During spot welding, the pressure exerted on the weldment through the electrode is called electrode pressure. The electrode pressure should be selected appropriately. When the pressure is high, the possible shrinkage porosity and shrinkage cavity during nugget solidification can be eliminated. However, the reduction of bonding resistance and current density will lead to insufficient heating of weldments, reduction of nugget diameter and strength of solder joints.
The electrode pressure can be selected according to the following factors: (1) the material of the weldment. The higher the high temperature strength of the material, the greater the electrode pressure required. Therefore, when welding stainless steel and heat-resistant steel, electrode pressure greater than that of welding low carbon steel shall be selected. (2) Welding parameters. The harder the welding specification, the greater the electrode pressure.
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