Pl. refer QW 403.6 for "T" limits impact for base metals which states that:
"the min. base metal thickness qualified is the thickness of the test coupon T or 16mm,whichever is less.However where T is less than 6mm the min. thickness qualified is 0.5T..
Regards
Prem Nautiyal
On Mon, 12 Oct 2009 20:52:00 +0530 wrote
>Prem,You need impact test...? Why? The question can be answered as it is, see below yours. It is a generic question. But still, I think a WPS is qualified to weld all if within its parameters. Imposition is on weld metal deposits (>12.5 mm per pass). WQT will decide what sizes a welder can weld.SV--- On Sun, 11/10/09, PREM SHANKARDUTT NAUTIYAL
What i interpret from the query is that the thickness of test coupon welded for PQR i.e while qualifying the WPS was 15mm.
Hence as per ASME SecIX, QW-451:which states the Procedure qualification thickness limits, the range of thickness "T" of base metal qualified will be 5mm to 30mm (2T).
Actually the question is not very clear and imp. details like impact requirements are missing ...
All are requested to pose clear,detailed to the point queries so that they can get correct answers / solutions.
Regards
Prem Nautiyal
Cell:9820313278
On Sun, 11 Oct 2009 14:06:21 +0530 wrote
>thickness limits are defined in QW 403.6 and 403.8,diameteris not a restriction for procedure but thickness limits are.to weld 20mm thickness your PQR test coupon thickness shall beat least10mm
On Sun, Oct 11, 2009 at 10:53 AM, Shashank Vagal wrote:
Hi Group Members,Please see the following and advise.Shashank Vagal
Query:
dear every one,
i have this problem i need to know the thickness range or pipes diameter
range for the wps in which standard i think its in asme sec 9 but where ???
for exmple if i have wps for thickness 15 is it cover the 20 mm
waiting answer please
regards
My Reply:
A WPS is a guideline to ensure joint integrity as proven by
PQR + applicable mech tests + NDT. It is intended for all job sizes once the
welding technique used proves itself in these tests. The sizes etc come in to
picture by qualifying welder on test coupons of a given size as per your job
requirements. ASME IX stipulates weld metal deposit and not job size. Please
ref to QW 450 - 461.
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