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301L stainless steel is mainly used for tram frame steel. It is an austenitic stainless steel with lower Cr and Ni content and higher N content, which reduces the carbon content of the original 301 steel to improve the intergranular corrosion resistance of the welding zone.

In ventilation ducts, home appliances, automobiles, kitchen supplies, packaging tool boxes and other industries, in order to extend the service life of products and enhance the corrosion resistance of materials, coated steel plates are becoming more and more widely used. Resistance spot welding and projection welding of galvanized steel plates have low contact resistance. . .

As the Russia-Ukraine war continues and global oil prices continue to rise, lightweight new energy vehicles are becoming more and more popular. The quality of the vehicle determines fuel consumption. Lightweighting the vehicle body can significantly reduce the weight of the vehicle, and the fuel usage can be significantly reduced. If the car body needs to be lightweight, it must be made of aluminum alloy.

Everything has its own laws of operation. The editor of Xinxing recommends that welders understand the law of nugget changes in resistance spot welding and weld high-quality products.

1. The role of the pre-pressure stage is to reduce contact resistance, increase conductive cross-section, and increase physical contact points, creating conditions for the smooth passage of welding current in the future; in addition, under the action of pressure, the plastic deformation caused by the extrusion of metal into the gap helps to form a transparent sealing layer around the nugget to seal the nugget.

This is related to the performance and structure of low carbon steel. Its carbon content is low, below 0.2%. It has low strength, low hardness, good toughness and weldability, and a wide range of welding parameters. Generally, low carbon steel with a thickness of 0.5-3.5mm does not require special measures and can be simply welded with a single-phase power frequency AC power spot welder.

When welding with a resistance welder, the surface of the workpiece must be kept clean. If rust, oil stains and other contaminants are not cleaned, it will produce great resistance, resulting in defects such as incomplete welding and weak welding.

The solder joints during spot welding have clear requirements on some materials, such as size, penetration rate, etc. If there is deviation, it means it does not meet the standards. The editor of Xinxing has seen the solution using an upper and lower cylinder type spot welder. In fact, there are 5 solutions. Let’s take a look.