What elemental composition is typical for standard soldering alloys__________________?
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Answer: A. tin, lead and small percentage of antimony
Explanation
Standard soft solders are primarily binary alloys of tin and lead containing small percentages of antimony. Adding antimony enhances the mechanical strength and creep resistance of the solid soldered joint. This specific metallic composition provides a low melting point suitable for electronic and plumbing connections. Solder alloys melt easily at temperatures well below the melting points of the metals being joined together. The eutectic composition of tin lead solder melts sharply at approximately one hundred eighty three degrees Celsius. Antimony additions must be carefully controlled to prevent unwanted brittleness in the hardened solder alloy.
Binary solders containing only tin and lead lack the specific strengthening benefits provided by antimony additives. Alloys containing silver are categorized as hard solders or brazing filler metals rather than standard soft solder. Tin and copper combinations are typically used for lead free plumbing solders rather than antimony formulations.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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