在群众性的技术革新和技术改造运动中,许多单位经过反复实践、革新,研制了多种类型的电焊机自动开关。电焊机曾被称为“电老虎”,加装自动开关后,可节约大量电能。例如一台21千伏安的交流焊机,如按焊接时间占百分之五十计算,每班可节约电10～12度。电焊机自动开关也是焊接自动化设备的一个组成部分。在进行程序控制焊接时,用 In the mass of technological innovation and technological transformation movement, many units through repeated practice, innovation, developed a variety of automatic welding switch. Electric welding machine has been called “electric tiger”, the installation of automatic switch, you can save a lot of power. For example, a 21 KVA AC welding machine, such as welding time accounted for 50 percent of the calculation, each class can save electricity 10 ~ 12 degrees. Automatic welding welder is also an integral part of welding automation equipment. Used in process control welding