Thicknesses for Prequalified Welds B-L1b

By Paul D Date 03-07-2012 15:15

We are welding a 3/8 inch plate to a 1/2 inch plate.

Are the T1 dimensions shown for B-L1b-GF (using a FCAW) in Figure 3.4 of D1.1:2010 for the thinner or thicker plate.

In other words, can we use a B-L1b-GF for this weld? If T1 is the thicker plate, can we bevel the 1/2 inch plate to 3/8 inch thick?

This is a static structure. Figure 2.3 seems to indicate that T1 is the thinner plate.

TC- L1b has same dimensions, so I could call the width of the 1/2 plate as T2 and this would qualify, but seems like sematics to get around the spirit of the code.

Thanks

By PWCameron (**)

Date 03-07-2012 21:15

In B-L1b-GF the T1 dimention is for both plates.
Fig 2.3 deals with Transition of width, not thickness (Fig 2.2 deals with thickness). Anyway...
The joint you discribe is a Butt, not a Corner or T- so TC-L1-GF would not apply.

Sounds like you are outside the requirements of Clause 3 and will require qualification per Clause 4.
PWC

By PWCameron (**)

Date 03-07-2012 21:30

Oops! Wrong Code Rev...
Fig 2.3 does deal with thickness. My bad. Draw a line through, date and initial my last post.

Still outside Clause 3, still requires qualification.
PWC

By jbndt

Date 03-07-2012 21:29 Edited 03-07-2012 22:24

Paul,

Here is one of hopefully many opinions … And that is all that anyone can give.

Notice on all of the 3.4 “B” figures that T-2 is absent? :confused:

I’d use fig. (B) in 2.3 … Its CHEAPER … Why grind or bevel? :cool:

Your “EOR” – Engineer Of Record should provide you with a drawing and an option or three!
That’s why HE makes the big bucks! :lol:

Cheers,
jb

By 99205

Date 03-08-2012 02:07

The EOR has to make the call the the loading the joint will experience. Each figure addresses a different type of load, ie; Statically loaded, figure 2.3 as opposed to cyclically loaded, figure 2.2.