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@Jung
Pissing around with some scrap tubing, trying to tweak my notcher as much as anything. This is 16ga mild steel in 1 1/8” and 3/4”. Interestingly, even though the tubing is the same thickness, I needed two different torch tips. The cluster was at the limit of an AW205 which is it the biggest I have at the moment. Lot of gas and heat required.
Also, very minimal warpage, considering I didn’t clamp anything. Tacked and then ran little beads like you’d tighten a cylinder head. A little bit on opposing sides at a time.
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