Spot Welding

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A spot weld which holds the bracket to the plate at point A as shown has a maximum twist of 100 Nm.?

A spot weld which holds the bracket to the plate at point A as shown has a maximum twist of 100 N*m. Determine the maximum load W.

Picture: http://i51.tinypic.com/2rfzleq.png

Now I've tried some few techniques, but I keep getting stuck. Any help is appreciated! Thnx!

The assumption here is that the twisting torque is the limiting factor that dictates failure, not the tension from the overhanging weight.

The arm is bent out at a 75 deg angle. Project it back into the plane of the bracket to figure out the radius at which the weight W is acting.

L = 125mm + 100mm x cos(75deg) =150.88mm =0.15088m
Torque is R cross F. F is W and is at 90 deg to R, so:
T = 0.15088m x W
Set equal to maximum of 100 Nm
100Nm = 0.15088 m x W
W = 100Nm / 0.15088m = 663N <==ANSWER

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