An oxyfuel gas jlame that has characteristics neither oxidizing nor reducing.
See Figure A-1. See also CARBURIZING FLAME, OXIDIZING FLAME, and REDUCING FLAME.
A neutral flame is obtained by burning a mixture of approximately 50% acetylene and 50% oxygen; it is a well balanced flame indicating complete combustion. The cone next to the tip is white hot and beyond it is a long blue streamer. The molten metal produced in welding with a neutral flame is quiet and clean, and flows well. Few sparks are produced. See OXIDIZING FLAME, CARBURIZING FLAME, and ACETYLENE,
Metalworking with Acetylene.