Class D welds cannot pass ultrasonic testing. How should we weld in this case?
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I built a piece of equipment with a cylinder thickness of DN600X18 and a nozzle of 355.6X20, as shown in the picture, but the fillet weld failed to pass the ultrasonic test. Can anyone please tell me how this weld passed the ultrasonic test and passed the I level?
The drawings I have seen are for cylinders with a diameter of DN800 and above, and ultrasound is required only for pipes with a diameter of DN200 and above.
Ultrasound cannot detect many parts. If internal testing is necessary, then do radiography.
This requires a very high level of professionalism and technology. And there is no requirement that Class D welds must undergo ultrasonic testing. Generally, it is the surface.