Or.... (from another forum)
Quote
"For different angles or different tube sizes, vary the cut angles.
Its called 'birds-beaking' Practice makes perfect as always.
Done it plenty of times this way and ideal if mig welding as it includes a vee in the tube end, usually do the cuts in a cold saw, found that 42 degrees for the cuts are about bang on for a right angle fit to another tube for a good fit"