Help, is there a crack in this weld?
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As shown in the image, a distinct mark can be seen at the arc-closing point, but it cannot be detected by PT. How exactly does it arise?
It doesn’t quite look like it. It can be polished with an angle grinder, followed by another penetrant test, allowing for a clear determination.
If there is no medium inside the pipe, RT radiographic testing is recommended for the butt weld! The fillet welds are colored with PT.
That’s not a crack; it’s caused by the welder’s action of ending the weld
It’s hard to be sure; it’s best to do a magnetic particle test or coloring test. If that’s not reliable, take X-rays. As a last resort, consider welding it again
It’s not a crack; at least the surface defects are not serious
It’s not a crack. If the surface finish is poor, it should be polished to ensure a smooth transition, after which necessary PT tests should be carried out in accordance with the design requirements