Electroweld Industries manufactures Heavy Duty Upset Butt Welding Machines. Electroweld Industries offers various types of welding machines. The Heavy Duty Upset Butt Welding Machines are suitable to weld: M.S.: 4 - 25 mm diameter H.C.: 4 - 13 mm Copper: 4 - 12 mm Aluminium: 5 - 20 mm Brass: 5 - 20 mm