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Re: Where to Start? Firewall Repair
You have little to if any penetration on those welds, you need 100% penetration 100% of the time. Turn up the heat!
Any time you weld sheet metal you want a zero gap, easier to weld and shrinks less.
Make a tack weld, then move down the seam say 3 inches make another tack weld, do this til you reach the end of the seam. If you place random tacks you run the risk of losing panel alignment.
Once you reached the end of the seam, take a grinder and smooth out the tacks til they are just proud of the surrounding metal. Now place a new tack with say 30% overlap over the existing tack.
Repeat this weld grind weld grind til the seam is welded shut
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