1.3 GAS WELDING
• Basically, filler and base materials are heated to the point of melting by a burning a gas.
• Two common types are,
- oxygen-acetylene
- mapp gas
• These are suited to a few applications, but they produce by-products that can contaminate the final weld.
• Typically the flame is adjusted to give a clean burn, and this is applied to the point of the weld.
• A welding rod will be fed in separately to melt and join the weld line.
• Flux can be used to clean the welds.
• Process variables include,
- gas and oxygen flow rates
- distance from surface
- speed
- material types
- surface preparation of materials