It is oldest development fusion welding process. No pressure is required on the job to be welded, the heat is drive to welding the pieces. The acetylene is obtained by the action of oxygen and calcium carbide.
CaC2 + 2H2O = Ca(OH)2 + C2H2
The gas acetylene( C2H2 )is play the most important role in Oxy-
In gas welding the heating and cooling rate is slow, so it is advantage in some material welding from welding failure.
The flame can be controlled easily where need low and high temperature for welding or brazing or soldering.
Filler metal deposit rate can be controlled easily, because source of heat and filler metals are separate.
Preheating facility is in welder’s hand. So where required it can be applied.
In comparison of other welding process, it is low cost and low maintenance.
Complete set of gas welding-
Nozzle sizes for various metal thickness-
Nozzle size 1 2 3 5 7 10
Plate thickness 1/32 3/64 1/16 3/32 1/8 5/32
Gas welding temperature for various common material.
Copper —–––––– 10650C Lead —–––––––3300C Steel(C 0.2%) 15500C