Metal parts welding device

Abstract

The present invention belongs to the technical field of metal processing equipment, and specifically relates to a metal welding device, comprising a straight seam welding machine body, a linear drive assembly, and a connecting plate, wherein the left end of the straight seam welding machine body is provided with a fixed assembly; a welding mechanism, wherein the welding mechanism includes a mounting seat mounted on the connecting plate, and a welding head is mounted on the mounting seat; an auxiliary mechanism, wherein the auxiliary mechanism includes an air injection 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; and a preheating mechanism, wherein the preheating mechanism includes a gas supply portion arranged on the side of the straight seam welding machine body, a sealing portion is arranged in an array on the top surface of the straight seam welding machine body, and a control portion is provided on the mounting seat. By integrating inert gas protection, efficient cooling, and intelligent preheating functions, the present invention significantly improves welding quality and production safety, while realizing a high-precision and efficient automated welding process.

Description

Technical Field

[0001] The present 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.) has occupied 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 also 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 degree of automation.

[0003] A straight seam welding machine is a type of automated welding equipment that uses automation and mechanization to automatically create straight seams on workpieces. Also known as a straight seam automatic welder or a longitudinal seam automatic welder, this machine is a type of automatic welding machine. It can replace a significant amount of manual labor, significantly improving production efficiency and welding quality, reducing labor costs, and improving the working environment for welders. It is widely used in the metal product manufacturing industry, particularly for welding applications requiring long straight seams, such as cylinders and pipes. It efficiently and reliably completes these long straight seams and can accommodate welding requirements for a variety of specifications and materials.

[0004] However, existing straight seam welding equipment still faces several challenges in practical application. The first is how to effectively protect the weld area from oxidation and other possible impurities. This not only affects 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 weld 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 that significantly improves welding quality and production safety by integrating inert gas protection, efficient cooling and intelligent preheating functions, while realizing a high-precision and efficient automated welding process.

[0009] The technical solutions adopted by the present invention are as follows:

[0010] A metal welding device includes a straight seam welding machine body, a linear drive assembly is provided 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 provided at the left end of the straight seam welding machine body;

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

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

[0013] A preheating mechanism, the preheating mechanism comprising a gas supply portion provided on the side of the straight seam welding machine body, a blocking portion provided in an array on the top surface of the straight seam welding machine body, and a control portion provided on the mounting seat;

[0014] During welding, 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 the 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 using a support rod. The first annular air pipe and the second annular air pipe are connected to each other, and 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 the gear ring.

[0016] In a preferred embodiment, the driving part includes a hollow cylinder, which is fixedly connected to the welding head. 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. 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. 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. The hot air blower is connected to a hot air duct. Two gas storage grooves are opened at the left end of the straight seam welding machine body, and the gas storage grooves are connected to the hot air duct. The gas storage grooves are connected to the exhaust pipes in an array.

[0019] In a preferred embodiment, the blocking portion 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 passes through the outside of the air storage tank. The upper end of the guide rod is fixedly connected to a force plate, and a compression spring is connected to the force plate, 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 the mounting seat, the lower end of the bracket is fixedly connected to the mounting plate, the mounting plate is threadedly connected to a threaded rod, the lower end of the threaded rod is rotatably connected to a resistance member, the top surface of the resistance member is fixedly connected to a limiting rod, and the limiting rod and the mounting plate are slidably connected.

[0021] In a preferred embodiment, the resistance member includes a pressure 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 pressure plate, and a fastening bolt is provided on the pressure 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] This invention incorporates a rotating air jet to form a protective inert gas curtain during the welding process, effectively isolating the weld zone from the surrounding air and preventing oxygen, moisture, and other impurities from entering the molten pool. This design not only improves the appearance of the weld but, more importantly, enhances the strength and durability of the weld joint, reducing the incidence of welding defects such as porosity and cracks, thereby ensuring the safety and reliability of the welded structure.

[0025] The cooling unit design of this invention effectively cools the weld area. It uses rotating blades to draw in ambient air and exhaust it through an exhaust pipe, accelerating heat dissipation. In particular, the gradually decreasing inner diameter of the exhaust pipe, based on the Bernoulli equation, increases exhaust velocity, reduces gas temperature, and further enhances the cooling effect. This helps avoid weld deformation caused by improper cooling and ensures the overall stability and safety of the welded structure.

[0026] The preheating mechanism of this invention combines the gas supply and sealing components with the control unit to provide an intelligent preheating solution. The hot air generated by the hot air blower enables precise preheating of welds at various locations. Furthermore, the adjustable extension plate allows for customized preheating time adjustments to accommodate welding of varying materials and thicknesses. Proper preheating reduces welding stress and enhances weld pool fluidity, further improving welding efficiency and weld quality. This makes the device suitable for a wide range of high-precision welding applications on various metal parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0028] Figure 2 It is a partial structural 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 This invention Figure 1 sectional view of

[0032] Figure 6 This 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 diagram of the control unit of the present invention.

[0035] In the accompanying drawings, the components represented by the reference numerals are 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. Drive 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, exhaust 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. Pressure 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 embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. 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" 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" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it constitute a separate or selective embodiment that is mutually exclusive of other embodiments.

[0050] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0051] Please see the 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 provided 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 provided at the left end of the straight seam welding machine body 1;

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

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

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

[0055] During welding, inert gas is fed into the driving portion 52 to drive the jet portion 51 to rotate, and the inert gas is fed into the jet portion 51 along the driving portion 52. The rotation of the jet portion 51 causes the cooling portion 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 joint, and then the welding head 42 is started to laser weld the metal 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. Both are products currently available on the market. When selecting a model, it is necessary to try to choose one that meets the requirements of this application under the premise of being suitable for the specifications and usage scenarios. The specific model specifications are not limited here.

[0058] The function of the fixing assembly 7 is to fix the metal parts 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 parts to be welded to perform welding operations.

[0059] Next, please refer to Figure 2The jet portion 51 includes a first annular air pipe 511, which 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 using a support rod. The first annular air pipe 511 and the second annular air pipe 512 are connected to each other. 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 does not cause the rotation of the second annular air pipe 512, thereby ensuring smooth 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. The upper end of the hollow cylinder 521 is connected to an air inlet pipe 526.

[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 is 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 engages with the ring gear 514, prompting 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, isolating the welding area from the surrounding air, preventing oxygen, moisture and other impurities from invading the molten pool, and avoiding 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, 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 an air outlet pipe 535 is connected to the ventilation hood 531.

[0064] In this embodiment, the ring gear 514 engages 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, causing negative pressure to be generated in the ventilation hood 531, sucking in external air, and then the air is discharged through the exhaust pipe 535 to cool the weld, prevent deformation of the weld, and improve the welding quality.

[0065] Furthermore, the inner diameter of the outlet end of outlet pipe 535 exhibits a gradually decreasing trend. As the flow rate increases, according to the principles of thermodynamics, as the velocity of a gas increases during an adiabatic process, its temperature decreases. This phenomenon can be explained by Bernoulli's equation, which states that in an ideal fluid, the pressure decreases where the velocity increases. Therefore, as the inner diameter of outlet pipe 535 decreases, the flow rate increases, resulting in a decrease in the gas temperature and improved heat dissipation.

[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 distributed in an array and are connected to exhaust pipes 614.

[0067] In this embodiment, hot air from hot air blower 611 is fed into air storage tank 613 via hot air duct 612 and ultimately discharged from exhaust pipe 614, preheating the welded area, reducing welding stress and further improving welding efficiency and weld quality. This design not only enables continuous and stable welding operations but also adapts to welding requirements for a variety of materials and thicknesses, significantly 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 passes through 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 within the air storage groove 613 and tightly fits against the air inlet end of the exhaust pipe 614, thereby controlling the closed state of the exhaust pipe 614. When the force-bearing plate 623 is squeezed by an external force, the blocking block 621 is driven downward by the guide rod 622, compressing the compression spring 624. At this point, the hot air is discharged through the exhaust pipe 614. When the force-bearing plate 623 is no longer squeezed, the restoring force of the compression spring 624 causes the blocking block 621 to return to its original position, thereby sealing 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 limiting rod 635, and the limiting rod 635 and the mounting plate 632 are slidably connected.

[0071] In this embodiment, the height of the resistance member 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 resistance member 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, before welding, if the workpiece needs to be preheated, the hot air blower 611 can be started, and hot air can be delivered to the air 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. 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 air 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] During the movement of the welding mechanism 4, the resistance member 634 on the control part 63 will be driven to move. During the movement, the resistance member 634 will press the force-bearing plate 623 at different positions, thereby unblocking the exhaust pipe 614 port, allowing 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 extension 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 metal parts to be welded are clamped and fixed using the fixing assembly 7 on the main body 1 of the straight seam welding machine to ensure that they remain stable during the welding process.

[0080] The linear drive assembly 2 is started to enable the connecting plate 3 and the welding mechanism 4 installed thereon to 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 air injection portion 51 to form a protective air 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. The first gear 523 meshes with the ring gear 514, causing the air injection unit 51 to rotate. This rotation ensures that when the inert gas is ejected from the air injection pipe 513, it can form a uniformly distributed protective gas curtain around the welding head 42, isolating oxygen and other impurities and preventing oxidation of the molten pool.

[0084] As the jet portion 51 rotates, the gear ring 514 engages with the second gear 534 in the cooling portion 53, causing the second round rod 532 and the fan blades 533 to rotate synchronously, generating negative pressure to inhale external air and discharge it through the air outlet pipe 535, thereby effectively cooling 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 control unit 63 adjusts the position of the resistance member 634. When it moves downward to contact and press down on the load-bearing plate 623, the blocking block 621 moves downward accordingly, opening the exhaust pipe 614 port, allowing hot air to escape and preheating 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 adapt to the welding requirements of different materials and thicknesses.

[0091] The foregoing is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained herein shall, unless otherwise specified or limited, be implemented in accordance with conventional means in the art.

Claims

1. A metal welding device, characterized in that: The straight seam welding machine comprises a main body (1), a linear drive assembly (2) is provided at the upper end of the main body (1), a connecting plate (3) is installed on the linear drive assembly (2), and a fixing assembly (7) is provided at the left end of the main 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) 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 the welding head (42), and a driving portion (52) and a cooling portion (53) fixedly mounted on the welding head (42); A preheating mechanism (6), the preheating mechanism (6) comprising a gas supply portion (61) arranged on a 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, the inert gas is fed into the driving portion (52) to drive the driving portion (52) to rotate the jet portion (51), and the inert gas is fed into the jet portion (51) along the driving portion (52). The rotation of the jet portion (51) causes the cooling portion (53) to operate to cool the weld. The gas delivery section (61) includes 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 the exhaust pipes (614) in an array arrangement; The blocking portion (62) includes a blocking block (621), the blocking block (621) 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) passes through the outside of the air storage tank (613), the upper end of the guide rod (622) is fixedly connected to a force plate (623), the force 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); The control portion (63) includes 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 limiting rod (635), and the limiting rod (635) and the mounting plate (632) are slidably connected.

2. A metal welding device according to claim 1, characterized in that: The air injection portion (51) includes 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 a support rod, the first annular air pipe (511) and the second annular air pipe (512) are communicated with each other, the bottom surface of the first annular air pipe (511) is connected to the air injection pipe (513) in an annular distribution, and the top surface of the first annular air pipe (511) is fixedly connected to the gear ring (514).

3. The metal welding device according to claim 2, characterized in that: The driving portion (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), and 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. The metal welding device according to claim 3, characterized in that: The cooling portion (53) comprises a ventilation hood (531), the ventilation hood (531) being fixedly connected to the welding head (42), a second round rod (532) being rotatably connected to the ventilation hood (531), one end of the second round rod (532) being connected to a fan blade (533), the other end of the second round rod (532) being connected to a second gear (534), and an air outlet pipe (535) being connected to the ventilation hood (531).

5. The metal welding device according to claim 4, characterized in that: The resisting member (634) comprises a pressing plate (6341), the pressing plate (6341) being fixedly connected to the lower end of the limiting rod (635) and rotatably connected to the threaded rod (633), an extension plate (6342) being slidably connected to the pressing plate (6341), and a fastening bolt (6343) being provided on the pressing plate (6341).

6. The metal welding device according to claim 5, 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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