Table 3.1 Filler Metal question

Date 11-16-2006 20:52

I'll try this question here, maybe I'll get a greater response than on the technical page.

We are bidding a job for column to column splice connections using both A572-50 and 572-65 material. Welding using full pen, SMAW and or FCAW process.

Someone please confirm for me I an interpreting Table 3.1 correctly.

To make a weld of 572-50 to 572-50 would be E 70 filler wire per group II

To make a weld of 572-50 to 572-65 could be either E70 or E80 because of note #1 "that which matches the higher base metal strength ( E80), or #2 that which produces a low hydrogen weld (E70).

and finally to weld 572-65 to 572-65 would have to be E80 series wire per group III.

There are approx 300 splices so I want to make sure they bid this correctly because we would have to use a different wire than we currently use now. thanks Chris

By hogan

Date 11-17-2006 00:22

from what i see, your splicing (cjp)2 wide flanges to be erected in the field vertically (to form a compression joint). if so, look at aws D1.1(06) table 2.3
type of applied stress-compression
allowable stress- same as base metal
required filler metal-same as base or one less

if you look at 3.3 there is a table ( not refrenced as a table in the code book), with a note: see table 2.3 (allowable stress) or table 2.5 (allowable stress in tube) to determine the filler metal strength requirements.

as for table 3.1 note 1: (1) for matching higher strength base metal and (2) i read this to say if you match the lower base metal, then you will need to use a low-hy filler

By eekpod

Date 11-17-2006 11:40

hogan, thanks,

So by taking Table 2.3 into account, I can use E70 series wire on all these connections because it matches the base metal for some splices, but more importantly, because of 2.3 I am allowed to use a "filler metal with a strength level one classification less than matching".

Thanks for your input, Chris

By hogan

Date 11-17-2006 14:26

yes, but it should be low-hy.

By eekpod

Date 11-17-2006 16:02

Thanks, yes we only use Low hydrogen anyway, thanks, Chris

By Joseph P. Kane (****)

Date 11-19-2006 21:40

I think you should not make any decision on which electrode to use without consulting the EOR.

By hogan

Date 11-20-2006 14:24

i think he is just trying to bid a job, the electrode requirements should be in the job spec's

By ryland

Date 12-15-2006 17:46

is this a bid type package? if so and they have not hired an engineer to compllete this work, you foks should these questions you ask should be known by heart and if you don't than you need to hire someone that does, liability is of most importance and a welder with any salt should be able to tell you what can or cannot be done in the feild as well.

By js55

Date 12-19-2006 20:39

Maybe I'm missing something important here, but given the base metals involved(quite common)(and Note #1 of Table 3.1-matching the lower strength if LH), E7018 is an acceptable choice, certainly overmatching the A572 50 minimum strength level. And also given that this electrode is very common its pricing is a viable alternative for the bid stage. Undermatching may be acceptable but I'm not sure its cheaper in this case.

By HgTX

Date 12-21-2006 22:24

Is it really correct to say that E70 overmatches Gr. 50? I guess the minimum yield of 58 ksi is higher than 50, but in both D1.1 and D1.5 it's defined as the matching electrode.

Hg