welds are made up of the base material (the metal you had before welding) and a filler material (what you see in addition to the base material) the most common materials welded are steel, aluminum, and stainless steel, and then alloys of each. The filler material can be an exact match to the base, but is usually a compatible alloy containing some other metal to aid in welding i.e. carbon, magnesium, etc
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