Oxyacetylene gas welding on AIuminium

Oxyacetylene welding is a gas welding process that uses a flame produced by burning acetylene in oxygen. It's typically used for joining metals, including aluminum in some cases.

Key Characteristics When Welding Aluminum:

• Melting Point: Aluminum melts at a relatively low temperature (~660°C), making it suitable for gas welding but prone to overheating.
• Oxide Layer: Aluminum forms a tough aluminum oxide layer (~2050°C melting point), which must be removed before welding. This is usually done using a stainless steel wire brush or chemical cleaning.
• Flux: A special aluminum welding flux is required to prevent oxidation during welding and help clean the joint.

Welding Process:

1. Surface Preparation:
• Remove oxide layer and clean the surface thoroughly.
• Apply flux to prevent reoxidation.
2. Torch Settings:
• Use a neutral flame (equal parts oxygen and acetylene).
• Avoid oxidizing flame (can degrade aluminum).
3. Welding Technique:
• Use a soft, sweeping motion to avoid overheating.
• Use appropriate aluminum filler rod.
• Flux residue must be cleaned after welding to prevent corrosion.

Advantages:

• Portable and inexpensive setup.
• Suitable for thin aluminum sheets.
• No need for electricity.

Disadvantages:

• Not ideal for thick aluminum sections.
• Higher skill required due to aluminum’s heat sensitivity.
• Flux residue can cause corrosion if not cleaned properly.