Blodgett Allowable Weld Force (Stress) Per Inch 3

[JoelTXCive]

Does anyone know how Blodgett arrives at his allowable weld force stress?

Specifically, the fillet weld allowable load of (11,200 lbf/in) X (the weld throat leg)?

Thank you in advance!

 

[CELinOttawa]

I believe the weld strength is based on the old standards used in the US, but this is only my belief. I'll be very interested to see other responses. You may need some of our "long in the tooth" members to chime in. If memory serves, the formula for this should be 0.66 Fu.

My copy of Design of Welded Structures has an added insert / addendum page that changes the weld strengths to higher than the original printing.

If no one gives the definitive answer by Monday, and I remember, I'll post the "extra" sheet from my copy...

 

[dik]

Gone into 'lala' land... back then I used to use a decimal ksi value for a 1" length, per 1/16" of an inch of weld and that was the extent. We used to rely on metal fabricators for connection design, almost exclusively.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Pmtottawa]

Totally agree with Celottawa...

 

[robyengIT]

excerpt from Addendum quoted by CELinOttawa

 

[Geoff13]

Blodgett has noted the allowable stress is 15,800 psi. Blodgett's ω is the leg size. A throat stress of 15,800 gives a leg stress of 11,170 psi. Since fillets are usually specified by leg size it's easier to have an allowable based on the leg size even though the failure plane is the throat size.

As for the allowable I note that both the E60 and E70 use allowable = 0.226 Fu. I do not recall a history for this value. More recent working stress codes use 0.3 Fu, or τ = 21,000 psi for E70 which gives 14,700 ω lb/in for a fillet weld.

 

[JoelTXCive]

This is great info. I edited my post to correct terminology. Thank you very much.

 

[CELinOttawa]

Okay, who gave pmtOttawa a star for agreeing with me...

Also: Ottawa? Where are you from, Illinoisey or Truckerville?