... arc for stainless steel, IGBT DC MMA Welding Equipment ZX7 The features of IGBT DC MMA Welding Equipment ZX7-400 are as ... , over-current protection, under-voltage protection, suitable for TIG and MMA of various metals;4. Stable arc, high welder speed, little ... : welding holder, earth clamp, ect.The parameters of IGBT DC MMA Welding Equipment ZX7-400 are as following: ModelSpec.ZX7-400Power ...