air holes, improving weld forming, refining grains and the like; and finally, the welding efficiency is improved by bilateral welding, the deformation problem caused by welding stress is favorably controlled, meanwhile, one side has a certain preheating effect on the other side, the welding temperature field is changed, the solidification speed is reduced, the size of the columnar crystal is reduced, and the welding quality is good.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A thick plate narrow gap double-side swinging laser wire filling vertical welding method is characterized in that: the method specifically comprises the following steps:
step one, groove design: processing double-side grooves at the welding parts of the two test pieces to be welded, and placing the two test pieces to be welded in a fixture;
step two, symmetrically arranging a laser head, a wire feeding nozzle and a shielding gas device at the groove positions on two sides, wherein the wire feeding nozzle is positioned above the laser head, the shielding gas device is positioned below the laser head, adjusting the angle between the laser head and the welding direction, adjusting the angle between the wire feeding nozzle and the welding direction, adjusting the angle between the shielding gas device and the welding direction, and adjusting the positions of the tip of a welding wire of a welding gun and a laser spot on a test piece to be welded; in the second step, an included angle between the laser head and the welding direction is 75-85 degrees, an included angle between the wire feeding nozzle and the welding direction is 30-60 degrees, an included angle between the shielding gas device and the welding direction is 100-150 degrees, and the tip of a welding wire of the welding gun is tangent to a laser spot on a test piece to be welded;
step three, backing welding: laser heads at the double-side groove adopt a swinging mode to perform laser self-fluxing welding, backing welding parameters are set, the laser heads and shielding gas are started, and the laser at the two sides synchronously welds the roots of the double-side groove;
step four: filling and welding: adopting single-pass multilayer filling welding at the double-side groove, introducing shielding gas into both sides, setting filling welding parameters, starting a laser head and a wire feeding nozzle, synchronously feeding wires at both sides, and synchronously filling welding the double-side groove by lasers at both sides;
step five: cover surface welding: setting cover surface welding parameters, starting a laser head and a wire feeding nozzle, synchronously feeding wires on two sides, and synchronously welding the cover surfaces of grooves on two sides by lasers on two sides until the welding is finished;
the double-side grooves are bilaterally symmetrical grooves with truncated edges, each groove is of a U-shaped structure, the thickness of the truncated edge of each groove is 5mm, the width of the root of each groove is 3mm, the angle of each groove is 2 degrees, and the bottom of a test piece to be welded is perpendicular to the groove; or an asymmetric groove form is adopted;
the thickness of the test piece to be welded is 120 mm;
the backing welding parameters are as follows: the defocusing amount of the laser beam is +1mm, the laser power is 3kW, the swing track of the laser beam is perpendicular to the welding direction, the swing amplitude is 2mm, the swing frequency is 75Hz, and the welding speed is 0.4 m/min;
the filling welding parameters are as follows: the defocusing amount of a laser beam is +20mm, the laser power is 3-4 kW, the swing track of the laser beam is perpendicular to the welding direction, the swing amplitude is 2-3 mm, the swing frequency is 75Hz, the elongation of a welding wire is 15mm, the wire feeding speed is 2m/min, and the welding speed is 0.3 m/min;
the parameters of cover welding are as follows: the defocusing amount of the laser beam is +20mm, the laser power is increased by 400W compared with the laser power in the fourth step, the swing track of the laser beam is vertical to the welding direction, the swing amplitude is increased by 0.6mm compared with the swing amplitude in the fourth step, the swing frequency is 75Hz, the welding speed is 0.6m/min, the elongation of the welding wire is 5mm, and the wire feeding speed is 1 m/min;
the double-side laser welding mode is easy to control deformation caused by welding stress, and one side of the double-side laser welding mode has a preheating effect on the other side, so that a welding temperature field is changed, the solidification speed is reduced, and the size of columnar crystals is reduced.
2. The narrow-gap double-side-swinging laser wire-filling vertical welding method for the thick plate according to claim 1, characterized in that: and in the fourth step, the filling thickness of each layer of the filling welding is controlled to be 1-3 mm, after the filling welding is finished, mechanical cleaning or laser cleaning is carried out, and high-pressure air is used for blowing off smoke dust and welding slag covering the welding line and the groove.
3. The narrow-gap double-side-swinging laser wire-filling vertical welding method for the thick plate according to claim 1, characterized in that: the height between the protective gas device and the surface to be welded is 15-20 mm, the distance between the front end of the protective gas device and the laser beam is 10-20 mm, and the flow rate of protective gas introduced into the protective gas device is 10-20L/min.
4. The narrow-gap double-side-swinging laser wire-filling vertical welding method for the thick plate according to claim 1, characterized in that: the test piece to be welded is carbon steel, stainless steel, aluminum alloy, titanium alloy, magnesium alloy, copper alloy or nickel-based alloy, and the protective gas in the protective gas device is argon, nitrogen, helium or a mixture of the argon, the nitrogen and the helium in any ratio.
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| CN103008895B (en) * | 2012-12-15 | 2015-04-15 | 华中科技大学 | Narrow gap multi-pass laser welding method for thick plate |
| CN103192168B (en) * | 2013-04-17 | 2015-03-04 | 二重集团（德阳）重型装备股份有限公司 | Vertical symmetrical welding method for wide and thick plates |
| CN103286449B (en) * | 2013-05-07 | 2015-07-01 | 中国科学院等离子体物理研究所 | Narrow gap laser hot-wire-filling welding process for 316LN thick plate |
| CN104384717B (en) * | 2014-11-12 | 2016-04-13 | 中国船舶重工集团公司第七二五研究所 | Swing laser-heated filament the welding method of butt welding is implemented in the narrow gap of a kind of slab |
| CN206474820U (en) * | 2017-02-14 | 2017-09-08 | 上海振华重工(集团)股份有限公司 | The narrow gap welding groove of sheet material |
| CN110076430B (en) * | 2019-05-24 | 2021-07-13 | 武汉钢铁有限公司 | Gas shielded welding method for 1000MPa steel plate with thickness of more than or equal to 40mm |
| CN112108766B (en) * | 2019-06-21 | 2022-08-23 | 南京航空航天大学 | Device for reducing air hole defects of double-laser-beam bilateral synchronous welding joint of T-shaped structure |
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