Abstract: Control means for a welder of the "tungsten-inert-gas" type which senses even momentary engagement of the workpiece by the torch to initiate gas flow. The welding region is initially purged by the gas. After a predetermined timed interval the output of the welding power source is elevated to a level sufficient to cause the striking of an arc.Gas flow is maintained during the welding operation and for a predetermined time interval after extinction of the arc is detected.Means are also provided for visually indicating gas flow and further for automatically preventing the striking of an arc when gas flow is exhausted.Means are provided so that the welder power supply may also be turned on automatically to eliminate the need for foot or hand-operated switches conventionally used to turn on the welder power supply.Sensing means are also provided to protect the torch from becoming accidentally "welded" to the workpiece.