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This International Standard applies to resistance welding equipment, to guns with inbuilt transformers and to complete movable welding equipment.

The following types are included:

• single-phase equipment with alternating welding current;
• single-phase equipment with rectified welding current by rectification of the output of the welding transformer;
• single-phase equipment with inverter welding transformer;
• three-phase equipment with rectified welding current by rectification of the output of the welding transformer;
• three-phase equipment with a current rectification in the input of the welding transformer (sometimes called frequency convertor);
• three-phase equipment with inverter welding transformers.

This International Standard applies neither to welding transformers sold separately nor to safety requirements.