Which solder composition is most suitable for joining delicate electronic components requiring a low melting point and reliable electrical connections?
Tin-lead solder with 60% tin and 40% lead
Delicate electronic parts are damaged by heat, so the solder must melt at a low temperature and wet the joint cleanly for a sound electrical connection.
The 60% tin, 40% lead solder melts at about 183-188°C, flows freely and forms strong, reliable electrical joints, which is why it is the standard electronics solder.
The copper-rich and 70% lead alloys melt much higher, and the silver alloy here is aimed at other duties, so they risk overheating the components.
Hence, the answer is tin-lead solder with 60% tin and 40% lead.
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