Welding alloy is a type of metal that is used in welding and soldering. SOLDER is a type of alloy that is used to join two or more metals together by melting and flowing into the joint. It is composed of a combination of metals, such as lead, tin, zinc, and copper. SOLDER is often used in electrical and plumbing applications. Welding alloy is a stronger form of SOLDER and is used to join two or more metals together by melting and fusing them together. It is typically composed of a combination of metals, such as aluminum, copper, nickel, and chromium. Welding alloy is used in many industrial applications, such as automotive, aerospace, and construction.