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[MW:13520] Modification of the flange joint welding

Guys,
I have an issue. Half of the pipe grit welds ground up to capping due to misalignment problem between pump flanges with pipe flange. Now the issue is our client is not accepting this type of modification. Client says that if you are re-welding (removal of capping up to half of the portion) and re-weld, the joint get more stress.
Note: Re-welding carried out after losing the stud from the pump flange.
Replied to client that we did the modification like repairing the joint. He is not convinced.
Can anyone advise me how I can satisfy my client with reference with code?
Which code is saying the up to what extend you can remove the weld?
You valuable advice will be expecting soon.
Thanks and regards
Pramodh
 

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