Fillet weld/ Groove weld Combination
Fillet weld/ Groove weld Combination
(OP)
How can I calculate de strength of a PJP (partial penetration) groove weld with reinforcing fillet weld. In tfis case I have a 1-in thick plate connecting a 1-in perpendicular plate, with 1/4-in groove each side and a 3/8-in fillet. Is just the sum off both effects? In this particular case it's not possible to achieve complete penetration because of the welded zone is not easy accessible. Thanks.





RE: Fillet weld/ Groove weld Combination
Remember that the weld size is 1/8 inch less than the depth of the groove preparation if the groove angle is less than 60 degrees.
However, don't take my word on this, check AWS D1.1 and the AISC Steel Construction Manual to verify I haven't lead to down the wrong road. I could be a raving crazy man for all you know.
Best regards - Al
RE: Fillet weld/ Groove weld Combination
Hg
Eng-Tips policies: FAQ731-376
RE: Fillet weld/ Groove weld Combination
What edition of AWS D1.1 are you looking at? I have the 2002 edition handy and paragraph 2.6.4 says you can consider each of the welds in a combination weld separately, each carrying a portion of the load. As an alternative, Annex I shows a method of determining the "throat" of the weld as I described.
Different editions of the code have different requirements, that's what keeps life interesting!
Best regards - Al
RE: Fillet weld/ Groove weld Combination
D1.1-2006, C-2.6.4:
"Fillet welds deposited over groove welds do not directly increase the effective throat of the joint; therefore the strength of the joint may not be taken as the sum of the strength of the groove weld and the fillet."
Again, if what's being talked about isn't really a "reinforcing fillet", then language regarding reinforcing fillets doesn't apply. 1/4" groove and 3/8" fillet doesn't make a whole lot of sense to me.
But you're absolutely right about it being the distance to the face of the weld and not simply a sum of the capacities of the individual welds.
Hg
Eng-Tips policies: FAQ731-376
RE: Fillet weld/ Groove weld Combination
A great discussion when there's cold brew and peanuts to share.
Best regards - Al
RE: Fillet weld/ Groove weld Combination
So your Equivalent Thickness would be:
2x[1/4*0.49 +3/8*0.60]= 0.70" in Shear
&
2x[1/4*0.49 +3/8*0.74]= 0.80" in Tension
With equal-sized welds, for equivalent strength:
t = 1"/{2*(0.60+0.49)} = 0.46" in shear
t = 1"/{2*(0.74+0.49)} = 0.41" in tension
[thus the old t/2 & cjp]
[don't forget lamellar tearing for T-joints]