High-strength steel part low-temperature welding equipment and process

Abstract

The invention relates to low-temperature welding equipment and process for a high-strength steel part, and relates to the technical field of welding. The device comprises a preheating device and a welding device, the preheating device is provided with a preheating channel, a bottom supporting roller and a side supporting roller are arranged in the preheating device, and stable conveying and side supporting of steel parts are achieved through conveying drive and telescopic drive. And air storage cavities and air spraying holes are formed in the side supporting rods, rotary air outlet can be achieved, and the preheating effect is enhanced. In addition, a heating cavity is formed in the bottom supporting roller and matched with a bottom heat adjusting assembly, and uniform preheating is ensured. According to the process, by optimizing the preheating and welding steps, the welding quality and efficiency are improved, the welding defects are reduced, and the process is suitable for low-temperature welding of high-strength steel parts.

Description

Technical Field

[0001] The present application relates to the technical field of steel processing equipment, and in particular to a high-strength steel low-temperature welding device and process. Background Art

[0002] Preheating is required before low-temperature welding of steel parts. It is one of the effective measures to avoid the formation of hardened structure, reduce welding stress and prevent welding cracks. The preheating temperature must be appropriate. If the preheating temperature is not high enough, the metal near the seam will still produce hardened structure and even cold cracks. On the contrary, if the preheating temperature is too high, the plasticity and toughness of the steel will drop sharply due to the coarse grains of the weld. The preheating temperature should be determined according to the plate thickness. When δ≥16mm, the preheating temperature is about 100-200℃.

[0003] The steel preheating equipment in the related technology usually includes a preheating channel, and a bottom support rod for conveying the steel parts is arranged inside the preheating channel. The bottom support rod supports and conveys the steel parts through a motor and other components. In addition, the preheating channel is also provided with a blower for continuously conveying heated air to the inside of the preheating channel, so as to perform heat exchange on the air inside the preheating channel to achieve temperature increase, thereby achieving preheating of the steel parts.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: after hot air is continuously blown at a fixed angle inside the preheating channel, it is often only possible to quickly heat up specific parts of the steel parts. The air inside the entire preheating channel is prone to dead corners during circulation, especially for steel parts with higher baffles such as I-beams, so there is room for improvement. Summary of the invention

[0005] In order to reduce circulation dead angles, the present application provides a high-strength steel low-temperature welding device and process.

[0006] In the first aspect, the present application provides a high-strength steel low-temperature welding device that adopts the following technical solution:

[0007] A high-strength steel low-temperature welding device comprises a preheating device and a welding device, wherein the welding device is located at the rear section of the preheating device, the preheating device comprises a preheating channel, a bottom support rod for bottom support of the steel piece is arranged inside the preheating channel, the bottom support rod is rotatably connected to the inside of the preheating channel, the preheating channel is connected to a conveying drive for driving the bottom support rod to rotate, a side support rod for side support of the steel piece is arranged inside the preheating channel, the preheating channel is slidably connected to a side bracket, the side support rod is rotatably connected to the side bracket, the preheating channel is connected to a telescopic drive for adjusting the sliding position of the side bracket, an air supply channel is arranged inside the side bracket, an air storage chamber is arranged inside the side support rod, the air supply channel is connected to the air storage chamber, a plurality of air spray holes are arranged at the bottom of the side support rod, and the plurality of air spray holes are all connected to the air storage chamber.

[0008] By adopting the above technical solution, uniform preheating of steel parts is achieved. Specifically, the side support rods can not only support the steel parts laterally, but also continuously deliver hot air to the preheating channel through the air jet holes, and the air jet holes can rotate and discharge air as the side support rods passively rotate, thereby significantly increasing the turbulence inside the preheating channel, effectively reducing the dead angle of circulation, and improving the preheating efficiency and uniformity. This helps to avoid hardened structures or cold cracks caused by insufficient local preheating, and can also prevent the problem of coarse grains in the weld caused by excessive preheating temperature.

[0009] Preferably, the side support stick is penetrated by a clearance hole, the clearance hole is communicated with the air storage chamber, the side bracket has a portion passing through the clearance hole and threadedly provided with a limiting ring, the limiting ring is located below the side support stick to provide bottom support for the side support stick.

[0010] By adopting the above technical solution, the limiting ring can effectively fix the position of the side support rod, ensure its stability during the preheating process, and prevent the side support rod from shifting due to vibration or impact, thereby ensuring the consistency and reliability of the preheating effect. At the same time, the design of the clearance hole allows the side bracket to flexibly adjust its position to adapt to steel parts of different sizes and shapes, thereby improving the scope of application and flexibility of the equipment.

[0011] Preferably, a plurality of mounting holes are provided on the top of the limiting ring, balls are provided in the mounting holes, a receiving ring groove is provided on the bottom wall of the side support rod, and the tops of the plurality of balls extend out of the mounting holes and are inserted into the receiving ring groove.

[0012] By adopting the above technical solution, the cooperation between the ball and the receiving ring groove enables the side support rod to rotate smoothly, reduces friction resistance, and improves the rotation flexibility of the side support rod, thereby further enhancing the uniform distribution of hot air during the preheating process, reducing the flow dead corners in the preheating channel, and improving the preheating effect.

[0013] Preferably, an adjustment plate is provided inside the air storage chamber, the adjustment plate covers the plurality of air holes, the adjustment plate has an adjustment groove, the adjustment groove is connected to the plurality of air holes, and the width of the adjustment groove is arranged to increase along the length direction of the adjustment groove.

[0014] By adopting the above technical solution, the regulating plate can effectively control the airflow distribution in the air storage cavity, so that the airflow is discharged more evenly from the air injection hole, thereby improving the preheating efficiency and preheating uniformity. The width design of the regulating slot enables the airflow to obtain different pressures at different positions, further optimizing the flow characteristics of the airflow, reducing the flow dead angle during the preheating process, and improving the preheating effect.

[0015] Preferably, the adjustment plate is connected with a connecting rod, a connecting hole is provided at the top of the limiting ring, the connecting rod passes through the making way hole and the bottom is inserted into the connecting hole.

[0016] By adopting the above technical solution, the connection between the adjustment plate and the connecting rod and the cooperation between the connecting rod and the limit ring, the position of the adjustment plate can change with the movement of the side support stick, so that the opening of the air jet hole and the air volume distribution can be dynamically adjusted, thereby further improving the preheating efficiency and uniformity, reducing the circulation dead corners in the preheating channel, ensuring that all parts of the steel parts are heated more evenly, and improving the welding quality.

[0017] Preferably, a heating chamber is provided inside the bottom support rod, and a heating element is provided inside the heating chamber.

[0018] By adopting the above technical solution, the bottom support rod can heat the steel parts simultaneously during the preheating process, thereby improving the preheating efficiency and uniformity, reducing the preheating time, and thus improving the working efficiency of the entire welding equipment.

[0019] Preferably, the preheating channel is connected to a bottom heat adjustment component for adjusting the relative position of the heating element with respect to the bottom support rod, the bottom heat adjustment component includes a cover and a locking rod, the heating element is connected to the adjustment rod, the cover is connected to the preheating channel, the adjustment rod passes through the cover and can slide relatively, the cover is provided with a locking hole, the locking rod is threadedly connected to the locking hole and the bottom of the locking rod is against the adjustment rod.

[0020] By adopting the above technical solution, the position of the heating element relative to the bottom support rod can be flexibly adjusted to ensure that the heating element can be adjusted to the best working position according to actual needs, thereby improving the preheating efficiency and uniformity. At the same time, through the cooperation of the locking rod and the locking hole, the adjustment rod can be firmly fixed to ensure the stability and safety of the heating element during the preheating process.

[0021] Preferably, the outer wall of the bottom support rod is provided with a plurality of weight-reducing grooves, and the plurality of weight-reducing grooves are connected to the heating chamber.

[0022] By adopting the above technical solution, a number of weight-reducing grooves arranged on the outer wall of the bottom support rod can effectively reduce the overall weight of the bottom support rod and reduce energy consumption during the transportation process. At the same time, the weight-reducing grooves are connected to the heating chamber, which helps to better transfer heat to the surface of the steel parts and improve the preheating efficiency and uniformity.

[0023] Preferably, the opening directions of the plurality of weight-reducing grooves are staggered.

[0024] By adopting the above technical solution, the staggered opening directions of the plurality of weight-reducing grooves can effectively improve the structural strength of the bottom support rod, while reducing weight, reducing material usage, and reducing production costs. In addition, the staggered weight-reducing grooves can also increase airflow disturbance in the preheating channel, further reduce dead corners, and improve preheating uniformity and efficiency.

[0025] In the second aspect, the present application provides a high-strength steel low-temperature welding process, which adopts the following technical solution:

[0026] A low-temperature welding process for high-strength steel parts, during the process of conveying the steel parts in a preheating device, the bottom of the steel parts abuts against a bottom support rod, and the side parts abut between the two side support rods, and the side support rods are driven to passively rotate during the side conveying process, and the air jet holes of the side support rods continuously convey hot air into the preheating channel during the preheating process, and a plurality of air jet holes realize rotating air discharge as the side support rods passively rotate, so as to increase the turbulence inside the preheating channel and reduce the flow dead angle; the steel parts after preheating are conveyed to the welding device for welding to finally complete the processing.

[0027] By adopting the above technical solution, all parts of the steel parts can be heated evenly, thereby improving the preheating effect and welding quality; the preheated steel parts are transported to the welding device for welding to finally complete the processing.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. By arranging side support rods and air supply channels inside the preheating channel, hot air can be evenly delivered to the surface of the steel parts from multiple directions, reducing the dead corners of the preheating channel and improving the uniformity and efficiency of preheating;

[0030] 2. The air holes of the side support rods rotate with the passive rotation of the side support rods to achieve rotating air discharge, which increases the turbulence inside the preheating channel and further improves the uniformity and speed of preheating;

[0031] 3. By adjusting the sliding position of the side bracket, the position of the side support stick can be flexibly adjusted according to steel parts of different sizes and shapes to ensure the consistency and stability of the preheating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of an embodiment of the present application;

[0033] Figure 2 for Figure 1 Cross-sectional view along AA direction;

[0034] Figure 3 This is a structural schematic diagram for illustrating the connection relationship between the side bracket and the side support rod in the embodiment of the present application;

[0035] Figure 4 This is a disassembly diagram used to illustrate the positional relationship between the adjustment plate and the air injection hole in the embodiment of the present application.

[0036] In the figure: 1. preheating device; 11. preheating channel; 12. conveying drive; 13. telescopic drive;

[0037] 2. Welding device;

[0038] 3. Bottom support rod; 30. Heating chamber; 31. Heating element; 32. Adjustment rod; 33. Weight reduction groove;

[0039] 4. Side bracket; 40. Air supply channel;

[0040] 5. Side support rod; 50. Air storage chamber; 51. Give way hole; 52. Air ejection hole;

[0041] 6. Limiting ring; 60. Mounting hole; 61. Ball bearing; 62. Receiving ring groove;

[0042] 7. Adjustment plate; 70. Adjustment slot; 71. Connecting rod; 72. Connecting hole;

[0043] 8. bottom heat regulating assembly; 81. cover; 82. locking rod; 83. locking hole. DETAILED DESCRIPTION

[0044] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can completely combine the embodiments of the present invention to obtain other embodiments without creative work, and these embodiments are also within the scope of protection of the present invention.

[0045] The inventor of this application has found that preheating is required before low-temperature welding of steel parts, which is one of the effective measures to avoid the formation of hardened structures, reduce welding stress, and prevent welding cracks. To this end, this application mainly adopts the following high-strength steel low-temperature welding equipment and process, which achieves the effect of reducing the flow dead angle inside the preheating channel and improving the preheating uniformity. The following is a further detailed description of this application.

[0046] Example

[0047] Reference Figure 1 The embodiment of the present application provides a high-strength steel low-temperature welding device, including a preheating device 1 and a welding device 2, wherein the welding device 2 is located at the rear section of the preheating device 1. The preheating device 1 includes a preheating channel 11 which is square on the outside and hollow on the inside, and the preheating channel 11 is used to transport and preheat the steel. After the steel is preheated, it is transported to the welding device 2 for low-temperature welding of the steel.

[0048] Reference Figure 2 A plurality of bottom support rods 3 are rotatably arranged inside the preheating channel 11. During the conveying process of the steel parts, they abut against the top of the plurality of bottom support rods 3. A conveying drive 12 is also installed on the outside of the preheating channel 11. In this embodiment, the conveying drive 12 is a motor used to drive the bottom support rods 3 to rotate.

[0049] Reference Figure 2 The side wall of the preheating channel 11 is also provided with a side bracket 4. The part of the side bracket 4 located inside the preheating channel 11 is rotatably provided with a side support rod 5. The outer wall of the preheating channel 11 is provided with a telescopic drive 13. In this embodiment, the telescopic drive 13 adopts a cylinder and the driving end is connected to the side bracket 4 to adjust the extent to which the side bracket 4 extends into the preheating channel 11. By adjusting the position of the side bracket 4, the position of the side support rods 5 located on both sides of the steel part can be finally adjusted. The steel part in this embodiment takes an I-beam as an example. The side support rods 5 on both sides are respectively pressed against the left and right sides of the vertical plate of the steel part, thereby assisting in the stable transportation of the steel part. In addition, the part of the side bracket 4 located outside the preheating channel 11 is also connected to the hot air source. The side bracket 4 itself has an air supply channel 40 inside, so that the hot air at the hot air source is continuously sent into the preheating channel 11 through the air supply channel 40 to achieve the preheating of the steel part.

[0050] Reference Figure 3The side support stick 5 is provided with an air storage chamber 50 inside, and a clearance hole 51 is provided through the side support stick 5 in the axial direction, and the clearance hole 51 is connected with the air storage chamber 50. The side bracket 4 has a section that passes through the clearance hole 51 and the air storage chamber 50 and extends out of the side support stick 5. The end portion is sleeved with a limiting ring 6, and the limiting ring 6 is threadedly connected to the side bracket 4 to support the bottom of the side support stick 5 through the limiting ring 6. The air supply channel 40 located inside the air storage chamber 50 between the sides is connected with the air storage chamber 50, so that the side support stick 5 can rotate and slide up and down relative to the side bracket 4 to achieve stable hot air transportation, and has both flexibility and stability.

[0051] Reference Figure 3 In order to further improve the smoothness of rotation between the side support rod 5 and the limiting ring 6, the limiting ring 6 is provided with a plurality of mounting holes 60 on the top, and the plurality of mounting holes 60 are evenly distributed along the circumference of the limiting ring 6. A ball 61 is provided in each mounting hole 60, and the top of the ball 61 extends out of the mounting hole 60 and each ball 61 can rotate freely in the corresponding mounting hole 60. The bottom wall of the side support rod 5 is provided with a receiving ring groove 62, which is coaxially arranged with the side support rod 5, and the receiving ring groove 62 corresponds to the distribution position of the plurality of balls 61 in the vertical projection. The tops of the plurality of balls 61 extend out of the mounting hole 60 and are inserted into the receiving ring groove 62, so that the plurality of balls 61 are driven to rotate during the rotation of the side support rod 5, so as to convert the sliding friction between the side support rod 5 and the limiting ring 6 into the rolling friction between the ball 61, thereby reducing the friction resistance and improving the rotation stability of the side support rod 5.

[0052] Reference Figure 3 and Figure 4 , a plurality of air jet holes 52 are provided through the bottom of the side support rod 5, and the tops of the plurality of air jet holes 52 are connected to the air storage chamber 50, so as to further transfer and transport the hot air inside the air storage chamber 50 to the inside of the preheating channel 11. In addition, an adjustment plate 7 is also laid at the bottom of the air storage chamber 50, and the external dimensions of the adjustment plate 7 itself can completely cover the plurality of air jet holes 52, but the adjustment plate 7 is located at the plurality of air jet holes 52 and is provided with an adjustment groove 70 with a nearly annular distribution, and the adjustment groove 70 is connected to the plurality of air jet holes 52, and the width of the adjustment groove 70 is also variable, and the width of each adjustment groove 70 increases along the length direction of the adjustment groove 70, that is, the cross-sectional area of ​​the actual connecting part of each air jet hole 52 and the adjustment groove 70 in the plurality of air jet holes 52 is different, and there is a progressive relationship. By using this method, the actual air jet volume of the plurality of air jet holes 52 can be further differentiated, and the degree of turbulence can be further improved by using this differentiation, thereby further reducing the dead angle of circulation.

[0053] The adjusting plate 7 itself is in the shape of an annular plate and is provided with a plurality of connecting rods 71 ​​extending downward from the position near the clearance hole 51. The plurality of connecting rods 71 ​​are evenly distributed around the axis of the adjusting plate 7 and extend out of the clearance hole 51 from the gap between the clearance hole 51 and the side bracket 4. The top of the limiting ring 6 is evenly distributed with a plurality of connecting holes 72, and the bottoms of the plurality of connecting rods 71 ​​are inserted into the corresponding connecting holes 72 to achieve the following movement of the adjusting plate 7 and the limiting ring 6. For example, the wider part of the adjusting slot 70 can be rotated to the side close to the steel part to be welded, so that more hot air in the air storage chamber 50 is blown to the part to be welded first, and the active regulation of the hot air resource allocation is achieved. In other embodiments, it is also possible to choose whether to adjust the adjustment plate 7 to move with the limit ring 6 according to the situation. If the adjustment plate 7 does not move with the limit ring 6, it is only necessary to place the adjustment plate 7 in the opposite direction so that the connecting rod 71 is not inserted into the corresponding connecting hole 72. In this state, the adjustment plate 7 moves with the side support rod 5, thereby realizing the dynamic change of air outlets at various places while rotating the air outlet. This state can further improve the turbulence inside the entire preheating channel 11. Compared with the former, the temperature uniformity inside the entire preheating channel 11 will be better in terms of the priority of hot air resources at the welded part. However, when the hot air resources themselves are insufficient, it is possible to choose to give priority to the hot air resources supply to the welded part.

[0054] Reference Figure 2 The bottom support rod 3 is hollow inside to form a heating chamber 30, and a heating element 31 is arranged inside the heating chamber 30. In this embodiment, the heating element 31 adopts a ceramic heating plate. Compared with the traditional resistance wire heating element 31, the ceramic heating plate has higher thermal efficiency and better high temperature resistance. In this way, it can ensure that the bottom support rod 3 maintains a stable heating effect during long-term use and prolongs its service life. The heating element 31 is connected to an adjustment rod 32, and the adjustment rod 32 passes through the preheating channel 11 and can slide relative to the preheating channel 11.

[0055] Reference Figure 2The outside of the preheating channel 11 is connected with a bottom heat adjustment component 8 for adjusting the relative position of the heating element 31 relative to the bottom support rod 3. The bottom heat adjustment component 8 includes a cover 81 and a locking rod 82. The cover 81 is connected to the outer wall of the preheating channel 11 and the adjustment rod 32 also passes through the cover 81 and the adjustment rod 32 is in a relatively slidable state relative to the cover 81. A locking hole 83 is provided on the top of the cover 81. The locking rod 82 is threadedly connected to the locking hole 83 and the bottom of the locking rod 82 is against the adjustment rod 32. The locking rod 82 is used to tighten the adjustment rod 32 to achieve locking of the position of the heating element 31. Correspondingly, the sliding adjustment of the heating element 31 can be achieved by loosening the locking rod 82. When the actual welding position of the steel piece changes, the above structure can be used to adjust the position of the heating element 31 so that the heating element 31 is located directly below the position to be welded, so as to better heat the bottom of the steel piece and achieve circumferential heating uniformity at the position to be welded. The outer wall of the bottom support rod 3 is also provided with a plurality of weight-reducing grooves 33, and the plurality of weight-reducing grooves 33 are all connected to the heating chamber 30, and the opening directions of the weight-reducing grooves 33 are staggered, that is, the opening directions of adjacent weight-reducing grooves 33 are opposite. Through this design, the supporting strength of the entire bottom support rod 3 can be uniform, and it is not easy to be locally deformed when bearing weight. Moreover, during the rotation of the bottom support rod 3, the plurality of weight-reducing grooves 33 can also serve as windows for heat exchange between the heating chamber 30 and the preheating channel 11, and a certain degree of turbulence can be generated during its rotation to promote the uniformity of heating at various locations in the preheating channel 11.

[0056] The implementation principle of this embodiment is as follows:

[0057] Design of the side support rod 5: By providing the side support rod 5, the side of the steel piece can be supported during the conveying process to prevent the steel piece from shifting. The air storage chamber 50 and the air injection hole 52 provided inside the side support rod 5 can blow hot air to the side of the steel piece to achieve more uniform preheating. The air injection hole 52 realizes rotating air discharge as the side support rod 5 passively rotates, further increasing the turbulence inside the preheating channel 11 and reducing the circulation dead angle.

[0058] The design of the limiting ring 6 and the ball 61: The design of the limiting ring 6 and the ball 61 enables the side support rod 5 to rotate smoothly under the support of the side bracket 4, avoiding damage caused by excessive friction. The ball 61 is embedded in the receiving ring groove 62, ensuring the stability and wear resistance of the side support rod 5.

[0059] Design of the adjustment plate 7: The setting of the adjustment plate 7 can adjust the opening and closing degree of the air jet hole 52 as needed. By setting the width of the adjustment slot 70 in increments, the air jet intensity at different positions can be finely controlled, thereby achieving the best preheating effect.

[0060] Design of the bottom support rod 3: The heating chamber 30 and heating element 31 arranged inside the bottom support rod 3 can directly heat the bottom of the steel part, thus improving the preheating efficiency. The setting of the bottom heat adjustment assembly 8 can adjust the position of the heating element 31 as needed to achieve adaptive preheating of steel parts of different thicknesses. The setting of the weight reduction groove 33 reduces the weight of the bottom support rod 3, reduces energy consumption, and also increases the heat exchange area, improves the uniformity of preheating, and can also increase turbulence to a certain extent.

[0061] In summary, this embodiment achieves efficient and uniform preheating of steel parts through multi-faceted design optimization, reduces flow dead corners inside the preheating channel 11, improves welding quality, reduces production costs, and improves production efficiency.

Claims

1. A high-strength steel low-temperature welding device, comprising a preheating device (1) and a welding device (2), wherein the welding device (2) is located at the rear section of the preheating device (1), and the preheating device (1) comprises a preheating channel (11), wherein a bottom support rod (3) for bottom supporting the steel part is arranged inside the preheating channel (11), wherein the bottom support rod (3) is rotatably connected to the inside of the preheating channel (11), and wherein the preheating channel (11) is connected to a conveying drive (12) for driving the bottom support rod (3) to rotate, wherein: The preheating channel (11) is provided with a side support stick (5) for supporting the steel part on the side. The preheating channel (11) is slidably connected to a side bracket (4). The side support stick (5) is rotatably connected to the side bracket (4). The preheating channel (11) is connected to a telescopic drive (13) for adjusting the sliding position of the side bracket (4). The side bracket (4) is provided with an air supply channel (40). The side support stick (5) is provided with an air storage chamber (50). The air supply channel (40) is connected to the air storage chamber (50). The bottom of the side support stick (5) is provided with a plurality of air injection holes (52). The plurality of air injection holes (52) are all connected to the air storage chamber (50).

2. The high-strength steel low-temperature welding equipment according to claim 1, characterized in that: The side support rod (5) is provided with a clearance hole (51) extending therethrough, the clearance hole (51) being in communication with the air storage chamber (50), the side bracket (4) having a portion passing through the clearance hole (51) and being threadedly sleeved with a limiting ring (6), the limiting ring (6) being located below the side support rod (5) for providing bottom support for the side support rod (5).

3. The high-strength steel low-temperature welding equipment according to claim 2, characterized in that: The top of the limiting ring (6) is provided with a plurality of mounting holes (60), and a ball bearing (61) is arranged in the mounting hole (60). The bottom wall of the side support rod (5) is provided with a receiving ring groove (62), and the tops of the plurality of ball bearings (61) extend out of the mounting hole (60) and are inserted into the receiving ring groove (62).

4. The high-strength steel low-temperature welding equipment according to claim 2, characterized in that: An adjusting plate (7) is arranged inside the air storage chamber (50), the adjusting plate (7) covers (81) a plurality of the air ejection holes (52), the adjusting plate (7) has an adjusting groove (70), the adjusting groove (70) is connected to the plurality of the air ejection holes (52), and the width of the adjusting groove (70) is arranged to increase gradually along the length direction of the adjusting groove (70).

5. The high-strength steel low-temperature welding equipment according to claim 4, characterized in that: The adjustment plate (7) is connected to a connecting rod (71), the top of the limiting ring (6) is provided with a connecting hole (72), the connecting rod (71) passes through the clearance hole (51) and the bottom is inserted into the connecting hole (72).

6. The high-strength steel low-temperature welding equipment according to claim 1, characterized in that: A heating chamber (30) is arranged inside the bottom support rod (3), and a heating element (31) is arranged inside the heating chamber (30).

7. The high-strength steel low-temperature welding equipment according to claim 6, characterized in that: The preheating channel (11) is connected to a bottom heat adjustment component (8) for adjusting the relative position of the heating element (31) relative to the bottom support rod (3). The bottom heat adjustment component (8) comprises a cover (81) and a locking rod (82). The heating element (31) is connected to the adjustment rod (32). The cover (81) is connected to the preheating channel (11). The adjustment rod (32) passes through the cover (81) and can slide relatively. The cover (81) is provided with a locking hole (83). The locking rod (82) is threadedly connected to the locking hole (83) and the bottom of the locking rod (82) abuts against the adjustment rod (32).

8. The high-strength steel low-temperature welding equipment according to claim 6, characterized in that: The outer side wall of the bottom support rod (3) is provided with a plurality of weight-reducing grooves (33), and the plurality of weight-reducing grooves (33) are in communication with the heating chamber (30).

9. The high-strength steel low-temperature welding equipment according to claim 8, characterized in that: The opening directions of the plurality of weight-reducing grooves (33) are arranged in a staggered manner.

10. A low temperature welding process for high strength steel parts, characterized in that: During the conveying process of the steel piece in the preheating device (1), the bottom part abuts against the bottom support rod (3), and the side part abuts between the two side support rods (5), and the side part conveying process drives the side support rods (5) to passively rotate. During the preheating process, the air jet holes (52) of the side support rods (5) continuously convey hot air into the preheating channel (11), and a plurality of air jet holes (52) realize rotating air discharge as the side support rods (5) passively rotate, so as to increase the turbulence inside the preheating channel (11) and reduce the circulation dead angle. After the preheating, the steel piece is conveyed to the welding device (2) for welding, so as to finally complete the processing.

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