Please state, if there are subtle differences, with respect to referencing between QW-451.1 and QW-451.2.
Regards.
PROCEDURE QUALIFICATIONS QW-253 QW-253 WELDING VARIABLES PROCEDURE ...File Format: PDF/Adobe Acrobat - View as HTMLQW-451.1 or QW-451.2, as applicable. QW-403.11 Base metals specified in the WPS ...... instance, differences in the level of preheat between the classi- ...
canteach.candu.org/library/20053414.pdf - Similar -
You'll have to look for it.