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exceed to range of WPS???

exceed to range of WPS???

exceed to range of WPS???

(OP)
dear all,
i have approved WPS for groove of Carbon Steel comply with ASME IX code ( max. 11mm thickness). so now can i weld with double bevel with 18 mm of thickness? because of with single bevel joint i can weld two side and with each side i have imagined as single bevel of 9mm thickness. (mid of 18mm is 9mm). please correct my thinking  

RE: exceed to range of WPS???

No. You will need to qualify a new procedure on material at least 9 mm thick to permit welding 18 mm thick material. Joint design is a non essential variable while base metal thickness is an essential variable.   

RE: exceed to range of WPS???

Also, think about using a 38mm [1.5"] thick coupon.  This will give you an Unlimited Thickness procedure.  The extra time and cost of the additional thickness will be fairly small.  And it is a capital expense; PQR's last longer than the building your company is headquartered in.  PQR's and WPS's last forever.

RE: exceed to range of WPS???

Dewe6 is correct about using a 1.5" weld test coupon, unless the material is impact tested. In that case you can run into a problem with the minimum base metal thickness. You would be restricted to 16mm minimum.

Bob

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