Straight seam welder (50-100-150) This equipment is mainly used for the straight and circular welding of inner& outer of solar water heater, meantime it has function of spot welding and is kind of mult-function water tank welder. It can weld carbon steel, stainless steel, galvanized materials with fast speed and high precision and no destroy. The welding effective length is 1800mm, power is 50-150kw, thickness is from 0.2 to1.2mm. The dimension of machine is 2.5x0.75x1.8M.