--Dear Mr. Shadab Alam Ansari,
I couldn't find any clause in ASME BPV SEC IX insisting that, one welder has to weld the entire circumference of pipe for welder performance qualification. It says "the volumetric NDE shall include the entire circumference of pipe(s)".As long as ASME BPV is silent on this and didn't mention a sentence like "a welder has to weld entire circumference of pipe", then on what basis a welding contractor is suppose to follow this?
As per ASME BPV SEC IX 2010 Edition,
QW-302.2 Volumetric NDE.
When the welder or welding operator is qualified by volumetric NDE, as permitted in QW-304 for welders and QW-305 for welding operators, the minimum length of coupon(s) to be examined shall be 6 in. (150 mm) and shall include the entire weld circumference for pipe(s), except that for small diameter pipe, multiple coupons may be required, but the number need not exceed four consecutively made test coupons. The examination technique and acceptance criteria shall be in accordance with QW-191.
QW-306 Combination of Welding Processes
Each welder or welding operator shall be qualified within the limits given in QW-301 for the specific welding process (es) he will be required to use in production welding. A welder or welding operator may be qualified by making tests with each individual welding process in separate test coupons, or with a combination of welding processes in a single test coupon. Two or more welders or welding operators, each using the same or a different welding process, may be qualified in combination in a single test coupon. For combination qualifications in a single test coupon, the limits for thicknesses of deposited weld metal, and bend and fillet testing are given in QW-452 and shall be considered individually for each welder or welding operator for each welding process or whenever there is a change in an essential variable. A welder or welding operator qualified in combination on a single test coupon is qualified to weld in production using any of his processes individually or in different combinations, provided he welds within his limits of qualification with each specific process. Failure of any portion of a combination test in a single test coupon constitutes failure of the entire combination.
Regards,
Limesh
On Thu, Dec 2, 2010 at 8:42 AM, Shadab Alam Ansari <ansari@ghi.com.sa> wrote:
--Dear Mr. Eduardo Calva,
Are you working as per ASME Sec-IX? If yes then it is not permitted to weld a complete circumference using different welders.
As per ASME Sec-IX, QW-302.2, the minimum weld length of coupons to be examined shall be 6 inch (150 mm) and shall include the entire weld circumference for pipe(s).
Best regards,
Shadab Alam Ansari
Welding Engineer
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Eduardo Calva
Sent: Thursday, December 02, 2010 5:39 AM
To: materials-welding@googlegroups.com
Subject: [MW:8469] Minimum Weld lengh for welder qualification
Dear friends:
Sometimes we have qualified four welders in the same coupon, for example in a 36" Ø pipe coupon the first two welders apply in overhead position one from 3 to 6 and the other one from 9 to 6, after they finish the cuopon is rotated in order to start the other welder couple as the same process. This has been accepted by our clients but I'd like to know if some code has a minimum lenght to be welded for qualification or it must be the entire cinrcunference of the pipe cuopon to be welded by a welder. I want to be prepared if a client supervisor ask me about it.
Eduardo Calva
QC Coordinator
Global Industries
México.--
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--
Manoj.Vernekar
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