A method of welding a full position hole angle

Abstract

The present application relates to the technical field of rail welding, and particularly relates to a welding method for full-position hole internal corner, which comprises the following steps: selecting welding conditions; setting welding parameters, and welding base material by adopting CMT pulse mode; wherein, starting arc from 5-6 o'clock position, and when welding to 7-9 o'clock position, the nozzle is attached to 3-5 o'clock position, taking 3-5 o'clock position as fulcrum, welding to 10 o'clock position at a second welding speed, and then welding to 12 o'clock position at a third welding speed; starting arc from 5-6 o'clock position, and when welding to 1-3 o'clock position, the nozzle is attached to 6-8 o'clock position, taking 6-8 o'clock position as fulcrum, welding upward angle welding PD position, and then welding to 12 o'clock position at a fifth welding speed. The welding method for full-position hole internal corner of the present application embodiment reduces the difficulty and working strength of operation, guarantees the welding quality, and is beneficial to improving the qualified rate of weld.

Description

Technical Field

[0001] This invention relates to the field of track welding technology, and in particular to a welding method for the inner corner of holes in all positions. Background Technology

[0002] During the production of subway vehicles, the car body structure adopts a large number of all-position hole fillet welds.

[0003] Ordinary pulsed arc welding is used, with the arc starting at the 6 o'clock position and welding proceeding to the 12 o'clock position. During welding, due to the variability of the welding arc length and limitations in welder operation, various defects exist in the weld. During weld visual inspection, root depressions or insufficient penetration (weld bleeding) are very likely to appear on the back of the weld; the weld transition at the weld toe is too steep, indicating excessive convexity; incomplete root fusion is very likely to occur at the arc initiation point; and undercut defects are very likely to appear in the PD position of overhead welding.

[0004] Fillet welding inside holes requires welders to constantly change angles, placing extremely high demands on their operational skills. However, due to the limitations of manual welding, most welders cannot quickly change the welding torch angle. Furthermore, the poor fluidity of the molten pool in stainless steel welds limits welding speed, leading to substandard welds. During the evaluation of welded test pieces, all six holes on a test plate failed visual inspection after welding, with most holes exhibiting root indentation or insufficient penetration on the back side. Metallographic analysis revealed that incorrect welding torch angle caused root fusion failure, severely impacting the welding quality and safety performance of the vehicle body.

[0005] Therefore, an all-position hole internal corner welding operation method is needed. Welding methods and techniques must be improved to increase the welder's welding speed and adaptability, thereby ensuring the quality of the weld. Summary of the Invention

[0006] To solve at least one of the above-mentioned technical problems, the present invention provides a welding method for the inner corner of a hole in all positions.

[0007] In one aspect, the present invention provides a welding method for the inner angle of an all-position hole. The welding method includes: selecting welding conditions; setting welding parameters; and welding the base material using CMT pulse mode. Specifically, the arc is initiated from the 5-6 o'clock position, and the welding torch is moved at a first welding speed at a 40-50° angle to the base plate. When welding reaches the 7-9 o'clock position, the nozzle is placed at the 3-5 o'clock position, using the 3-5 o'clock position as a fulcrum, and the PD (Position Detector) and PF (Position PF) positions are welded at an upward angle. The welding is then performed at a second welding speed at a uniform speed until the 10 o'clock position, and then at a third welding speed at a uniform speed until the 12 o'clock position. The arc is then initiated from the 5-6 o'clock position, and the welding torch is moved at a fourth welding speed at a 40-50° angle to the base plate. When welding reaches the 1-3 o'clock position, the nozzle is placed at the 6-8 o'clock position, using the 6-8 o'clock position as a fulcrum, and the PD (Position Detector) position is welded at an upward angle. The welding is then performed at a fifth welding speed at a uniform speed until the 12 o'clock position.

[0008] Furthermore, the first welding speed is 5-6 mm / s.

[0009] Furthermore, the second welding speed is 4-5 mm / s.

[0010] Furthermore, the third welding speed is 6-7 mm / s.

[0011] Furthermore, the fourth welding speed is 4-5 mm / s.

[0012] Furthermore, the fifth welding speed is 6-7 mm / s.

[0013] Furthermore, the welding conditions include: a welding wire diameter of 1.0-1.6 mm; and / or a gas composition of 98% Ar + 2% O2; and / or a gas flow rate of 14-18 L / min.

[0014] Furthermore, the welding parameters include: a welding current of 60-80A; and / or a welding voltage of 16.8-18.4V.

[0015] Furthermore, welding parameters also include a welding arc length correction value of 5 to 15, for example, 6, 7, 8, 9, 11, 12, 14, etc. The welding arc length correction value (also called the arc length correction coefficient) is a parameter used to adjust the arc length during welding. In the welding field, the arc length correction value is usually a dimensionless numerical value; it represents a relative adjustment to the standard arc length, rather than a physical quantity with a specific unit of length. Therefore, the arc length correction value has no unit; it is a dimensionless adjustment coefficient.

[0016] Furthermore, the distance between the center of the welding arc and the root of the base plate is 0.5-1.5 mm.

[0017] Furthermore, the thickness of the base material is 0.5-5mm.

[0018] The technical solution provided by this invention has the following advantages:

[0019] The welding method for the inner corner of the hole in all positions according to the present invention is simple to operate, easy for welders to master, and reduces the training cost for welders.

[0020] The welding method for the inner angle of the all-position hole in this invention reduces the difficulty and workload of skilled workers, while avoiding the problem that welders cannot quickly and stably adjust the welding gun angle manually when welding at 180°. This helps to ensure welding quality, improve the pass rate, and thus improve work efficiency.

[0021] The welding method for all-position hole inner corners of the present invention can weld inner corners of holes with unequal thicknesses (e.g., 1mm for the bottom plate and 2mm for the top plate). After welding, both the appearance inspection and internal metallographic inspection of the weld meet the requirements of ISO5817 standard.

[0022] The welding method for all-position hole inner corners of the present invention can weld inner corner welds of different hole diameters.

[0023] Furthermore, CMT pulse arc initiation speed is twice as fast as ordinary pulse, preventing defects such as incomplete fusion and excessive weld reinforcement caused by slow arc initiation. CMT pulse welding also ensures consistent arc length even when wire extension or feed speed changes, preventing poor weld formation and internal defects. CMT pulse welding produces almost no spatter; therefore, the all-position hole corner welding method of this invention can be used for welding exposed surfaces of subway vehicles. CMT pulse welding achieves a better appearance, with smooth weld transitions and no welding defects. CMT pulse welding has lower heat input, making it suitable for welding the inner corners of holes in thin plates and thin-to-thick plates, with less post-weld deformation. Simultaneously, the oxide color on the back side is easier to remove after welding. CMT pulse welding uses a CMT+pulse transition mode, resulting in fast welding speed, effectively improving the fluidity of the stainless steel weld pool and enhancing weld quality. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the welding torch angle during arc initiation in the welding method for the all-position hole interior angle according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the welding torch angle when the arc is started at the 5 o'clock position on the right side of the welding method for welding the inner corner of the hole in all positions according to an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the angle of the welding torch nozzle contact point (4 o'clock position) when welding the left side in the all-position hole internal corner welding method of this invention;

[0029] Figure 4 This is a schematic diagram of the welding torch nozzle contact point (7 o'clock position) when welding the right side of the all-position hole internal corner welding method according to an embodiment of the present invention;

[0030] Figure 5 This is a three-dimensional schematic diagram of the welding torch nozzle contact point (7 o'clock position) when welding the right side of the all-position hole internal corner welding method according to an embodiment of the present invention;

[0031] Figure 6 This is a three-dimensional schematic diagram of the welding torch nozzle contact point (4 o'clock position) when welding the left side in the all-position hole internal corner welding method of this invention embodiment;

[0032] Figure 7 This is a macroscopic metallographic image of the weld obtained by the welding method for the inner corner of the hole in all positions according to Embodiment 1 of the present invention.

[0033] Figure 8 This is a macroscopic metallographic image of the weld obtained by the welding method of Comparative Example 1 of the present invention. Attached image description:

[0035] 1-Base plate, 2-Top plate, 3-Welding wire, 4-Nozzle, 5-4 o'clock position, 6-7 o'clock position. Detailed Implementation

[0036] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0037] Many specific details are set forth in the following description in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the invention, and not all embodiments.

[0038] According to an embodiment of the present invention, a welding method for the inner angle of an all-position hole is provided. The welding method includes: selecting welding conditions; setting welding parameters; and welding the base material using CMT pulse mode. Specifically, the arc is initiated from the 5-6 o'clock position, and the welding torch is moved at a first welding speed at a 40-50° angle to the base plate. When welding reaches the 7-9 o'clock position, the nozzle is placed at the 3-5 o'clock position, using this as a fulcrum, and the PD (Positioning Point) and PF (Positioning Point) positions are welded at an upward angle. Welding is then performed at a second welding speed at a uniform speed until the 10 o'clock position, and then at a third welding speed at a uniform speed until the 12 o'clock position. The arc is initiated from the 5-6 o'clock position, and the welding torch is moved at a fourth welding speed at a 40-50° angle to the base plate. When welding reaches the 1-3 o'clock position, the nozzle is placed at the 6-8 o'clock position, using this as a fulcrum, and the PD (Positioning Point) position is welded at an upward angle. Finally, welding is performed at a fifth welding speed at a uniform speed until the 12 o'clock position.

[0039] The welding method for the inner angle of the all-position hole in this invention reduces the difficulty and workload of skilled workers, while avoiding the problem that the welder cannot quickly and stably adjust the welding gun angle manually when welding at 180°, which helps to ensure welding quality and improve work efficiency.

[0040] In some embodiments of the present invention, a welding method for the inner corner of an all-position hole includes the following steps:

[0041] (1) Select welding parameters

[0042] Select a welding wire diameter of 1.0-1.6mm (e.g., 1.0mm, 1.2mm, 1.6mm, etc.), a gas composition of 98%Ar + 2%O2, and a gas flow rate of 14-18L / min (e.g., 14.6L / min, 15.3L / min, 15.9L / min, 16.8L / min, 17.6L / min, etc.). Use a Fnix TPS2700 welding machine with a rated current of 270A and a push-pull wire welding torch.

[0043] (2) Preparation before welding

[0044] Before welding, remove oil, rust, and other contaminants from within a 30mm radius on both sides of the weld. Grind the base plate surface until a metallic luster is exposed. Tack weld before welding, and the gap after tack welding should be 0-0.5mm (e.g., 0.12mm, 0.21mm, 0.37mm, 0.41mm, 0.48mm, etc.).

[0045] (3) Welding process

[0046] The base material is welded using CMT pulse welding, with a droplet transfer pattern of CMT + pulse transfer. The welding torch nozzle diameter is 19mm, the welding current is 60-80A (e.g., 60A, 63A, 68A, 72A, 76A, etc.), the welding arc length correction value is 5-15 (e.g., 6, 8, 10, 13, 14, etc.), and the welding voltage is 16.8-18.4V (e.g., 16.9V, 17.1V, 17.6V, 17.8V, 18.3V, etc.). The welding machine is set to a special 4-step mode, and the arc current decay time is adjusted to 3-7s (e.g., 4s, 5s, 6s, etc.). The welding machine arc current, i.e., IS, is set to 120-140% (e.g., 123%, 126%, 131%, 136%, 139%, etc.). Use 120-140% of the welding arc-starting current to start the arc. Once the arc is started, release the switch immediately. Do not use the arc-starting current continuously to prevent weld penetration or burn-through.

[0047] When initiating the arc, start at the 5-6 o'clock position (preferably the 5 o'clock position) with the welding torch angled at 40-50° to the base plate (e.g., 42°, 43°, 45°, 46°, 48°, etc.). The wire extension length is 10mm. Quickly weld to the 7-9 o'clock position (preferably the 8 o'clock position). During welding, observe that the root of the weld is well fused and that the edge of the upper plate bevel melts and moves at a uniform speed. Weld at a first welding speed of 5-6mm / s (e.g., 5.3mm / s, 5.4mm / s, 5.6mm / s, 5.8mm / s, 5.9mm / s, etc.). When welding to the 7-9 o'clock position (preferably the 8 o'clock position), quickly press the torch downwards and place the nozzle at the 3-5 o'clock position (preferably the 4 o'clock position). Using this as a fulcrum, rotate the welding torch downwards and weld upwards to the PF and PD positions, welding to the 12 o'clock position. When welding positions 8-10, the welding torch should be pointed towards the root of the weld. Observe that the root weld has good fusion and the arc is at the very front of the molten pool. Weld at a second welding speed of 4-5 mm / s (e.g., 4.2 mm / s, 4.3 mm / s, 4.5 mm / s, 4.7 mm / s, 4.9 mm / s, etc.). When welding positions 10-12, the distance between the welding torch and the root of the base plate (i.e., the distance between the center of the welding arc and the root of the base plate) should be 0. At a position of 0.5-1.5mm (e.g., 0.7mm, 0.9mm, 1.1mm, 1.3mm, 1.4mm, etc., preferably 1mm), on the one hand, the weld reinforcement is too high, and on the other hand, the angle between the weld and the base plate is too small. Welding is carried out at a third welding speed of 6-7mm / s (e.g., 6.1mm / s, 6.3mm / s, 6.5mm / s, 6.8mm / s, 6.9mm / s, etc.) up to the 12 o'clock position.

[0048] After welding the left side, starting from the 5-6 o'clock position, passing through the 7-9 o'clock position, and reaching the 12 o'clock position, use a milling cutter to grind the starting and ending points of the arc into a slope shape.

[0049] When welding the right-side weld seam, starting from the 5-6 o'clock position, passing through the 1-3 o'clock position, and reaching the 12 o'clock position, initiate the arc at the 5-6 o'clock position (preferably the 5 o'clock position). Pay attention to the welding torch angle when initiating the arc, ensuring the torch is at a 40-50° (preferably 45°) angle to the base plate, perpendicularly pointing towards the 5 o'clock position, with an extension length of 10-12 mm. After initiating the arc, slightly wiggle the torch to ensure a good joint. Once the molten pool has opened, weld the PF position seam upwards. During welding, ensure the welding torch is at a 45° angle to the base plate, perpendicularly pointing towards the weld root. Weld at a fourth welding speed of 4-5 mm / s (e.g., 4.1 mm / s, 4.2 mm / s, 4.4 mm / s, 4.7 mm / s, 4.9 mm / s, etc.). When welding to the 1-3 o'clock position (preferably the 2 o'clock position), quickly press the nozzle down to the 6-8 o'clock position (preferably the 7 o'clock position), with the welding torch pointing at a distance of 0.5-1.5 mm (e.g., 0.6 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.4 mm, etc.) from the root of the base plate (i.e., the distance between the center of the welding arc and the root of the base plate is 0.5-1.5 mm). Weld the overhead angle weld at the PD position to the 12 o'clock position; weld at a fifth welding speed of 6-7 mm / s (e.g., 6.1 mm / s, 6.2 mm / s, 6.4 mm / s, 6.7 mm / s, 6.9 mm / s, etc.). When welding to the joint at the 12 o'clock position, to prevent crater cracking and excessively high weld joint, use the arc-breaking method to terminate the arc and fill the crater.

[0050] In some embodiments of the present invention, in step (3), the base material includes a base plate and an upper plate.

[0051] In some embodiments of the present invention, in step (3), the angle of the welding torch during arc initiation is shown in the schematic diagram. Figure 1 As shown.

[0052] In some embodiments of the present invention, in step (3), the welding torch angle is shown in the schematic diagram when the arc is started at the 5 o'clock position on the right side. Figure 2 As shown.

[0053] In some embodiments of the present invention, in step (3), a schematic diagram of the welding torch nozzle contact point at the 4 o'clock position when welding the left side is shown below. Figure 3 As shown; a three-dimensional schematic diagram of the welding torch nozzle contact point (4 o'clock position) when welding the left side is shown below. Figure 6 As shown.

[0054] In some embodiments of the present invention, in step (3), a schematic diagram of the welding torch nozzle contact point at the 7 o'clock position when welding the right side is shown below. Figure 4 As shown; a three-dimensional schematic diagram of the welding torch nozzle contact point (7 o'clock position) when welding the right side is shown below. Figure 5 As shown.

[0055] In some embodiments of the present invention, the distance from the welding torch to the base plate and the root refers to the distance between the center of the welding arc and the root of the base plate.

[0056] The technical solution of the present invention will be further explained and illustrated below through specific embodiments.

[0057] Example 1

[0058] A welding method for the inner corner of an all-position hole with a base material thickness of 2mm and a hole diameter of 20mm includes the following steps:

[0059] (1) Select welding parameters

[0060] The welding wire diameter is selected as 1.0 mm, the gas composition is 98% Ar + 2% O2, and the gas flow rate is 14-18 L / min. The welding machine is a Fronius TPS2700 with a rated current of 270 A, and the welding torch is a push-pull wire welding torch.

[0061] (2) Preparation before welding

[0062] Before welding, remove oil, rust, and other contaminants from within a 30mm radius on both sides of the weld, and grind the surface of the base plate to expose a metallic luster. Tack weld before welding; the gap after tack welding should be 0-0.5mm.

[0063] (3) Welding process

[0064] The base material was welded using CMT pulse welding, with a droplet transfer pattern of CMT + pulse transfer. The welding torch nozzle diameter was 19mm, the welding current was 68A, the arc length correction value was 10, and the welding voltage was 17.4V. The welding machine was set to a special 4-step mode, and the arc current decay time was adjusted to 7s. The arc current was set to 130% (IS). The arc was initiated using a 130% arc current, and the switch was released immediately after arc initiation. The arc should not be used continuously to prevent weld penetration or burn-through.

[0065] When initiating the arc, start at the 5 o'clock position, with the welding torch angled at 45º to the base plate and the welding wire extension length at 10mm. Quickly weld to the 8 o'clock position. During welding, observe good fusion at the weld root and uniform speed after melting the edge of the upper plate bevel, using the first welding speed of 5-6mm / s. When welding to the 8 o'clock position, quickly press the torch downwards, placing the nozzle at the 4 o'clock position. Using this as a fulcrum, rotate the welding torch downwards and weld upwards at the PD (protruding point) and PF (perpendicular point) positions, welding to the 12 o'clock position. Between the 8 and 10 o'clock positions, point the welding torch towards the weld root, observing good fusion at the root and the arc at the very front of the molten pool, using the second welding speed of 4-5mm / s. Between the 10 and 12 o'clock positions, point the welding torch 1mm from the base plate to prevent excessive weld reinforcement and an excessively small angle between the weld and the base plate, using the third welding speed of 6-7mm / s.

[0066] After welding the left side, use a milling cutter to grind the starting and ending points of the arc into a slope shape.

[0067] When welding the right-side weld, initiate the arc at the 5-6 o'clock position. When initiating the arc, pay attention to the welding torch angle; the torch should be at a 45° angle to the base plate, pointing vertically towards the 5 o'clock position, with a 10mm extension. After initiating the arc, slightly wiggle the torch to ensure a good joint. Once the molten pool opens, weld the vertical PF position weld upwards. During welding, ensure the welding torch is at a 45° angle to the base plate, pointing vertically towards the weld root. Weld at the fourth welding speed of 4-5 mm / s. When welding to the 2 o'clock position, quickly press the nozzle down to the 7 o'clock position, pointing the torch 1mm from the root of the base plate. Weld the overhead PD position weld to the 12 o'clock position, using the fifth welding speed of 6-7 mm / s. When welding to the joint at the 12 o'clock position, to prevent crater cracking and an excessively high weld joint, use the arc-breaking method to finish the arc and fill the crater.

[0068] Figure 7 This is a macroscopic metallographic image of the weld obtained using the all-position hole interior angle welding method. For example... Figure 7 As shown, the weld inspection obtained by the welding method for the inner corner of the hole in all positions according to the embodiment of the present invention meets the requirements of ISO5817-B; wherein, when 20 operators perform welding, the weld obtained by 19-20 operators is qualified.

[0069] Comparative Example 1

[0070] A welding method for a base material with a thickness of 2 mm and a hole diameter of 20 mm includes the following steps:

[0071] (1) Select welding parameters

[0072] The welding wire diameter is selected as 1.0 mm, the gas composition is 98% Ar + 2% O2, and the gas flow rate is 14-18 L / min. The welding machine is a Fronius TPS2700 with a rated current of 270 A, and the welding torch is a push-pull wire welding torch.

[0073] (2) Preparation before welding

[0074] Before welding, remove oil, rust, and other contaminants from within a 30mm radius on both sides of the weld, and grind the surface of the base plate to expose a metallic luster. Tack weld before welding; the gap after tack welding should be 0-0.5mm.

[0075] (3) Welding process

[0076] The base material is welded using ordinary pulsed arc welding, starting from the 6 o'clock position and continuing to the 12 o'clock position.

[0077] Figure 8 This is a macroscopic metallographic image of the weld obtained using a conventional pulsed arc welding method. For example... Figure 8 As shown, the metallographic examination of the weld obtained by the welding method of Comparative Example 1 using ordinary pulse welding showed that the root was not fused; wherein, when 20 operators performed welding in Example 1, the weld obtained by 1-2 operators was qualified.

[0078] In summary, the welding method for the inner angle of the hole in all positions according to the present invention reduces the difficulty of operation and the intensity of work, while avoiding the problem that the welder cannot quickly and stably adjust the angle of the welding gun when manually operating during 180° welding. This helps to ensure welding quality, improve the pass rate of welds, and also improve work efficiency.

[0079] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0080] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A welding method for the inner corner of an all-position hole, characterized in that, The welding method includes: Select welding conditions; Set the welding parameters and use the CMT pulse method to weld the base material; The process begins with starting the arc at the 5-6 o'clock position. The welding torch is angled at 40-50° to the base plate and moves at a constant speed using the first welding speed. When welding to the 7-9 o'clock position, the nozzle is placed at the 3-5 o'clock position. Using the 3-5 o'clock position as a fulcrum, the torch is used to weld the PD position at an overhead angle and the PF position at a vertical angle. The torch is then welded at a constant speed using the second welding speed until the 10 o'clock position, and finally welded at a constant speed using the third welding speed until the 12 o'clock position. Start the arc from the 5-6 o'clock position, and proceed at the fourth welding speed with the welding gun angled at 40-50° to the base plate. When welding to the 1-3 o'clock position, place the nozzle at the 6-8 o'clock position, and use the 6-8 o'clock position as the fulcrum to weld the PD position at an upward angle. Weld at the fifth welding speed until the 12 o'clock position.

2. The welding method according to claim 1, characterized in that, The first welding speed is 5-6 mm / s.

3. The welding method according to claim 1, characterized in that, The second welding speed is 4-5 mm / s.

4. The welding method according to claim 1, characterized in that, The third welding speed is 6-7 mm / s.

5. The welding method according to claim 1, characterized in that, The fourth welding speed is 4-5 mm / s.

6. The welding method according to claim 1, characterized in that, The fifth welding speed is 6-7 mm / s.

7. The welding method according to claim 1, characterized in that, The welding conditions include: The diameter of the welding wire is 1.0-1.6mm; And / or, the composition of the gas is 98% Ar + 2% O2; And / or, the gas flow rate is 14-18 L / min.

8. The welding method according to claim 1, characterized in that, The welding parameters include: The welding current is 60-80A; And / or, the welding voltage is 16.8-18.4V.

9. The welding method according to claim 8, characterized in that, The distance between the center of the welding arc and the root of the base plate is 0.5-1.5mm.

10. The welding method according to claim 1, characterized in that, The thickness of the base material is 0.5-5mm.

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