We have seen the overview of a welding process, Arc welding process and Gas welding process with the help of our previous posts.
Let us get more in depth and understand now the types of flames in Gas welding with the help of this post.
Types of flames in Gas welding
The types of flames are displayed here in the following figure. The correct adjustment of the flame is very important for the production of satisfactory weld. Welding flames can be classified into the following three categories as mentioned below.
Neutral or balanced flame
Reducing or carburizing flame
Oxidizing flame
Neutral or balanced flame - Salient features
Equal amount of Oxygen and acetylene
Balanced flame
Application areas mainly stainless steel and mild steel
Generates Less Smoke & Sparkle
Flame inner Cone will have a temperature of 3200 °C approximately
Flame outer envelope will have a temperature in the range of 1200°C to 1300 °C.
Oxidizing flame - Salient features
Excess amount of oxygen
Inner cone will be less luminous and shorter
Outer envelope will be shorter and narrow
Applications areas mainly copper, brass and zinc
Inner Cone will have temperature 3300 °C Approximately
Outer envelope will have a temperature in the range of 2200°C to 2500 °C
Reducing or carburizing flame - Salient features
Excess amount of acetylene
This flame will have three sections i.e. Inner cone, Intermediate cone and Outer envelope
Inner cone will have temperature 2900 °C approximately
Intermediate Cone & Outer Envelope will have temperatures in the range of 1600°C to 1800 °C
Application areas - High Carbon steel and Cast iron
We will see the difference between Arc welding and Gas welding in our next post.
Reference
Engineering Practices by Mr. S. SUYAMBAZHAHAN
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