Merkle OptiMIG 350 KW from built in 2009. OptiMIG The 350KW is a strong water-cooled welding plant, which mainly can be used with high welding current values at Stahlbaürn and industrial companies. The compact, rugged design and ease of use, this system is very much appreciated. 28-stage switch with automatic wire and 4-roll feed burner Cooling: Water Welding current: 25-350A Duty cycle 60% (10min.) 40 C DB 350A 100% duty 300A 40 C Weight: 190kg