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Old 01-28-2016, 10:23 PM   #21
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Anybody care to figure the shear strength off the fillet weld holding the frame horns to the frame? Looks like it's a 3/16" fillet weld. Frame strength is 35ksi per Ford spec. No idea what they use for an electrode. ER70S3 is common for robotic welding, which as the name implies is good for 70ksi. I don't remember if the horn is welded all way around the frame perimeter, or only along the sides. Maybe somebody can look, and measure the total length of the welds?

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Old 01-28-2016, 11:06 PM   #22
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Actually, the shear strength a bolt is about 60% of its capacity in tension. Put in "bolt shear strength vs tensile" into Google and look at the item from Portland Bolt. By the way an excellent source of information on all things threaded fastener.

Over the weekend I can look at the welds on those added plates and compute a pretty good value for their strength.

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Old 01-29-2016, 02:45 AM   #23
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You guys rock. I'm picking up my ambo this Saturday and will start gathering metal to start building...
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Old 01-29-2016, 11:13 AM   #24
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Originally Posted by carringb View Post
Maybe somebody can look, and measure the total length of the welds?
Mine are welded on 4 sides, roughly 10" of total weld length. 3" on both sides, 2" top and bottom.
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Old 01-29-2016, 11:44 AM   #25
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Originally Posted by Abitibi View Post
You guys rock....
I couldn't agree more. All kinds of stuff around here I would've never thought about.

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Old 01-29-2016, 06:37 PM   #26
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With all this calculating, You All Make My Brain Hurt!
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Old 01-31-2016, 10:24 AM   #27
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I did a winching class with Allen and the one thing he suggested to me was bring the van in and have them weld a plate on the crumple zone on the frame so I don't stretch it. It's still on the to do list

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Old 01-31-2016, 11:26 AM   #28
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One more vote for never having a problem. I've pulled hard enough with my 9000lb Warn winch to nearly stall the motor with no problems. Never the less, It couldn't hurt to do a close inspection to see if I'm headed for trouble

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