Among numerous structural steel pipes, there is a type of steel pipe with a diameter of up to 3 meters. Do you know what type of steel pipe it is? Perhaps many people have guessed that it is our spiral welded steel pipe. Also known as spiral steel pipes.

(1)Raw materials include steel coils, welding wires, and flux Strict physical and chemical testing must be conducted before investment

(2)The button joint of the strip steel head and tail is carried out using single or double wire submerged arc welding, and automatic submerged arc welding repair welding is used after rolling into steel pipes

(3)Before forming, the strip steel undergoes level, edge cutting, edge planning, surface cleaning, transportation, and pre bonding treatment

(4)The use of an electric contact pressure gauge to control the pressure of the hydraulic cylinders on both sides of the conveyor covers the smooth transportation of the strip steel

(5)Adopting external or internal control controller formatting

(6)The use of a weld gap control device guarantees that the weld gap meets welding requirements, and the pipe diameter, misalignment, and weld gap are strictly controlled

(7)Both internal and external welding are carried out using Lincoln electric welding machines from the United States for single or double wire submitted arc welding, in order to achieve stable welding quality

(9)Use an air plasma cutting machine to cut steel pipes into individual pieces

(10)After cutting into a single steel pipe, each batch of steel pipes must undergo a strict first inspection system to check the mechanical properties, chemical composition, fusion status of the weld seam, surface quality of the steel pipe, and non-destructive testing to ensure that the pipe manufacturing process is qualified before it can be officially put into production

(11)The parts with continuous sound wave inspection marks on the weld seam underground manual ultrasonic and X-ray re examination If there are internal defects, they are repaired and under construction non destructive testing still until it is confirmed that the defects have been identified

(12)The pipes where the button weld seam of the strip steel and the T-joint intersection with the spiral weld seam are all inspected by X-ray television or photography

(13)Each steel pipe undergoes a hydrostatic test, and the pressure is sealed radially The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device Test parameters are automatically printed and recorded

(14)Mechanical processing of the pipe end guarantees accurate control of the permeability, groove angle, and blind edges of the end face