- Circular seam welder for tank and pipe - TIG, MAG, MIG, plasma, ... seam welding of round work piece. Such as transmission shaft, axle, hydraulic ram, solar water heater, electric water heater, pressure container ... different welding sources. Such as TIG welder, MIG/MAG welder, plasma welder, laser welder and so on. Water cooling for ... support.Picture 5. Cooper earth connection. Circular seam welder