Advantages and disadvantages of MIG welding machine

2024-01-23 21:41

2.jpg1. Advantages of MIG welding

(1) The welding quality is good due to the use of inert gas as a protective gas, which has a good protective effect, stable welding process, small deformation, and no spatter. When welding aluminum and aluminum alloys, DC reverse polarity can be used, which has good cathode crushing effect.

(2) High welding productivity is achieved by using welding wires as electrodes, which can be welded with high current density. The base metal has a deep melting depth and the welding wire melts quickly. When welding thick aluminum, copper, and their alloys, the productivity is higher than that of tungsten inert gas shielded welding. Compared with electrode arc welding, it can continuously feed wire, save material processing time, and the weld does not require slag cleaning, resulting in higher production efficiency.

(3) Widely applicable due to the use of inert gas as a protective gas, which does not react with the molten pool metal, the protective effect is good, and almost all metal materials can be welded, so the applicability is wide. However, due to the high production cost and high price of inert gas, currently melt inert gas shielded welding is mainly used for the welding of non-ferrous metals and their alloys, stainless steel and some alloy steels.

2. Disadvantages of MIG welding

MIG welding has no deoxygenation or dehydrogenation effect, so it is sensitive to oil and rust on the base material and welding wire, which can easily form defects. Therefore, the surface cleaning requirements for welding materials are particularly strict; In addition, the melting inert gas shielded welding has poor wind resistance and is not suitable for outdoor welding; Welding equipment is also relatively complex, consisting of welding power supply, wire feeding mechanism, welding gun, control system, water and gas supply system, and other parts.

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