Hi
Macro examination is mostly carried out at 5X to 10X magnification to assess the internal weld quality.
The magnification will depend upon your client specs. / applicable code.
If your PQR is as per ASME Sec.IX, then please refer following clause:
QW-453, Note 8.
QW-453: PROCEDURE/PERFORMANCE QUALIFICATION THICKNESS LIMITS AND TEST
SPECIMENS FOR HARD-FACING (WEAR-RESISTANT) AND CORROSIONRESISTANT
OVERLAYS
Notes(8): The base metal shall be sectioned transversely to the direction of the hard-facing overlay. The two faces of the hard-facing exposed by sectioning shall be polished and etched with a suitable etchant and shall be visually examined with ×5 magnification for cracks in the base metal or the heat affected zone, lack of fusion, or other linear defects.
Regards
Prem Nautiyal
On Wed, 10 Nov 2010 14:23:36 +0530 wrote
>Dear members,
I've a question about Macro examination in
PQR's. What is the minimum magnifcation level we need to have? ,is
there any reference standard/specification .
One of my client spec syas it must be x5 .I have come across with
various PQR review this magnification level is varying a range from
x2.7 ,x3.4,x4.0&x5.0.
Also is there any significance in referring the letter in small
case(x5) or Caps(X5)
Any one can put your expertise in this regard.
pavainathan
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PREM S NAUTIYAL
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