I have 2 plates that are fillet welded to each other. How can I determinate the max force the weld can take before it cracks?
The plates are only welded on one side because the other side is not reachable.
I added a image to clarify.
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Depending on the type of electrode and the properties of the base material, we get a wide range of possible answers.
Typical electrodes tensile strength is ranging between 60 -70- 80- 90 ksi. They ultimately fail at shear which we call f_w at ultimate level.
And we consider factor of safety of 75% let's assume a= width of the weld and L =length of the weld.
$$φ Rn = 0.75 f_w \times 0.707\times a \times L$$
So to simplify, you plug in 3mm=1/6 inch and 11mm = 15/32 inch length of the weld in the formula and input the f_w from the electrode's spec sheet.
At the same time you need to check the base material shear strength and factor of safety which is usually 0.60.