D1.5 PQR Root Opening

Date 09-14-2010 15:49

Just write it so that it complies with Table 4.5(33) and Figure 3.4...that way you won't have to requalify with a new PQR.

By eekpod

Date 09-14-2010 15:55

hey buddy, are you in the bridge code?? Those referances don't line up to D1.5

By jwright650 (*****)

Date 09-14-2010 15:57

LOL....please excuse my lack of attention......I didn't read the title to your thread until after you asked what code I was in...sorry I was in D1.1

By eekpod

Date 09-14-2010 15:53

I see in Table 5.3 for FCAW item #23 b says "a decrease in the root opening" is listed as an essential variable. And Table 5.3 references the text from 5.13.3, and because 5.13 is "Production WPS" that's my link to Table 5.3.
Which tells me I can't decrease my root opening form what I test it at.

By jwright650 (*****)

Date 09-14-2010 16:03

I agree with no decrease in Ro but also that you can't exceed the tolerances in 2.12 which takes you to Figure 2.4

By eekpod

Date 09-14-2010 16:42

right, so I have 30 degree included bevel, I can reduce the RO by only 1/16" "as fit up" or increase it by +1/4". B-U2a-GF

By jwright650 (*****)

Date 09-14-2010 16:52 Edited 09-14-2010 16:55

Does Table 5.3(23b) take presedence over the minus 1/16" As Fit-up dimn in Figure 2.4?..which says no decrease in RO

I'm thinking it would. So the fit-up tolerance would be (+1/4, -0) for your RO from what you test at with the PQR

By eekpod

Date 09-14-2010 17:09

I was wondering that myself as was walking through the shop. So whatever you test the PQR at, locks one into the R.O and bevel angle?
Either 3/8 RO at 30 degrees or 1/4" at 45

By jwright650 (*****)

Date 09-14-2010 17:15

"Either 3/8 RO at 30 degrees or 1/4" at 45"-[end Quote]

...which ever you test with, you're stuck with, is how I read it.

By eekpod

Date 09-14-2010 17:20

yeah, I'd agree, don't like it but yes.

By jwright650 (*****)

Date 09-14-2010 17:26

If I'm thinking about this correctly, I would say that.....

.....if you tested with 30° and 3/8" RO, then you could open the angle up to 45° but you're stuck with the 3/8 RO. (wastes time and materials to fill that bevel up)

.....and if you tested with the 45° and 1/4 RO, then you can open the RO up to 3/8, but can not decrease the angle to 30°. (again wastes time and materials)

By eekpod

Date 09-14-2010 18:04

I'm on the same thought process as you but...the term "decrease" is messing with me.
If I have a 30 degree included bevel angle, I am increasing it to 45, not decreasing it.

By jwright650 (*****)

Date 09-14-2010 18:11

right....

By CHGuilford (****)

Date 09-16-2010 16:44 Edited 09-18-2010 02:17

The root opening doesn't directly translate into a parameter range.

If you are testing to 5.13, then Table 5.3 #20 would apply. If it's per 5.12 then your passes are governed by the heat input restictions.

Edit:
I didn't finish the comment the other day - had to run & gun.
The groove configuration used on a PQR would not limit you as far as the joint configurations you can use. Any of the prequalified D1.5 joints are OK. (If you want to use some other joint that is not prequalled, you'd need to run a new test anyway). Fillets are OK too, as long as you run a successful fillet tee test within the PQR's numbers.

What you are limited to for a joint detail is that you would need to stay within 25% of the number of passes you ran on your PQR. Thicker or thinner joints, or different configurations must use a proportional number of passes. This basically means that each pass should be about the same size in cross sectional area. If you are within your essential variable ranges, that will happen anyway.
And this assumes a PQR per 5.13.

If you are using 5.12, you don't have the 25% restriction but the limitations of variables will keep you in a range that will accomplish the same thing.