Not logged inAmerican Welding Society Forum
Forum AWS Website Help Search Login
Up Topic Welding Industry / Inspection & Qualification / Test specimen width
- - By SWN1158 (***) Date 03-22-2021 19:34 Edited 03-22-2021 20:46
We have a “CWI” on staff who is giving our welders the 1G limited thickness groove test, using 1/2” plate, which qualifies the welder for thicknesses up to 1” inclusive. I would think that the specimen width should be per Figure 6.8 Face and Root Bend Specimen, as Table 6.11 Welder and Welding Operator Qualification references, which would be 1 1/2” wide and 1/2” thick. Our “CWI is cutting 1/2” width x 1/2” thick specimen, which actually end up being 1/2 square, which I can’t believe is per D1.1

References are from AWS D1.1 2020

Any thoughts or comments are greatly appreciated.
Parent - - By Wyatt Ellis Date 03-23-2021 14:14 Edited 03-23-2021 14:20
From what I'm able to find in the D1.1 2020 :
- These are not direct quote but are my interpretations of the figures in the code.

(6.9) Side bend specimens in plate which is greater that 3/8" and up to 1 1/2" thick, the specimen shall be 3/8" wide x 6" long, with a maximum corner radius of 1/8"

(6.8) For transverse face and root bend specimens in plate which is 3/8" thick or less, the specimen shall be 1 1/12" wide x 6" long, with a thickness not less than the base metal plate (meaning when the weld reinforcement and backing have been removed the weld metal surfaces shall be flush with the rest of the plate) with a maximum corner radius of 1/8"

So I think your 1G groove tests on 1/2" plate should be side bends which are 3/8 wide and 6" long with a max corner radius of 1/8" (since the plate thickness is 1/2 there should be no machining or cutting to make the specimens less thick than the existing thickness of the plate, since it should be a side bend)

- again, this is my interpretation of what I'm seeing in the D1.1 code in section 6 - tables 6.8 and 6.9 on performance qualification.

Sounds like your inspector is doing it wrong.
Parent - - By 803056 (*****) Date 03-23-2021 14:25
The width of the side bends should be a nominal 3/8-inch. Bending 1/2-inch samples puts a lot of strain on the testing equipment and forces the sample to exhibit more than 20% elongation to pass without cracking. In short, the 1/2-inch wide weld specimen has to be "very" sound to bend to the radius typically used (1 1/2 diameter / 3/4-inch radius) for carbon and austenitic stainless steels.

The CWI may have an ASME background where a 1/2-inch thick plate, welded with at least 3 layers qualifies the welder for unlimited thickness. However, even Section IX requires the side bend specimen to be 3/8-inch wide, not 1/2-inch.

Parent - - By jwright650 (*****) Date 03-25-2021 19:11
Scott, I agree with Al:
1" coupon side bends are 3/8" slices x 1" material thickness
3/8" coupon face/root bends are 1" slices x  3/8" material thickness
3/8" coupon side bends end up square 3/8" slices x 3/8" material thickness
1/2" coupon side bends would be 3/8" slices x 1/2" material thickness
Parent - - By SWN1158 (***) Date 03-26-2021 10:25
Ok. Thanks y'all :)
Parent - - By jwright650 (*****) Date 03-26-2021 11:30
My homemade bend jigs would have an issue bending 1/2" thick slices due to the clearance dimensions between the plunger and the rollers. Mine was built using the dimensions shown in the test jig figure in D1.1. If I get samples cut that are even slightly over 3/8"(cut on the wrong side of the soapstone line), I have a problem pushing them through even with the 20T jack that bends the 3/8" material easily.
Parent - By 803056 (*****) Date 03-26-2021 16:22
I had my bending machine on the job one time and while I was at lunch a welder tried to bend his 1-inch thick coupon. Needless to say, it didn't and I had to rebuild the bending machine. Lesson learned, never leave your tools out where some idiot can abuse them.

Up Topic Welding Industry / Inspection & Qualification / Test specimen width

Powered by mwForum 2.29.2 © 1999-2013 Markus Wichitill