- Circular seam welding equipment for tank and pipe - TIG, MAG, MIG, ... Linear guide rail design This machine is designed for round seam welding of round work piece. Such as transmission shaft, axle ... , cooper, alumnium, zinc coating plate by using different welding sources. Such as TIG welder, MIG/MAG welder, plasma ... Work piece support.Picture 5. Cooper earth connection. Circular seam welding equipment