What are the constituents of solder alloy? Which property of solder makes it suitable for welding electrical wires?

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(N/A) Solder is an alloy composed of lead $(Pb)$ and tin $(Sn)$.
The primary property that makes solder suitable for welding electrical wires is its low melting point,which allows it to melt easily at relatively low temperatures without damaging the delicate electrical components.

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