Fillet Weld Reinforcement of CJP Bevel Weld 2

[dcoppo]

I don't have acess to D1.1 right now, but the AISC guidelines call for a minimum 1/4 inch fillet reinforcement for a CJP groove weld for a tee joint. My present research seems to show that this reinforcement is strictly a fatigue treatment. I have data for fillet reinforcement of partial penetration grove welds that provides the fillet size to match the fatigue strength of the base metal to the weld metal. Is this the correct criteria?

 

[connectegr]

For partial penetration welds, reinforcing fillets can provide additional strength. But the overlay is significant for small strength increase. And a reinforcing fillet can apply to fatigue loading in both CJP and PJP welds.

http://www.FerrellEngineering.com

 

[Duwe6]

It is for both fatigue and to eliminate a *major* stress riser at the Tee. Not uncommon for Design Eng to forget to put the fillet on the drawing. He got concentrated on loads, and forgot stress risers.

 

[Kiwi2671]

dcoppo,
I only have AWS D1.1 2004 but the Legend for Figures 3.3 & 3.4 Note 7 gives minimum sizes for reinforcing fillets on CJP Tee joints.
Regards,
Kiwi

 

[dcoppo]

Thanks kiwi2671. I would have NEVER spotted that note.
I checked in AWS D1.1/D1.1M:2010 which has some additional "Shalls"

Page 77 Note g: For both static and cyclic loading the fillet must be a minimum of T1/4 but not exceed 3/8 inch.
T1 is the part of the tee joint forming the stem of the tee.
(The joint figure is in the CJP group on page 100.)

I did a check on the joint I have with a stem of 1.25 and a tee flange of 4.5 inches and the fillet in this range does not change the Kt by more than 5 percent, but rules are rules. Again thanks.