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.