Is there a AWS/ASME/API procedure that's written down for the 6G 6" schedule 80 certification test? Keyhole first pass?? Second pass is whipped?? Grinding allowed?? How Much Grinding, and when?? Size rods?? Type of rods?? (as in, can a 6011 be substituted for a 6010??) Must a weave or stringer beads be used??ETC.
I can' seem to find very much on this topic where I work, or on line.
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03-24-2010, 03:56 PM #1
Procedure for Pipe Welding 6g Cert. Test
03-24-2010, 10:04 PM #2Senior Member
- Join Date
- Jun 2004
There are several factors
The weld procedure spec (WPS): this defines essential variables for the weld, such as filler metal(s), process(es), number of passes, open root or backing, heat ranges, pre and post heat, etc. For the mosst part, the standards (ASME, AWS, etc) specify how the procedure should be written (format, what factors must be included....) and how it is qualified (tests that must be done on samaple welds, such as tensile, impact, and so on), but not the detais of how the weld needs to be done.
The welder qualification: The codes specify generally how welder performance is verified based on the finished product, by specifying what mechanical tests must be performed on the test sample (bends, radiography.....) and what acceptance criteria are for the test samples, but, other than the requirement that a particular WPS needs to be followed and that the test needs to be witnessed by an appropriate person (such as a designee of the company/contractor for ASME certs), the details of how the test is administered are left pretty open.
Whoever you are testing for will usually decide whether grinder is allowed, specify the WPS (which may be very specific about technique, or fairly loose), decide electrode size and type, time limits for the test, and so on.
As a general rule, the electrode use in the test will be that specified in the WPS (often, if the WPS permits multiple electrodes, the one considered toughest to run is used, such as a WPS that permits 7018, 8018, and 9018 will likely be qualified using the 9018), even if substitution is permitted in production welds (such as, under ASME sec IX, 6011 and 6010 are interchangeable in many cases, both being F-3 fillers, even if the WPS doesn't state both).
There are a number of standard procedures for this weld, a common one being 6010 root/7018 fill and cover, upward progression, with ANSI/AWS B2.1-201 being a typical procedure that is accepted under most AWS sections as well as by ASME without the user needing to do a procedure qualification. https://www.awspubs.com/product_info.php?products_id=76 Note that if an SWPS such as this is used as the WPS (rather than one qualified in house) under ASME rules, then substitution of fillers is NOT permitted. A SWPS specified with 6010 MUST be run with 6010, even though 6011 could be substituted if it was a procedure written/qualified by the user.
The API rules and the AWS rules are a little different in detail than the ASME rules for writing and using WPS's and qualifying welders, but most of it still depends on the employer/contractor/etc.
03-25-2010, 02:14 PM #3
You didn't say if you were certifying uphill pipe, or downhill pipe.