Laser Welding for repair

[SimoBrown]

Hello,

I'm coordinating a vendor that have to repair one of our pumps.
They have to repair the division planes of an axially split centrifugal pump, where the erosion due to the process fluid removed some material.
The scope of the repair is to add material in the damaged areas (they have to add just at maximum 2mm of thickness).
They want to use laser welding by a sub vendor that have WPS/PQR for laser cladding. This means that in the PQR no tensile tests are present bun only LP, bending test, hardness test.
Our welding engineer says that this WPS/PQR can't be used for repair because doesnt have tensile stress (as minimum requirement by ASME IX, with the bending stress too).
Our vendor says that it can be used because the body is not a pressurized body, and the areas damaged are in zones not stressed.

My question is:

Can they use this kind of WPS/PQR?

tks

 

[viper3982]

Your welding engineer is telling you no. Sounds like you already have your answer.

 

[weldstan]

If you were using a different alloy to provide greater erosion/corrosion resistance ( A-4 analysis over P-1 base material for example), it could be considered a corrosion resistant overlay and qualified as such under ASME IX. If the filler metal is the same alloy (A-1 analysis on P-1 base for example), it is weld buildup to restore the material and the procedure must be qualified with tensile and bend tests.