GATE ME 2016 Set 1 — Question 31
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Manufacturing Processes → Joining → Brazing, Soldering & Adhesives
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Question
Under optimal conditions of the process the temperatures experienced by a copper work piece in fusion welding, brazing and soldering are such that
Correct answer
(D) T_(welding) T_(brazing) T_(soldering)
Solution
The three processes, fusion welding, brazing, and soldering, are all joining processes that involve heating materials. The primary difference among them, especially in the context of temperature, lies in whether the base metal melts and the melting point of the filler material (if used).
(above base metal melting point) > (above , below base metal melting point) > (below ).So, the correct order is .The final answer is
1.Fusion Welding: In fusion welding (e.g., arc welding), the base metal itself is melted to form a joint. For copper, the melting point is approximately . Therefore, the temperatures involved in welding are above the melting point of the base metal.
2.Brazing: In brazing, a filler metal is melted and distributed between two or more close-fitting parts by capillary action. The filler metal has a melting point above but below the melting point of the base metal. The base metal does not melt during brazing.
3.Soldering: In soldering, similar to brazing, a filler metal (solder) is melted to join parts. However, the filler metal used in soldering has a melting point below and also below the melting point of the base metal. The base metal does not melt during soldering.
Based on these definitions, the temperature hierarchy is:(above base metal melting point) > (above , below base metal melting point) > (below ).So, the correct order is .The final answer is
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