When there are too many defects in the welded joints of Q345 seamless steel pipes, welding repairs can be used for repairing. Note that the number of times of welding and repairing alloy steel at the same position is not more than 2 times, and the following regulations must be met:
1. Defects must be completely eliminated;
2. When welding Q345 seamless steel pipes, corresponding measures need to be formulated and approved in strict accordance with the requirements of the repair process;
3. Re-appearance inspection and spectral analysis are required after rework;
4. Then heat-treat the joints of Q345 seamless steel pipes;
5. The repair service should carry out the necessary hardness test after the heat treatment of the Q345 seamless steel pipe;
6. After heat treatment, the reworked joint must be consistent with the original process flaw detection again.