Straight seam welding machine is a kind of through automation, mechanization of implementation of Straight seam welding completion of automatic welding equipment. Straight seam welding machine is also called straight seam automatic welding machine, automatic longitudinal seam welder, is a kind of automatic welding machine. Can be a lot of to replace artificial, greatly improve production efficiency and welding quality, reduce labor cost, improve the welding workers work environment. The shell Angle seam welding, such as large transformer straight seam welding of large cylinder, solar water heater cylinder straight seam welding, production line of steel belt joint with straight seam welding, h-beam welding etc., are a large number of the straight seam welding machine.