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Some knowledge of SSAW spiral welded steel pipe
- May 10, 2018 -

Some industry knowledge standard of SSAW spiralwelded steel pipe

The raw material of spiral welded steel pipe is strip coil, wire, flux.

1. Before production must undergo a rigorous physical and chemical testing.

2. Steel head and tail butt welding,the use of single or double wire submerged arc welding, in the coil after the use of automatic submerged arc welding repair welding.

3. Before the type, the steel strip passes the leveling, the trimming, the planing edge, the surface cleans up transports and bends the edge processing.

4. Weld clearance control device to ensure weld clearance to meet welding requirements, pipe diameter, error margin and weld clearance are strictly controlled. 

5. A single pipe, each batch of steel pipe first three to carry out a strict first inspection system, check the mechanical properties of the weld, chemical composition, the status of fusion, steel pipe surface quality and through nondestructive testing, to ensure that the pipe process qualified to be formally put into production.

6. On the part of the continuous sonic flaw detection mark, after manual ultrasound and X-ray review, if there is a defect, after repair, again through non-destructive testing, until the identification of the defect has been eliminated.

7 Mechanical processing, so that the end of the vertical, slope and blunt edge of the angle is accurately controlled.