Year1
- 规格：
- 219-3500mm
- 规格：
- 6-28
Spiral steel pipe is a spiral seam steel pipe welded by automatic double-wire double-sided submerged arc welding process using strip coil plate as raw material
Extrusion molding at normal temperature
Mainly produced The process is as follows: (
) The raw material is steel strip coil welding wire flux. They must undergo strict physical and chemical inspections before being put into use. (
) Single-wire or double-wire submerged arc welding is used for the head-to-tail butt joint of the steel strip. After being rolled into a steel pipe, automatic submerged arc welding is used for repair welding. (
) Before forming, the strip steel is leveled, trimmed, planed, surface cleaned, transported and pre-bent. (
) Electric contact pressure gauges are used to control the pressure of the cylinders on both sides of the conveyor to ensure smooth conveying of the strip. (
) Adopt external control or internal control roller forming. (
) The weld gap control device is used to ensure that the weld gap meets the welding requirements. The pipe diameter offset and the weld gap are strictly controlled. (
) Both internal and external welding use American Lincoln electric welding machines for single-wire or double-wire submerged arc welding to obtain stable welding specifications. (
) All completed welds have been inspected by an online continuous ultrasonic automatic flaw detector to ensure %
non-destructive testing coverage of spiral welds. If there is a defect, it will automatically alarm and spray mark the production workers accordingly to adjust the process parameters at any time to eliminate the defect in time. (
) Use an air plasma cutting machine to cut the steel pipe into individual pieces. (
) After being cut into individual steel pipes, the first three steel pipes in each batch must undergo a strict first inspection system to check the mechanical properties and chemical composition of the welds, the surface quality of the steel pipes, and the non-destructive inspection to ensure that the pipe making process is qualified. Officially put into production. (
) The areas with continuous sonic flaw detection marks on the welds will undergo manual ultrasonic and radiographic re-examination. If defects are found, they will be repaired and then undergo non-destructive inspection again until it is confirmed that the defects have been eliminated. (
) The butt welds of the strip steel and the pipes where the T-shaped joints intersect with the spiral welds are all inspected by radiography or radiographs. (
) Each steel pipe undergoes a hydrostatic test and adopts radial sealing. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Test parameters are automatically printed and recorded. (
) Mechanical processing of the pipe end allows the end face verticality, bevel angle and blunt edge to be accurately controlled. Welcome new and old customers to our factory to discuss business with Yu Xin
Looking forward to cooperating with you!
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