Article
301L stainless steel is mainly used for tram frame steel. It is an austenitic stainless steel with low Cr and Ni content and high N content, which reduces the carbon content of the original 301 steel to improve the intergranular corrosion resistance of the welding zone. The N element in it can compensate for the reduction in strength caused by the reduction in carbon content. It is used in trams to achieve light weight and reduce costs.
Austenitic stainless steel is the main type of stainless steel, with production and usage accounting for about 70% of the total. Compared with ordinary steel types, it has excellent high-temperature strength, fatigue strength and corrosion resistance, so it is widely used.
Austenitic stainless steel is mainly usedResistance spot welding machineIt is used for welding, but it has high resistance and generates a lot of heat but poor heat dissipation. During welding, the heat affected zone is easy to form coarse structures, so we must pay attention to the key points. 1. By welding with an AC pneumatic spot welder, a joint with the same strength as the base material can be obtained. Since its resistivity is larger than that of low carbon steel and its thermal conductivity is smaller than that of low carbon steel, it is advisable to use parameters with high current and short time. The welding time can be 40% to 50% shorter than that of low carbon steel plates of the same thickness. 2. Because the linear expansion coefficient of austenitic stainless steel is about 50% greater than that of carbon steel, it is easy to deform. Work equipment should be used to strengthen positioning. At the same time, a smaller nugget diameter should be used. It is generally recommended that it be no more than 4 times the plate thickness. If the strength still cannot meet the requirements, the number of welding points can be increased. 3. When spot welding austenitic stainless steel with a plate thickness greater than 3 mm, the multi-pulse current method of a medium-frequency spot welder should be used for welding.
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