Automatic brazing machine for the manual hacksaw. The machine consists in three stations: a) parts loading/unloading b) automatic brazing  c) parts loading/unloading. The operators load and unload the raw material and the finished hacksaw  alternatively from the station a and c., and the automatic brazing comes only in the station B. the machine works with propane (or natural gas) and oxygen. The heating is done by pre-heating groups specially prepared with a possible soft moves of the flames in order to distributes the heating homogeneously.