Transition welding device and welding process for CCB skeleton

Abstract

The application relates to the technical field of CCB skeleton welding, and particularly discloses a transition welding device for a CCB skeleton and a welding process, which comprises a CCB skeleton and a clamp, the CCB skeleton is placed on the clamp, the lower end of the clamp is provided with a placing table, the placing table is symmetrically provided with two groups, one side of the placing table is provided with an alternate cycle welding mechanism, the other side of the placing table is provided with a deep cooling assembly, and the upper side of the placing table is provided with a clamping and moving assembly; the CCB skeleton is placed on the clamp, the CCB skeleton is welded through the alternate cycle welding mechanism, the CCB skeleton on the other group of placing tables is clamped at the same time, the CCB skeleton is subjected to deep cooling treatment through the deep cooling assembly after partial position welding, meanwhile, the other group of CCB skeletons is welded, and the alternate cycle welding and the deep cooling treatment are sequentially carried out, and finally, the CCB skeletons are sorted through the clamping and moving assembly, so that synchronous alternate operation of welding and deep cooling treatment is realized, welding heat input is effectively controlled, the performance of a weld joint is improved, and welding deformation is reduced.

Description

Technical Field

[0001] This application relates to the field of CCB skeleton welding technology, and in particular to a transition welding device and welding process for CCB skeletons. Background Technology

[0002] The CCB frame, or dashboard crossbeam, is a critical structural component installed in the lower front of the passenger compartment. It typically consists of a main beam and multiple functional supports welded to it. Its main functions are to provide a mounting base and strength support for the dashboard assembly, fix the steering column to ensure the rigidity of the steering system, and provide precise positioning and mounting points for wiring harnesses, various control units, and electrical components. In addition, as an important lateral support connecting the left and right sides of the vehicle body and the front wall of the engine compartment, the CCB frame plays a crucial role in improving the overall vehicle rigidity and collision safety performance. The manufacturing process of the CCB frame involves many thin-walled components and connections of different materials. If the welding process is not proper, it is easy to cause stress concentration, welding deformation, and other problems, which will affect the overall dimensional accuracy and structural strength of the frame.

[0003] In existing technologies, CCB frame welding devices typically include a worktable that serves as a support base. The worktable is equipped with multiple support seats and positioning pins for placing and positioning the main beam. These positioning pins cooperate with preset holes on the main beam to achieve precise positioning in the horizontal and vertical directions. Around the welding area of ​​the worktable, multiple sets of clamping mechanisms are symmetrically arranged to clamp and fix the functional supports. Each clamping mechanism typically consists of a clamp support seat fixedly installed on the worktable and a robotic gripper movably connected to it. The robotic gripper can be adjusted according to the shape of the support and apply clamping force. In actual welding operations, automated welding robots are usually used for welding. The robot will move to the position of each weld according to the preset welding path and complete the welding operation while the clamps reliably fix the main beam to each support.

[0004] Regarding the aforementioned technologies, the heat input of automated welding robots during the welding process is relatively concentrated, resulting in localized high temperatures in the weld area while the surrounding base material temperature is relatively low. This uneven temperature field may cause uneven thermal expansion and contraction of the material, leading to significant residual welding stress within the structure. This can cause the CCB frame to flex, twist, or partially dent. Such welding deformation not only directly affects the geometry of the frame, making subsequent assembly with components such as the instrument panel and steering column difficult, but also reduces the dynamic stiffness and fatigue resistance of the structure. Under long-term vehicle vibration conditions, microcracks are prone to form and propagate in the weld area, posing a safety hazard. Therefore, improvements are needed. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a transition welding device and welding process for CCB skeletons.

[0006] This application provides a transition welding device and welding process for a CCB skeleton, which adopts the following technical solution: A transition welding device for CCB skeletons includes a CCB skeleton and a fixture. The CCB skeleton is placed on the fixture. A placement platform is rotatably provided at the lower end of the fixture. Two sets of placement platforms are symmetrically arranged. Welding platforms are rotatably provided at the lower ends of the two sets of placement platforms. An alternating cycle welding mechanism is provided on one side of the welding platform for alternating cycle welding of the two sets of CCB skeletons on the two sets of placement platforms. A cryogenic component is provided on the side of the welding platform away from the alternating cycle welding mechanism for cryogenic treatment of the CCB skeletons after alternating cycle welding. A welding frame is provided on the outer side of the welding platform. A clamping and moving component for sorting the welded CCB skeletons is provided on the frame of the welding frame.

[0007] By adopting the above technical solution, the CCB skeleton is placed on the placement table and firmly clamped by a fixture. Then, the CCB skeleton is alternately welded by the alternating cycle welding mechanism on one side of the welding platform in this application. While welding, the CCB skeleton on another set of placement tables is clamped. After partial welding of the CCB skeleton, the welded parts are cryogenically treated by the cryogenic component. While cryogenic treatment is performed, the other set of CCB skeletons is welded. After cryogenic treatment is completed, the alternating cycle welding is performed again. After all the CCB skeletons on both sets of placement tables are welded, the clamping and moving components on the welding frame sort the welded CCB skeletons. This achieves synchronous alternating operation of welding and cryogenic treatment, effectively controls the welding heat input and cooling rate, improves the weld microstructure and properties, reduces welding deformation, and improves welding efficiency by utilizing the alternating cycle of the two sets of placement tables, reducing manual intervention.

[0008] Optionally, the alternating cyclic welding mechanism includes a cold metal transfer welder, a first rotary cylinder, a rotating component, and a detection component. Two sets of cold metal transfer welders are symmetrically arranged, and both sets of cold metal transfer welders are located on one side of the welding platform. The first rotary cylinder is located at the lower end of the welding platform, and its output end is fixedly connected to the lower end of the welding platform. The rotating component is located on the welding platform and is used to rotate the placement platform. The detection component is located on the inner wall of the welding frame and is used to detect the CCB skeleton after alternating cyclic welding.

[0009] By adopting the above technical solution, a set of CCB skeletons is first placed on the fixtures of a set of placement platforms. Then, the first rotary cylinder is started. The output end of the first rotary cylinder rotates, driving the welding platform and the two sets of placement platforms to rotate. At this time, the two sets of cold metal transfer welding machines perform symmetrical welding and skip welding on the clamped CCB skeletons. At the same time, the second set of CCB skeletons is placed on the fixtures of another set of placement platforms. After the first set of CCB skeletons is partially welded, the first rotary cylinder is started again. The output end of the first rotary cylinder rotates, driving the two sets of placement platforms and the two sets of CCB skeletons to switch positions. Then, the second set of CCB skeletons is symmetrically welded and skip welded. At the same time, the first set of CCB skeletons is cooled. During welding, the end plates at both ends of the CCB skeleton are welded first, followed by the welding of the steering column, and finally the welding of the instrument panel. When welding the steering column and the instrument panel, welding should be performed from the middle to both ends. The two sets of CCB skeletons are alternately welded and cooled in turn until both sets of CCB skeletons are completely welded. This enables alternating cyclic welding at dual workstations, improving welding efficiency. Simultaneous welding from both sides by two sets of cold metal transition welding machines balances welding stress and reduces deformation. Skip welding disperses heat input, reducing heat concentration. Furthermore, welding the end plates on both sides of the CCB frame first creates a rigid, closed structure, enhancing the overall stiffness and resistance to subsequent welding thermal deformation. Then, when the overall stiffness reaches its optimal state, the steering column, requiring the highest precision, is welded to ensure assembly accuracy and positional stability. The steering column and instrument panel are welded symmetrically from the center to both ends, allowing heat to diffuse evenly from the center to both sides. The rigidity of the formed overall frame constrains weld shrinkage stress, further controlling cumulative deformation, thus achieving high-precision, low-stress welding of the entire CCB frame process. Optionally, the rotating component includes a second rotating cylinder, and two sets of the second rotating cylinder are symmetrically arranged. Both sets of the second rotating cylinder are vertically arranged at the upper end of the welding platform, and the output ends of the two sets of the second rotating cylinder are respectively fixedly connected to the two ends of the placement table.

[0010] By adopting the above technical solution, when welding the CCB skeleton, if the area to be welded cannot be flat-welded by the two sets of cold metal transfer welding machines, the two sets of second rotary cylinders are started simultaneously. The output ends of the two sets of second rotary cylinders rotate, driving the placement table to rotate. The rotation of the placement table drives the CCB skeleton to rotate, thereby achieving precise adjustment of the CCB skeleton welding angle. This allows the weld, which was originally in the overhead welding position, to rotate to the flat welding position for welding. In the flat welding position, the molten pool metal spreads naturally under the action of gravity and is not easy to flow, which is conducive to the floating of slag and the escape of gas. This reduces defects such as weld beads, undercut, and lack of fusion that are common in overhead welding, improves the internal quality and appearance of the weld, enhances welding reliability and the durability of the overall product structure, and can also meet the welding requirements of complex welds, improving welding flexibility.

[0011] Optionally, the detection assembly includes a mounting frame, a first lead screw motor, a mounting block, and a laser profilometer. The mounting frame is disposed on the inner side wall of the welding frame and is located above the placement stage at the end away from the cold metal transition welding machine. The first lead screw motor is disposed on the side wall of the mounting frame. The mounting block is slidably disposed at the lower end of the mounting frame and is threadedly connected to the lead screw of the first lead screw motor. The laser profilometer is disposed at the lower end of the mounting block.

[0012] By adopting the above technical solution, after welding certain parts of the CCB skeleton, the first lead screw motor is started. The output end of the first lead screw motor rotates, causing the mounting block to slide along the mounting frame. The sliding of the mounting block causes the laser profilometer to slide, thereby realizing automatic scanning and detection of the CCB skeleton, accurately acquiring the CCB skeleton contour data, and evaluating the welding quality. During the inspection after welding certain parts of the CCB skeleton, if deformation is found to exceed the allowable range, the welding operation can be stopped in time to prevent stress from accumulating and causing overall structural failure, reducing the difficulty and cost of subsequent correction and repair. This full-process scanning and detection mechanism not only realizes online prevention and process control of welding quality, but also provides data support for the dynamic optimization of welding process parameters, improving the welding accuracy, yield, and structural stability of the CCB skeleton. In addition, scanning the clamped CCB skeleton before welding can accurately verify the fit and relative position of the parts and the fixture, ensuring that key indicators such as weld assembly gap and misalignment meet the process requirements, and reducing welding defects caused by improper clamping.

[0013] Optionally, the cryogenic assembly includes a six-axis robot and a cryogenic liquid nitrogen nozzle. Two sets of the six-axis robots are symmetrically arranged, and both sets of the six-axis robots are located on the side of the welding platform away from the cold metal transition welding machine. Two sets of cryogenic liquid nitrogen nozzles are symmetrically arranged, and the two sets of cryogenic liquid nitrogen nozzles are respectively located on the output ends of the two sets of six-axis robots.

[0014] By adopting the above technical solution, after welding the CCB skeleton at certain locations, two sets of six-axis robots are simultaneously activated. The output ends of the two sets of six-axis robots move, driving two sets of cryogenic liquid nitrogen nozzles to the welding positions of the CCB skeleton. This achieves deep cryogenic treatment by spraying liquid nitrogen at the welding positions of the CCB skeleton. Deep cryogenic treatment can eliminate residual stress generated by welding, allowing stress to be redistributed evenly in critical areas, reducing stress concentration, improving the density and rigidity of the CCB skeleton, and enhancing the weld zone's ability to resist deformation stress caused by subsequent welding thermal cycles. This continuously suppresses the generation and accumulation of deformation during cyclic welding. In addition, deep cryogenic treatment can improve the comprehensive mechanical properties and dimensional stability of the joint, reduce the welding deformation of the CCB skeleton, improve welding quality and product reliability, and reduce the difficulty of deformation correction caused by stress accumulation.

[0015] Optionally, a third rotary cylinder is vertically arranged at the upper end of the placement platform, and two sets of the third rotary cylinder are symmetrically arranged. Two sets of limiting plates are symmetrically arranged at the upper end of the placement platform, and the two sets of limiting plates are located between the two sets of the third rotary cylinders. A first electric telescopic rod is rotatably arranged between the two sets of limiting plates and the two sets of the third rotary cylinders. The mounting ends of the two sets of the first electric telescopic rods are respectively fixedly connected to the output ends of the two sets of the third rotary cylinders. The telescopic ends of the two sets of the first electric telescopic rods are arranged through the two sets of limiting plates. A distance sensor is provided at the telescopic ends of the two sets of the first electric telescopic rods.

[0016] By adopting the above technical solution, before welding the CCB skeleton, two sets of first electric telescopic rods are simultaneously activated. The extension ends of the two sets of first electric telescopic rods move, respectively driving the two sets of distance sensors to move until the two sets of distance sensors reach the inner peripheral walls at both ends of the CCB skeleton. Subsequently, two sets of third rotary cylinders are simultaneously activated. The output ends of the two sets of third rotary cylinders rotate, driving the two sets of first electric telescopic rods to rotate. The rotation of the two sets of first electric telescopic rods drives the two sets of distance sensors to rotate. This allows initial data to be collected from the inner peripheral walls at both ends of the CCB skeleton before welding, establishing a precise reference coordinate system and providing data for subsequent deformation monitoring. For comparison purposes, during CCB skeleton welding, two sets of third rotary cylinders are simultaneously activated. The output ends of the two sets of third rotary cylinders rotate, driving the rotation of two sets of first electric telescopic rods and two sets of distance sensors, thereby detecting the deformation and relative torsion at both ends of the CCB skeleton in real time. Once the deformation exceeds the preset allowable range, the system automatically interrupts welding and prompts for adjustment of process parameters to avoid irreversible structural deformation caused by continuous stress accumulation. This reduces the difficulty and cost of post-weld correction and repair, while providing a quantitative basis for dynamic optimization of the welding process, improving the manufacturing accuracy, dimensional stability and product yield of the CCB skeleton.

[0017] Optionally, a partition is provided at the upper end of the welding platform, and the partition is located between the two sets of placement platforms, and a ring-shaped supplementary light is provided on the side wall of the laser profilometer.

[0018] By adopting the above technical solution, when welding the CCB skeleton, the partition can effectively block the direct interference of the high-intensity electric arc light on the laser profilometer during the welding process, preventing the laser profilometer from being overexposed or having a reduced signal-to-noise ratio due to receiving excessive stray light. The ring light moves with the laser profilometer and projects light evenly from multiple angles, ensuring that the laser profilometer obtains complete and clear image information when collecting data, thereby improving the accuracy and reliability of scanning and detection.

[0019] Optionally, the clamping and moving assembly includes a mounting beam, a second lead screw motor, a mounting frame, a second electric telescopic rod, and electric grippers. The mounting beam is disposed on the inner side wall of the welding frame and located above the placement platform near one end of the cold metal transition welding machine. The second lead screw motor is disposed on the side wall of the mounting beam. The mounting frame is slidably disposed on the side wall of the mounting beam and is threadedly connected to the lead screw of the second lead screw motor. Two sets of the second electric telescopic rod are symmetrically arranged, and both sets of the second electric telescopic rod are vertically disposed on the side wall of the mounting frame. Two sets of electric grippers are symmetrically arranged, and the two sets of electric grippers are respectively disposed on the telescopic ends of the two sets of the second electric telescopic rods.

[0020] By adopting the above technical solution, when the welded CCB skeleton needs to be sorted, the second lead screw motor is started. The output end of the second lead screw motor rotates, causing the mounting frame to slide along the mounting beam. The sliding of the mounting frame causes two sets of second electric telescopic rods and two sets of electric grippers to move. After moving to the designated position, the two sets of second electric telescopic rods are started simultaneously. The telescopic ends of the two sets of second electric telescopic rods move, causing the two sets of electric grippers to move until they move to the designated position. Then, the two sets of electric grippers are started to grab the CCB skeleton. After the gripping is stable, the second lead screw motor is started again. The output end of the second lead screw motor rotates, causing the mounting frame to slide along the mounting beam. The sliding of the mounting frame causes the two sets of second electric telescopic rods, the two sets of electric grippers, and the CCB skeleton to move, thereby realizing the automatic grabbing and movement of the CCB skeleton. This facilitates the removal of the welded CCB skeleton from the placement table and its transport to the designated position, achieving automated sorting and improving production efficiency.

[0021] Optionally, an infrared thermal imager for real-time monitoring of the temperature of the CCB skeleton weld zone is provided at the middle of the lower end of the mounting beam.

[0022] By adopting the above technical solution, during CCB skeleton welding, the temperature field distribution of each weld zone of the CCB skeleton is monitored in real time by an infrared thermal imager. The spacing of skip welding and the length of a single weld are automatically adjusted according to temperature changes, thereby reducing local overheating caused by differences in heat capacity of components in different functional parts. This achieves differentiated heat input control for components in different functional parts, reduces the superposition of heat fields between adjacent welds, and ensures the quality of weld formation while keeping the heat input of each weld point within a controllable range. This reduces rework and repair costs caused by temperature runaway, improves the reliability and quality of the welding process, and balances welding efficiency with deformation control. It also provides data support for quality traceability throughout the welding process.

[0023] This application also includes a transition welding process for a CCB skeleton, comprising the following steps: S1: Place a set of CCB skeletons on a set of fixtures on a set of placement tables. When a set of cold metal transition welding machines welds the clamped CCB skeletons, place another set of CCB skeletons on another set of fixtures on a set of placement tables for assembly. S2: Two sets of cold metal transition welding machines perform symmetrical welding and skip welding on the CCB skeleton after it is clamped. The welding sequence is to first weld the end plates at both ends of the CCB skeleton, then weld the steering column, and finally weld the instrument panel. When welding the steering column and instrument panel, the welding is performed from the middle to both ends. After some parts are welded, the first rotary cylinder is started to drive the two sets of placement platforms to switch positions, so that the CCB skeleton moves to the side of the cryogenic component for cryogenic treatment. At the same time, the other set of CCB skeletons moves to the welding station for welding. The two sets of CCB skeletons are alternately welded and cryogenically treated in turn until all welding is completed. S3: When welding components of different functional parts of the CCB skeleton, the temperature field distribution of each weld area of ​​the CCB skeleton is monitored in real time by an infrared thermal imager, and the spacing of the skip welding and the length of a single welding are automatically adjusted according to the temperature change. S4: After each partial welding of the CCB skeleton, the laser profilometer scans and detects the welded area. During the welding process, the distance sensor monitors the deformation and relative torsion of both ends of the CCB skeleton in real time. Then, the clamping and moving component grabs the CCB skeleton according to the detection results and sorts and transports qualified and unqualified products.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. The alternating cyclic welding mechanism in this application can perform alternating cyclic welding on two sets of CCB skeletons. First, one set of CCB skeletons is placed on the fixture of one set of placement tables. Then, the first rotary cylinder is started. The output end of the first rotary cylinder rotates, driving the welding platform and the two sets of placement tables to rotate. At this time, the two sets of cold metal transfer welding machines perform symmetrical welding and skip welding on the clamped CCB skeletons. At the same time, the second set of CCB skeletons is placed on the fixture of another set of placement tables. After the first set of CCB skeletons is partially welded, the first rotary cylinder is started again. The output end of the first rotary cylinder rotates, driving the two sets of placement tables and the two sets of CCB skeletons to switch positions. Then, the second set of CCB skeletons is symmetrically welded and skip welded. At the same time, the first set of CCB skeletons is cooled. During welding, the end plates at both ends of the CCB skeleton are welded first, followed by the welding of the steering column, and finally the welding of the instrument panel. When welding the steering column and the instrument panel, welding should be performed from the middle to both ends. The two sets of CCB skeletons are alternately cyclically welded and cooled until both sets of CCB skeletons are completely welded. This enables alternating cyclic welding at dual workstations, improving welding efficiency. Simultaneous welding from both sides by two sets of cold metal transition welding machines balances welding stress and reduces deformation. Skip welding disperses heat input, reducing heat concentration. Furthermore, welding the end plates on both sides of the CCB frame first creates a rigid, closed structure, enhancing the overall stiffness and resistance to subsequent welding thermal deformation. Then, when the overall stiffness reaches its optimal state, the steering column, requiring the highest precision, is welded to ensure assembly accuracy and positional stability. The steering column and instrument panel are welded symmetrically from the center to both ends, allowing heat to diffuse evenly from the center to both sides. The rigidity of the formed overall frame constrains weld shrinkage stress, further controlling cumulative deformation, thus achieving high-precision, low-stress welding of the entire CCB frame process. 2. The cryogenic component in this application can perform cryogenic treatment on the welded CCB skeleton. Simultaneously, two sets of six-axis robots are activated. The output ends of the two sets of six-axis robots move to move two sets of cryogenic liquid nitrogen nozzles to the welding position of the CCB skeleton, thereby achieving deep cryogenic treatment by spraying liquid nitrogen on the welding position of the CCB skeleton. Cryogenic treatment can eliminate residual stress generated by welding, allowing stress to be redistributed evenly in critical areas, reducing stress concentration, improving the density and rigidity of the CCB skeleton, and enhancing the weld area's ability to resist deformation stress caused by subsequent welding thermal cycles. This continuously suppresses the generation and accumulation of deformation during cyclic welding. In addition, cryogenic treatment can improve the comprehensive mechanical properties and dimensional stability of the joint, reduce the welding deformation of the CCB skeleton, improve welding quality and product reliability, and reduce the difficulty of deformation correction caused by stress accumulation. 3. The distance sensors in this application can detect the deformation and relative torsion at both ends of the CCB skeleton in real time. Simultaneously, two sets of first electric telescopic rods are activated. The extension ends of the two sets of first electric telescopic rods move, respectively driving the two sets of distance sensors to move until the two sets of distance sensors reach the inner circumferential walls at both ends of the CCB skeleton. Subsequently, two sets of third rotary cylinders are activated simultaneously. The output ends of the two sets of third rotary cylinders rotate, driving the two sets of first electric telescopic rods and the two sets of distance sensors to rotate. This allows for the acquisition of initial data on the inner circumferential walls at both ends of the CCB skeleton before welding, establishing a precise reference coordinate system to provide a comparative basis for subsequent deformation monitoring. During CCB skeleton welding, the two sets of distance sensors continuously rotate, thereby detecting the deformation and relative torsion at both ends of the CCB skeleton in real time. Once deformation exceeds the preset allowable range, the system automatically interrupts welding and prompts for adjustment of process parameters, avoiding continuous stress accumulation leading to irreversible structural deformation, reducing the difficulty and cost of post-weld correction and repair, and providing a quantitative basis for dynamic optimization of the welding process, improving the manufacturing accuracy, dimensional stability, and product yield of the CCB skeleton. 4. The infrared thermal imager in this application can monitor the temperature of the CCB skeleton weld area in real time. During CCB skeleton welding, the infrared thermal imager monitors the temperature field distribution of each weld area of ​​the CCB skeleton in real time, and automatically adjusts the spacing of skip welding and the length of a single weld according to temperature changes. This reduces local overheating caused by differences in heat capacity of components in different functional parts, realizes differentiated heat input control for components in different functional parts, reduces the superposition of heat fields between adjacent welds, and ensures the quality of weld formation while keeping the heat input of each weld point within a controllable range. This reduces the rework and repair costs caused by temperature runaway, improves the reliability and quality of the welding process, and balances welding efficiency and deformation control dynamically. It can also provide data support for quality traceability throughout the welding process. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the CCB skeleton; Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 3 yes Figure 2 A cross-sectional structural diagram of part of the structure; Figure 4 This is a cross-sectional structural diagram of another part of the structure; Figure 5 yes Figure 3 An enlarged schematic diagram of part A in the middle; Figure 6 yes Figure 4 Enlarged schematic diagram of part B.

[0027] Reference numerals: 1. Welding frame; 11. Placement table; 12. Welding platform; 2. Alternating cycle welding mechanism; 21. Cold metal transition welding machine; 22. First rotary cylinder; 23. Second rotary cylinder; 3. Detection component; 31. Mounting bracket; 32. First lead screw motor; 33. Mounting block; 34. Laser profilometer; 4. Cryogenic component; 41. Six-axis robot; 42. Cryogenic liquid nitrogen nozzle; 5. Third rotary cylinder; 51. Limiting plate; 52. First electric telescopic rod; 53. Distance sensor; 6. Partition plate; 61. Ring filler light; 7. Clamping and moving component; 71. Mounting beam; 72. Second lead screw motor; 73. Mounting frame; 74. Second electric telescopic rod; 75. Electric gripper; 8. Infrared thermal imager. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0029] Reference Figure 1 , Figure 1 This is a schematic diagram of the CCB skeleton in the embodiment of this application. Since the structure of the CCB skeleton and the fixture is relatively complex and they are all existing technologies, they are not shown in the overall structural diagram.

[0030] This application discloses a transition welding device for a CCB skeleton, referring to... Figure 2 , Figure 3 and Figure 4 A transition welding device for a CCB skeleton includes a CCB skeleton and a fixture. The CCB skeleton is placed on the fixture. A placement platform 11 is rotatably mounted on the lower end of the fixture. Two sets of placement platforms 11 are symmetrically arranged. Welding platforms 12 are rotatably mounted on the lower ends of the two sets of placement platforms 11. An alternating cycle welding mechanism 2 is mounted on one side of the welding platform 12. A cryogenic component 4 is mounted on the side of the welding platform 12 away from the alternating cycle welding mechanism 2. A welding frame 1 is fixedly mounted on the outer side of the welding platform 12. A clamping and moving component 7 is mounted on the frame of the welding frame 1.

[0031] The CCB skeleton is placed on the placement platform 11 and held securely by a clamp. Then, the CCB skeleton is alternately welded by the alternating cycle welding mechanism 2 on one side of the welding platform 12 in this embodiment. While welding, the CCB skeleton on another set of placement platforms 11 is clamped. After partial welding of the CCB skeleton, the welded parts are cryogenically treated by the cryogenic component 4. While cryogenically treating, the other set of CCB skeletons is welded. After cryogenic treatment is completed, the alternating cycle welding is performed again. After all the CCB skeletons on both sets of placement platforms 11 are welded, the clamping and moving component 7 on the welding frame 1 sorts the welded CCB skeletons. This achieves synchronous alternating operation of welding and cryogenic treatment, effectively controls the welding heat input and cooling rate, improves the weld microstructure and properties, reduces welding deformation, and improves welding efficiency by utilizing the alternating cycle of the two sets of placement platforms 11, reducing manual intervention.

[0032] Reference Figure 2 , Figure 3 and Figure 4 To enable the two sets of CCB skeletons to perform alternating cyclic welding, the alternating cyclic welding mechanism 2 in this embodiment includes a cold metal transition welder 21, a first rotary cylinder 22, a rotating component, and a detection component 3. Two sets of cold metal transition welders 21 are symmetrically arranged, and both sets of cold metal transition welders 21 are bolted to one side of the welding platform 12. The first rotary cylinder 22 is bolted to the lower end of the welding platform 12, and its output end is fixedly connected to the lower end of the welding platform 12. The rotating component is installed on the welding platform 12, and the detection component 3 is installed on the inner wall of the welding frame 1.

[0033] First, a set of CCB skeletons is placed on the fixture of a set of placement platforms 11. Then, the first rotary cylinder 22 is started. The output end of the first rotary cylinder 22 rotates, driving the welding platform 12 and the two sets of placement platforms 11 to rotate. At this time, the two sets of cold metal transition welding machines 21 perform symmetrical welding and skip welding on the clamped CCB skeletons. At the same time, the second set of CCB skeletons is placed on the fixture of another set of placement platforms 11. After the first set of CCB skeletons is partially welded, the first rotary cylinder 22 is started again. The output end of the first rotary cylinder 22 rotates, driving the two sets of placement platforms 11 and the two sets of CCB skeletons to switch positions. Then, the second set of CCB skeletons is symmetrically welded and skip welded. At the same time, the first set of CCB skeletons is cooled. During welding, the end plates at both ends of the CCB skeleton are welded first, followed by the welding of the steering column, and finally the welding of the instrument panel. When welding the steering column and the instrument panel, welding should be performed from the middle to both ends. The two sets of CCB skeletons are alternately welded and cooled in turn until the two sets of CCB skeletons are completely welded. This enables alternating cyclic welding at dual workstations, improving welding efficiency. Two sets of cold metal transition welding machines 21 weld simultaneously on both sides, balancing welding stress and reducing deformation. Skip welding disperses heat input and reduces heat concentration. Furthermore, welding the end plates on both sides of the CCB frame first allows the CCB frame to form a rigid closed structure, improving the overall rigidity of the CCB frame and its ability to resist subsequent welding thermal deformation. Then, when the overall rigidity reaches its optimal state, the steering column, which has the highest precision requirements, is welded to ensure its assembly accuracy and positional stability. When welding the steering column and instrument panel, a symmetrical welding method is adopted from the middle to both ends, allowing heat to diffuse evenly from the center to both sides. The rigidity of the formed overall frame is used to constrain the weld shrinkage stress, further controlling the cumulative deformation, thereby achieving high-precision, low-stress welding of the entire CCB frame process. In this embodiment, the welding frame 1 is equipped with a controller on its side wall for controlling two sets of cold metal transfer welding machines 21. The controller controls the two sets of cold metal transfer welding machines 21 to perform symmetrical welding and skip welding on the CCB skeleton, and to perform alternating cyclic welding on the CCB skeleton according to a predetermined welding sequence and welding process. In this embodiment, an automatic torch cleaner is provided between the two sets of cold metal transfer welding machines 21. The automatic torch cleaner can clean the welding torch nozzle online, effectively removing spatter adhering to the inner wall of the nozzle, thereby ensuring the stable combustion of the arc and the gas protection effect during subsequent welding. At the same time, the automatic torch cleaner can precisely trim the welding wire tip, so that each weld can be formed under the preset optimal heat input, thereby indirectly suppressing the thermal deformation induced by the fluctuation of the welding process and improving the uniformity and reliability of the overall welding quality.

[0034] Reference Figure 5 When the welding angle of the CCB skeleton needs to be adjusted, the rotating component in this embodiment includes a second rotating cylinder 23. Two sets of the second rotating cylinder 23 are symmetrically arranged. Both sets of the second rotating cylinder 23 are vertically bolted to the upper end of the welding platform 12, and the output ends of the two sets of the second rotating cylinder 23 are respectively fixedly connected to the two ends of the placement table 11.

[0035] Two sets of second rotary cylinders 23 are activated simultaneously. The output ends of the two sets of second rotary cylinders 23 rotate, driving the placement platform 11 to rotate. The rotation of the placement platform 11 drives the CCB skeleton to rotate, thereby achieving precise adjustment of the welding angle of the CCB skeleton. This allows the weld, which was originally in the overhead welding position, to rotate to the flat welding position for welding. In the flat welding position, the molten pool metal spreads naturally under the action of gravity and is not easy to flow, which is conducive to the floating of slag and the escape of gas. This reduces defects such as weld beads, undercut, and lack of fusion that are common in overhead welding, improves the internal quality and appearance of the weld, enhances welding reliability and the durability of the overall product structure, and can also meet the welding requirements of complex welds, improving welding flexibility.

[0036] Reference Figure 5 After alternating cyclic welding, the CCB skeleton needs to be inspected. Therefore, the inspection component 3 in this embodiment includes a mounting frame 31, a first lead screw motor 32, a mounting block 33, and a laser profilometer 34. The mounting frame 31 is welded to the inner wall of the welding frame 1 and is located above the placement platform 11 at the end away from the cold metal transition welder 21. The first lead screw motor 32 is bolted to the side wall of the mounting frame 31. The mounting block 33 is slidably mounted on the lower end of the mounting frame 31 and is threadedly connected to the lead screw of the first lead screw motor 32. The laser profilometer 34 is bolted to the lower end of the mounting block 33.

[0037] The first lead screw motor 32 is started, and the output end of the first lead screw motor 32 rotates, driving the mounting block 33 to slide along the mounting frame 31. The sliding of the mounting block 33 drives the laser profilometer 34 to slide, thereby realizing automatic scanning and detection of the CCB skeleton, accurately acquiring the CCB skeleton contour data, and evaluating the welding quality. When inspecting the CCB skeleton after welding at certain locations, if deformation exceeds the allowable range, the welding operation can be stopped in time to prevent stress from accumulating and causing overall structural failure, reducing the difficulty and cost of subsequent correction and repair. This full-process scanning and detection mechanism not only realizes online prevention and process control of welding quality, but also provides data support for the dynamic optimization of welding process parameters, improving the welding accuracy, yield rate and structural stability of the CCB skeleton. In addition, scanning the clamped CCB skeleton before welding can accurately verify the fit and relative position of the parts and the fixture, ensuring that key indicators such as weld assembly gap and misalignment meet the process requirements, and reducing welding defects caused by improper clamping.

[0038] Reference Figure 3 and Figure 5 In order to perform cryogenic treatment on the welding position of the CCB skeleton, the cryogenic component 4 in this embodiment includes a six-axis robot 41 and a cryogenic liquid nitrogen nozzle 42. Two sets of six-axis robots 41 are symmetrically arranged, and both sets of six-axis robots 41 are bolted to the side of the welding platform 12 away from the cold metal transition welding machine 21. Two sets of cryogenic liquid nitrogen nozzles 42 are symmetrically arranged, and the two sets of cryogenic liquid nitrogen nozzles 42 are respectively fixedly installed on the output end of the two sets of six-axis robots 41.

[0039] Simultaneously, two sets of six-axis robots 41 are activated. The output ends of the two sets of six-axis robots 41 move, driving two sets of cryogenic liquid nitrogen nozzles 42 to the welding position of the CCB skeleton. This achieves deep cryogenic treatment by spraying liquid nitrogen at the welding position of the CCB skeleton. Deep cryogenic treatment can eliminate residual stress generated by welding, allowing stress to be redistributed evenly in critical areas, reducing stress concentration, improving the density and rigidity of the CCB skeleton, and enhancing the weld area's ability to resist deformation stress caused by subsequent welding thermal cycles. This continuously suppresses the generation and accumulation of deformation during cyclic welding. In addition, deep cryogenic treatment can improve the comprehensive mechanical properties and dimensional stability of the joint, reduce the welding deformation of the CCB skeleton, improve welding quality and product reliability, and reduce the difficulty of deformation correction caused by stress accumulation.

[0040] Reference Figure 5 During the welding of the CCB skeleton, the two ends may twist or deform. Therefore, in this embodiment, the upper end of the placement platform 11 is vertically bolted with a third rotary cylinder 5, and two sets of the third rotary cylinder 5 are symmetrically arranged. Two sets of limiting plates 51 are symmetrically welded to the upper end of the placement platform 11, and the two sets of limiting plates 51 are located between the two sets of third rotary cylinders 5. A first electric telescopic rod 52 is rotatably installed between the two sets of limiting plates 51 and the two sets of third rotary cylinders 5. The installation ends of the two sets of first electric telescopic rods 52 are respectively fixedly connected to the output ends of the two sets of third rotary cylinders 5. The telescopic ends of the two sets of first electric telescopic rods 52 are set through the two sets of limiting plates 51. A distance sensor 53 is fixedly installed on the telescopic ends of the two sets of first electric telescopic rods 52.

[0041] Two sets of first electric telescopic rods 52 are activated simultaneously. The telescopic ends of the two sets of first electric telescopic rods 52 move, respectively driving the two sets of distance sensors 53 to move until the two sets of distance sensors 53 move to the inner peripheral walls at both ends of the CCB skeleton. Then, two sets of third rotary cylinders 5 are activated simultaneously. The output ends of the two sets of third rotary cylinders 5 rotate, driving the two sets of first electric telescopic rods 52 to rotate. The rotation of the two sets of first electric telescopic rods 52 drives the two sets of distance sensors 53 to rotate. This allows the initial data of the inner peripheral walls at both ends of the CCB skeleton to be collected before welding, establishing a precise reference coordinate system and providing a basis for comparison for subsequent deformation monitoring. During CCB frame welding, two sets of third rotary cylinders 5 are activated simultaneously. The output ends of the two sets of third rotary cylinders 5 rotate, driving the rotation of two sets of first electric telescopic rods 52 and two sets of distance sensors 53, thereby detecting the deformation and relative torsion at both ends of the CCB frame in real time. Once the deformation exceeds the preset allowable range, the system automatically interrupts the welding and prompts for adjustment of process parameters to avoid irreversible structural deformation caused by continuous stress accumulation. This reduces the difficulty and cost of post-weld correction and repair, while providing a quantitative basis for dynamic optimization of the welding process, improving the manufacturing accuracy, dimensional stability and product yield of the CCB frame.

[0042] Reference Figure 3 and Figure 5 In this embodiment, a partition 6 is fixedly installed on the upper end of the welding platform 12, and the partition 6 is located between two sets of placement platforms 11. A ring-shaped supplementary light 61 is fixedly installed on the side wall of the laser profilometer 34. The partition 6 can effectively block the direct interference of high-intensity arc light to the laser profilometer 34 during the welding process, and prevent the laser profilometer 34 from receiving excessive stray light, resulting in overexposure of the image or a decrease in the signal-to-noise ratio. The ring-shaped supplementary light 61 moves with the laser profilometer 34 and projects light evenly from multiple angles to ensure that the laser profilometer 34 obtains complete and clear image information when collecting data, thereby improving the accuracy and reliability of scanning detection.

[0043] Reference Figure 2 and Figure 6 In order to sort the welded CCB skeleton, the clamping and moving assembly 7 in this embodiment includes a mounting beam 71, a second lead screw motor 72, a mounting frame 73, a second electric telescopic rod 74, and an electric gripper 75. The mounting beam 71 is welded to the inner side wall of the welding frame 1 and is located above the placement platform 11 near one end of the cold metal transition welding machine 21. The second lead screw motor 72 is bolted to the side wall of the mounting beam 71. The mounting frame 73 is slidably mounted on the side wall of the mounting beam 71 and is threadedly connected to the lead screw of the second lead screw motor 72. Two sets of second electric telescopic rods 74 are symmetrically arranged, and both sets of second electric telescopic rods 74 are vertically bolted to the side wall of the mounting frame 73. Two sets of electric grippers 75 are symmetrically arranged, and the two sets of electric grippers 75 are respectively fixedly installed on the telescopic ends of the two sets of second electric telescopic rods 74.

[0044] The second lead screw motor 72 is started. The output end of the second lead screw motor 72 rotates, causing the mounting frame 73 to slide along the mounting beam 71. The sliding of the mounting frame 73 causes the two sets of second electric telescopic rods 74 and the two sets of electric grippers 75 to move. After moving to the designated position, the two sets of second electric telescopic rods 74 are started simultaneously. The telescopic ends of the two sets of second electric telescopic rods 74 move, causing the two sets of electric grippers 75 to move until they move to the designated position. Then, the two sets of electric grippers 75 are started to grip the CCB frame. After the gripping is stable, the second lead screw motor 72 is started again. The output end of the second lead screw motor 72 rotates, causing the mounting frame 73 to slide along the mounting beam 71. The sliding of the mounting frame 73 causes the two sets of second electric telescopic rods 74, the two sets of electric grippers 75, and the CCB frame to move. The B-frame moves, thereby realizing the automatic gripping and movement of the CCB frame, facilitating the removal of the welded CCB frame from the placement table 11 and its transport to a designated location, achieving automated sorting and improving production efficiency. In this embodiment, both sets of electric grippers 75 are equipped with flexible clamping pads. The flexible clamping pads can increase the contact area between the grippers and the surface of the CCB frame and buffer the clamping force, reducing local indentations, surface coating damage, or secondary stress deformation caused by the rigid grippers directly acting on the welded high-precision frame. In particular, it plays an effective physical protection role for thin-walled tube beams and precision supports, thereby ensuring the stability of the sorting and unloading process, protecting the geometric accuracy and surface quality of the welded finished products, and improving the reliability of automated handling.

[0045] Reference Figure 6 In this embodiment, an infrared thermal imager 8 is fixedly installed at the middle of the lower end of the mounting beam 71. During CCB skeleton welding, the infrared thermal imager 8 monitors the temperature field distribution of each weld area of ​​the CCB skeleton in real time. Based on temperature changes, it automatically adjusts the spacing of skip welding and the length of a single weld, thereby reducing local overheating caused by differences in heat capacity of components in different functional parts. This achieves differentiated heat input control for components in different functional parts, reduces the superposition of heat fields between adjacent welds, and ensures the quality of weld formation while keeping the heat input of each weld point within a controllable range. This reduces rework and repair costs caused by temperature runaway, improves the reliability and quality of the welding process, and balances welding efficiency with deformation control. It also provides data support for quality traceability throughout the welding process.

[0046] This application also discloses a transition welding process for a CCB skeleton, including the following steps: S1: Place a set of CCB skeletons on a set of fixtures on a set of placement tables 11. When a set of cold metal transition welding machines 21 welds the clamped CCB skeletons, place another set of CCB skeletons on another set of fixtures on a set of placement tables 11 for assembly. S2: Two sets of cold metal transition welding machines 21 perform symmetrical welding and skip welding on the CCB skeleton after it is clamped. The welding sequence is to first weld the end plates at both ends of the CCB skeleton, then weld the steering column, and finally weld the instrument panel. When welding the steering column and the instrument panel, the welding is performed from the middle to both ends. After some parts are welded, the first rotary cylinder 22 is started to drive the two sets of placement tables 11 to switch positions, so that the CCB skeleton moves to the side of the cryogenic component 4 for cryogenic treatment. At the same time, the other set of CCB skeletons moves to the welding station for welding. The two sets of CCB skeletons are alternately welded and cryogenically treated in turn until all welding is completed. S3: When welding components of different functional parts of the CCB skeleton, the temperature field distribution of each weld area of ​​the CCB skeleton is monitored in real time by infrared thermal imager 8, and the spacing of skip welding and the length of single welding are automatically adjusted according to temperature changes. S4: After each partial welding of the CCB skeleton, the laser profilometer 34 scans and detects the welded part. During the welding process, the distance sensor 53 monitors the deformation and relative torsion of both ends of the CCB skeleton in real time. Then, the clamping and moving component 7 grabs the CCB skeleton according to the detection results and sorts and transports qualified and unqualified products.

[0047] The implementation principle of the transition welding device and welding process for CCB skeleton in this application embodiment is as follows: First, a set of CCB skeletons is placed on the fixture of a set of placement platforms 11. Then, the first rotary cylinder 22 is started. The output end of the first rotary cylinder 22 rotates, driving the welding platform 12 and the two sets of placement platforms 11 to rotate. At this time, the two sets of cold metal transition welding machines 21 perform symmetrical welding and skip welding on the clamped CCB skeletons. At the same time, the second set of CCB skeletons is placed on the fixture of another set of placement platforms 11. After the first set of CCB skeletons is partially welded, the first rotary cylinder 22 is started again. The output end of the first rotary cylinder 22 rotates, driving the two sets of placement platforms 11 and the two sets of CCB skeletons to switch positions. Then, the second set of CCB skeletons is symmetrically welded and skip welded. At the same time, the first set of CCB skeletons is cooled. During welding, the end plates at both ends of the CCB skeleton are welded first, followed by the welding of the steering column, and finally the welding of the instrument panel. When welding the steering column and the instrument panel, welding should be performed from the middle to both ends. The two sets of CCB skeletons are alternately welded and cooled in turn until the two sets of CCB skeletons are completely welded. Simultaneously, two sets of six-axis robots 41 are activated. The output ends of the two sets of six-axis robots 41 move to drive two sets of cryogenic liquid nitrogen nozzles 42 to the welding position of the CCB skeleton, thereby achieving deep cryogenic treatment by spraying liquid nitrogen at the welding position of the CCB skeleton. Two sets of first electric telescopic rods 52 are started simultaneously. The telescopic ends of the two sets of first electric telescopic rods 52 move, respectively driving the two sets of distance sensors 53 to move until the two sets of distance sensors 53 move to the inner peripheral walls at both ends of the CCB skeleton. Then, two sets of third rotary cylinders 5 are started simultaneously. The output ends of the two sets of third rotary cylinders 5 rotate, driving the two sets of first electric telescopic rods 52 and the two sets of distance sensors 53 to rotate, thereby collecting initial data of the inner peripheral walls at both ends of the CCB skeleton before welding. During the welding of the CCB skeleton, the two sets of distance sensors 53 continue to rotate, thereby detecting the deformation and relative torsion at both ends of the CCB skeleton in real time. When welding components of different functional parts of the CCB skeleton, the temperature field distribution of each weld zone of the CCB skeleton is monitored in real time by an infrared thermal imager 8, and the spacing of the skip welding and the length of a single welding are automatically adjusted according to the temperature changes.

[0048] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0049] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A transition welding device for a CCB skeleton, comprising a CCB skeleton and a fixture, characterized in that: The CCB skeleton is placed on the fixture, and a placement platform (11) is rotatably provided at the lower end of the fixture. Two sets of placement platforms (11) are symmetrically arranged. Welding platforms (12) are rotatably provided at the lower ends of the two sets of placement platforms (11). An alternating cycle welding mechanism (2) is provided on one side of the welding platform (12) for alternating cycle welding of the two sets of CCB skeletons on the two sets of placement platforms (11). A cryogenic component (4) for cryogenic treatment of the CCB skeleton after alternating cycle welding is provided on the side of the welding platform (12) away from the alternating cycle welding mechanism (2). A welding frame (1) is provided on the outside of the welding platform (12). A clamping and moving component (7) for sorting the welded CCB skeleton is provided on the frame of the welding frame (1).

2. The transition welding device for a CCB skeleton according to claim 1, characterized in that: The alternating cycle welding mechanism (2) includes a cold metal transition welder (21), a first rotary cylinder (22), a rotating component, and a detection component (3). Two sets of cold metal transition welders (21) are symmetrically arranged, and both sets of cold metal transition welders (21) are located on one side of the welding platform (12). The first rotary cylinder (22) is located at the lower end of the welding platform (12), and its output end is fixedly connected to the lower end of the welding platform (12). The rotating component is located on the welding platform (12) and is used to rotate the placement table (11). The detection component (3) is located on the inner wall of the welding frame (1) and is used to detect the CCB skeleton after alternating cycle welding.

3. The transition welding device for a CCB skeleton according to claim 2, characterized in that: The rotating component includes a second rotating cylinder (23), and two sets of the second rotating cylinder (23) are symmetrically arranged. Both sets of the second rotating cylinder (23) are vertically arranged at the upper end of the welding platform (12), and the output ends of the two sets of the second rotating cylinder (23) are respectively fixedly connected to the two ends of the placement table (11).

4. The transition welding device for a CCB skeleton according to claim 2, characterized in that: The detection component (3) includes a mounting frame (31), a first lead screw motor (32), a mounting block (33), and a laser profilometer (34). The mounting frame (31) is disposed on the inner side wall of the welding frame (1) and is located above the placement platform (11) at the end away from the cold metal transition welding machine (21). The first lead screw motor (32) is disposed on the side wall of the mounting frame (31). The mounting block (33) is slidably disposed on the lower end of the mounting frame (31) and is threadedly connected to the lead screw of the first lead screw motor (32). The laser profilometer (34) is disposed on the lower end of the mounting block (33).

5. A transition welding device for a CCB skeleton according to claim 2, characterized in that: The cryogenic component (4) includes a six-axis robot (41) and a cryogenic liquid nitrogen nozzle (42). Two sets of the six-axis robots (41) are symmetrically arranged, and both sets of the six-axis robots (41) are located on the side of the welding platform (12) away from the cold metal transition welding machine (21). Two sets of cryogenic liquid nitrogen nozzles (42) are symmetrically arranged, and the two sets of cryogenic liquid nitrogen nozzles (42) are respectively located on the output end of the two sets of six-axis robots (41).

6. The transition welding device for a CCB skeleton according to claim 1, characterized in that: The upper end of the placement platform (11) is vertically provided with a third rotary cylinder (5), and two sets of the third rotary cylinder (5) are symmetrically arranged. The upper end of the placement platform (11) is symmetrically provided with two sets of limiting plates (51), and the two sets of limiting plates (51) are located between the two sets of the third rotary cylinder (5). A first electric telescopic rod (52) is rotatably arranged between the two sets of limiting plates (51) and the two sets of the third rotary cylinder (5). The mounting ends of the two sets of the first electric telescopic rod (52) are respectively fixedly connected to the output ends of the two sets of the third rotary cylinder (5). The telescopic ends of the two sets of the first electric telescopic rod (52) are all arranged through the two sets of limiting plates (51). A distance sensor (53) is provided at the telescopic ends of the two sets of the first electric telescopic rod (52).

7. A transition welding device for a CCB skeleton according to claim 4, characterized in that: The upper end of the welding platform (12) is provided with a partition (6), and the partition (6) is located between the two sets of the placement platforms (11). A ring-shaped supplementary light (61) is provided on the side wall of the laser profilometer (34).

8. A transition welding device for a CCB skeleton according to claim 2, characterized in that: The clamping and moving assembly (7) includes a mounting beam (71), a second lead screw motor (72), a mounting frame (73), a second electric telescopic rod (74), and electric grippers (75). The mounting beam (71) is disposed on the inner side wall of the welding frame (1) and located above the placement platform (11) near one end of the cold metal transition welding machine (21). The second lead screw motor (72) is disposed on the side wall of the mounting beam (71). The mounting frame (73) is slidably disposed on the side wall of the mounting beam (71) and is threadedly connected to the lead screw of the second lead screw motor (72). Two sets of the second electric telescopic rods (74) are symmetrically arranged, and both sets of the second electric telescopic rods (74) are vertically disposed on the side wall of the mounting frame (73). Two sets of the electric grippers (75) are symmetrically arranged, and the two sets of electric grippers (75) are respectively disposed on the telescopic ends of the two sets of the second electric telescopic rods (74).

9. A transition welding device for a CCB skeleton according to claim 8, characterized in that: An infrared thermal imager (8) for real-time monitoring of the temperature of the CCB skeleton weld zone is provided at the middle of the lower end of the mounting beam (71).

10. A transition welding process for a CCB skeleton, and a transition welding apparatus for a CCB skeleton according to any one of claims 1-9, characterized in that: Includes the following steps: S1: Place a set of CCB skeletons on the fixture of a set of placement tables (11). When a set of cold metal transition welding machines (21) welds the clamped CCB skeletons, place another set of CCB skeletons on the fixture of another set of placement tables (11) for assembly. S2: Two sets of cold metal transition welding machines (21) perform symmetrical welding and skip welding on the CCB skeleton after clamping. The welding sequence is to first weld the end plates at both ends of the CCB skeleton, then weld the steering column, and finally weld the instrument panel. When welding the steering column and the instrument panel, the welding is performed from the middle to both ends. After welding some positions, the first rotary cylinder (22) is started to drive the two sets of placement tables (11) to switch positions, so that the CCB skeleton moves to the side of the cryogenic component (4) for cryogenic treatment. At the same time, the other set of CCB skeletons moves to the welding station for welding. The two sets of CCB skeletons are alternately cyclically welded and cryogenically treated until all welding is completed. S3: When welding different functional parts of the CCB skeleton, the temperature field distribution of each weld area of ​​the CCB skeleton is monitored in real time by an infrared thermal imager (8), and the spacing of the skip welding and the length of a single welding are automatically adjusted according to the temperature change. S4: After each CCB skeleton part is welded, the laser profilometer (34) scans and detects the welded part. During the welding process, the distance sensor (53) monitors the deformation and relative twist at both ends of the CCB skeleton in real time. Then, the clamping moving component (7) grabs the CCB skeleton according to the detection results and sorts and transports qualified and unqualified products.

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