High-frequency inverting DC resistance welding power supply based aluminum spot welding system and method

Abstract

The invention provides a high-frequency inverting DC resistance welding power supply based aluminum spot welding system and method. The system is characterized by comprising a resistance welding power supply, a high-frequency transformer, a high-frequency secondary rectifying unit, an electrode unit, a voltage monitoring unit, a voltage feedback unit and a current feedback unit, wherein the voltage monitoring unit is connected to a main control panel and is used for performing pressure detection feedback and controlling an electrode holder servo motor to pressurize a workpiece based on the set pressure; the main control panel is connected to the voltage monitoring unit, the voltage feedback unit and the current feedback unit so as to acquire welding pressure, secondary voltage and secondary current. According to the system, the inverting frequency is 10KHz; 20000 groups of data points can be acquired per second based on the output waveform of the acquired secondary current, so that the system acquiring rate is increased, and the welding process can be accurately controlled.

Description

technical field [0001] The invention relates to the field of resistance welding, in particular to a system and method for aluminum spot welding based on a high-frequency inverter DC resistance welding power supply. Background technique [0002] In today's society, as people's demand for environmental protection and energy saving and emission reduction increases, automobile lightweight, as the most effective and direct method to reduce fuel consumption and gas emissions, has become the trend of the world's automobile manufacturing. With its outstanding performance and advantages, aluminum alloy shines brightly in lightweight materials, and is favored by many manufacturers and used in some models. Resistance spot welding, as one of the automobile body joining processes, is widely used for its reliable quality, high efficiency, economy and easy use of robots for automatic welding. However, due to the physical and chemical properties of aluminum alloy itself, such as high elect...

AI Technical Summary

Problems solved by technology

However, due to the physical and chemical properties of aluminum alloy itself, such as high electrical conductivity, high thermal conductivity, low melting point, and easy oxidation, the aluminum alloy resistance spot welding is quite different from the traditional steel resistance spot welding. Welding time, large welding current, high welding pressure, etc. Although relevant researches have been carried out from different directions at home and abroad, most of them still stay in the laboratory stage, and the effect of aluminum spot welding technology that has entered the practical stage is not ideal. , the main problem is that the transformer is large in size, the welding tongs have to bear a lot of pressure, which puts forward higher requirements for the load structure design of the welding tongs, the controller or welding power supply has high power, high cost, and the frequency of electrode grinding is high. Electrode strips or electrode structures, etc.

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