Regarding the issue of taking X-rays after welding plant valves
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Most valves used in power plants are welded. We previously supplied a batch of valves to a customer; during on-site welding, the inspections failed. Upon inspection, it was found that the inner diameter of the customer’s pipes was 1.5 mm larger than the welding port of the valves. The welding port of those valves was then enlarged to resolve the issue. I would like to ask: for example, with a pipe of 18*4, what wall thickness would make it impossible to pass through during imaging?
This is basic; an bevel can be added for further processing
This is basic; an bevel can be added for further processing
This mainly refers to the inner hole area; there is a reason why no beveled holes are created in that area as well. The requirement for beveling the inner holes of the product is quite high, and this step was omitted in order to reduce costs.
This resulted in misalignment due to the difference in thickness, causing the image on the RT film to be unsatisfactory. . . The best approach is to grind it to equal thickness for welding. .
All companies have cost control. But to meet the requirements, one can’t take shortcuts. Our company uses minimal materials, so we had no choice but to process the thick 2\" SCH160 pipes directly into thin-walled 2\" SCH40 pipes
This mainly refers to the inner hole area; there is a reason why no beveled holes are created in that area as well. The requirement for beveling the inner holes of the product is quite high, and this step was omitted in order to reduce costs.
The difference in the inner diameters within the acceptance range should not exceed 0.5 mm, so there is no issue with taking X-rays. At least that’s what has been found so far; we haven’t tried larger sizes.