Can anyone tell me where in the D1.1 it tells u about backin

By Kix

Date 05-14-2007 15:10

I could of sworn i saw something about your backing material had to be the same material as that of your strongest plate for qualifying a WPS or for whatever application. I looked all over under backing and now i can't find it and i was wondering if someone could help. Example I'm quailfying a piece of A514 to a piece of A572 does the backing bar have to be A514 T-1 One more thing that maybe you guys can help me out on P.123 of d1.1 2006 4.7.3 base metal qualification it says steels listed in table 4.9 (A514)being one shal also qualify table 3.1 or table 4.9 steels in conformance to table 4.8. I'm haveing probs interpriting table 4.8 and was wondering if i qualify a test plate of 2 A514's does that save me from haveing to qualify table 3.1 steels with the same filler and from haveing to do any more procedures of table 3.1 steels to A514?
One more thing i promise!!! Does it say anywhere that you have to use the same tensile filler as the base metal you are welding on or is that just recomended.? We're using and 80 and 90psi wire on A514 t-1 that has a 100 to 130 ksi tensile range and i found that kind of od. Do you guys think the tensile pulls will come out using an 80psi wire?

By rickc

Date 05-14-2007 18:21

1) 5.2.2.2 on page 189 *might* be what you were thinking of.
2) By my reading, T4.9 says that if you qualified 514 to 514 then you can only do 514 to 514 off of that PQR. However, if you qualified 514 to 572, as in your first example, then you could do 514 to any Group I or 2 material or only 514 to 572 depending on what grade of 572 you were using.
3) 3.3 on page 57 would suggest you need to use a filler metal for your lower strength base material group for a prequalified procedure FWIW.

By Kix

Date 05-14-2007 18:44

Thanks very much that told me exactly what i need to know. However do you think i will get the tensile strength i need with the filler we're using (ER80S-D2 and E90C--D2) on the A514 T-1 A514 range is from 100ksi to 130ksi and i though the tensiles have to be in that range for the prcedure to qualify. Not saying they won't be, but i haven't done that match up yet.

By rickc

Date 05-14-2007 19:21

Sorry, I don't know but I'd be concerned about using a wire with a tensile strength that low on 514 to 514 FWIW.

By jwright650 (*****)

Date 05-14-2007 19:22

Don't overlook AWS D1.1:2006 Paragraph 1.2(1).

By Kix

Date 05-15-2007 12:02

A514 Is listed in table 4.9 on page 144 and it's range is anywhere from 100ksi to 130ksi. We're using A514 T-1 so i don't know what it's tensile strength is. So what am i suppose to go buy when the word Intended is used in the code.

By rickc

Date 05-15-2007 18:55

514's ultimate tensile strength must be 110-130 ksi (760-900 MPa) by the standard IIRC and T-1 is a popular trade name for US Steels 514 alloy. Maybe Mittal's How to Weld "T-1" Steels might be helpful to you:
http://www.mittalsteel.com/documents/en/Inlandflats/Applications/HOW%20TO%20WELD.pdf (PDF)

By Kix

Date 05-16-2007 12:58

I found an old WPS that this company qualified using short GMAW-S on the A514 T-1. Using ER80s-D2 it pulled at 25,650LBS witch puts it at 117,123psi witch is good and broke in the base material. Thats all i needed to see so now i'm not worried. I will be qualifying the procedure in spray arc with a metal core wire and solid wire. The metal core wire is an E90C-D2 wire. I did not find a WPS using this wire, but it should come out if the solid wire does.