Universal welding set for alternating or direct current - suitable for plasma-arc or tungsten-inert gas welding

摘要

A power-supply unit with transformer and rectifier, plus controls for the current, inert-gas and coolant, has switches used to isolate the D.C. supply and switch in a second, continuously-adjustable, A.C. transformer which is pref. housed in a separate box. The advantage is that a D.C. welding set can be rapidly converted for use with a.C. by means of simple switches and the typa of A.C. transformer readily available in most workshops, so that the inert-gas and coolant controls on the D.C. set can be used in A.C. welding.