What are the common electrode materials for spot welders

Update:25 Aug 2020

What are the common electrode materials for spot welder […]

What are the common electrode materials for spot welders?

Class 1 copper and copper alloys with high conductivity and medium hardness. This type of material mainly achieves its hardness requirements through cold work deformation methods. It is suitable for making electrodes for welding aluminum and aluminum alloys, and also for spot welding of coated steel plates, but its performance is not as good as that of Type 2 alloys. Type 1 alloys are also commonly used to make non-stressed or low-stress conductive parts.

Type 2 has higher conductivity and higher hardness than Type 1 alloys. This type of alloy can achieve its performance requirements through the combination of 236 cold work deformation and heat treatment. Compared with Class 1 alloys, it has higher mechanical properties, moderate electrical conductivity, and strong resistance to deformation under moderate pressure. Therefore, it is the most versatile electrode material and is widely used for spot welding. Carbon steel, low-alloy steel, stainless steel, high-temperature alloy, copper alloy with low electrical conductivity, and coated steel. Type 2 alloys are also suitable for the manufacture of various conductive components in resistance welding machines such as shafts, clamps, platens, electrode chucks, and machine guesses.  

Type 3 alloys with conductivity lower than Type 1 and Type 2, and hardness higher than Type 2. This type of combination can achieve its performance requirements through heat treatment or a combination of cold work deformation and heat treatment. This type of alloy has higher mechanical properties and good wear resistance, high softening temperature, but low conductivity per ton. Therefore, it is suitable for spot welding resistivity and high temperature and high strength materials. There are five types of standard power supplies (ie, straight electrodes). The end face of the electrode is in direct contact with the surface of the high-temperature workpiece, and is repeatedly subjected to high temperature and high pressure during welding production. Therefore, adhesion, alloying and deformation are issues that should be emphasized in electrode design.

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