CN116140809A - Method for online adjustment of phase proportion of duplex stainless steel welding - Google Patents

Method for online adjustment of phase proportion of duplex stainless steel welding Download PDF

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Publication number
CN116140809A
CN116140809A CN202310347589.1A CN202310347589A CN116140809A CN 116140809 A CN116140809 A CN 116140809A CN 202310347589 A CN202310347589 A CN 202310347589A CN 116140809 A CN116140809 A CN 116140809A
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welding
workpiece
stainless steel
duplex stainless
laser
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张群莉
宣翰庭
姚建华
陈智君
王梁
郑亚风
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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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
    • B23K26/346—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding
    • B23K26/348—Working by laser beam, e.g. welding, cutting or boring in combination with welding or cutting covered by groups B23K5/00 - B23K25/00, e.g. in combination with resistance welding in combination with arc heating, e.g. TIG [tungsten inert gas], MIG [metal inert gas] or plasma welding
    • 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
    • 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
    • B23K26/70—Auxiliary operations or equipment
    • B23K26/702—Auxiliary equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention discloses a method for online adjustment of phase proportion of duplex stainless steel welding, which comprises the following steps: step 1, preprocessing a workpiece, wherein the workpiece is made of a duplex stainless steel material; step 2, performing arc laser composite welding on the workpiece through an arc welding gun and a laser; step 3, after welding is completed, carrying out electromagnetic induction heat treatment on the workpiece through an induction coil; and 4, cooling the workpiece, promoting austenite transformation, controlling the proportion of two phases, and completing the adjustment of the proportion. The method has high production efficiency, good weld joint forming of the welded joint after welding, low requirement on assembly precision, balanced two-phase proportion and no precipitation of harmful phases, so that the welded joint has excellent corrosion resistance and mechanical property.

Description

Method for online adjustment of phase proportion of duplex stainless steel welding
Technical Field
The invention relates to the field of duplex stainless steel welding, in particular to a method for online adjustment of phase proportion in duplex stainless steel welding.
Background
The duplex stainless steel is composed of ferrite phase and austenite phase in equal proportion, has excellent toughness of the austenite stainless steel and high strength of the ferrite stainless steel, and is widely applied in the fields of petrochemical industry, ocean engineering and the like. Welding is one of the main processing methods of duplex stainless steel, austenite is transformed into ferrite due to higher heat input in the welding process, the ferrite is not transformed into austenite due to the rapid cooling speed after the welding is finished, a large amount of elements are gathered in the ferrite, and harmful phases such as nitrides and carbides are separated out to influence the mechanical property and corrosion resistance of the duplex stainless steel.
The invention patent number CN113909688A discloses a duplex stainless steel welding method and a welding system for adjusting the ratio of two phases, alternating magnetic fields are applied to a workpiece to be welded of the duplex stainless steel through magnetic field equipment, the workpiece to be welded is subjected to laser welding under the action of the alternating magnetic fields, and the loaded alternating magnetic fields have a certain stirring effect on a welding molten pool, so that the flow of the molten pool is more stable, and the adjustment of the ratio of two phases is realized. Although the above patent document can realize the two-phase proportion adjustment of the workpiece to be welded of the duplex stainless steel, the problem of harmful precipitated phases generated by high heat input and cooling speed after the welding is completed is not considered.
The invention patent No. CN101733523A discloses a double-phase stainless steel welding process for a medium plate, wherein a part to be welded is processed into a double U-shaped groove, the double-phase groove is assembled in a butt joint mode, multi-layer multi-pass welding is adopted, after the welding is finished, a heat treatment furnace is used for carrying out solution treatment for 30min, no harmful phase is generated in a joint, and a relatively uniform welding joint with a comparative example is obtained. The above patent uses a heat treatment furnace to perform post-weld heat treatment of the welded joint, the process needs to be kept warm for a long time, the welding efficiency is reduced, and the heat treatment weldment is limited by the size of the heat treatment furnace.
In summary, in the conventional rapid welding technology such as laser welding, the weld zone cannot avoid the generation of harmful precipitated phases, and the phase ratio after welding is unbalanced, so that the austenite content is low. The welding process has insufficient heat and rapid cooling speed, so that harmful phases such as carbide, nitride and the like are easy to separate out in the welding area, and the unbalance of the welding area is serious in comparison with the welding area. The solution treatment efficiency of the heat treatment furnace is low, and large complex parts cannot be treated, so the applicant proposes a method for online adjustment of the phase proportion of the duplex stainless steel welding.
Disclosure of Invention
The invention aims to solve the problems of unbalanced phase proportion, precipitation of harmful phase and low post-welding heat treatment efficiency of the existing duplex stainless steel after welding, and provides a method for online adjustment of the phase proportion of the duplex stainless steel after welding.
The invention realizes the above purpose through the following technical scheme:
the online phase proportion adjusting method for the duplex stainless steel welding specifically comprises the following steps:
step 1, preprocessing a workpiece, wherein the workpiece is made of a duplex stainless steel material;
step 2, performing arc laser composite welding on the workpiece through an arc welding gun and a laser;
step 3, after welding is completed, carrying out electromagnetic induction heat treatment on the workpiece through an induction coil;
and 4, cooling the workpiece, promoting austenite transformation, controlling the proportion of two phases, and completing the adjustment of the proportion.
Further, in the method, the workpiece is clamped on the welding fixture, the welding fixture is driven to move by the moving mechanism, so that the relative movement of the workpiece, the laser, the arc welding gun and the induction coil is realized, the moving mechanism is preferably a triaxial moving machine tool, and the moving speed is adjustable.
Further, the welding fixture is provided with a vent hole, the vent pipe is used for connecting the nitrogen bottle and the welding fixture, nitrogen is introduced into the welding fixture, the flow rate of the nitrogen is 5-25L/min, the bottom of the workpiece is protected from being oxidized, and the formation of austenite at the bottom of the workpiece is promoted. Specifically, welding jig includes welding jig bottom plate and two welding jig top plates, and welding jig top plate passes through fixing bolt to be connected, and the work piece presss from both sides tightly between welding jig bottom plate and welding jig top plate. The center line of the bottom plate of the welding fixture is grooved and non-communicated, and the two ends of the bottom plate are provided with front and rear through holes which are connected with a nitrogen vent pipe, so that nitrogen is conveniently introduced into the bottom of a workpiece, the bottom of a welding seam is prevented from being oxidized, the austenitic proportion of the bottom of the welding seam is improved, and the welding seam is attractive in appearance.
Further, the pretreatment in the step 1 comprises the steps of removing burrs on the surface of a workpiece and cleaning and degreasing, and specifically comprises the following steps: and (3) mechanically polishing the surface of the workpiece, removing the influence factors such as burrs, greasy dirt and the like, and then dipping the non-woven fabric in absolute ethyl alcohol to clean the surface of the workpiece.
Furthermore, the invention adopts the laser-arc composite welding platform to weld the workpiece, and the laser-arc composite welding platform comprises a laser, an arc welding gun, a welding clamp and other structures. The laser is an optical fiber laser, the whole arc welding gun is a wire feeding MIG welding machine, the laser spots are round, and the used shielding gas is argon and nitrogen mixed gas.
In step 2, when arc laser hybrid welding is performed, the duplex stainless steel flat plates are butted by adopting the I-shaped groove, no gap is reserved between the grooves of the flat plates during butt joint, an arc welding gun is in front, a high-temperature molten pool is formed at a welding joint to improve the laser absorptivity, and the molten pool is heated for the second time after the laser beam is used for enabling the formed welding seam to be full and smooth. And in the step 2, welding parameters including laser power, arc wire feeding speed, wire spacing, laser defocusing amount, arc protection air flow and workpiece bottom protection air flow are set, and the welding speed is realized by setting the moving speed of a moving mechanism.
Further, in the step 2, specific welding process parameters are as follows: the distance between the optical wires is 0-10 mm, the laser power is 5-20 kW, the electric arc wire feeding speed is 2-20 m/min, and the electric arc protection gas is Ar+N 2 The flow is 15-25L/min, and the moving speed of the workpiece relative to the arc welding gun and the laser is 0.01-5 m/min.
Further, the welding completion in the step 2 is defined as: and the whole workpiece is welded, the workpiece is moved out of the laser arc composite welding platform, and gas in the welding fixture is continuously introduced and does not stop along with the completion of welding.
Further, the induction heat treatment in the step 3 uses an electromagnetic induction heat treatment platform, and the electromagnetic induction heat treatment platform comprises an induction heating magnetizer, an induction coil, an infrared temperature measuring device, a water cooling device and an air blowing device. And setting induction heat treatment process parameters in the step 3, wherein the induction heat treatment process parameters comprise induction frequency, induction heating temperature, the height of an induction head from the surface of a workpiece, the moving speed of a moving mechanism, the water spraying flow of a water cooling device and the gas flow of a blowing device.
Further, the electromagnetic induction heat treatment in the step 3 includes: and (3) maintaining the induction coil above the weld joint to be treated for heat treatment, wherein the width of a magnetizer of the induction coil is equal to that of the weld joint, heating the welding joint to be above the austenitizing temperature, blowing air to the workpiece through an air blowing device, and enabling nitrogen blown by the air blowing device to promote the austenitic growth of the welding joint in the induction process, and measuring the surface temperature of the workpiece in real time through an infrared temperature measuring device, so that the workpiece moves forwards relative to the induction coil.
Further, in the step 3, the moving speed of the workpiece relative to the induction coil is changed to 0.03-1 m/min when electromagnetic induction heat treatment is performed, the workpiece is blown to the lower part of the induction coil when the blowing device blows, the nitrogen flow is 10-30L/min, the induction frequency of the induction coil is 10-30 kHZ, the height of the induction coil from the surface of the welding seam is 3-15 mm, and the induction heating temperature is 500-1300 ℃.
In step 4, the workpiece is naturally cooled, austenite continuously grows in the slow cooling process, when the temperature of the workpiece is naturally cooled to 650-700 ℃, a water cooling device is started to water-cool the welding workpiece, preferably to 700 ℃, a water curtain flows onto the welding sample to be rapidly cooled to room temperature, water stains on the surface of the welding workpiece are blown off by an air blowing device, and the rapid cooling process prevents the welding joint from precipitating harmful phases.
The air blowing device is synchronously started and continues to step 4 when the induction heat treatment is started, air flow is located above the welding joint below the induction coil, firstly the air can promote austenite growth in the welding joint in the induction heat treatment process, secondly the induction heating cooling rate can be changed by controlling the air flow, and finally the air blowing can blow off water stains flowing on the welding joint, so that the water curtain is prevented from flowing below the induction coil, and the induction heating effect is affected.
Further, after finishing the post-treatment in the step 4, namely water-cooling to room temperature, wherein no residual water stain exists on the surface of the welding piece, closing induction, closing the induction blowing device and the water cooling device, stopping introducing gas into the welding fixture, and finishing the online phase proportion adjustment of the duplex stainless steel welding.
The working principle of the invention is as follows:
the arc guides laser welding, the arc drops into a welding joint below before the arc drops to form a high-temperature molten pool, the laser absorptivity is improved, the laser enters the molten pool formed by the arc after the laser enters the arc, a laser keyhole is deepened, thick plate welding is facilitated, meanwhile, the laser heats the molten pool again, the surface of a welding seam is plump and smooth, and the welding joint with good macroscopic appearance is obtained. And then carrying out post-welding induction heat treatment, wherein the width of the induction coil magnetizer is consistent with that of the welding seam, so that heat is mainly concentrated at the welding seam part, the welding seam is quickly heated to be higher than the austenite transformation temperature, ferrite elements start to diffuse, austenite is continuously separated out in the slow cooling process, gas sprayed by an air blowing device is simultaneously induced to be favorable for separating out the austenite, water cooling is started below 700 ℃, a welding joint is quickly cooled to room temperature, the austenite stops growing, a two-phase structure is balanced, and a welding seam area has no harmful phase.
The invention has the beneficial effects that:
1) The welding platform adopts laser arc composite welding, a molten pool formed before an arc can make up assembly errors, the welding seam is attractive in appearance, the laser pinhole effect is facilitated, the welding penetration is increased, and the welding stability is improved;
2) The induction heating platform heats the welding joint part by using the induction heating coil, so that the energy waste of the whole heating of the heat treatment furnace is avoided by local heating, the production efficiency is greatly improved, the flexibility of an induction heating path is adjustable, and large-scale complex parts can be treated;
3) The induction heating welding joint has extremely fast heating rate, the austenite transformation point is reached rapidly, austenite is continuously precipitated in the cooling process of the welding joint, the two-phase structure is improved, and Cr is prevented from being generated by controlling a cooling interval 2 N、M 23 C 6 AlN harmful phase and induction heatThe gas introduced in the treatment process can promote the growth of austenite, improve the proportion of austenite, prevent the austenite from continuously growing by water cooling, and avoid the overhigh proportion of austenite;
4) The method has high production efficiency, good weld joint forming of the welded joint after welding, low requirement on assembly precision, balanced two-phase proportion and no precipitation of harmful phases, so that the welded joint has excellent corrosion resistance and mechanical property.
Drawings
FIG. 1 is a schematic flow chart of the method for online adjustment of phase proportions for duplex stainless steel welding of the present invention;
FIG. 2 is a schematic view of a laser arc hybrid welding platform structure according to the present invention;
FIG. 3 is a schematic structural view of an electromagnetic induction heat treatment platform according to the present invention;
FIG. 4 is a schematic illustration of the induction heat treated welded joint process of the present invention;
FIG. 5 is a schematic view of a weld fixture floor vent of the present invention;
FIG. 6 is a scanning electron microscope image of a duplex stainless steel weld joint structure without employing the method of the present invention, FIG. 6 (a) being a weld zone microstructure and FIG. 6 (b) being a fusion zone microstructure;
FIG. 7 is a scanning electron microscope image of the structure of a duplex stainless steel welded joint of example 1 using the method of the present invention, where (a) of FIG. 7 is the microstructure of the weld zone and (b) of FIG. 7 is the microstructure of the weld zone;
FIG. 8 is a scanning electron microscope image of the structure of a duplex stainless steel welded joint of example 2 using the method of the present invention, where (a) of FIG. 8 is the microstructure of the weld zone and (b) of FIG. 8 is the microstructure of the weld zone.
In the figure:
1-a laser;
2-a laser beam;
3-arc welding gun;
4-arc welding wire;
5-a workpiece;
6-welding an upper pressing plate of the clamp;
7-fixing bolts;
8-welding a clamp bottom plate;
9-a moving mechanism;
10-vent holes;
11-an infrared temperature measuring device;
12-blowing device;
13-a water cooling device;
14-an induction coil;
15-induction heating of the magnetizer;
16-heat treating the weld joint to be induced;
17-welding jig floor slots.
Description of the embodiments
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1-5, a method for online adjustment of phase ratio for duplex stainless steel welding includes the following steps:
step 1, pretreating a workpiece 5, wherein the workpiece 5 is made of a duplex stainless steel material, and specifically comprises the following steps:
the surface of the workpiece 5 is mechanically polished, the influence factors such as burrs and oil stains are removed, then the surface of the workpiece 5 is cleaned by dipping absolute ethyl alcohol in non-woven fabrics, then the workpiece 5 is clamped on a welding fixture, and the welding fixture is driven to move by a moving mechanism 9, so that the relative movement of the workpiece 5, the laser 1, the arc welding gun 3 and the induction coil 14 is realized, the moving mechanism 9 is preferably a triaxial moving machine tool, and the moving speed is adjustable.
With continued reference to fig. 5, the welding fixture has a vent hole 10, and the vent pipe is used to connect the nitrogen bottle with the welding fixture, and nitrogen is introduced into the vent hole 10 of the welding fixture, wherein the flow rate of the nitrogen is 5-25L/min, so as to protect the bottom of the workpiece 5 from oxidation and promote the formation of austenite at the bottom of the workpiece 5.
Specifically, as shown in fig. 2, the welding jig 5 includes a welding jig base plate and two welding jig upper plates, the welding jig upper plates are connected by fixing bolts 7, and the workpiece 5 is clamped between the welding jig base plate 8 and the welding jig upper plates 6. The center line of the bottom plate 8 of the welding fixture is grooved and non-conductive, and the two ends of the bottom plate are provided with front and rear through holes for connecting nitrogen vent pipes, so that nitrogen can be conveniently introduced into the bottom of the workpiece 5, oxidation of the bottom of a welding seam is prevented, the austenite proportion of the bottom of the welding seam is improved, and the welding seam is attractive in appearance.
And 2, performing arc laser hybrid welding on the workpiece through an arc welding gun and a laser.
As shown in fig. 2, a laser-arc hybrid welding platform is used for welding a workpiece 5, and the laser-arc hybrid welding platform comprises a laser 1, an arc welding gun 3, a welding fixture and other structures. The laser 1 is an optical fiber laser, the whole arc welding gun is a wire feeding MIG welding machine, the laser spots are round, and the used shielding gas is argon and nitrogen mixed gas.
The welding parameters comprise laser power, arc wire feeding speed, optical wire distance, laser defocusing amount, arc protection air flow and workpiece bottom protection air flow, and the welding speed is realized by setting the moving speed of the moving mechanism 9. The specific technological parameters of welding are as follows: the distance between the optical wires is 0-10 mm, the laser power is 5-20 kW, the electric arc wire feeding speed is 2-20 m/min, and the electric arc protection gas is Ar+N 2 The flow rate is 15-25L/min, and the moving speed of the workpiece 5 relative to the arc welding gun 3 and the laser 1 is 0.01-5 m/min.
When arc laser composite welding is carried out, the duplex stainless steel flat plates are butted by adopting an I-shaped groove, no gap is reserved between the grooves between the flat plates during butt joint, the arc welding gun 3 is in front, a high-temperature molten pool is formed at the welding joint to improve the laser absorptivity, and the laser beam is in rear, and the molten pool is heated for the second time, so that the formed welding seam is full and smooth.
Wherein, welding completion is defined as: and the whole workpiece 5 is welded, the laser arc composite welding platform is moved out, and the gas in the welding fixture is continuously introduced and does not stop along with the completion of welding.
And 3, after welding, carrying out electromagnetic induction heat treatment on the workpiece through an induction coil.
As shown in fig. 3 and 4, the induction heat treatment uses an electromagnetic induction heat treatment platform, which includes an induction heating magnetizer 15, an induction coil 14, an infrared temperature measuring device 11, a water cooling device 13 and an air blowing device 12. In the step 3, induction heat treatment process parameters are set, including induction frequency, induction heating temperature, height of the induction head from the surface of the workpiece 5, moving speed of the moving mechanism 9, water spraying flow of the water cooling device 13 and gas flow of the blowing device 12.
Wherein, electromagnetic induction heat treatment includes: the induction coil 14 is kept above the weld joint to be processed for heat treatment, the width of a magnetizer of the induction coil 14 is equal to that of the weld joint, the weld joint is heated to be above the austenitizing temperature, the workpiece 5 is blown by the blowing device 12, nitrogen blown by the blowing device 12 promotes the austenitic growth of the weld joint in the induction process, the surface temperature of the workpiece 5 is measured in real time by the infrared temperature measuring device 11, and the workpiece 5 moves forwards relative to the induction coil 14.
Wherein the moving speed of the workpiece 5 relative to the induction coil 14 is changed to 0.03-1 m/min when electromagnetic induction heat treatment is carried out, the workpiece is blown to the lower part of the induction coil 14 when the blowing device 14 blows, the nitrogen flow is 10-30L/min, the induction frequency of the induction coil 14 is 10-30 kHZ, the height of the induction coil 14 from the surface of a welding seam is 3-15 mm, and the induction heating temperature is 500-1300 ℃.
And 4, cooling the workpiece, promoting austenite transformation, controlling the proportion of two phases, and completing the adjustment of the proportion.
Wherein, let work piece natural cooling earlier, austenite continuously grows in the slow cooling process, when work piece temperature natural cooling reaches 650 ~ 700 ℃, start water cooling plant 13 and carry out the water-cooling to the welding piece, the water curtain flows and cools off to room temperature fast on the welding sample, blows off the welding piece surface water stain through blowing device 12, and the quick cooling process prevents that the welded joint from separating out harmful phase.
The air blowing device is synchronously started and continues to step 4 when the induction heat treatment is started, air flows are located on the welding joint below the induction coil, firstly, the air can promote the austenite growth in the welding joint in the induction heat treatment process, secondly, the induction heating cooling rate can be changed by controlling the air flow, and finally, the air blowing can blow off water stains flowing on the welding joint, so that the water curtain is prevented from flowing below the induction coil, and the induction heating effect is affected.
The post-treatment is completed, namely water cooling is carried out to room temperature, no residual water stain exists on the surface of the welding piece, induction is closed, the induction blowing device and the water cooling device are closed, the welding fixture stops introducing gas, and the online phase proportion adjustment of the duplex stainless steel welding is completed.
Example 1
Referring to fig. 2-5, a method for online adjustment of phase ratio of duplex stainless steel welding comprises the following working processes:
(1) Polishing and deburring a workpiece 5, namely an 8mm thick duplex stainless steel workpiece flat plate, removing surface stains by absolute ethyl alcohol, clamping the workpiece on a welding fixture after the treatment is finished, placing the workpiece on a moving mechanism 9 after the clamping is finished, and introducing nitrogen into a vent hole 10, wherein the flow is 10L/min.
(2) The workpiece 5 moves to the lower part of the arc welding wire 4, the laser power 5500W is set, the arc wire feeding speed is 6m/min, the moving speed of the moving mechanism 9, namely the welding speed, is 1.2m/min, the distance between a light spot and the welding wire is 3mm, the laser defocusing amount is 0mm, the light spot diameter is 2mm, the arc protection gas is nitrogen with the argon mixed 3% volume fraction, the flow is 20L/min, the welding direction is that the arc welding gun 3 is in front, and the laser 1 starts welding after.
(3) After welding, the moving mechanism 9 continues to move forwards to the electromagnetic induction heat treatment platform, the moving speed of the moving mechanism 9 is changed to be 0.06m/min, the electromagnetic induction frequency is set to be 10kHZ, the height of the induction heating magnetizer 15 from the welding seam 16 to be subjected to induction heat treatment is 3mm, the air blowing device 12 is started, the nitrogen flow is set to be 20L/min, the induction heating maximum temperature is 1050 ℃, the infrared temperature measuring device 11 monitors the surface temperature of the welding seam, the water cooling device 13 is started to cool the welding surface, the water stain on the surface of a welding piece is blown out by the air flow of the air blowing device 12, and the tissue regulation and control are completed after the room temperature is continued. As can be seen from fig. 7, the two phases of the weld zone are uniformly proportioned, austenite is uniformly distributed on ferrite, the proportion of austenite in the fusion zone is increased compared with that before heat treatment, no harmful phase is separated out, and pit erosion caused by the harmful phase disappears.
Example 2
As shown in fig. 2 to 5, a method for online adjustment of phase proportion in duplex stainless steel welding comprises the following working processes:
(1) Polishing and deburring a workpiece 5, namely a dual-phase stainless steel workpiece flat plate with the thickness of 10mm, removing surface stains by absolute ethyl alcohol, clamping the workpiece on a welding fixture after the treatment is finished, placing the workpiece on a moving mechanism 9 after the clamping is finished, and introducing nitrogen into a vent hole 10, wherein the flow is 15L/min.
(2) The workpiece 5 moves to the lower part of the arc welding wire 4, the laser power is 8000W, the arc wire feeding speed is 12m/min, the moving speed of the moving mechanism 9, namely the welding speed is 2.5m/min, the distance between a light spot and the welding wire is 6mm, the defocusing amount of laser is 0mm, the diameter of the light spot is 2mm, the arc protection gas is nitrogen with the volume fraction of 5% of argon, the flow is 20L/min, the welding direction is that the arc welding gun 3 is in front, and the laser 1 starts to weld after.
(3) After welding is finished, the moving mechanism 9 continues to move forwards to an electromagnetic induction heating platform, the moving speed of the moving mechanism 9 is changed to be 0.03m/min, electromagnetic induction frequency is set to be 24kHZ, the height of an induction heating magnetizer 15 from a welding line 16 to be subjected to induction heat treatment is 6mm, a blowing device 12 is started, the nitrogen flow is set to be 20L/min, the induction heating maximum temperature is 1150 ℃, an infrared temperature measuring device 11 monitors the surface temperature of the welding line, a water cooling device 13 is started to enable the welding surface to be water-cooled, the water stain on the surface of a welding piece is blown off by air flow of the blowing device 12, and tissue regulation and control are finished after the welding is continued to room temperature. As can be seen from FIG. 8, the weld zone has a uniform two-phase ratio, austenite is uniformly distributed on ferrite, the ratio of austenite in the fusion zone is increased as compared with that before heat treatment, no harmful phase is separated out, cr 2 N、M 23 C 6 Pit formation by AlN deleterious phase is eliminated.
The above embodiments are only preferred embodiments of the present invention, and are not limiting to the technical solutions of the present invention, and any technical solution that can be implemented on the basis of the above embodiments without inventive effort should be considered as falling within the scope of protection of the patent claims of the present invention.

Claims (9)

1. A method for online adjustment of phase proportions for duplex stainless steel welding, which is characterized by comprising the following steps:
step 1, preprocessing a workpiece, wherein the workpiece is made of a duplex stainless steel material;
step 2, performing arc laser composite welding on the workpiece through an arc welding gun and a laser;
step 3, after welding is completed, carrying out electromagnetic induction heat treatment on the workpiece through an induction coil;
and 4, cooling the workpiece, promoting austenite transformation, controlling the proportion of two phases, and completing the adjustment of the proportion.
2. The method for online adjustment of phase ratio for duplex stainless steel welding according to claim 1, wherein in the method, the workpiece is clamped on a welding fixture, and the welding fixture is driven to move by a moving mechanism, so that the workpiece and a laser, an arc welding gun and an induction coil can relatively move.
3. The method for online adjustment of the phase ratio of the duplex stainless steel welding according to claim 1, wherein the welding fixture is provided with a vent hole, nitrogen is introduced into the vent hole, the nitrogen flow is 5-25L/min, the bottom of the workpiece is protected from being oxidized, and the formation of austenite at the bottom of the workpiece is promoted.
4. The method for online adjustment of phase ratio for duplex stainless steel welding according to claim 1, wherein the pretreatment of step 1 comprises deburring the surface of the workpiece and cleaning and degreasing.
5. The method for online adjustment of phase ratio for duplex stainless steel welding according to claim 1, wherein in the step 2, the arc welding gun is at the front and the laser is at the rear when the arc laser hybrid welding is performed.
6. The method for online adjustment of phase ratio for duplex stainless steel welding according to claim 5, wherein in step 2, specific welding process parameters are as follows: the distance between the optical wires is 0-10 mm, the laser power is 5-20 kW, the electric arc wire feeding speed is 2-20 m/min, and the electric arc protection gas is Ar+N 2 The flow is 15-25L/min, and the moving speed of the workpiece relative to the arc welding gun and the laser is 0.01-5 m/min.
7. The method for online adjustment of phase ratio for duplex stainless steel welding according to claim 1, wherein the electromagnetic induction heat treatment in step 3 comprises: the induction coil is kept above the weld joint to be processed for heat treatment, the workpiece is blown by the blowing device, nitrogen blown by the blowing device promotes the austenite growth of the welding joint in the induction process, the surface temperature of the workpiece is measured in real time by the infrared temperature measuring device, and the workpiece moves forwards relative to the induction coil.
8. The method for online adjustment of the phase ratio of the duplex stainless steel welding according to claim 7, wherein in the step 3, the moving speed of the workpiece relative to the induction coil is changed to 0.03-1 m/min during electromagnetic induction heat treatment, the workpiece is blown to the lower part of the induction coil during blowing by a blowing device, the nitrogen flow is 10-30L/min, the induction frequency of the induction coil is 10-30 kHZ, the height of the induction coil from the surface of the welding seam is 3-15 mm, and the induction heating temperature is 500-1300 ℃.
9. The method for online adjustment of the phase ratio of the duplex stainless steel welding according to claim 1, wherein in the step 4, the workpiece is naturally cooled first, when the temperature of the workpiece is naturally cooled to 600-700 ℃, a water cooling device is started to cool the welded workpiece, and water stains on the surface of the welded workpiece are blown off by a blowing device.
CN202310347589.1A 2023-04-04 2023-04-04 Method for online adjustment of phase proportion of duplex stainless steel welding Pending CN116140809A (en)

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