Consumables not tested in the PWHT condition
Consumables not tested in the PWHT condition
(OP)
When qualifying a WPS to ASME IX, for example using E7018-1 on P1 and giving the weld a PWHT for a cold service application. My understanding is that the classification E7018-1 will then be qualified to do this weld as per WPS with a PWHT. My problem is when purchasing new consumables to ASME II C (AWS 5.1-91), consumables is tested in the as welded condition by the manufacturer. We know that there will be a loss of mechanical properties during PWHT, thus consumables close to the minimum values might dip below during PWHT. What need to be done to prevent this? Extreme measures like asking the manufacture to test the electrodes in the PWHT’ed condition for both the minimum and maximum times and temperatures possible, for every lot produced, have been proposed. Is this necessary? How does the codes allow for this possibility?
Thank you
Thank you





RE: Consumables not tested in the PWHT condition
see QW-100.1,QW200.2(c),QW-404,QW-430
Did you qualify P-1,7018 with PWHT? If so,all 7018 qualifies. Check your varibles in SecIX. Check the construction code. There may be other eng. concerns-but not code reqs.
RE: Consumables not tested in the PWHT condition
RE: Consumables not tested in the PWHT condition
The PWHT affects the base metal mechanical properties more so than the weld deposit mechanical properties for E7018. As such, the real concern regarding PWHT is a loss in base metal strength or toughness as a result of PWHT. The weld metal will have higher strength than the base metal after PWHT. Toughness of the weld metal is a separate issue.
RE: Consumables not tested in the PWHT condition