AC arc welding electricity economizer

This invention is a contactless electricity economizer for welding machine. Its main technical features are that it uses an electronic logic circuit and a delay circuit to control the power supply for the welding machine and to automatically regulate the magnitude of working current (during welding) as well as to identify the working state whether the non-working short circuit state of the welding machine in accordance with the time of each welding. The former can greatly save electricity and welding electrode, and the latter can effectively prevent the welding machine from damage under its non-working short circuit state.