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Characteristics and Applications of Welding Robots


Welding robots are industrial robots engaged in welding. According to the definition of the International Organization for Standardization that an Industrial Robot is a standard welding robot, an industrial robot is a multi-purpose, reprogrammable automatic control manipulator with three or more programmable axes and is used in the field of industrial automation. In order to adapt to different uses, the mechanical interface of the last axis of the robot is usually a connecting flange, which can be connected to different tools or end effectors. Welding robots attach welding tongs or welding guns to the final shaft flange of industrial robots to enable welding, cutting or thermal spraying.


Spot Welding

Spot Welding


Features


Spot Welding does not require very high welding robots. Because spot welding only needs point position control, there is no strict requirement for the trajectory of the welding clamp between points, which is why the robot can only be used for spot welding at the earliest. Spot welding robots must not only have sufficient load capacity, but also need to be fast when shifting from point to point, movement must be stable, and positioning must be accurate to reduce the shifting time and improve work efficiency.


The load capacity of the spot welding robot depends on the type of welding gun used. For welding guns that are separated from the transformer, a robot with a load of 30~45kg is sufficient. However, this kind of welding tongs on the one hand, due to the long secondary cable, has a large power loss, and it is also not conducive to the robot to extend the welding tongs into the workpiece for welding; on the other hand, the cable keeps swinging with the robot movement, and the cable is damaged quickly . Therefore, the use of one-piece welding guns is gradually increasing. The weight of this welding tongs together with the transformer is about 70kg. Considering that the robot must have enough load capacity to send the welding gun to the space position for welding with a large acceleration, a heavy-duty robot with a load of 100~150kg is generally used. In order to meet the requirement of short-distance rapid displacement of the welding tongs during continuous spot welding. The new heavy-duty robot has the function of completing a 50mm displacement in 0.3s. This puts forward higher requirements on the performance of the motor, the calculation speed of the microcomputer and the algorithm.


Application


Application in automobile production


Welding Robots have been widely used in the automobile manufacturing industry. Welding of automobile chassis, seat frames, guide rails, mufflers and torque converters has been widely used in automobile chassis welding production. Toyota has decided to use spot welding as a standard to equip all its spot welding robots in Japan and overseas. Using this technology can improve the quality of welding, so even trying to use it to replace some arc welding operations. The exercise time in short distances is also greatly shortened. The company recently launched a low-height spot welding robot, which is used to weld lower parts of the car body. This short spot welding robot can also be assembled with a taller robot to jointly process the upper part of the car body, thereby shortening the length of the entire welding production line. Domestically produced car chassis parts such as Santana, Passat, Buick, Sail, Polo, etc., such as rear axles, sub-frames, rocker arms, suspensions, shock absorbers, etc., are mostly force-bearing safety parts based on MIG welding technology. The main components are Using stamping welding, the average thickness of the plate is 1.5~4mm. The welding is mainly in the form of lap joints and corner joints. The welding quality requirements are quite high, and the quality of its quality directly affects the safety performance of the car. After the application of robot welding, the appearance and internal quality of the welded parts are greatly improved, and the stability of the quality is guaranteed, the labor intensity is reduced, and the labor environment is improved.


Underwater application


As an important part of ocean engineering equipment technology, ocean welding has now become an indispensable foundation and supporting technology for ocean resource development and ocean engineering construction. After a large number of process tests and formula adjustments, the welding materials and special underwater welding equipment developed and developed have been successfully applied to marine projects such as the Shengli Oilfield offshore oil production platform and the Hong Kong-Zhuhai-Macao Bridge.


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