when we aplly post weld heat treatment ??????????????

By Leo Lee Date 06-06-2018 10:12

Hi all,
our client request our shipyards aplly PWHT for EH36 thickness > 15 mm as below follow AWS D1.1 .
base material yield strength (Y.S) is higher than 345Mpa & thickness > 15mm so PWHT is required as per Rules.
on WPS not mention aplly PWHT.

How can i explain for him
Thank

By 803056

Date 06-07-2018 04:22

Is the customer specifying AWS D1.1 for ship construction? If they are requiring AWS D1.1, are you using prequalified WPSs or are your WPSs qualified by testing, i.e., tensile testing, bend testing, etc.?

If you are using prequalified WPSs, follow clause 5 regarding post weld heat treatment and revised the existing WPS to include the PWHT to be used.

If the WPS is qualified by testing, a new WPS will have to be qualified using the PWHT required.

Good luck - Al