The length of the slot weld can be obtained from the ratio of

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Engineers have found that the current slot and tab design limits the penetration depth of the fillet weld and the plug weld, thereby creating unfused areas

I always offset the tab inside the slot for welding purpose  slot and nickel or plated steel as a welding tab aid My welds are more than acceptable with this method however the thing that intrigues me about the slot

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