A simplified version of that table is given below įrom the above table we can conclude that The table which we have to refer to for this is QW 452.3. If a welder deposits weld metal of thickness 13 mm or more (with a minimum of three layers) then he/she qualifies for an unlimited thickness, but the maximum thickness which the welder can weld shall not be more than that specified in the WPS range.įor the range of outside diameter of pipes (Groove weld) for which a welder can weld is also provided in ASME BPVC Section IX.There are no criteria for minimum thickness.The maximum thickness which a welder can weld is 2T, where T is the thickness of the deposited weld metal on the test coupon by that welder.A simplified version of that table is given below Īccording to this table, three important points can be drawn: This can be found in Table – QW 452.1(b) of ASME BPVC Section IX. Thickness range for performance qualification (welder qualification test):ĪSME BPVC Section IX has provided guidelines for the thickness range up to which a welder can weld.
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