How to Conduct Non-destructive Testing for Straight Seam Steel Pipes?

After removing the root of the weld, double-sided weldments should be inspected. When using the oxyacetylene flame to cut the welding fixture on the alloy pipe that has a tendency to harden, defects in the ground part will be found. Radiographic testing and ultrasonic testing The main targets of radiographic testing and ultrasonic testing are the butt joints of straight seam steel pipes and the butt joints of butt welded pipe fittings.

 
The basis for selecting the non-destructive testing method of the straight seam steel pipe is the rule of the planning document. For welded joints of titanium, aluminum and aluminum alloys, copper and copper alloys, nickel and nickel alloys, radiographic testing methods should be used. For welds that are prone to cracks, radiographic and ultrasonic inspections should be performed after a certain period of time after the welds have cooled.
 
When the main pipe in the casing has a circumferential seam weld, the weld should be 100% radiographically inspected, and the masking operation can be carried out after passing the pressure test. The welded joints on the pipeline covered by the reinforcement ring or the support pad should be 100% radiographically inspected, and can be covered again after being qualified.
 

For welds inspected by the welding center in accordance with regulations, non-destructive testing shall be carried out after passing the visual inspection. Radiographic and ultrasonic testing should be carried out after the appearance of non-destructive testing, and the welds to be inspected can be welded only after they are qualified.

Tips: Straight seam steel pipe is a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. Straight seam steel pipes can be divided into high-frequency straight seam steel pipes (ERW Pipe) and submerged arc welded straight seam steel pipes (LSAW pipe) according to the production process. Straight seam welded pipe has simple production process, high production efficiency, low cost and rapid development.