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Under optimal conditions of the process, the temperatures experienced by a copper workpiece in fusion welding, brazing and soldering are such that

1. T_welding > T_soldering > T_brazing
2. T_soldering > T_welding > T_brazing
3. T_brazing > T_welding > T_soldering
4. T_welding > T_brazing > T_soldering

Correct answer: T_welding > T_brazing > T_soldering

Solution

In fusion welding, the base metal itself melts, so the temperature is highest. Brazing uses a filler metal with melting point above soldering but below the base metal, while soldering uses the lowest-melting filler metal.

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