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Soldering with a non ferrous alloy is not welding-unless you are joining the same alloy you are soldering with. Soldering uses a different metal (usually softer) to join metals. "Brazing" refers to joining with brass. Brazing is also hard-soldering. Silver (hard) soldering uses a silver/copper alloy at high heat.
Silver-bearing (containing) solder uses a very small amount of silver in a lead/tin mixture to join metals. It is a low heat, or "soft" solder. Lead soldering is soft soldering.
Welding generally refers to joining steel to steel, using molten steel, but other metals can be welded.
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