The primary alloy for plumbing and low-temp welding (soldering) is solder, typically a tin-lead alloy (like 63% tin, 37% lead) for its low melting point, but modern plumbing often uses lead-free solder (tin-silver-copper) or brazing alloys, while actual high-heat welding uses various filler alloys like steel, bronze, or aluminum, depending on the base metal.
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