here is what i read and would like to discuss. im mostly interested in the coupon i need, hardness specs and if the chem test is mandatory?
a PQR, As per ASME Sec IX , QW-453 following test are required for procedure qualification of hard face overlay
(3) The hard-facing surface shall be examined by the liquid penetrant method and shall meet the acceptance standards in QW-195.2 or as specified
in the WPS. Surface conditioning prior to liquid penetrant examination is permitted.
(7) After surface conditioning to the minimum thickness specified in the WPS, a minimum of three hardness readings shall be made on each of
the specimens from the locations shown in QW-462.5(b) or QW-462.5(e). All readings shall meet the requirements of the WPS.
(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. The overlay and the base metal shall meet the requirements specified in the WPS.
All exposed faces shall be examined. See QW-462.5(b) for pipe and QW-462.5(e) for plate.
(9) When a chemical composition is specified in the WPS, chemical analysis specimens shall be removed at locations specified in QW-462.5(b)
or QW-462.5(e).
The chemical analysis shall be performed in accordance with QW-462.5(a) and shall be within the range specified in the
WPS. This chemical analysis is not required when a chemical composition is not specified on the WPS.