AWS B 4.0 Bend radius question.

By Kix

Date 09-05-2014 18:25

I'm just wanting to double check a bend radius for a bend test. We're working to NAVSEA Tech Pub 248 which calls out AWS B 4.0 for destructive testing. I don't have 4.0 to reference and was wondering if anyone can help me out. The coupon is 3/8" thick plate, 308L stainless steel GTAW welded to 70/30 CuNi in the 1G position. Filler is ERNi-1. Joint prep is a full penetration V-groove welded from one side with argon purge. I can give more detail if needed, so I must apologize if I left anything out.

Thanks,
R.J.C.

By ssbn727 (*****)

Date 09-06-2014 08:53 Edited 09-06-2014 20:53

Here's a link worth investigating:

http://www.standardsdoc.org/aws-b40-2007-pdf-p-119.html

Edit: Is this correct or did you mean to write 304L instead of 308L which is a stainless stl. filler metal... Here's what you posted:

"The coupon is 3/8" thick plate, 308L stainless steel GTAW welded to 70/30 CuNi in the 1G position. Filler is ERNi-1." 308L is used to weld 304L together and sometimes to weld together 304 with 316L.

Respectfully,
Henry

By Kix

Date 09-10-2014 00:14 Edited 09-10-2014 01:29

Henry,

Yeah, I got in a hurry and meant to put 304L. I had 308L on the brain because someone was asking me about the type of stainless steel MIG wire we use on a particular project. I think they should name that link you posted something like "everyspec 17 bucks.com". :lol:

2010 ASME sec IX for 17 bucks. Talk about not holding value.

Thanks,

R.J.C.

By 803056

Date 09-06-2014 12:52

((100 x t)/E)-t = D
t = thickness
E = elongation
D = Diameter

not to exceed 20% if my memory serves me correctly.

You really need to obtain a copy of the standard.

Best regards - Al

By Kix

Date 09-10-2014 01:27

Al,

I concur with your assessment about the book. :grin:

I'll tell the old boss that I really need this spec to keep an eye on the test lab. You have to watch those guys sometimes. Had a few coupons this week where they missed the UT testing on our GMAW-S plates per TP-248. Although, I'm sure you don't really see to many GMAW-S tests per NAVSEA anymore. Anyway, thanks a bunch for the formula. 20% puts it right at 1.5" dia which is what the lab specified so your memory serves you well. I think 70/30 CuNi was at 30% and 304L SS was like 55%.

Thanks again,

R.J.C.

By 803056

Date 09-10-2014 01:43

The formula is different for materials such as 6061-T6 (16 x thickness). Some standards use 20% elongation as the standard for most materials. You'll find that even when the material's elongation is more than 20%, they will fail if you approach their actual elongation. Read the fine print.

Best regards - Al