CN106181043A - A kind of welding method improving hybrid Laser-Arc Welding process stability - Google Patents

Abstract

A welding method for improving the stability of the laser-arc hybrid welding process, which relates to the field of material processing engineering. The invention performs low-temperature treatment on the shielding gas, and adds a separate side-axis shielding gas on one side of the arc welding torch, and its axis direction points to the laser The point of action and above, that is, the place where the photoplasma is generated during welding, achieves an increase in the stability of the welding process. The method of the invention has high welding efficiency, suppresses pores and thermal cracks, improves mechanical properties, and improves long welding seam welding stability.

Description

A Welding Method for Improving the Stability of Laser-Arc Hybrid Welding Process

technical field

The invention relates to the field of material processing engineering, in particular to a welding method for improving the stability of a laser-arc hybrid welding process.

Background technique

Laser-arc hybrid welding was first proposed and tested by British scholar W.M.Steen in the late 1970s. It combines two heat sources, laser and electric arc, to overcome the deficiency of a single heat source, so as to obtain the effects of increasing energy utilization and improving the stability of the welding process. Laser-arc composite heat source welding has the advantages of fast welding speed, large weld penetration, low heat input, and small deformation, so as to achieve the effects of low cost, high efficiency, and high adaptability. Especially suitable for medium and thick plate welding.

At present, the following problems exist when laser-arc hybrid welding is used:

(1) There is a phenomenon of "limited energy enhancement" in laser-arc hybrid welding, that is, there is a matching range. When laser and arc hybrid welding, only within a certain current range, the interaction between laser and arc has an enhanced effect, otherwise, The effect of hybrid welding is even worse than that of single laser welding;

(2) When using laser-arc hybrid welding, especially when laser-GMA arc hybrid welding is used, the requirements for the penetration depth of hybrid welding are relatively large, and the demand for laser power is high, which increases the cost of the laser, and when When the laser power is high, the reaction force of the laser plasma will seriously hinder the transfer of the GMA welding droplet, making the transfer of the GMA droplet difficult and unstable;

(3) When laser-arc hybrid welding is used for backing welding, since the arc is attracted by the side wall of the groove, a large area of both sides is melted, and defects such as pores and lack of fusion may be caused during the subsequent welding process;

(4) Due to the high laser power, the plasma cumulative effect increases during the welding process, which easily leads to a decrease in the effective power of the laser, and the reinforcement at the back of the weld is rapidly reduced or even incomplete penetration occurs;

(5) When welding thick plates, due to the action of plasma, the plasma has a certain loss of laser energy. Therefore, the input of laser welding energy is large, resulting in large welding stress and welding deformation, and the grains in the heat-affected zone are easy to grow. and embrittlement.

It can be seen from the above that in the laser-arc hybrid welding process, laser plasma is a key factor affecting the stability of the hybrid welding process and its welding effect.

At present, methods for suppressing laser plasma in the process of hybrid welding and improving the stability of the welding process include changing the type of shielding gas, adjusting welding parameters, and applying mechanical force and magnetic field. For example, patent CN201310039463.4 proposes a laser-TIG arc paraxial composite welding method and device with external high-frequency magnetic field, and patent CN201320057081.X proposes a laser-TIG arc coaxial composite welding device with external high-frequency magnetic field , Patent CN201320198864.X proposes a laser melting electrode arc paraxial composite welding device with external high-frequency magnetic field, but the above are all improvements to the arc to improve the hybrid welding effect, and there are few suppression measures for the laser.

Based on this, the present invention proposes a new method for suppressing laser plasma and improving the stability of the hybrid welding process—a welding method for improving the stability of the laser-arc hybrid welding process.

Contents of the invention

The invention aims at the problems existing in laser-MIG hybrid welding, and provides a low-temperature gas shielded laser-arc hybrid welding method.

On the basis of conventional laser-arc hybrid welding, the present invention improves the welding shielding gas delivery device. The specific implementation methods include:

(1) Change the ordinary plastic gas supply pipeline into a heat-insulated low-temperature gas pipeline, and directly use the low-temperature gas in the heat-insulated gas cylinder.

(2) Or use other devices to cool the gas. For example, use a refrigerator/cooler to cool the protective gas cylinder and gas pipeline, which can reduce the temperature of the protective gas from room temperature to about minus 50 degrees; use a cooling bath (as far as possible) Offered in a temperature range of typically 13 to -196°C) to cool the shielding gas cylinder to lower temperatures.

(3) A separate paraxial shielding gas is added to one side of the arc welding torch, and its axis direction points to the laser action point and above, that is, the place where photoinduced plasma is generated during welding, as shown in Figure 1.

A kind of welding method that improves laser-arc hybrid welding process stability of the present invention, it is to carry out according to the following steps:

Step 1: Before welding, process the parts to be welded into V-shaped grooves, U-shaped grooves or Y-shaped grooves, and grind and clean the processed grooves and the surfaces on both sides. After cleaning, the workpiece to be welded is fixed on the welding fixture;

Step 2: Use the fixture to rigidly fix the laser head, the arc welding torch and the side-axis shielding gas nozzle;

Step 3: Set welding process parameters:

Bottom welding: the defocus amount is ﹣3～﹢3mm, the laser power is 3000～8000W, the arc current is 100～200A, the laser arc distance is 3～5mm, the welding speed is 0.6～2m/min; the welding torch shielding gas adopts pure Ar gas or the mixed gas of CO ₂ and Ar, the protective gas flow rate is 20~40L/min, the protective gas temperature is -30℃~-160℃, the side shaft protective gas is Ar gas, the flow rate is 15~30L/min, the temperature is -50℃～-160℃;

Filler welding: the defocus amount is ﹣3～﹢3mm, the laser power is 400～800W, the arc current is 200～400A, the laser arc spacing is 2～5mm, the welding speed is 50～600mm/min, and the welding torch shielding gas adopts Ar gas , the flow rate is 10~20L/min, the protective gas temperature is -30℃~-160℃; the side shaft protective gas is Ar gas, the flow rate is 15~30L/min, and the temperature is -50℃~-160℃;

Step 4: In the actual welding process, the robot integrated system is used to control the welding process parameters. First, the arc starts, and then the arc stabilizes for 1 to 2 seconds, and the laser is controlled to emit laser light. Finally, the robot is controlled to make the laser working head and welding torch move together to complete the welding process. .

Compared with traditional laser-arc welding, the present invention mainly has the following advantages:

1. The welding efficiency is improved. Due to the strong cooling effect of the shielding gas, the arc shrinks significantly, the current density increases, the penetration depth increases and the fusion width decreases. Smaller grooves can be used for welding, especially when welding medium and thick plates, further compression arc, reducing sidewall melting. At the same time, the arc welding torch is cooled to reduce the burning of the tungsten electrode/avoid the overheating of the welding torch, and can carry out large-scale and standardized operations for a long time;

2. Inhibit pores and thermal cracks. Due to the increased cooling rate of the molten pool, it is beneficial to inhibit the metallurgical pores and thermal cracks in the center of the weld that are easy to occur at the fusion line during conventional laser-arc hybrid welding, and reduce welding defects;

3. Improve the mechanical properties. At a higher cooling rate, the weld grains are refined and the direction of the columnar grains is changed. At the same time, due to the reduction of welding heat input, the softening phenomenon of the joints is improved, and the comprehensive mechanical properties of the welded joints are improved.

4. Improve the welding stability of the long weld seam. Since the side-axis shielding gas can effectively suppress the laser plasma, it ensures that the overall weld seam is well formed when the long weld seam is welded.

Description of drawings

Fig. 1 is the schematic diagram of side shaft shielding gas of the present invention;

Fig. 2 is the macroscopic metallographic diagram of embodiment 2 welding 20mm thick low carbon steel;

Fig. 3 is the macroscopic metallographic diagram of embodiment 1 welding 20mm thick low carbon steel;

Fig. 4 is the welding heat-affected zone figure of embodiment 2 welding 20mm thick low carbon steel;

Fig. 5 is the welding heat-affected zone figure of embodiment 1 welding 20mm thick low carbon steel;

Fig. 6 is the topographic view of the back of the weld seam when the bottoming welding is carried out in embodiment 2;

Fig. 7 is the topographic view of the back of the weld seam when the bottoming welding is carried out in embodiment 1;

Fig. 8 is a macroscopic metallographic diagram of welding 6.6 mm thick high-strength steel in Example 3.

detailed description

Specific embodiment one: a kind of welding method that improves the stability of laser-arc hybrid welding process of the present embodiment, it is carried out according to the following steps:

Step 1: Before welding, process the parts to be welded into V-shaped grooves, U-shaped grooves or Y-shaped grooves, and grind and clean the processed grooves and the surfaces on both sides. After cleaning, the workpiece to be welded is fixed on the welding fixture;

Step 2: Use the fixture to rigidly fix the laser head, the arc welding torch and the side-axis shielding gas nozzle;

Step 3: Set welding process parameters:

Bottom welding: the defocus amount is ﹣3～﹢3mm, the laser power is 3000～8000W, the arc current is 100～200A, the laser arc distance is 3～5mm, and the welding speed is 0.3～3m/min; the welding gun shielding gas adopts pure Ar gas or CO2 and Ar mixed gas, the protective gas flow rate is 20~40L/min, the protective gas temperature is -30℃~-160℃, and the side shaft protective gas is Ar gas, the flow rate is 15~30L/min, and the temperature is - 50℃～-160℃;

Filler welding: the defocus amount is ﹣3～﹢3mm, the laser power is 400～800W, the arc current is 200～400A, the laser arc distance is 2～5mm, the welding speed is 50～800mm/min, and the welding torch shielding gas adopts Ar gas , the flow rate is 10~20L/min, the protective gas temperature is -30℃~-160℃; the side shaft protective gas is Ar gas, the flow rate is 15~30L/min, and the temperature is -50℃~-160℃;

Step 4: In the actual welding process, the robot integrated system is used to control the welding process parameters. First, the arc starts, and then the arc stabilizes for 1 to 2 seconds, and the laser is controlled to emit laser light. Finally, the robot is controlled to make the laser working head and welding torch move together to complete the welding process. .

In this embodiment, in the process of backing welding and filling welding, if wire feeding is required, the wire feeding speed is 2-6 m/min.

In this embodiment, in the laser-MAG hybrid welding with additional paraxial shielding gas, the laser can use _CO2 gas laser, YAG solid-state laser, semiconductor laser, among which the YAG solid-state laser with optical fiber transmission is the best, because it is more efficient and environmentally friendly ;The welding machine can use the model MV4000 Fronius TIG welding machine, the maximum welding current is 400A; the MIG/MAG welding machine of Fronius TPS4000, the current adjustment range is 3-400A, and the voltage adjustment range is 14.2-34V; Realize pulse welding. Other equipment includes 1 KUKA robot, the adjustment of process parameters during the welding process is realized through KUKA robot programming; 1 Fronius wire feeder to ensure accurate feeding of welding wire.

Embodiment 2: This embodiment is different from Embodiment 1 in that: the workpiece to be welded is steel, aluminum or titanium alloy. Others are the same as in the first embodiment.

Embodiment 3: The difference between this embodiment and Embodiment 1 is that the torch shielding gas is mixed with CO ₂ and Ar in any ratio during back welding. Others are the same as in the first embodiment.

Embodiment 4: The difference between this embodiment and Embodiment 1 is that the shielding gas of the torch is CO ₂ and Ar mixed gas during the bottom welding process, and the temperature of the shielding gas is 0°C to -40°C. Others are the same as in the first embodiment.

Embodiment 5: This embodiment is different from Embodiment 1 in that: the shielding gas of the torch is CO ₂ and Ar mixed gas in the root welding process, and the temperature of the shielding gas is 0°C to -30°C. Others are the same as in the first embodiment.

Embodiment 6: This embodiment is different from Embodiment 1 in that: the shielding gas of the torch is CO ₂ and Ar mixed gas during the root welding process, and the temperature of the shielding gas is 0°C to -20°C. Others are the same as in the first embodiment.

Embodiment 7: The difference between this embodiment and Embodiment 1 is that the shielding gas of the welding torch adopts CO ₂ and Ar mixed gas during the bottom welding process, and the temperature of the shielding gas is 0°C to -10°C. Others are the same as in the first embodiment.

Embodiment 8: This embodiment is different from Embodiment 1 in that: the temperature of the shielding gas of the torch during the back welding process is -50°C to -160°C. Others are the same as in the first embodiment.

Embodiment 9: This embodiment is different from Embodiment 1 in that: the temperature of the shielding gas of the welding torch is -50° C. to -120° C. during root pass welding. Others are the same as in the first embodiment.

Embodiment 10: This embodiment is different from Embodiment 1 in that: the temperature of the shielding gas of the welding torch is -50° C. to -100° C. during the root pass welding process. Others are the same as in the first embodiment.

Embodiment 11: This embodiment is different from Embodiment 1 in that: the temperature of the shielding gas of the welding torch is -50° C. to -80° C. during the root pass welding process. Others are the same as in the first embodiment.

Embodiment 12: This embodiment is different from Embodiment 1 in that: the temperature of the shielding gas of the welding torch is -50° C. to -70° C. during the root pass welding process. Others are the same as in the first embodiment.

Specific Embodiment Thirteen: The difference between this embodiment and specific embodiment 1 is that the temperature of the side-axis shielding gas is -80°C to -120°C during the bottom welding process. Others are the same as in the first embodiment.

Embodiment 14: The difference between this embodiment and Embodiment 1 is that the temperature of the side-axis shielding gas is -80° C. to -160° C. during the back welding process. Others are the same as in the first embodiment.

Embodiment 15: The difference between this embodiment and Embodiment 1 is that the temperature of the side-axis shielding gas is -80°C to -120°C during the back welding process. Others are the same as in the first embodiment.

Embodiment 16: This embodiment is different from Embodiment 1 in that: the temperature of the side-axis shielding gas is -80°C to -100°C during the bottom welding process. Others are the same as in the first embodiment.

Embodiment 17: This embodiment is different from Embodiment 1 in that: the temperature of the welding torch shielding gas during the filling welding process is -50°C to -160°C. Others are the same as in the first embodiment.

Embodiment 18: This embodiment differs from Embodiment 1 in that: the temperature of the welding torch shielding gas during the filling welding process is -50°C to -140°C. Others are the same as in the first embodiment.

Embodiment 19: The difference between this embodiment and Embodiment 1 is that the temperature of the shielding gas of the torch during the filling welding process is -50°C to -120°C. Others are the same as in the first embodiment.

Embodiment 20: This embodiment is different from Embodiment 1 in that: the temperature of the welding torch shielding gas during the filling welding process is -50°C to -100°C. Others are the same as in the first embodiment.

Embodiment 21: This embodiment is different from Embodiment 1 in that: the temperature of the torch shielding gas during the filling welding process is -50°C to -80°C. Others are the same as in the first embodiment.

Embodiment 22: This embodiment is different from Embodiment 1 in that: the temperature of the side-axis shielding gas during the filling welding process is -80°C to -160°C. Others are the same as in the first embodiment.

Embodiment 23: This embodiment is different from Embodiment 1 in that: the temperature of the side-axis shielding gas during the filler welding process is -80°C to -140°C. Others are the same as in the first embodiment.

Embodiment 24: This embodiment is different from Embodiment 1 in that the temperature of the side-axis shielding gas during the filler welding process is -80°C to -120°C. Others are the same as in the first embodiment.

Embodiment 25: This embodiment is different from Embodiment 1 in that: the temperature of the side-axis shielding gas during the filler welding process is -80°C to -100°C. Others are the same as in the first embodiment.

The content of the present invention is not limited to the content of the above-mentioned embodiments, and a combination of one or several specific embodiments can also achieve the purpose of the invention.

Verify beneficial effect of the present invention by above embodiment:

The method of the present invention and the conventional laser-MIG composite welding method are respectively used to carry out root welding of the 20mm thick low carbon steel butt weld. The specific experimental method is as follows:

Example 1

Adopt the inventive method to carry out the bottom welding of 20mm thick low carbon steel butt weld, concrete process is as follows:

Step 1: Before welding, according to the thickness of the plate, process the part to be welded into a Y-shaped groove, the thickness of the blunt edge is 10mm, and the angle of the groove is 20°C, and the processed groove and the surfaces on both sides are processed. Grinding or cleaning, fixing the workpiece to be welded after grinding or cleaning on the welding fixture;

Step 2: Rigidly fix the laser head and the MIG welding torch (side-axis shielding gas nozzle) with a special fixture;

Step 3: Set welding process parameters:

The defocus amount is -2mm, the laser power is 6500W, the arc current is 140A, the laser arc distance is 3mm, and the welding speed is 1.2m/min. The shielding gas of the torch is Ar gas, the flow rate is 25L/min, -60°C, the shielding gas of the side shaft is Ar gas, the flow rate is 25L/min, and the temperature is set at -83°C.

Step 4: In the actual welding process, the robot integrated system is used to control the welding process parameters. First, the MIG arc starts, then the arc stabilizes for 1-2 seconds, then the laser is controlled to emit laser light, and finally the robot is controlled so that the laser working head and the MIG welding torch move together to complete welding process.

Example 2

Use the conventional method to carry out root welding of 20mm thick low carbon steel butt weld, the specific process is as follows:

Step 1: Before welding, according to the thickness of the plate, process the part to be welded into a U-shaped groove, the thickness of the blunt edge is 10mm, and the angle of the groove is 20°C, and the processed groove and the surfaces on both sides are processed. Grinding or cleaning, fixing the workpiece to be welded after grinding or cleaning on the welding fixture;

Step 2: Use a special fixture to rigidly fix the laser head and the MIG welding torch;

Step 3: Set welding process parameters:

The defocus amount is -2mm, the laser power is 6500W, the arc current is 140A, the laser arc distance is 3mm, and the welding speed is 1.2m/min; the welding torch shielding gas uses Ar gas, the flow rate is 30L/min, room temperature (20°C);

Step 4: In the actual welding process, the robot integrated system is used to control the welding process parameters. First, the MIG arc starts, then the arc stabilizes for 1-2 seconds, then the laser is controlled to emit laser light, and finally the robot is controlled so that the laser working head and the MIG welding torch move together to complete welding process.

Fig. 2 to Fig. 5 are the welding seam cross-sectional morphology when adopting conventional laser-MIG hybrid welding and the method of the present invention to carry out bottom welding respectively, it can be seen that when adopting this method to carry out bottom welding, the blunt surface of 10 mm can be penetrated at one time. Edge, and the welding process is stable, the droplet transfer behavior is good, uniform, the amount of sidewall melting is reduced, and there are no obvious bad defects. At the same time, the range of the arc zone and heat-affected zone is reduced, as shown in Figure 4 and Figure 5.

Fig. 6 and Fig. 7 are respectively adopting conventional laser-MIG hybrid welding and the appearance of the back of the weld seam when the method of the present invention is used for bottoming welding. It can be seen that due to the rapid growth of laser plasma during conventional welding, the back of the weld No penetration, but similar power adopts this method, the welding process is stable, the back penetration is uniform, and the energy attenuation is not obvious.

Example 3

Adopt the method of the present invention to carry out 6.6mm thick high-strength steel butt weld, concrete process is as follows:

Step 1: Before welding, according to the thickness of the plate, process the part to be welded into a Y-shaped groove, the thickness of the blunt edge is 3mm, and the angle of the groove is 45°C, and the processed groove and the surfaces on both sides are processed. Grinding or cleaning, fixing the workpiece to be welded after grinding or cleaning on the welding fixture;

Step 2: Use a special fixture to rigidly fix the laser head and TIG welding torch (side-axis shielding gas nozzle);

Step 3: Set welding process parameters:

The defocus amount is -2mm, the laser power is 3400W, the arc current is 140A, the laser arc distance is 3mm, and the welding speed is 800mm/min. The shielding gas of the torch is Ar gas, the flow rate is 25L/min, -60°C, the shielding gas of the side shaft is Ar gas, the flow rate is 25L/min, the temperature is set to -83°C, and the wire feeding speed is 2.5m/min.

Filler welding: the defocus amount is ﹢2mm, the laser power is 800W, the arc current is 260A, the laser arc distance is 3mm, the welding speed is 600mm/min, the welding torch shielding gas is Ar gas, the flow rate is 20L/min, and the shielding gas temperature is -30°C; Ar gas is used as the protective gas for the side shaft, the flow rate is 15L/min, the temperature is -60°C, and the wire feeding speed is 4m/min;

Step 4: In the actual welding process, the robot integrated system is used to control the welding process parameters. First, the MIG arc starts, and then the arc stabilizes for 1 to 2 seconds, then the laser is controlled to emit laser light, and finally the robot is controlled to make the laser working head and TIG welding torch move together Complete the welding process.

The metallographic diagram of welding 6.6 mm thick high-strength steel in this embodiment is shown in FIG. 8 .

The method of this embodiment has the following advantages:

1. The welding efficiency is improved. Due to the strong cooling effect of the shielding gas, the arc shrinks significantly, the current density increases, the penetration depth increases and the fusion width decreases. Smaller grooves can be used for welding, especially when welding medium and thick plates, further compression arc, reducing sidewall melting. At the same time, the arc welding torch is cooled to reduce the burning of the tungsten electrode/avoid the overheating of the welding torch, and can carry out large-scale and standardized operations for a long time;

2. Inhibit pores and thermal cracks. Due to the increased cooling rate of the molten pool, it is beneficial to inhibit the metallurgical pores and thermal cracks in the center of the weld that are easy to occur at the fusion line during conventional laser-arc hybrid welding, and reduce welding defects;

3. Improve the mechanical properties. At a higher cooling rate, the weld grains are refined and the direction of the columnar grains is changed. At the same time, due to the reduction of welding heat input, the softening phenomenon of the joints is improved, and the comprehensive mechanical properties of the welded joints are improved.

4. Improve the welding stability of the long weld seam. Since the side-axis shielding gas can effectively suppress the laser plasma, it ensures that the overall weld seam is well formed when the long weld seam is welded.

Claims (10)

1. the welding method improving laser-arc hybrid welding in industry process stability, it is characterised in that it is according to following step Suddenly carry out:

Step one: before welding, is processed into double V-groove, U-shaped groove or Y type groove by the position to be welded of workpiece to be welded, and to adding Groove and both side surface after work are polished and clean, and the workpiece to be welded after polishing or cleaning is fixed on welding tool setup On；

Step 2: utilize fixture to protect gas jets to rigidly fix with arc welding gun and paraxonic laser head；

Step 3: welding condition is set:

Backing welding: defocusing amount is 3～3mm, laser power is 3000～8000W, and arc current is 100～200A, laser electricity Arc spacing is 3～5mm, and speed of welding is 0.6～2m/min；Welding gun protection gas uses pure Ar gas or CO₂With Ar gaseous mixture, protection Throughput is 20～40L/min, protection temperature be-30 DEG C～-160 DEG C, paraxonic protection gas employing Ar gas, flow be 15～ 30L/min, temperature is-50 DEG C～-160 DEG C；

Fill weldering: defocusing amount is 3～3mm, and laser power is 400～800W, and arc current is 200～400A, laser-arc Spacing is 2～5mm, and speed of welding is 50～600mm/min, and welding gun protection gas uses Ar gas, and flow is 10～20L/min, protects Protect temperature and be-30 DEG C～-160 DEG C；Paraxonic protection gas use Ar gas, flow is 15～30L/min, temperature be-50 DEG C～- 160℃；

Step 4: during actual welding, uses robot integrated system to control welding condition, first Arc, Then arc stability 1～2s, laser control sends laser, finally controls robot and laser work head and welding gun are transported jointly Move welding process.

A kind of welding method improving laser-arc hybrid welding in industry process stability the most according to claim 1, its feature It is that workpiece to be welded is steel, aluminum or titanium alloy.

A kind of welding method improving laser-arc hybrid welding in industry process stability the most according to claim 1, its feature During being backing welding, welding gun protection gas uses CO₂It is to be mixed by any ratio with Ar gaseous mixture.

4. according to a kind of welding method improving laser-arc hybrid welding in industry process stability described in claim 1 or 3, its During being characterised by backing welding, welding gun protection gas uses CO₂With Ar gaseous mixture, the temperature of protection gas is 0 DEG C～-40 DEG C.

A kind of welding method improving laser-arc hybrid welding in industry process stability the most according to claim 1, its feature During being backing welding, welding gun protection temperature is-50 DEG C～-160 DEG C.

A kind of welding method improving laser-arc hybrid welding in industry process stability the most according to claim 5, its feature During being backing welding, welding gun protection temperature is-80 DEG C～-120 DEG C.

A kind of welding method improving laser-arc hybrid welding in industry process stability the most according to claim 1, its feature During being backing welding, paraxonic protection temperature is-80 DEG C～-120 DEG C.

A kind of welding method improving laser-arc hybrid welding in industry process stability the most according to claim 7, its feature During being backing welding, paraxonic protection temperature is-80 DEG C～-100 DEG C.

A kind of welding method improving laser-arc hybrid welding in industry process stability the most according to claim 1, its feature During being to fill weldering, welding gun protection temperature is-50 DEG C～-120 DEG C.

A kind of welding method improving laser-arc hybrid welding in industry process stability the most according to claim 1, it is special Levy paraxonic protection temperature during being to fill weldering and be-80 DEG C～-120 DEG C.