“According to incomplete statistics, nearly half of the industrial robots in service in the world are used in various forms of welding and processing. There are two main ways in the application of welding robots, namely spot welding and arc welding. Some of these welding robots are specially designed for a certain welding method, and most of the welding robots are actually general-purpose industrial robots equipped with a certain welding tool.
According to incomplete statistics, nearly half of the industrial robots in service in the world are used in various forms of welding and processing. There are two main ways in the application of welding robots, namely spot welding and arc welding. Some of these welding robots are specially designed for a certain welding method, and most of the welding robots are actually general-purpose industrial robots equipped with a certain welding tool.
The application of industrial robots in the welding field first started with resistance spot welding on automobile assembly lines. The reason is that the process of resistance spot welding is relatively simple, easy to control, and does not require welding seam trajectory tracking, and the control requirements for the accuracy and repeatability of the robot are relatively low.
Let’s take a look at the four key technologies of welding robots in the automotive field.
Seam tracking technology
In the application process of robots, the application of welding seam tracking technology is quite common. In the welding operation process summary, the welding process may be subject to strong arc radiation, smoke, spatter, machining errors, fixture accuracy, thermal deformation of the workpiece, etc. Due to the influence of factors, special attention should be paid to the control of these factors to avoid the deviation of the welding torch from the welding seam, which may cause welding quality problems. The existence of welding seam tracking technology can, to a certain extent, combine the changes in welding conditions to monitor the weld seam in real time. Deviations, and adjust the welding path and welding parameters in time to effectively avoid quality problems in the welding process.
Offline programming and path planning technology
In the operation process of welding operation, offline programming and path planning technology mainly refers to the further expansion of the robot programming language. It mainly uses the research results of computer graphics to establish the model of the robot’s working environment, and through professional algorithms, the welding The graphics of the device are controlled and operated to a certain extent, which is to promote the robot to perform welding operations on the basis of the set trajectory planning. Another realistic basis for offline programming is the application of automatic programming technology. Through the application of automatic programming technology, in order to achieve welding tasks, welding parameters, welding paths and welding tracks, a technology that assists programmers in programming tasks.
Multi-robot coordinated control technology
In the actual work process, the multi-robot coordinated control technology mainly refers to a system that selects a number of robots to complete a certain work task through cooperation and coordination. The multi-robot coordinated control technology is mainly used in the application process. Before arranging a task in multiple systems, it is necessary to consider how to organize the equipment to perform effective work according to the actual operation task. After determining the working mechanism, it is necessary to consider how to maintain the consistency of the robot’s motion coordination in combination with actual work.
Dedicated arc welding power supply
Continuous practical work experience shows that in the system, a special arc welding power source with good electrical performance is one of the keys to ensure the normal performance of the equipment. Most of the special arc welding inverter power supplies used by robots are monolithic microcomputer controlled transistor arc welding inverters. The welding power supply with fine waveform control method can ensure the consistency of weld width and depth to a certain extent. It promotes the welding surface to be more beautiful. Therefore, in the application process, it is very important to conduct in-depth research on the special arc welding power source.
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