Oxy acetylene gas welding is accomplished by melting the surfaces to be joined by gas flame and allowing the molten metal to flow together thus forming a solid continuous joint. Gas welding is particularly suitable for joining small thickness sheets. To join thick metals, filler metal is added to the weld in the form of welding rod.
The various gas combinations used for producing flames in gas
welding are:
i) Oxygen- Acetylene
ii) Oxygen-Hydrogen
iii) Air-Acetylene
The oxy-acetylene mixture is used to a much greater extent than the
other. The fig. illustrate the gas welding equipment.
a
Advantages
Dissimilar metals can be joined
Temperature can be easily controlled
Low cost and easy maintenance
Best suited for joining thin materials
Easily portable to any sites
Disadvantages
Not suitable for joining thick metals
Low quality and weld strength
More weld defects
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