No, you cannot use the WPS with impact test conducted at -20 deg cent for a service temp of -30 deg cent, impact test must be conducted at minimum design temperature and you need to even check whether any temperature correction had been consderedwhen testing was done at -20 deg cent and also the thickness of material tested. In case the welding is to be done on piping you may check ASME B 31.3 Conditions for mpact testing of the materials.
If the mpact test had been conducted at -30 deg cent then you could have used it for -20 deg cent, if all other parameters meet the requirements.
J.N.Murthy
On Tue, Jan 5, 2010 at 7:57 AM, Elshan Feyzullayev <elshan_f@hotmail.com> wrote:
Dear Friends,--
I have a welding to do on the material where the service temperature is -30 degree C. I have got a welding procedure which charpy V test was carried out at -20 degree C. can I use this procedure for welding of the material which the service temperature is -30 degree C?
regards,
Elilk.
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