2, spiral welded steel pipe refers to the use of steel or steel bending deformation is circular, high-frequency welded pipe equipment such as a square shape and then welded to the surface of the steel pipe joints. According to the welding method can be divided into arc welding tube, high frequency or low-frequency resistance welded pipe, gas welded pipe, furnace welded pipe, Bondi pipe. According to The Shape of the Weld can be divided into straight seam welded pipe and spiral welded pipe.
Electric welded steel pipe is used in oil drilling and machinery manufacturing industries, etc. Furnace pipe can be used as water gas pipe, large diameter straight seam welding pipe for high-pressure oil and gas transportation; spiral welding pipe for oil and gas transportation, pipe piles, piers and so on. High-frequency welded steel pipe welding equipment is lower than the cost of a seamless steel pipe, high production efficiency.