ASME Sec. IX Question.

Date 09-29-2009 01:39

2" XXH (0.436" thick) is not quite thick enough to provide unlimited thickness. If you do a GTAW root and hot pass, you have about 1/8" of deposited GTAW thickness. That would qualify for groove weld deposit thicknesses up to 2 times the deposited weld GTAW weld metal thickness, or about 1/4" max. If you fill the rest out with SMAW, you would deposit about 0.311" (0.436" wal thickness - 0.125" of GTAW = 0.311" of SMAW) which is ~5/16". So that would qualify for SMAW groove weld weld deposit thicknesses up to 5/8".

To qualify for unlimited groove weld deposit thickness, you must deposit at least 1/2" of weld metal with a minimum of 3 weld layers for each process. Some folks use the 2" NPS x 5/8" wall thickness pipe coupons, so that 1/8" of GTAW is deposited and 1/2" of SMAW is deposited. This qualifies for unlimited thickness groove weld deposits with SMAW and 1/4" max groove weld deposits with GTAW.

Diameter limits are a separate essential variable from deposited weld metal thickness. The table in QW-452.3 shows that:

1. A test coupon outside diameter (O.D.) less than 1" qualifies for the size welded and greater diameters. (Notice this is O.D. and not NPS.)
2. A test coupon O.D. of 1" up to 2-7/8" qualifies for 1" O.D. and greater diameters.
3. A test coupon O.D. over 2-7/8" qualifies for 2-7/8" O.D. and greater diameters.

By stickwelder (*)

Date 04-29-2010 22:58

I have been looking for the coupon requirements per ASME IX for testing on 2"xx. I wanted to find the size and location of the coupons for welder performance testing. This is for student practice, not for a code application, but i would still like to pull the coupon sizes and locations correctly with code. I have looked over QW462.2 and QW462.3 for this information, but am not finding what i want to know. My question is at what thickness/diameter should i go from transverse root and face bends to side bends? I tend to think on .436" thickness, that side bends would be in order. QW 452.1 shows 2 side bends or one face and root bend. Location of these coupons would then be my next question. Everything i have found (location wise) is for four bend specimens. Perhaps i am not looking in the best location for the information.
Again, this is just for student practice but i would like to run it like a code performance test. I found in d1.1 table 4.11- 4 side bends in the 6g position, but i assume this weld would be more common for an ASME application.
By the way, these two students are running GTAW roots and hot passes. Would it be more common to see this filled and capped with 7018 than tig? I assume so, but am not real familiar with this type of work-mostly structural.

thanks in advance for any guidance

By north_fl_cwi (*)

Date 05-03-2010 19:30

QW452.1 gives you the amount of bends required depending on what your thickness is and based on type of bend.

Figure QW463.2(d) & (e) shows locations to remove the bend specimens from. (page 176 in 2007/2009 edition). And I agree, the format is not laid out very well (to me) to be able to find something that should be simple to find (in my opinion).

From what I have seen, some manufacturers allow a root and hot pass with GTAW then the remainder 7018. Some test are specified a root pass ONLY with GTAW and the remainder 7018. Just depends.

By stickwelder (*)

Date 05-04-2010 20:56

Thanks for your post. This is where i was looking, i guess i have to "assume" out of the four side bend locations that i should pick any two oppisites? 452.1 calls for two side bends(or one root and face bend) and 463.2 gives locations for four.
Also, thanks for the info on weld processes. The GTAW root and hot is what i was planning on using.

I just answereed my own question as far as location of the two side bends. 451.1 (a) note 1-using 5g or 6g, a total of four bend specimens are required.
Watch the notes following tables! There were plenty of those questions on the CWI test, how could i forget?

By dlmann

Date 09-29-2009 11:31

Take a look at these coupons. They may be what you looking for. There are others out there called super coupons.
2-3/4"O.D. x 5/8" wall Monster Coupon.
The Monster Coupon will qualify for unlimited thickness and diameters as small as 1" O.D. using two weld processes.
http://www.trieng.com/monster.html

By cmays

Date 09-29-2009 14:34

Yah thats a big one but we are qualifying with smaw only for this job.