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Welding history

Classification of welding

Effect of welding speed

Welding defects

Types of welding joints

Welding position

Welding electrodes

Types of welding flame

Welding flux

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Welding symbol

Welding edge preparation

Advantages of welding joints

Thermal properties of metal

Welding safety

Types of welds

Brazing

Soldering

Oxy acetylene welding

Oxy acetylene welding

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.

Gas Welding Torch

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-

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

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Oxy-acetylene welding