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RE: 5/16 Fillet Weld

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I had a fabricator tell me recently that everything in their shop is 5/16" minimum, even if the drawings call for less.  But they are a smaller shop where the extra bit of metal is worth the cost because they can be more consistent and eliminate double-checking the drawings.  And it sounds good to their customers.
Jim Wilson, PE
Stroudsburg, PA

Bill Allen <T.W.Allen(--nospam--at)> wrote:
Neil ?
5/16? F.W. is still a single pass weld.
Just the same, I?ll read (re-read, I haven?t read it this century) some Blodgett tonight.
The best source I have right now is that the welder on this job doesn?t think this is an expensive item and they are questioning everything!
Thanks for your comments.
T. William (Bill) Allen, S.E.
Consulting Structural Engineers
-----Original Message-----
From: Neil Moore [mailto:nmoore(--nospam--at)]
Sent: Wednesday, January 11, 2006 3:26 PM
Subject: RE: 5/16 Fillet Weld

Dave's comment is good.  What he might of meant was that more weld passes would be required.  We weren't interested in a particular job but the overall economy of any project where welds larger than really required will increase the costs.  

It might be of value to read  Section 7.5 in Blodgett's "Design of Welded Structures", one of  the structural engineers bibles.

Neil Moore, SE, SECB
neil moore and associates
consulting structural engineers
shingle springs, ca

distressed structures investigations

At 02:04 PM 1/11/2006, you wrote:

Dave ?
Yep, that was me.
I understand your point about the difference in the quantity of weld metal deposed. I?m not a welder, and I?m not sure the deposition rate is the same.
The bottom line: The welder on this job says this about the proposed change: ?No Biggie?.
T. William (Bill) Allen, S.E.
Consulting Structural Engineers
-----Original Message-----
From: dave lowen [ mailto:jatech(--nospam--at)]
Sent: Wednesday, January 11, 2006 11:34 AM
To: seaint(--nospam--at)
Subject: 5/16 Fillet Weld
I think it was Bill Allen who posted a message this morning (I deleted it already) regarding changing a fillet weld size from 3/16 to 5/16 because it only amounted to a little more electrode.
In fact, a 5/16 fillet requires approximately 3 times the electrode as a 3/16 weld.
One could assume that if the deposition rate in pounds per hour were the same for both welds then the larger weld would take 3 times as long, a substantial labor cost.
Dave Lowen
V 519 587 5797
F 519 587 5138
E jatech(--nospam--at)