The spiral steel pipe is a spiral seam steel pipe with a steel coiled plate as a raw material, which is often formed by warm extrusion and urban pressure forming, and is welded by an automatic double-wire submerged arc welding process.

(1) The raw materials are strip coil, welding wire and flux. Before input, it must undergo strict physical and chemical tests.

(2) The head and tail of the strip steel are connected by single-wire or double-wire submerged arc welding, and after being rolled into steel pipes, automatic submerged arc welding is used for repair welding.

(3) Before forming, the strip steel is leveled, trimmed, planed, surface cleaned and transported, and pre-bent.

(4) The electric contact pressure gauge is used to control the pressure of the oil cylinder on both sides of the conveyor to ensure the smooth transportation of the steel strip.

(5) Using external control or internal control roll forming. Hebei spiral steel pipe / spiral steel pipe factory / spiral steel pipe price

(6) Weld seam gap control device is used to ensure that the weld seam gap meets the welding requirements, and the pipe diameter, the amount of misalignment and the weld seam gap are all strictly controlled.

(7) Both internal and external welding are performed by American Lincoln electric welding machine for single-wire or double-wire submerged arc welding, so as to obtain stable welding specifications.

(8) All welded seams are inspected by online continuous ultrasonic automatic flaw detector, which guarantees 100% coverage of non-destructive testing of spiral welds. If there are defects, it will automatically alarm and spray marks, and the production workers will adjust the process parameters at any time according to this, and eliminate the defects in time.

(9) Use air plasma cutting machine to cut the steel pipe into single 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 state, surface quality of the steel pipe and non-destructive inspection to ensure that the pipe making process is qualified Only then can it be officially put into production.

(11) The parts with continuous sonic flaw detection marks on the welding seam are reviewed by manual ultrasonic and X-ray. If there are any defects, after repairing, they will undergo non-destructive inspection again until it is confirmed that the defects have been eliminated.