Oxy-acetylene welding is one of the flame welding or gas weld process, because the flame is produced of mixture of gasses in a combustion chamber for heat provided to the job. Oxy-acetylene mixture of gasses most commonly used for producing high temperature 32600C.
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.
Oxy-acetylene Welding
CaC2 + 2H2O = Ca(OH)2 + C2H2
(Acetylene)
The gas acetylene( C2H2 )is play the most important role in Oxy-acetylene welding because it has the highest calorific value.
Advantages-
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-
- A cylinder carriage trolley.
- A Oxygen cylinder.
- A Acetylene cylinder.
- Oxygen regulator (regulating valve).
- Acetylene regulator (regulating valve).
- Black oxygen hose and red acetylene hose.
- Blowpipe and set of tips.
- Cylinder keys, spanners, goggles, gloves etc.
- Welding filler rods and welding fluxes.
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.
Aluminium —–––- 6500C Bronze —–––––9000C Brass —––––-8900C
Copper —–––––– 10650C Lead —–––––––3300C Steel(C 0.2%) 15500C
Grey cas-tiron–––12000C Zink —–––––––4250C Tin —–––––––2300C
Spot Welding Seam Welding Butt Welding Flash Welding TIG Welding MIG Welding Ultrasonic Welding
Plasma Welding Laser Welding Stud Welding Arc Welding Oxy-acetylene Welding Air-acetylene Welding
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