Nearly new tip, no trouble with welding tips. Handle valves are fine. Using 10 psi acetylene and 12 psi oxygen, both tanks over half full Good seating surface, no hose leaks.
No trouble starting and adjusting flame, but after several minutes it suddenly backfires once, then a second later it pops off completely.
Tried different pressures but lower acetylene pressures seems to make it worse. Why does it work fine for several minutes and then suddenly backfire without touching anything????
It's consistently doing this, help, I'm stumped.