Patent ID: 6423937
Filing Date: 2002-07-23
Classification: B23K

Abstract:
A manual TIG welding apparatus, comprising;a welding torch; a source of inert welding gas to provide inert gas to said welding torch and a work piece; an operating device to provide electric current to operate said welding torch; current set value circuitry to set welding current in said welding torch; a control arrangement to control said operating device; said control arrangement comprising circuitry to change current in said welding torch between at least a first and a second level of current in which the first level of current corresponds to a minimum current to reliably establish an arc between said welding torch and a workpiece, and the second level of current corresponds to a welding current to weld a workpiece; an operator actuatable control to provide a signal to set current provided by said operating device to said welding torch to the first current level and the second current level.