- Fusion in welding refers to the process where the base metal and filler material (if used) melt and combine to form a strong joint when cooled.
- It ensures a metallurgical bond between the materials being welded.
- Fusion Welding
- Involves melting of base metals.
- Example: Arc welding, gas welding.
- Non-Fusion Welding
- No melting of base metals, only filler material or pressure is used.
- Example: Soldering, brazing.
- Fusion Zone– The region in the weld where the base metal has melted and solidified.
- Determines the strength and quality of the weld.
- Heat-Affected Zone (HAZ) – The area adjacent to the fusion zone where the metal undergoes structural changes due to heat but does not melt.
