Compared to copper alloys and aluminum alloy, the resistivity slightly higher and slightly lower thermal conductivity, so the spot is not too difficult. Thickness less than 1.5mm of copper alloys, especially low-conductivity copper alloy used in the production of the most extensive. High conductivity copper, spot welding more difficult.

Usually increases in the shim between the electrode and the workpiece, or use the power of extreme head embedded in the tungsten composite electrode, in order to reduce the heat to the electrodes. Tungsten diameter is usually 3-4mm.

Welding of high conductivity copper and brass and bronze, they generally do with a class of electrode alloy electrode for welding low conductivity brass, bronze and copper-nickel alloy, the use of Class 2 welding electrodes alloy. Tungsten can also be embedded in welded copper welding electrode. The poor thermal conductivity of tungsten, it can use much smaller welding current, commonly used on medium-power welder spot welding, but the adhesion of tungsten electrode and the workpiece easily affect the appearance of the workpiece. The following two tables for the spot welding conditions brass.