I-shaped groove strip-shaped welding wire swing laser horizontal position welding system and welding method

Abstract

The invention provides an I-shaped groove strip-shaped welding wire swing laser horizontal position welding system and a welding method. The welding system comprises a front pressing mechanism, a swing laser mechanism and a rear wire feeding mechanism. The front pressing mechanism comprises a pressing roller, the swing laser mechanism outputs swing laser, the rear wire feeding mechanism comprises a wire feeding guide, and the wire feeding guide feeds strip-shaped welding wires. According to the welding method, the transverse welding seam of the I-shaped butt-joint groove of the low-carbon steel base metal is filled by adopting a front pressing roller, a middle swinging laser and a rear strip-shaped welding wire feeding mode. The capillary acting force and surface tension of molten pool metal are increased in the welding process, then downward flowing of the molten pool metal under the gravity effect is counteracted, downward-flowing-free welding of the low-carbon steel I-shaped groove butt joint transverse weld joint is achieved, the technical problem that liquid deposited metal downwards flows when the low-carbon steel (such as Q345NQR2 low-carbon steel) transverse butt joint weld joint is welded is solved, and the welding quality of the low-carbon steel I-shaped groove butt joint transverse weld joint is improved. And a new solution thought is provided for transverse welding seam welding in similar application scenes.

Description

Technical Field

[0001] This invention relates to the field of carbon steel welding technology, and more specifically, to an I-groove strip welding wire oscillating laser horizontal welding system and welding method. Background Technology

[0002] In the welding and manufacturing of train bodies, the challenge of welding transverse seams is a significant issue. For carbon steel train bodies, based on lightweight design requirements, a structural design of internal frame + external skin is typically adopted. Based on this structural design concept, welding between sheet metal becomes a crucial process in train body manufacturing. Specifically, the connections between window reinforcement beams, wall panels, and side columns are often designed with I-type welds for transverse butt joints.

[0003] Due to the need to control welding deformation in the vehicle body, a welding assembly method from the inside out is adopted. When welding the reinforcing beams between windows, wall panels, and side pillars is required, the vehicle body frame has already been basically welded. Due to the limitations of the vehicle body's length and weight, it is impossible to use a welding positioner to change the above-mentioned transverse welds to a horizontal position for welding. When welding the above-mentioned welds in a transverse position, the molten metal will run down due to gravity, which will seriously affect the appearance of the vehicle body.

[0004] Patent CN114012265A proposes a dual-beam laser arc composite single-sided horizontal welding method and device, which adopts a layout of TIG welding gun, first laser beam, second laser beam and GMAW welding gun to weld single-sided V-groove thick plate horizontal welds, reducing welding defects such as undercut, side wall melt nugget and porosity.

[0005] Patent CN110102898A discloses a laser scanning-TIG composite fusion welding method, which uses a TIG welding torch to heat the strip welding wire, uses an oscillating laser as the arc coupling energy, and uses laser scanning to stir the liquid metal in the molten pool, thereby prolonging the existence time of the liquid molten pool, which is conducive to the overflow of bubbles and inhibits the formation of crystallization cracks.

[0006] Pi Yadong et al. studied the asymmetric bevel design method with a small bevel angle on the upper side and a large bevel angle on the lower side, and used the laser-arc hybrid welding method (laser oscillation or no oscillation is acceptable) to weld the V-type or X-type butt welds of thick plates. See Pi Yadong, Wang Xinsheng, Wang Qin, et al. Microstructure and property analysis of laser-arc hybrid welded horizontal joints of 16Mn steel [J]. Welding Technology, 2015, 44(03):25-28+20.

[0007] In summary, none of the welding technologies disclosed in existing patents or literature can solve the technical problem of weld seam descent during the welding of transverse weld seams on carbon steel vehicle bodies.

[0008] In view of this, the present invention is hereby proposed. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing an I-groove strip welding wire oscillating laser horizontal welding system and welding method. By controlling the composition of the strip welding wire, optimizing the oscillating laser parameters, and adjusting the plate fitting gap, the capillary force and surface tension of the molten pool metal are increased, thereby counteracting the downward flow of the molten pool metal under the action of gravity, and realizing the non-downflow welding of the I-groove butt horizontal weld of low carbon steel.

[0010] In order to achieve the above-mentioned objectives of the present invention, the following technical solution is adopted: A type I bevel strip welding wire oscillating laser horizontal welding system includes a front clamping mechanism, an oscillating laser mechanism, and a rear wire feeding mechanism; the front clamping mechanism includes a clamping roller 2, the oscillating laser mechanism outputs an oscillating laser 3, and the rear wire feeding mechanism includes a wire feeding guide 5, which feeds the strip welding wire 4.

[0011] Furthermore, the distance h1 between the pressing roller 2 and the oscillating laser 3 is 30~50mm.

[0012] Furthermore, the distance between the strip welding wire 4 and the oscillating laser 3 is 0, and the strip welding wire 4 is located directly below the laser beam of the oscillating laser 3.

[0013] Furthermore, the included angle θ between the wire feeding guide 5 and the base material is 45~60°.

[0014] Furthermore, the pressing roller 2 presses the base materials to be welded on both sides, and makes the gap between the base material to be welded and the plate of the back base material 7 ≤ 0.15mm.

[0015] The welding method of the above-mentioned I-type groove strip welding wire oscillating laser horizontal welding system uses a front clamping roller 2, a middle oscillating laser 3, and a rear strip welding wire 4 to fill the I-type butt groove horizontal weld of low carbon steel base material.

[0016] Furthermore, the thickness of the low-carbon steel base material to be welded is 3~6mm; the form of the type I butt groove is: groove width 3~6mm, groove depth is the same as the thickness of the low-carbon steel base material to be welded.

[0017] Furthermore, the transverse welding speed of the oscillating laser 3 is 800mm / min~1200mm / min, and the feeding speed of the strip welding wire 4 is 3000~5000mm / min; the laser power of the oscillating laser 3 is 1200~1800W, the oscillating laser trajectory is sawtooth-shaped, the oscillation frequency is 3~6Hz, and the laser reciprocating oscillation amplitude is consistent with the bevel width.

[0018] Furthermore, the strip welding wire 4 has a width of 2~5mm and a thickness of 0.5~1mm; the composition of the strip welding wire 4 includes: 24~26wt% manganese, 9~11wt% nickel, and the balance is copper.

[0019] Furthermore, it includes the following steps: Step S1: Pretreatment of the base material surface; Step S2, Tack welding assembly: Use welding wire with the same composition as the actual welding wire; Step S3, Welding: The horizontal weld seam of the low carbon steel I-type butt joint is filled by using a front clamping roller, a middle oscillating laser, and a rear strip welding wire feeding method. Step S4, Trajectory Repetition: Keeping the process parameters set in step S3 unchanged, repeat the above trajectory 4 to 6 times along the transverse direction of the weld until the bevel is filled.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention relates to a type I groove strip welding wire oscillating laser horizontal welding system and welding method, which, based on the technical advantage of the laser heat source having rapid heating and movement, increases the capillary force and surface tension of the molten pool metal by controlling the composition of the strip welding wire, optimizing the oscillating laser parameters, and adjusting the plate fitting gap, thereby counteracting the downward flow of the molten pool metal under the action of gravity, and realizing the non-downflow welding of the type I groove butt horizontal weld of low carbon steel.

[0021] 2. In the Type I bevel strip welding wire oscillating laser horizontal welding system of the present invention, the rollers placed at the front of the welding press the base materials to be welded on both sides, so that the gap between the plates is ≤0.15mm. Under this gap, the capillary action of the liquid will promote the spread of the liquid weld metal.

[0022] 3. The oscillating laser of this invention reduces the excessive heat input to the liquid metal in the weld, and the high welding speed of laser welding also effectively reduces the existence time of the liquid metal, that is, shortens the time of gravity action.

[0023] 4. The present invention uses a strip welding wire with copper, manganese and nickel composition. Compared with ordinary carbon steel welding wire, the surface tension can promote its wetting and spreading in low carbon steel (such as Q345NQR2 low carbon steel), which is equivalent to reducing the volume of liquid weld metal. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the type I bevel strip welding wire oscillating laser horizontal welding process of the present invention; Figure 2 This is a schematic diagram showing the oscillating laser trajectory and the relative position between the strip welding wire and the oscillating laser in this invention. Explanation of reference numerals in the attached diagram: 1. Upper base material; 2. Pressing roller; 3. Oscillating laser; 4. Strip welding wire; 5. Wire feeding guide; 6. Lower base material; 7. Back base material. Detailed Implementation

[0026] The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0027] A type I bevel strip welding wire oscillating laser horizontal welding system includes a front clamping mechanism, an oscillating laser mechanism, and a rear wire feeding mechanism; the front clamping mechanism includes clamping rollers 2 for clamping the base material on both sides of the horizontal weld; the oscillating laser mechanism outputs an oscillating laser 3; the rear wire feeding mechanism includes a wire feeding guide 5, which feeds strip welding wire 4 as filler wire.

[0028] Preferably, the distance h1 between the pressing roller 2 and the oscillating laser 3 is 30~50mm (including but not limited to 30mm, 35mm, 40mm, 45mm, 50mm).

[0029] Preferably, the distance between the strip welding wire 4 and the oscillating laser 3 is 0, and the strip welding wire 4 is located directly below the laser beam of the oscillating laser 3.

[0030] Preferably, the included angle θ between the wire feeding guide 5 and the base material is 45~60°, including but not limited to 45°, 50°, 55°, and 60°.

[0031] Preferably, the pressing roller 2 presses the base materials to be welded on both sides, and makes the gap between the base material to be welded and the plate of the back base material 7 ≤ 0.15mm. Under this gap, the capillary action of the liquid will promote the spread of the liquid weld metal.

[0032] Preferably, the base material to be welded includes an upper base material 1 and a lower base material 6, and the back base material 7 is disposed on the back of the upper base material 1 and the lower base material 6 to support the molten welding material.

[0033] Preferably, the upper substrate 1, the lower substrate 6, and the back substrate 7 are made of the same material.

[0034] The welding method of the above-mentioned I-type groove strip welding wire oscillating laser horizontal welding system uses a front clamping roller 2, a middle oscillating laser 3, and a rear strip welding wire 4 to fill the I-type butt groove horizontal weld of low carbon steel base material.

[0035] Preferably, the thickness of the low-carbon steel base material to be welded is 3~6mm (including but not limited to 3mm, 4mm, 5mm, 6mm); the preferred low-carbon steel base material to be welded is Q345NQR2 low-carbon steel.

[0036] Preferably, the type I butt groove has the following characteristics: groove width of 3~6mm (including but not limited to 3mm, 4mm, 5mm, 6mm), and groove depth is the same as the thickness of the low carbon steel base material to be welded.

[0037] Preferably, the transverse welding speed of the oscillating laser 3 is 800 mm / min to 1200 mm / min (including but not limited to 800 mm / min, 900 mm / min, 1000 mm / min, 1100 mm / min, and 1200 mm / min), and the feed speed of the strip welding wire 4 is 3000 to 5000 mm / min (including but not limited to 3000 mm / min, 3500 mm / min, 4000 mm / min, 4500 mm / min, and 5000 mm / min).

[0038] Preferably, the laser power of the oscillating laser 3 is 1200~1800W (including but not limited to 1200W, 1300W, 1400W, 1500W, 1600W, 1700W, 1800W), the oscillating laser trajectory is sawtooth-shaped, the oscillation frequency is 3~6Hz (including but not limited to 3Hz, 4Hz, 5Hz, 6Hz), and the laser reciprocating oscillation amplitude is consistent with the bevel width.

[0039] Preferably, the angle between the center line of the oscillation trajectory of the oscillating laser 3 and the base material is 90°.

[0040] The oscillating laser reduces the excessive heat input to the liquid metal in the weld, while the high welding speed of laser welding also effectively reduces the existence time of the liquid metal, that is, shortens the time of gravity action.

[0041] Preferably, the width of the strip welding wire 4 is 2~5mm (including but not limited to 2mm, 3mm, 4mm, 5mm), and the thickness is 0.5~1mm (including but not limited to 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm).

[0042] Preferably, the strip welding wire 4 comprises: 24-26 wt% manganese, 9-11 wt% nickel, and the balance being copper. Using a copper-manganese-nickel strip welding wire, compared to ordinary carbon steel welding wire, allows for better surface tension, promoting wetting and spreading in low-carbon steel, effectively reducing the volume of the liquid weld metal.

[0043] Preferably, the welding method includes the following steps: Step S1, Pre-treatment of base material surface: Use mechanical grinding to grind the bevel of the base material to be welded and the metal surface within a range of 30~50mm on both sides until the metal luster is exposed; Step S2, Tack Welding Assembly: Position the workpiece along its length on both sides of the bevel; the tack weld length is 10-15mm, and the welding wire used has the same composition as the formal welding wire, namely 24-26wt% manganese, 9-11wt% nickel, and the balance copper. After tack welding, inspect the assembly quality of the product to ensure the process requirements of I-bevel and 3-6mm width are met; Step S3, Welding: As Figure 1 As shown, a method of front-mounted clamping rollers, middle-mounted oscillating laser, and rear-mounted strip welding wire feeding is used to fill the transverse weld of the I-type butt joint of low carbon steel, with a strip welding wire of 0.5~1mm thickness and 2~5mm width as the filler wire. Adjust the distance h1 between the clamping roller and the oscillating laser to 30~50mm, with the strip welding wire positioned directly below the laser beam (0mm spacing), the angle between the center line of the laser beam oscillation trajectory and the base material to 90°, and the angle between the wire feeding guide and the base material to 45~60°; set the lateral welding speed of the oscillating laser to 800mm / min~1200mm / min, the strip welding wire feeding speed to 3000~5000mm / min, the laser power to 1200~1800W, the oscillating laser trajectory to be sawtooth-shaped, and the oscillation frequency to 3~6Hz; Step S4, Trajectory Repetition: Keeping the process parameters set in step S3 unchanged, repeat the above trajectory 4 to 6 times along the transverse direction of the weld until the bevel is filled.

[0044] After welding, the final cover layer weld formation was visually inspected 100%. The weld was continuous and transitioned evenly to the base material. The weld reinforcement was measured to be between 1 and 2 mm. The weld surface was uniformly golden yellow with no abnormal overheating or blackening areas. The weld and heat-affected zone were basically clean with no weld slag or spatter residue.

[0045] Since the weld of this invention is not a working weld but only an appearance weld, the weld formation was only visually inspected.

[0046] Example 1 A laser horizontal welding process for I-groove strip welding wire with oscillation, the specific steps of which are as follows: S1) Surface pretreatment of base material: Mechanical grinding is used to grind the bevel of the Q345NQR2 low carbon steel to be welded and the metal surface within 50mm on both sides until the metal luster is exposed. S2) Tack welding assembly: Position the workpiece along its length on both sides of the bevel; the tack weld length is 10~15mm, and the welding wire used has the same composition as the formal welding wire, both being 25wt% manganese, 10wt% nickel, and the balance copper. After tack welding, inspect the assembly quality of the product to ensure the process requirements of I-bevel and 3mm width are met; S3) Welding: such as Figure 1 As shown, a method of front-mounted clamping roller, middle-mounted oscillating laser, and rear-mounted strip welding wire is used to fill the transverse weld of the I-type butt groove of Q345NQR2 low carbon steel, with a strip welding wire of 0.5mm thickness and 2mm width as the filler wire. Adjust the distance h1 between the clamping roller and the oscillating laser to 30mm, with the strip welding wire positioned directly below the laser beam (0mm spacing), the angle between the center line of the laser beam oscillation trajectory and the base material to 90°, and the angle between the wire feeding guide and the base material to 45°; set the oscillating laser transverse welding speed to 800mm / min, the strip welding wire feeding speed to 3000mm / min, the laser power to 1200W, the oscillating laser trajectory to be sawtooth-shaped, and the oscillation frequency to 3Hz; S4) Trajectory Repetition: Keep the process parameters set in S3 unchanged, repeat the above trajectory 6 times along the transverse direction of the weld until the bevel is filled.

[0047] Visual inspection after welding revealed that the weld formation of the final cover layer was continuous and uniformly transitioned to the base material. The weld reinforcement was measured to be between 1 and 2 mm. The weld surface was uniformly golden yellow with no abnormal overheating or blackening areas. The weld and heat-affected zone were basically clean with no slag or spatter residue.

[0048] Example 2 A laser horizontal welding process for I-groove strip welding wire with oscillation, the specific steps of which are as follows: S1) Surface pretreatment of base material: Mechanical grinding is used to grind the bevel of the Q345NQR2 low carbon steel to be welded and the metal surface within a range of 30~50mm on both sides until the metal luster is exposed. S2) Tack welding assembly: Position the workpiece along its length on both sides of the bevel; the tack weld length is 10~15mm, and the welding wire used has the same composition as the formal welding wire, both being 25wt% manganese, 10wt% nickel, and the balance copper. After tack welding, inspect the assembly quality of the product to ensure the process requirements of I-bevel and 6mm width are met; S3) Welding: such as Figure 1 As shown, the transverse weld of the I-type butt groove of Q345NQR2 low carbon steel is filled by a front clamping roller, a middle oscillating laser, and a rear strip welding wire feeding method. A strip welding wire with a thickness of 1mm and a width of 5mm is used as the filler wire. Adjust the distance h1 between the clamping roller and the laser to 50mm, with the strip welding wire positioned directly below the laser beam (0mm spacing), the angle between the center line of the laser beam's oscillation trajectory and the base material to 90°, and the angle between the wire feeding guide and the base material to 60°; set the oscillating laser transverse welding speed to 1200mm / min, the strip welding wire feeding speed to 5000mm / min, the laser power to 1800W, the oscillating laser trajectory to be sawtooth-shaped, and the oscillation frequency to 6Hz; S4) Trajectory Repetition: Keep the process parameters set in S3 unchanged, repeat the above trajectory 6 times along the transverse direction of the weld until the bevel is filled.

[0049] Visual inspection of the final cover layer weld formation after welding; the inspection results show that the weld is continuous and uniformly transitions to the base material, and the weld reinforcement is measured to be between 1 and 2 mm; the weld surface is uniformly golden yellow, with no abnormal overheating blackening areas, and the weld and heat-affected zone surfaces are basically clean, with no weld slag or spatter residue.

[0050] Comparative Example 1 A gas-shielded horizontal welding process for Q345NQR2 with type I bevel, the specific steps of which are as follows: S1) Surface pretreatment of base material: Mechanical grinding is used to grind the bevel and the metal within 50mm on both sides of the Q345NQR2 low carbon steel to be welded until the metal luster is exposed. S2) Tack welding assembly: Tack weld the Q345NQR2 low carbon steel workpieces to be welded. The length of the tack weld is 10~15mm. The welding wire used is the same as the welding wire used for the root pass of the formal weld, which is ER50S-G solid carbon steel welding wire. After tack welding, check the assembly quality of the product to ensure the process requirements of I-groove and 4mm width are met. S3) Welding: Using ER50S-G diameter filler wire, set welding current 210A, welding voltage 23V, welding speed 240mm / min, fill the transverse weld of the I-type butt groove of Q345NQR2 low carbon steel.

[0051] The inspection revealed that the upper toe of the weld (near the fusion line of the upper base metal) was a continuous and uniform groove; the lower toe of the weld had a local protrusion, the weld edge transitioned sharply to the base metal, and there were traces of complete non-fusion, which require further post-processing.

[0052] S4) Weld grinding: Workers use an angle grinder to grind the weld metal flowing down the lower side of the horizontal weld until all surfaces are flat and uniform; S5) Inspection: The flatness of the weld after grinding is inspected by the pallet gauge and visual inspection.

[0053] Comparative Example 2 A non-oscillating laser horizontal welding process for type I bevel strip welding wire, the specific steps of which are as follows: S1) Surface pretreatment of base material: Mechanical grinding is used to grind the bevel of the Q345NQR2 low carbon steel to be welded and the metal surface within a range of 30~50mm on both sides until the metal luster is exposed. S2) Tack welding assembly: Position the workpiece along its length on both sides of the bevel; the tack weld length is 10~15mm, and the welding wire used has the same composition as the formal welding wire, both being 25wt% manganese, 10wt% nickel, and the balance copper. After tack welding, inspect the assembly quality of the product to ensure the process requirements of I-bevel and 6mm width are met; S3) Welding: such as Figure 1 As shown, the transverse weld of the I-type butt groove of Q345NQR2 low carbon steel is filled by a front clamping roller, a middle laser, and a rear strip welding wire feeding method. A strip welding wire with a thickness of 1mm and a width of 5mm is used as the filler wire. Adjust the distance h1 between the clamping roller and the laser to 50mm, with the strip welding wire positioned directly below the laser beam (0mm spacing), and the angle between the wire guide and the base material to 60°; set the laser transverse welding speed to 1200mm / min, the strip welding wire feed speed to 5000mm / min, and the laser power to 1800W. S4) Trajectory Repetition: Keep the process parameters set in S3 unchanged, repeat the above trajectory 6 times along the transverse direction of the weld until the bevel is filled.

[0054] Post-weld visual inspection revealed that the final capping layer weld formation was continuous and uniformly transitioned to the base metal, with the weld reinforcement measured to be between 1 and 2 mm. The weld surface exhibited a uniform golden-yellow color, with no abnormal overheating or blackening areas. The weld and heat-affected zone surfaces were generally clean, with no weld slag or spatter residue. Visual inspection of the final cover layer weld formation after welding; the inspection results show that the weld is not fully filled on the upper side of the bevel, and the weld reinforcement is inclined downward relative to the center line of the bevel; the weld surface is uniformly golden yellow, with no abnormal overheating blackening areas, and the surface of the weld and heat-affected zone is basically clean, with no weld slag or spatter residue.

[0055] While the embodiments disclosed in this invention are as described above, their content is merely for the purpose of facilitating understanding of the technical solutions of this invention and is not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and changes to the form and details of the implementation without departing from the core technical solutions disclosed in this invention; however, the scope of protection defined by this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A type I bevel strip welding wire oscillating laser horizontal welding system, characterized in that, It includes a front clamping mechanism, a swing laser mechanism and a rear wire feeding mechanism; the front clamping mechanism includes a clamping roller (2), the swing laser mechanism outputs a swing laser (3), and the rear wire feeding mechanism includes a wire feeding guide (5), which feeds in a strip welding wire (4).

2. The type I bevel strip welding wire oscillating laser horizontal welding system according to claim 1, characterized in that, The distance h1 between the pressing roller (2) and the oscillating laser (3) is 30~50mm.

3. The type I bevel strip welding wire oscillating laser horizontal welding system according to claim 2, characterized in that, The distance between the strip welding wire (4) and the oscillating laser (3) is 0, and the strip welding wire (4) is located directly below the laser beam of the oscillating laser (3).

4. The type I bevel strip welding wire oscillating laser horizontal welding system according to claim 3, characterized in that, The included angle θ between the wire feeding guide (5) and the base material is 45~60°.

5. The type I bevel strip welding wire oscillating laser horizontal welding system according to claim 1, characterized in that, The pressing roller (2) presses the base material to be welded on both sides and makes the gap between the base material to be welded and the back base material (7) less than 0.15mm.

6. The welding method of the I-groove strip welding wire oscillating laser horizontal welding system as described in any one of claims 1 to 5, characterized in that, The transverse weld of the I-type butt groove of the low carbon steel base material is filled by using a front-mounted clamping roller (2), a middle oscillating laser (3), and a rear-mounted strip welding wire (4).

7. The welding method of the type I bevel strip welding wire oscillating laser horizontal welding system according to claim 6, characterized in that, The thickness of the low-carbon steel base material to be welded is 3~6mm; the form of the type I butt groove is: groove width 3~6mm, groove depth is the same as the thickness of the low-carbon steel base material to be welded.

8. The welding method of the type I bevel strip welding wire oscillating laser horizontal welding system according to claim 6, characterized in that, The transverse welding speed of the oscillating laser (3) is 800 mm / min to 1200 mm / min, and the feeding speed of the strip welding wire (4) is 3000 to 5000 mm / min. The laser power of the oscillating laser (3) is 1200 to 1800 W, the oscillating laser trajectory is sawtooth, the oscillation frequency is 3 to 6 Hz, and the laser reciprocating oscillation amplitude is consistent with the bevel width.

9. The welding method of the type I bevel strip welding wire oscillating laser horizontal welding system according to claim 6, characterized in that, The strip welding wire (4) has a width of 2~5mm and a thickness of 0.5~1mm; the composition of the strip welding wire (4) includes: 24~26wt% manganese, 9~11wt% nickel, and the balance is copper.

10. The welding method of the type I bevel strip welding wire oscillating laser horizontal welding system according to claim 6, characterized in that, Includes the following steps: Step S1: Pretreatment of the base material surface; Step S2, Tack welding assembly: Use welding wire with the same composition as the actual welding wire; Step S3, Welding: The horizontal weld seam of the low carbon steel I-type butt joint is filled by using a front clamping roller, a middle oscillating laser, and a rear strip welding wire feeding method. Step S4, Trajectory Repetition: Keeping the process parameters set in step S3 unchanged, repeat the above trajectory 4 to 6 times along the transverse direction of the weld until the bevel is filled.

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