Re: [MW:24663] High YS to Low YS

dear Munden

please refer trailing para extracted from ASME section IX. I hope this may help you

QW-200.3 To reduce the number of welding procedure
qualifications required, P‐Numbers are assigned to
base metals dependent on characteristics such as composition,
weldability, and mechanical properties, where this
can logically be done; and for steel and steel alloys
(Table QW/QB-422) Group Numbers are assigned additionally
to P‐Numbers. These Group Numbers classify
the metals within P‐Numbers for the purpose of procedure
qualification where notch‐toughness requirements are
specified. The assignments do not imply that base metals
may be indiscriminately substituted for a base metal
which was used in the qualification test without
consideration of the compatibility from the standpoint of
metallurgical properties, postweld heat treatment, design,
mechanical properties, and service requirements. Where
notch toughness is a consideration, it is presupposed that
the base metals meet the specific requirements.

Regards,

Vivek Pandey

QC Engineer

On Sun, Apr 10, 2016 at 9:12 AM, meisam shokri arfaei <meisamshokri@gmail.com> wrote:

The YS is not a concern by its own.

You have to refer to the reference standard/code and check the material grouping system and essential variables which may cause re-qualification.

Regards

On Sat, Apr 9, 2016 at 6:13 PM, mubeenaws <mubeenaws@gmail.com> wrote:

Good day all 

Please help me out by providing u r advise on below request. 

We have a qualified WPS with 75K YS material as per Sec-IX, can we use on material with 65K YS for welding? 

Please provide your feed back with reference clause. 

Thanks and Regards 

Munden

Sent from my Samsung device

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M. Shokri Arfaei

ASNT NDT Level III

International Welding Engineer

Mob.:+98 912 1394023

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