Dear All
NACE TM0284:2011 document describes HIC testing and sampling of specimen in various product forms, from plates to welded pipes [...]
With regards to welded product forms, the NACE document TM0284:2011 systematically asks for sampling into the welded zone and in the heat affected zone, in addition to specimen sampled in base metal. Once the HIC test is completed and results are within acceptable range, the raw welded material (for example a batch of welded pipes) is qualified as "HIC resistant".
Because NACE TM0284:2011 systematically asks for sampling into the welded zone and in the heat affected zone, I conclude that the welding at mill factory can increase susceptibility of the material to HIC damage.
HIC resistant materials are to be exposed in wet H2S service, thus the welding achieved on site during construction has to respect internationnally recognized documents applicable to controlling SSC damage, for example NACE MR0103 document.
My question is :
Is it necessary to qualify on site welding procedures of HIC resistant raw materials with respect to their resistance to HIC damage by performing HIC test of the weld and HAZ of production weld coupons ?
Or having HIC resistant materials (qualified by HIC testing at mill before construction) welded with application of NACE MR0103 renders the welded HIC resistant raw materials construction HIC resistant ?
thank in advance for your advice
NACE TM0284:2011 document describes HIC testing and sampling of specimen in various product forms, from plates to welded pipes [...]
With regards to welded product forms, the NACE document TM0284:2011 systematically asks for sampling into the welded zone and in the heat affected zone, in addition to specimen sampled in base metal. Once the HIC test is completed and results are within acceptable range, the raw welded material (for example a batch of welded pipes) is qualified as "HIC resistant".
Because NACE TM0284:2011 systematically asks for sampling into the welded zone and in the heat affected zone, I conclude that the welding at mill factory can increase susceptibility of the material to HIC damage.
HIC resistant materials are to be exposed in wet H2S service, thus the welding achieved on site during construction has to respect internationnally recognized documents applicable to controlling SSC damage, for example NACE MR0103 document.
My question is :
Is it necessary to qualify on site welding procedures of HIC resistant raw materials with respect to their resistance to HIC damage by performing HIC test of the weld and HAZ of production weld coupons ?
Or having HIC resistant materials (qualified by HIC testing at mill before construction) welded with application of NACE MR0103 renders the welded HIC resistant raw materials construction HIC resistant ?
thank in advance for your advice