All the tees welded on site of Qinshan Nuclear Power Phase II 1MX project are equal diameter tees, and the pipe connection form is full penetration non-insertion fillet weld. The conventional radiographic inspection method is to use an external radiographic source for transillumination, and place the film inside the pipe connection. However, due to the small diameter of the branch and main pipes and the long pipes, the film cannot be placed inside the pipe connection. The author adopts the following method to better solve the radiographic inspection problem of this type of weld.
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