Welding Plate to Round HSS Wall

By jwright650 (*****)

Date 06-12-2018 15:02

Does your bend radius work out for r?

By Brent1 Date 06-12-2018 15:35

It does. It's a 1.900x.188 HSS.

By jwright650 (*****)

Date 06-12-2018 16:28

I'm out in the field at the moment. Does the cjp version of that joint fit your situation any better? I'm thinking that your weld nuggets may overlap on something that small and you end up with full pen or very close.

By Brent1 Date 06-12-2018 17:06

I am unaware of a prequalified CJP flare weld.

By jwright650 (*****)

Date 06-13-2018 10:57

You guys are right....In Fig 3.3...the CJP's stop at 9 (double J groove), no 10's (flare bevel groove) listed

By 803056

Date 06-12-2018 18:25 Edited 06-12-2018 18:35

There is no such thing as a CJP flare bevel or flare V-groove if one stays with prequalified joint details.

The weld size is a function of the corner radius, which for the purpose of calculations is a function of the wall thickness. If D1.1 is the governing document, Table 2.1 lists the weld size for the prequalified grooves in question. The weld size can be increased if the WPS is qualified by testing per clause 4.11.5.

Regarding your original question is this post, the figure C-4.1 may provide a little insight. According to the figure, the longitudinal weld is considered to be a fillet. If that causes your head to spin you could use the correction factors of Annex B to calculate the required weld size needed to produce the weld with the necessary effective throat. Most designers ignore the subtleties.

Al

By Brent1 Date 06-12-2018 18:34

Al,

Thanks for the reply. However, I am referring to the 'f' value which is the landing/length of contact between the 2 parts. The prequalified flare weld requires a 3/16" minimum landing length. If this is the case, then can a BTC-P10-GF not be used in this situation? If not, what weld should be use.

By 803056

Date 06-12-2018 19:23

As I pointed out, the commentary simply calls it a fillet weld.

Al

By Brent1 Date 06-12-2018 20:00

You did point that out. Thanks.

By Brent1 Date 06-12-2018 20:08

One last question, I see that figure C-4.1 applies when the thickness of the plate is welding to the HSS, but what if the plate face was being welded to the HSS?

Kind of like this (The "I" is the plate and the "O" is the HSS):

I
IO
I

By 803056

Date 06-13-2018 01:16 Edited 06-13-2018 18:43

It is amazing how much a "sketch" or graphic clarifies the situation. I would write it as a prequalified WPS and expand upon it by performing macroetches per clause 4 to demonstrate the size of the weld can meet the requirements of the drawing.

The joint could be considered to be a BTC-P10, but the weld isn't filled flush with the OD of the HSS. The size listed by the table for the BTC-P10 is the maximum weld size, so the 2nd sentence of clause 2.4.1.4 would be how the actual weld size is determined once it has been demonstrated (via. the macroetches) the required weld size is possible.

Just my opinion.

Al

By welderbrent (*****)

Date 06-13-2018 18:41

Okay, now you really lost me....Clause 11??? And just when I thought I was following this.

He Is In Control, Have a Great Day, Brent

By 803056

Date 06-13-2018 18:44

Oops!

Nice catch Brent. Thanks.