Oxy-Acetylene gas welding on mild steel

Oxy-acetylene gas welding is a fusion welding process that uses a flame produced by burning acetylene (C₂H₂) with oxygen (O₂) to melt and join metals.

2. Equipment Used:

• Oxygen cylinder (black)

• Acetylene cylinder (maroon)

• Pressure regulators

• Hoses (red for acetylene, blue for oxygen)

• Welding torch

• Welding tips/nozzles

• Spark lighter

• Protective gear (goggles, gloves, apron)

3. Types of Flames:

• Neutral flame (1:1 ratio of oxygen and acetylene) – used for most welding.

• Carburizing flame (excess acetylene) – used for welding high-carbon steels and non-ferrous metals.

• Oxidizing flame (excess oxygen) – used for brass, bronze, and certain steels.

4. Advantages:

• Portable and versatile.

• Low initial equipment cost.

• Suitable for welding, cutting, brazing, and heating.

• Ideal for thin metal sheets and maintenance work.

5. Disadvantages:

• Not suitable for welding thick sections.

• Slower than arc welding.

• Generates lower temperatures.

• Fire and explosion risks due to combustible gases.

6. Applications:

• Sheet metal work

• Automobile repairs

• Plumbing and refrigeration

• Metal sculpture and art

7. Safety Precautions:

• Check for leaks before use.

• Use in well-ventilated areas.

• Never use oil or grease on regulators or fittings.

• Keep cylinders upright and secured.

• Follow correct lighting and shutdown procedures.