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RE: 5/16 Fillet Weld

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Neil

 

No, I didn’t mean more passes would be required. Bill was correct in stating that a 5/16 fillet is a single pass weld. I am saying that the cross sectional area of a 5/16 fillet is 3 times larger than that of a 3/16 fillet requiring 3 times more filler metal to be deposited. A welding operator cannot move the arc 3 times faster in order to deposit filler metal at the same speed he would for a smaller weld.

 

Bills’ thinking is wise because it provides sacrificial material for the corrosion process. This is done all the time in steel mills, particularly in the by-products area, where the “more is better” theory prevails.

 

My intent was to point out that engineers who specify larger than required welds on their projects dramatically increase the cost of the job. I was taught that the second highest outlay of a fab shop was hydro, and welding consumes a lot of hydro.

 

Regards,

Dave

 


From: Neil Moore [mailto:nmoore(--nospam--at)innercite.com]
Sent: January 11, 2006 6:26 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: 5/16 Fillet Weld

 

Bill:

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.
ALLEN DESIGNS
Consulting Structural Engineers
-----Original Message-----
From: dave lowen [ mailto:jatech(--nospam--at)kwic.com]
Sent: Wednesday, January 11, 2006 11:34 AM
To: seaint(--nospam--at)seaint.org
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.
 
Regards,
Dave Lowen
V 519 587 5797
F 519 587 5138
E jatech(--nospam--at)kwic.com