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Re: [VAC] aluminum sheet repair
try heating the window frame with a small propane torch until it is evenly hot
and when you begin to weld the material should not actually melt- it
will lose its strength and coiuld become contaminated if it does
also re-heat the frame after welding - the weld and base material
will become "elastic" together
also if you grind aluminum welds (unlikle steel) you remove the
strength which is all in the structure of the bead