In the automotive industry, welding is a key link in the manufacture of automotive parts and bodywork. It plays a leading role in the automotive industry. At the same time, there are many models of automotive products, complex molding structures, specialized parts production, standardization, and quality and efficiency of automobile manufacturing. The comprehensive requirements of cost and other aspects have determined that automotive welding processing is a multidisciplinary, cross-disciplinary and technologically integrated production process. In the current manufacturing of automotive parts and body-in-white, the main welding methods are resistance spot welding, CO2 gas shielded welding and laser welding, as well as argon arc welding and resistance beam welding.
Current status of welding technology in the automotive industry
1. Arc welding technology
In the automotive industry, in addition to the electric resistance welding method, another major welding method is the arc welding method. With the development in recent years, the arc welding method is fully applied in the automobile enterprise, and it blooms everywhere. For example, traditional manual arc welding has been banned, and all CO2 welding methods have been realized. In the car companies, MIG/MAG welding methods have been widely used.
Arc welding technology has been rapidly improved with the development of electric power, electronic components and computer technology. After years of development, from the original rotary DC welding machine to diode rectifier welding machine, thyristor (SCR) rectifier welding machine, Transistor rectification welder, inverter welder, all-digital inverter welding machine up to now, and the welding machine with independent intellectual property rights in China is only thyristor (sCR) rectification welder and only simple The function of the inverter welding machine is also a relatively large number of welding machines used by domestic manufacturers. The all-digital inverter welding machine, twin-wire pulse technology and CMT-enabled technology are in the hands of foreign manufacturers. These technologies and equipment will obviously bring about a significant improvement in our welding quality, but because of its high cost. It will take some time to apply.
In the next few years, the manual arc welding method will disappear in our production, and only for repair and repair, inverter welding opportunities are increasingly applied to welding production, in addition to joint ventures, some domestic enterprises Also try to apply new arc welding methods, such as: digital welding machine, pulse welding machine, etc., in addition to CO2 welding methods, will also try more applications of MIG / MAG welding to improve the welding quality of arc welding.
2. Medium frequency welding technology
In recent years, some foreign manufacturers that produce large quantities of automobiles have applied intermediate frequency welding technology to the car body-in-white welding line. In Europe, the use of medium frequency spot welding robots has accounted for 40% and has expanded to the spot welding of aluminum alloy car bodies. The joint ventures around us, such as FAW-Volkswagen, use a lot of medium-frequency welding equipment.
Due to the high efficiency and energy saving advantages of the medium frequency inverter welding machine, in the global promotion of energy saving, environmentally friendly and low carbon life, the medium frequency welding technology should be actively adopted in the automobile manufacturing industry.
The intermediate frequency inverter DC welder has the following characteristics compared with the conventional AC welder.
(1) The welding quality is good. The current response time of the intermediate frequency welding is lms, and the adjustment accuracy and monitoring accuracy are greatly improved. Therefore, the welding quality is greatly improved. High control accuracy.
(2) The welding speed is high. The inverter resistance spot welding machine is a DC output, and the heating is concentrated, and the welding time is shortened.
(3) The energy saving effect is obvious. The inverter welding machine transformer works at a higher frequency, the loss is small, the DC output improves the power factor, and the energy saving effect is obvious.
(4) Equipment volume and quality. Inverter DC resistance spot welder transformer is greatly reduced, and the equipment is lighter.
(5) It is possible to spot weld dissimilar metals.
(6) Energy saving and environmental protection. Medium frequency welding is a three-phase balanced load, which has a much smaller impact on the grid than single-phase AC welding, reducing the requirements of the power supply system and complying with the national energy policy.
The foreign automobile industry has already integrated automatic welding technology with medium frequency spot welding technology. In the automobile factories of the United States and Japan, the medium frequency spot welding robot body welding line has been built. General Motors has built a car body welding line consisting of 750 medium frequency spot welding robots. At the same time, the United States Express Power Company concluded that the medium frequency spot welding is more efficient than AC spot welding. 27%.
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