From the opposite side of the part and from a good distance away, heat that line until the colored line you just applied begins to fade and then completely disappears. Just a very dark brown to a slightly black line is all it takes. When I was first shown the annealing trick you discussed in your column, I was told to use an oxyacetylene torch and, with just the acetylene gas ignited, color the form line with a coating of that black soot that the acetylene gas, burning solo, creates. I thank you for them! I would like to offer some additional insight into the annealing process you discussed in your September 2021 article about forming aluminum 6061-T6. Reader Comment: First, you write some very good articles on sheet metal fabrication. Air forming into a narrow die creates a small inside bend radius, which can lead to cracking. When air bending aluminum 6061-T6 (or any material, for that matter), make sure you’re using the correct die width for the application.
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