Straight welded pipe is a kind of steel plate or steel strip after pretreatment, crimping, welding and other processes made of pipe, its characteristics are welded joints in a straight line. Straight welded pipe is widely used in petroleum, natural gas, chemical, electric power, construction and other fields, often used to transport fluid, gas or solid powder and other materials. Because of the relatively low production cost, straight welded pipe is a common industrial pipe.