DIN EN ISO 669:2016-07

This document applies to resistance welding equipment, to guns with integrated 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 Standard does not apply to welding transformers separate from the equipment. Electrical safety requirements for resistance welding equipment are covered by IEC 62135-1.