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What does Christie's welder e-7 mean?

It is a model of electronic welding equipment. Jiashi welder E-7 is a model of electronic welding equipment, which is produced by China Jiashi Technology Co., Ltd. E-7 series welder is a digital intelligent MMA manual arc welding equipment, which is mainly used for welding stainless steel, aluminum alloy, copper alloy and other materials, and has the characteristics of good electromagnetic compatibility, high stability and good welding effect.