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Within the Heat Affected Zone (HAZ) in a fusion welding process, the work material undergoes

1. microstructural changes but does not melt
2. neither melting nor microstructural changes
3. both melting and microstructural changes after solidification
4. melting and retains the original microstructure after solidification

Correct answer: microstructural changes but does not melt

Solution

The Heat Affected Zone (HAZ) experiences changes in microstructure due to the heat from the welding process, but the material itself does not reach melting temperatures, allowing it to retain its solid form.

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