Please give guidance
There is a lot of confusion and different interpretations as to what exactly is a weld repair and what exactly is (an upgrade),
Especially when it comes to the Post Weld Heat Treatment.
I know what the ASTM says and it is generally 20% of wall thickness etc etc,
But this to me seem to be a very grey area and for someone with limited knowledge such as me it doesn`t really answer the question,
Lets for instance say that you have a casting wall that is 100mm thick that has a defect/porosity, you grind or machine that out 25mm to clear the defect, is that a repair?
Lets for instance use the same casting same dimensions this time a machinist makes an error and machines a 25mm hole in the wrong place
Is this an upgrade?
Next for surface area welds
A casting has severe defects on a face that requires lots of grinding and digging out of the face, it is then welded to replace the removed material and the surface area is 80sq in , is that a weld repair?
An exact casting has been checked and for whatever reason is short of material for machining, it is then welded to size, the material and the surface is calculated to be 80sq in , is this an upgrade??
To me it seems the ASTM can almost be read to suit , this doesn`t really give a definitive answer, I know that there are different materials that require PWHT but generally the materials that we use all have this section on the specs ,
Please give guidance
Regards
Dave j
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