Below interpretation (IX-10-01) provide clear answer to this Q!
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of limesh M
Sent: Thursday, December 02, 2010 2:08 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:8481] RE: 8469] Minimum Weld length for welder qualification
Dear Kartik Sir,
I agree with you, If the Welder performance qualification test is only for one welder for one process/combination process by radiography.In this case we have no other option and the welder has to weld it's entire circumference to fulfill QW 302.2
But I disagree, if WPQT is for multiple welders. Suppose, I am qualifying 4 welders(2 GTAW+2 SMAW) as per ASME BPV SEC IX, with different process for positional welding(6G)in 12” Sch 140 pipe based on radiography. Two GTAW welders can operate in tandem to fill left and right halves of the pipe (Fill the groove from 6 O Clock to 12 O clock position of pipe depends on thickness range to be qualified). Then two SMAW welders can operate in tandem to fill the left and right halves of the pipe to complete the weld (Fill the groove from 6 O Clock to 12 O clock position of pipe).Once the joint is completed then I can send it for radiography.Obviously, radiography will cover 6” (150mm) weld length and entire circumference of the joint.Hence, I am not violating any of the clauses in ASME BPV SEC IX regarding welder/welding operator performance qualification test.
I couldnlt find anywhere in ASME BPV SEC IX that,a welder has to weld it's entire circumference for WPQT.It just insists, radiography shall cover the entire circumference of the pipe.As far as I am concerned,It doesn't mean that one welder has to weld entire circumference of a pipe to fulfill that requirement.As long as there is no written document with precise information,how a contractor can follow the things based on assumption?Otherwise it should be a mutual agreement between the client and contractor.
Expecting other members views on this subject.
Regards,
Limesh
2010/12/2 César Alexis Viteri Pérez <alexis_viteri@hotmail.com>
Dear Karthik,
As you clearly states (of course according to ASME IX also) when qualyfication is validated per RX, each welder has to weld the entire circunference, but what if:
the qualification is by destructive testing?
Due to materia/joint/width the weldement has to be done by 2 welders, one by each side?
Thanks & Regards,
Date: Wed, 1 Dec 2010 22:06:58 -0800
From: karthik6684@yahoo.com
Subject: Re: [MW:8477] RE: 8469] Minimum Weld length for welder qualification
To: materials-welding@googlegroups.com
| Hi, Thanks & Regards, (Karthik)
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 Dear friends: Eduardo Calva QC Coordinator |
No comments:
Post a Comment