I have been asked a lot at car meets how I curved my steel SHS tubing for projects I build...without crimping or the outside corner sucking-in.
So I thought someone may find this helpful. It sure does produce a great result and causes some head scratching.
pictures should explain the process. Important to chamfer the edges of the steel to ensure full weld penetration and increase surface area for the weld filler. I have used these on steps for monster trucks and have never had a failure....the tubing buckles long before the welding or HAZ. I do only weld with a TIG and I consider that crucial...