April 9, 200719 yr Pack the tube with dry sand, weld on endcaps with a 1/8" hole in each to let expanded air escape, heat and bend. If you need a really tight radius, mitre and weld.
April 9, 200719 yr Author It was for a jury-rigged bending jig. No problems though, I just bashed it over the anvil to a rough 90, and then creased the end until it dropped into the hardy hole. Ugly but it works. The blacksmith makes the tools, eh?
April 9, 200719 yr Put a piece of round stock in the square tubing to support the walls of the tubing at the bend, heat and bend. This will also work for twists in tubing.
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