Which method joins metals primarily by applying mechanical force at elevated temperature without filler material?
Pressure welding
The question asks us to identify the method that joins metals primarily by applying mechanical force at an elevated temperature without using filler material. Let's examine the options one by one:
- Fusion welding: This process involves melting the base metals. Filler materials are often used to help join the metals as they cool and solidify. Thus, fusion welding is not the correct answer.
- Soldering: This process uses a filler material (solder) which melts at a low temperature to join metals. This does not involve significant mechanical force or high temperatures, so soldering is not the correct answer.
- Brazing: Similar to soldering, brazing uses a filler material that melts at a higher temperature than solder but still lower than the melting point of the base metals. It does not primarily rely on mechanical force, so brazing is also not correct.
- Pressure welding: This method, also known as forge welding or solid-phase welding, involves applying mechanical force to join metals at elevated temperatures. It does not use any filler material. The metals are heated to an appropriate temperature and then pressed or hammered together, forming a bond. Therefore, the correct answer is pressure welding.
Based on the analysis above, the correct answer is Pressure welding. This method uniquely fits the description as it utilizes mechanical force and elevated temperatures without requiring a filler material.
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