- Circular seam weld for tank - TIG, MAG, MIG, plasma, laser avaiable - Linear guide rail design This machine is designed for round seam welding of round work piece. Such as transmission shaft, axle, hydraulic ram, solar water heater, electric water heater, pressure container, gas tank and so on. Work piece is rotated by motor and belt. Welding torch's horizental moving is adjusted by manual, ...