Abstract: This paper investigated on the implementation effect of point welding tooling on “π” pipe for the prisking equipment, visual macro testing and magnetic particle testing were carried out for the welding parts of the tooling, and found out that the macro inspection of “π” pipe welding scar site cannot detect the defect,but applying magnetic powder detection could find out the defect. The larger the “π”shaped pipe, the easier the weld scar cracks. It was recommended that the GB/T 20801. 4—2020 standard be modified to avoid objection during implementation. It was recommended to choose the non-spot welding auxiliary mechanical support tooling that does not damage the pipeline.