Effective Throat Area for Bevel Welds

[gordohongo112]

I need to figure out the throat area for a weld on a 1.5" rod welded to a pin eye. the weld type is bevel groove.

i am using this formula but it doesn't seem right to me:

A = pi/4 * [(Do-Di)/cos(chamfer angle)]

can someone tell me if this is correct or another formula.

thanks in advance.

 

[metengr]

It depends on the welding process regarding penetration. I have seen the following formulas in a report under AISC used to determine effective throat for flare bevel and flare-V groove welds, respectively;

E_t = 0.64 R for GMAW and FCAW (G), where R is the outside radius corner and the weld is filled flush

E_t = 0.31 R for SMAW and FCAW (S)


E_t = 0.64 R - D_f where D_f is the distance from the outer wall of the round to the weld face and the weld is NOT filled flush for GMAW and FCAW (G)

E_t = 0.31 R - D_f and the weld is not filled flush for SMAW and FCAW (S)

For flare-V groove, the constants 0.73 and 0.61 are inserted in the above equations.

 

[WoodyPE]

For fillet welds I've always used the distance from the vertex of the 90 degree angle (where there is little penetration) to the mid-point of the hypotenuse opposite the 90 degree angle (which is an air boundary). This assumes good weld penetration into the material, leaving the weld rod "filler material" as the thinnest cross-sectional material to fail.

In the case of a bevel weld I would likewise choose (within reason)the distance from the least penetration to the outside surface of the weld. The PE board of examiners tends to accept this approach as the real-world.