Metal piece welding device

Abstract

The invention belongs to the technical field of metal part machining equipment, and particularly relates to a metal part welding device which comprises a straight seam welding machine body, a linear driving assembly and a connecting plate, and a fixing assembly is arranged at the left end of the straight seam welding machine body; the welding mechanism comprises a mounting seat mounted on the connecting plate, and a welding head is mounted on the mounting seat; the auxiliary mechanism comprises an air injection part rotationally arranged on the outer ring of the welding head, and a driving part and a cooling part are further fixedly installed on the welding head; and the preheating mechanism comprises a gas conveying part arranged on the side face of the straight seam welding machine body, plugging parts are arranged on the top face of the straight seam welding machine body in an array distribution mode, and a control part is arranged on the mounting base. By integrating inert gas protection, efficient cooling and intelligent preheating functions, the welding quality and production safety are remarkably improved, and meanwhile the high-precision and efficient automatic welding process is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal parts processing equipment, and in particular relates to a metal parts welding device. Background Art

[0002] With the development of industry, the welding of metal parts (cylinders, pipes, etc.) occupies an extremely important position in the manufacturing industry. It is widely used in machinery manufacturing, automobile manufacturing, aerospace, construction and other fields. With the advancement of science and technology and the improvement of industrial demand, the requirements for welding quality and efficiency are getting higher and higher. Although traditional welding methods such as manual arc welding and gas welding are widely used, they have many shortcomings in accuracy, efficiency and automation.

[0003] Straight seam welding machine is an automatic welding equipment that can automatically complete the straight seam of welding workpieces through automation and mechanization. Straight seam welding machine is also called straight seam automatic welding machine and longitudinal seam automatic welding machine, which is a kind of automatic welding machine. It can replace a large number of manual labor, greatly improve production efficiency and welding quality, reduce labor costs, and improve the working environment of welders. It is widely used in the metal products manufacturing industry, especially for welding work that requires long straight seams such as cylinders and pipes. It can efficiently and stably complete the welding task of long straight seams, and can adapt to the welding needs of different specifications and materials.

[0004] However, existing straight seam welding equipment still faces some challenges in practical application, the first of which is how to effectively protect the welding area from oxidation and other possible impurities. This is not only related to the appearance quality of the welded parts, but also directly affects the strength and durability of the welded joint.

[0005] In addition, how to achieve effective cooling of the weld during the welding process is also a problem that needs to be solved, because improper cooling may cause deformation of the welding part, which in turn affects the stability and safety of the entire structure.

[0006] At the same time, in order to further improve the welding quality, it is also necessary to consider how to effectively preheat the parts to be welded. Proper preheating can improve the fluidity of the molten pool and reduce welding defects such as cracks and pores, thereby ensuring the high quality and reliability of the welded joint.

[0007] Based on the above problems, this application document proposes a metal welding device to improve the above problems. Summary of the invention

[0008] The purpose of the present invention is to provide a metal welding device, which significantly improves the welding quality and production safety by integrating inert gas protection, efficient cooling and intelligent preheating functions, and at the same time realizes a high-precision and efficient automated welding process.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A metal welding device comprises a straight seam welding machine body, wherein a linear drive assembly is arranged at the upper end of the straight seam welding machine body, a connecting plate is installed on the linear drive assembly, and a fixing assembly is arranged at the left end of the straight seam welding machine body;

[0011] A welding mechanism, the welding mechanism comprising a mounting seat mounted on the connecting plate, the mounting seat being mounted with a welding head;

[0012] An auxiliary mechanism, the auxiliary mechanism comprising an air jet portion rotatably arranged on the outer ring of the welding head, and a driving portion and a cooling portion are also fixedly mounted on the welding head;

[0013] A preheating mechanism, wherein the preheating mechanism comprises a gas delivery portion arranged on the side of the straight seam welding machine body, a blocking portion is arranged in an array on the top surface of the straight seam welding machine body, and a control portion is arranged on the mounting seat;

[0014] During welding, the inert gas is fed into the driving part to drive the jet part to rotate, and the inert gas is fed into the jet part along the driving part. The rotation of the jet part drives the cooling part to operate and cool the weld.

[0015] In a preferred embodiment, the jet part includes a first annular air pipe, which is rotatably connected to a welding head, a second annular air pipe is rotatably connected to the first annular air pipe, and the second annular air pipe is fixedly connected to the welding head by a support rod, the first annular air pipe and the second annular air pipe are interconnected, the bottom surface of the first annular air pipe is connected to the jet pipe in an annular shape, and the top surface of the first annular air pipe is fixedly connected to a gear ring.

[0016] In a preferred embodiment, the driving part includes a hollow cylinder, which is fixedly connected to the welding head, and a first round rod is rotatably connected to the hollow cylinder, one end of the first round rod is fixedly connected to a first gear, and the other end of the first round rod is fixedly connected to a wind wheel, an air pipe is connected to the hollow cylinder, and the other end of the air pipe is connected to a second annular air pipe, and the upper end of the hollow cylinder is connected to an air inlet pipe.

[0017] In a preferred embodiment, the cooling part includes a ventilation hood, which is fixedly connected to the welding head, and a second round rod is rotatably connected to the ventilation hood, one end of the second round rod is connected to a fan blade, the other end of the second round rod is connected to a second gear, and the ventilation hood is connected to an air outlet pipe.

[0018] In a preferred embodiment, the gas delivery part includes a hot air blower, which is installed on the side of the straight seam welding machine body, and is connected to a hot air duct. Two gas storage grooves are provided at the left end of the straight seam welding machine body, and the gas storage grooves are connected to the hot air duct, and the gas storage grooves are connected to the exhaust pipes in an array.

[0019] In a preferred embodiment, the blocking part includes a blocking block, which is arranged at the air inlet end of the exhaust pipe. The top surface of the blocking block is connected to a guide rod, and the guide rod penetrates to the outside of the air storage groove. The upper end of the guide rod is fixedly connected to a force-bearing plate, and the force-bearing plate is connected to a compression spring, and the other end of the compression spring is connected to the top surface of the straight seam welding machine body.

[0020] In a preferred embodiment, the control part includes a bracket, which is fixedly connected to a mounting seat, a mounting plate is fixedly connected to the lower end of the bracket, a threaded rod is threadedly connected to the mounting plate, a resistance member is rotatably connected to the lower end of the threaded rod, a limiting rod is fixedly connected to the top surface of the resistance member, and the limiting rod and the mounting plate are slidably connected.

[0021] In a preferred embodiment, the abutment member comprises a pressing plate, which is fixedly connected to the lower end of the limiting rod and rotatably connected to the threaded rod, an extension plate is slidably connected to the pressing plate, and a fastening bolt is provided on the pressing plate.

[0022] In a preferred embodiment, the inner diameter of the outlet end of the air outlet pipe shows a gradually decreasing trend.

[0023] The technical effects achieved by the present invention are:

[0024] The present invention introduces a rotating jet part to form a protective air curtain of inert gas during the welding process, effectively isolating the welding area from the surrounding air and preventing oxygen, moisture and other impurities from invading the molten pool. This design not only improves the appearance quality of the weld, but more importantly, enhances the strength and durability of the welded joint, reduces the probability of welding defects such as pores and cracks, and ensures the safety and reliability of the welded structure;

[0025] The design of the cooling part of the present invention realizes effective cooling of the welding part. This part uses rotating fan blades to inhale external air and discharge it through the air outlet pipe, which accelerates heat dissipation. In particular, the design of the gradually narrowing inner diameter of the outlet end of the air outlet pipe increases the exhaust speed and reduces the gas temperature according to the principle of the Bernoulli equation, further enhancing the cooling effect. This helps to avoid welding deformation problems caused by improper cooling and ensures the overall stability and safety of the welded structure;

[0026] The gas delivery part and the plugging part in the preheating mechanism of the present invention are combined with the work of the control part to provide a set of intelligent preheating solutions. The hot air generated by the hot air blower can achieve accurate preheating of welds at different positions. In addition, the adjustable length extension plate allows the preheating time to be adjusted according to actual needs to meet the welding requirements of different materials and thicknesses. Proper preheating reduces welding stress and improves the fluidity of the molten pool, thereby further improving welding efficiency and weld quality, so that the equipment can be widely used in high-precision welding tasks of various metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a partial structural schematic diagram of the welding mechanism and auxiliary mechanism of the present invention;

[0029] Figure 3 It is a schematic diagram of the internal structure of the hollow cylinder of the present invention;

[0030] Figure 4 It is a schematic diagram of the internal structure of the ventilation hood of the present invention;

[0031] Figure 5 The present invention Figure 1 A cross-sectional view of

[0032] Figure 6 The present invention Figure 5 An enlarged schematic diagram of part A shown in FIG.

[0033] Figure 7 It is a structural schematic diagram of the blocking portion of the present invention;

[0034] Figure 8 It is a structural schematic diagram of the control unit of the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0036] 1. Straight seam welding machine body; 2. Linear drive assembly; 3. Connecting plate; 4. Welding mechanism; 5. Auxiliary mechanism; 6. Preheating mechanism; 7. Fixing assembly;

[0037] 41. Mounting seat; 42. Welding head;

[0038] 51. Jet unit; 52. Driving unit; 53. Cooling unit;

[0039] 511, first annular air pipe; 512, second annular air pipe; 513, jet pipe; 514, gear ring;

[0040] 521, hollow cylinder; 522, first round rod; 523, first gear; 524, wind wheel; 525, air transmission pipe; 526, air inlet pipe;

[0041] 531, ventilation hood; 532, second round rod; 533, fan blade; 534, second gear; 535, air outlet pipe;

[0042] 61. Gas transmission unit; 62. Blocking unit; 63. Control unit;

[0043] 611, hot air blower; 612, hot air duct; 613, air storage tank; 614, exhaust pipe;

[0044] 621, blocking block; 622, guide rod; 623, force plate; 624, compression spring;

[0045] 631, bracket; 632, mounting plate; 633, threaded rod; 634, resistance member; 635, limit rod;

[0046] 6341. Pressing plate; 6342. Extension plate; 6343. Fastening bolt. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0049] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" that appears in different places in this specification does not refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

[0050] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0051] Please see attached Figures 1 to 8 As shown, this embodiment provides a metal welding device, including a straight seam welding machine body 1, a linear drive assembly 2 is arranged at the upper end of the straight seam welding machine body 1, a connecting plate 3 is installed on the linear drive assembly 2, and a fixing assembly 7 is arranged at the left end of the straight seam welding machine body 1;

[0052] The welding mechanism 4 includes a mounting seat 41 mounted on the connecting plate 3, and a welding head 42 is mounted on the mounting seat 41;

[0053] Auxiliary mechanism 5, the auxiliary mechanism 5 includes an air jet part 51 rotatably arranged on the outer ring of the welding head 42, and a driving part 52 and a cooling part 53 are also fixedly mounted on the welding head 42;

[0054] The preheating mechanism 6 includes a gas supply part 61 arranged on the side of the straight seam welding machine body 1, a blocking part 62 is arranged in an array on the top surface of the straight seam welding machine body 1, and a control part 63 is arranged on the mounting seat 41;

[0055] During welding, the inert gas is fed into the driving part 52 to drive the jet part 51 to rotate, and the inert gas is fed into the jet part 51 along the driving part 52. The rotation of the jet part 51 causes the cooling part 53 to operate to cool the weld.

[0056] In this embodiment, the fixing assembly 7 is used to clamp and fix the metal parts to be welded, the linear drive assembly 2 is started to move the connecting plate 3 and the welding mechanism 4 along the direction of the metal parts joint, and then the welding head 42 is started to laser weld the metal parts joint.

[0057] It should be noted that the fixing assembly 7 and the linear drive assembly 2 are existing structures on the main body 1 of the straight seam welding machine, and both adopt products currently available on the market. When selecting, the specifications and usage scenarios should be suitable, and the requirements of this application should be met as much as possible. The specific model specifications are not limited here;

[0058] The function of the fixing assembly 7 is to fix the metal piece to be welded; the function of the linear drive assembly 2 is to drive the welding head 42 to move along the gap of the metal piece to be welded to perform the welding operation.

[0059] Next, please refer to Figure 2The jet part 51 includes a first annular air pipe 511, which is rotatably connected to the welding head 42. The first annular air pipe 511 is rotatably connected to the second annular air pipe 512, and the second annular air pipe 512 is fixedly connected to the welding head 42 by a support rod. The first annular air pipe 511 and the second annular air pipe 512 are connected to each other, and the bottom surface of the first annular air pipe 511 is connected to the jet pipe 513 in an annular shape, and the top surface of the first annular air pipe 511 is fixedly connected to the gear ring 514.

[0060] In this embodiment, the first annular air pipe 511 is rotatably connected to the second annular air pipe 512, and the second annular air pipe 512 is fixedly connected to the welding head 42. During the rotation of the first annular air pipe 511, it will not cause the rotation of the second annular air pipe 512, thereby ensuring the smoothness of gas circulation.

[0061] Secondly, please refer to Figure 3 The driving part 52 includes a hollow cylinder 521, which is fixedly connected to the welding head 42. A first round rod 522 is rotatably connected to the hollow cylinder 521. One end of the first round rod 522 is fixedly connected to a first gear 523, and the other end of the first round rod 522 is fixedly connected to a wind wheel 524. An air pipe 525 is connected to the hollow cylinder 521, and the other end of the air pipe 525 is connected to the second annular air pipe 512. An air inlet pipe 526 is connected to the upper end of the hollow cylinder 521.

[0062] In this embodiment, during the welding process, inert gas is pumped into the hollow cylinder 521 through the air inlet pipe 526, and then the gas flows into the second annular air pipe 512 through the air delivery pipe 525, and enters the first annular air pipe 511, and finally ejected from the air jet pipe 513; at the same time, the pumped gas drives the wind wheel 524 to rotate, and the rotation of the wind wheel 524 drives the first round rod 522 to rotate, thereby rotating the first gear 523, and the first gear 523 is engaged with the ring gear 514, so as to cause the first annular air pipe 511 and the air jet pipe 513 to rotate, and the gas is ejected through the annularly distributed air jet pipe 513, and rotates around the welding head 42 during the ejection process, so as to achieve uniform gas release and form a protective gas curtain, which isolates the welding area from the surrounding air, prevents oxygen, moisture and other impurities from invading the molten pool, and avoids problems such as pores and cracks in the weld, thereby protecting the molten pool from oxidation.

[0063] Next, please refer to Figure 4 The cooling part 53 includes a ventilation hood 531, which is fixedly connected to the welding head 42. A second round rod 532 is rotatably connected to the ventilation hood 531. A fan blade 533 is connected to one end of the second round rod 532, and a second gear 534 is connected to the other end of the second round rod 532. An air outlet pipe 535 is connected to the ventilation hood 531.

[0064] In this embodiment, the ring gear 514 meshes with the second gear 534 while rotating, causing the second round rod 532 to rotate. The rotation of the second round rod 532 drives the fan blades 533 to rotate, so that negative pressure is generated in the ventilation hood 531, and the outside air is sucked in. The air is then discharged through the exhaust pipe 535 to cool the weld, prevent deformation of the weld, and improve the welding quality.

[0065] In addition, the inner diameter of the outlet end of the gas outlet pipe 535 shows a trend of gradually decreasing. As the flow rate increases, according to the principle of thermodynamics, the temperature of the gas decreases when the velocity increases during the adiabatic process. This phenomenon can be explained by the Bernoulli equation, which shows that in an ideal fluid, the pressure decreases at the position where the flow rate increases. Therefore, as the inner diameter of the gas outlet pipe 535 decreases, the flow rate of the gas flow increases, thereby causing the temperature of the gas to decrease, thereby improving the heat dissipation effect.

[0066] Please refer again Figure 5 and Figure 6 The gas delivery part 61 includes a hot air blower 611, which is installed on the side of the straight seam welding machine body 1. The hot air blower 611 is connected to a hot air duct 612. Two gas storage grooves 613 are provided at the left end of the straight seam welding machine body 1, and the gas storage grooves 613 are connected to the hot air duct 612. The gas storage grooves 613 are connected to exhaust pipes 614 in an array.

[0067] In this embodiment, the hot air from the hot air blower 611 is input into the air storage tank 613 through the hot air duct 612, and finally output from the exhaust pipe 614 to preheat the welding part, reduce welding stress, and further improve welding efficiency and weld quality. With such a design, the straight seam welding machine can not only realize continuous and stable welding operations, but also adapt to the welding requirements of different materials and thicknesses, greatly expanding its application range.

[0068] Please refer again Figure 6 and Figure 7 The blocking portion 62 includes a blocking block 621, which is arranged at the air inlet end of the exhaust pipe 614. The top surface of the blocking block 621 is connected to a guide rod 622, and the guide rod 622 penetrates to the outside of the air storage groove 613. The upper end of the guide rod 622 is fixedly connected to a force plate 623, and a compression spring 624 is connected to the force plate 623, and the other end of the compression spring 624 is connected to the top surface of the straight seam welding machine body 1.

[0069] In this embodiment, the blocking block 621 is slidably connected in the air storage groove 613 and fits tightly with the air inlet end of the exhaust pipe 614 to control the closed state of the exhaust pipe 614. When the force plate 623 is squeezed by external force, the blocking block 621 is driven to move downward through the guide rod 622 and compress the compression spring 624. At this time, the hot air can be discharged along the exhaust pipe 614. When the force plate 623 is no longer squeezed, the restoring force of the compression spring 624 will cause the blocking block 621 to reset, thereby closing the air inlet end of the exhaust pipe 614 and preventing the hot air from being discharged through the exhaust pipe 614.

[0070] Please refer again Figure 8 The control part 63 includes a bracket 631, which is fixedly connected to the mounting seat 41. The lower end of the bracket 631 is fixedly connected to a mounting plate 632, and a threaded rod 633 is threadedly connected to the mounting plate 632. The lower end of the threaded rod 633 is rotatably connected to a resistance member 634, and the top surface of the resistance member 634 is fixedly connected to a limit rod 635, and the limit rod 635 and the mounting plate 632 are slidably connected.

[0071] In this embodiment, the height of the abutment 634 can be adjusted by rotating the threaded rod 633 , and the limiting rod 635 can play a guiding and limiting role to ensure the stability of the lifting and lowering of the abutment 634 .

[0072] Please refer again Figure 8 The resistance member 634 includes a pressing plate 6341, which is fixedly connected to the lower end of the limiting rod 635 and rotatably connected to the threaded rod 633. An extension plate 6342 is slidably connected to the pressing plate 6341, and a fastening bolt 6343 is provided on the pressing plate 6341.

[0073] In this embodiment, if the workpiece needs to be preheated before welding, the hot air blower 611 can be started, and hot air can be delivered to the gas storage tank 613 through the hot air duct 612; and the threaded rod 633 is rotated to drive the resistance member 634 to move downward. The resistance member 634 moves downward to press the force plate 623 to move downward therewith. The force plate 623 moves downward, driving the guide rod 622 and the blocking block 621 to move downward. At this time, the end of the exhaust pipe 614 loses its blockage, and the hot air in the gas storage tank 613 can be discharged along the exhaust pipe 614 and sprayed on the weld. The weld is preheated by hot air to improve the fluidity of the molten pool.

[0074] When the welding mechanism 4 moves, it will drive the resistance member 634 on the control part 63 to move. The resistance member 634 will press the force-bearing plate 623 at different positions during the movement, so that the port of the exhaust pipe 614 is unblocked, allowing the hot air to be discharged from the corresponding exhaust pipe 614 to preheat the weld.

[0075] The extension plate 6342 is slidably connected to the first pressing plate 6341. After removing the fastening bolt 6343, the extension plate 6342 can slide along the first pressing plate 6341 to adjust the length of the extension plate 6342 extending from the first pressing plate 6341. After adjustment, the fastening bolt 6343 can be re-tightened. By adjusting the telescopic length of the extension plate 6342, the preheating time can be adjusted.

[0076] Specifically, the longer the extension plate 6342 is extended, the earlier the force-bearing plate 623 will be pressed, and the pressing time will be prolonged, thereby increasing the preheating time; conversely, the shorter the extension plate 6342 is extended, the preheating time will be reduced accordingly.

[0077] The operating principle of the present invention is as follows:

[0078] Workpiece fixing and drive preparation:

[0079] The fixing assembly 7 on the straight seam welding machine body 1 is used to clamp and fix the metal piece to be welded to ensure that it remains stable during the welding process.

[0080] The linear drive assembly 2 is started, so that the connecting plate 3 and the welding mechanism 4 installed thereon can move along the direction of the metal joint, preparing for the subsequent automated welding operation.

[0081] Inert gas protection and cooling linkage:

[0082] Before or at the same time as the welding head 42 is started, an inert gas (such as argon) is pumped into the hollow cylinder 521 through the gas inlet pipe 526. As the gas flows in, it not only flows directly to the jet portion 51 for forming a protective gas curtain, but also drives the wind wheel 524 located in the hollow cylinder 521 to rotate.

[0083] The rotation of the wind wheel 524 drives the first round rod 522 and the first gear 523 connected thereto to rotate, and the first gear 523 meshes with the gear ring 514, causing the jet part 51 to rotate. This rotation action ensures that when the inert gas is ejected from the jet pipe 513, a uniformly distributed protective gas curtain can be formed around the welding head 42 to isolate oxygen and other impurities and prevent oxidation of the molten pool.

[0084] When the jet part 51 rotates, the ring gear 514 meshes with the second gear 534 in the cooling part 53, so that the second round rod 532 and the fan blade 533 rotate synchronously, generating negative pressure to inhale the outside air and discharge it through the air outlet pipe 535, thereby achieving effective cooling of the welding point and avoiding deformation caused by overheating.

[0085] Preheating system activated:

[0086] Before welding begins, if the workpiece needs to be preheated, the hot air blower 611 is started to deliver hot air to the air storage tank 613 through the hot air duct 612 .

[0087] The position of the resisting member 634 is adjusted by the control unit 63. When the resisting member 634 moves downward to contact and press the force-bearing plate 623, the blocking block 621 moves downward accordingly, opening the exhaust pipe 614 port to allow hot air to be discharged and preheat the weld. This step improves the fluidity of the molten pool, reduces the probability of welding defects, and improves welding efficiency.

[0088] Dynamic preheating regulation during welding:

[0089] When the welding mechanism 4 moves along the joint of the metal parts, the resistance member 634 on the control part 63 presses the force-bearing plate 623 at different positions according to the set path, so that the corresponding exhaust pipe 614 port is opened, thereby realizing dynamic preheating of the area to be welded.

[0090] By adjusting the extension length of the extension plate 6342, the preheating time and intensity can be flexibly adjusted according to actual needs to meet the welding requirements of different materials and thicknesses.

[0091] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A metal welding device, characterized in that: The invention comprises a straight seam welding machine body (1), wherein a linear drive assembly (2) is arranged at the upper end of the straight seam welding machine body (1), a connecting plate (3) is installed on the linear drive assembly (2), and a fixing assembly (7) is arranged at the left end of the straight seam welding machine body (1); A welding mechanism (4), the welding mechanism (4) comprising a mounting seat (41) mounted on the connecting plate (3), a welding head (42) being mounted on the mounting seat (41); An auxiliary mechanism (5), the auxiliary mechanism (5) comprising an air jet portion (51) rotatably arranged on the outer ring of a welding head (42), and a driving portion (52) and a cooling portion (53) are also fixedly mounted on the welding head (42); A preheating mechanism (6), the preheating mechanism (6) comprising a gas supply portion (61) arranged on the side of the straight seam welding machine body (1), a top surface of the straight seam welding machine body (1) being provided with blocking portions (62) distributed in an array, and a control portion (63) being provided on the mounting seat (41); During welding, an inert gas is fed into a driving part (52) to cause the driving part (52) to drive the jet part (51) to rotate, and the inert gas is fed into the jet part (51) along the driving part (52). The rotation of the jet part (51) causes the cooling part (53) to operate to cool the weld.

2. A metal welding device according to claim 1, characterized in that: The air injection portion (51) comprises a first annular air pipe (511), the first annular air pipe (511) is rotatably connected to the welding head (42), a second annular air pipe (512) is rotatably connected to the first annular air pipe (511), and the second annular air pipe (512) is fixedly connected to the welding head (42) by means of a support rod, the first annular air pipe (511) and the second annular air pipe (512) are interconnected, the bottom surface of the first annular air pipe (511) is connected to an air injection pipe (513) in an annular arrangement, and the top surface of the first annular air pipe (511) is fixedly connected to a gear ring (514).

3. A metal welding device according to claim 2, characterized in that: The driving part (52) comprises a hollow cylinder (521), the hollow cylinder (521) being fixedly connected to the welding head (42), a first round rod (522) being rotatably connected to the hollow cylinder (521), one end of the first round rod (522) being fixedly connected to a first gear (523), the other end of the first round rod (522) being fixedly connected to a wind wheel (524), an air supply pipe (525) being connected to the hollow cylinder (521), and the other end of the air supply pipe (525) being in communication with a second annular air pipe (512), and an upper end of the hollow cylinder (521) being connected to an air inlet pipe (526).

4. A metal welding device according to claim 1, characterized in that: The cooling part (53) comprises a ventilation hood (531), wherein the ventilation hood (531) is fixedly connected to the welding head (42), a second round rod (532) is rotatably connected to the ventilation hood (531), one end of the second round rod (532) is connected to a fan blade (533), the other end of the second round rod (532) is connected to a second gear (534), and the ventilation hood (531) is connected to an air outlet pipe (535).

5. A metal welding device according to claim 1, characterized in that: The gas delivery part (61) comprises a hot air blower (611), the hot air blower (611) is installed on the side of the straight seam welding machine body (1), the hot air blower (611) is connected to a hot air duct (612), the left end of the straight seam welding machine body (1) is provided with two gas storage grooves (613), and the gas storage grooves (613) are connected to the hot air duct (612), and the gas storage grooves (613) are connected to exhaust pipes (614) distributed in an array.

6. A metal welding device according to claim 5, characterized in that: The blocking portion (62) comprises a blocking block (621), which is arranged at the air inlet end of the exhaust pipe (614); the top surface of the blocking block (621) is connected to a guide rod (622), and the guide rod (622) penetrates to the outside of the air storage groove (613); the upper end of the guide rod (622) is fixedly connected to a force-bearing plate (623), and the force-bearing plate (623) is connected to a compression spring (624), and the other end of the compression spring (624) is connected to the top surface of the straight seam welding machine body (1).

7. A metal welding device according to claim 1, characterized in that: The control part (63) comprises a bracket (631), the bracket (631) is fixedly connected to the mounting seat (41), the lower end of the bracket (631) is fixedly connected to a mounting plate (632), a threaded rod (633) is threadedly connected to the mounting plate (632), the lower end of the threaded rod (633) is rotatably connected to a resistance member (634), the top surface of the resistance member (634) is fixedly connected to a limit rod (635), and the limit rod (635) and the mounting plate (632) are slidably connected.

8. A metal welding device according to claim 7, characterized in that: The resisting member (634) includes a pressing plate (6341), which is fixedly connected to the lower end of the limiting rod (635) and rotatably connected to the threaded rod (633), an extension plate (6342) is slidably connected to the pressing plate (6341), and a fastening bolt (6343) is provided on the pressing plate (6341).

9. A metal welding device according to claim 4, characterized in that: The inner diameter of the outlet end of the air outlet pipe (535) shows a trend of gradually decreasing.

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