Weld Problem
Weld Problem
(OP)
Hey guys,
I am trying to determine weld throat for a certain loading case (see attached file). This is my first time working on weld strengths so I am not sure if my answers are valid.
Given the dimensions, a safety factor of 4.5, and electrode tensile strength of 70 ksi, I am getting some unreasonably low throat sizes for the fillet welds.
I am getting .012 in for the throat size of the weld? What am I missing here.
The load type I am assuming is pure tensile.
I am trying to determine weld throat for a certain loading case (see attached file). This is my first time working on weld strengths so I am not sure if my answers are valid.
Given the dimensions, a safety factor of 4.5, and electrode tensile strength of 70 ksi, I am getting some unreasonably low throat sizes for the fillet welds.
I am getting .012 in for the throat size of the weld? What am I missing here.
The load type I am assuming is pure tensile.





RE: Weld Problem
You've got what looks to be 34 linear inches of weld. Not so many lb/in.
How much confidence do you have in that last 5 thousandths of a lb?:)
Regards,
Mike
RE: Weld Problem
Using information from AWS publications;
Allowable stress = 0.3 x UTS of the fillet weld x (1.0 + .5 sin1.5 theta)
theta = angle of loading to the fillet weld in degrees
so stress = 0.3 x 70 x (1.0 + .5 x 1 (90 degrees)) = 31.5
Now the fillet weld size = Applied Load/[(31.5)x 2 welds x length of weld x .707]
RE: Weld Problem
Note: 0.928 kips/ in is for ASD, 1.392 kips/in for LRFD.
http://www.FerrellEngineering.com
RE: Weld Problem
1) @ metengr: the stress given is as follows:
0.3 x 70 x (1.0+.5x1(90deg))
What is the the 0.3 factor?
2) @ connectegr: what is ASD and LRDF?
RE: Weld Problem
LRFD Load & Resistance Factor Design - ultimate strength loading
These methods of structural analysis, and require that the weld strengths are proportionate to the method used.
I would expect the loads you are showing to be service loads. And the weld size I showed above is the leg size, not the throat size. Fillet welds are noted by leg size.
http://www.FerrellEngineering.com
RE: Weld Problem
RE: Weld Problem
My apologies.
RE: Weld Problem
If you were to use D1.1 as the basis of design, the minimum fillet size would have to comply with table 5.4 to ensure sufficient heat input to ensure good ductility in the weld.
Best regards - Al