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Soft soldering is characterized by having a melting point of the filler metal below approximately 400 °C (752 °F), [9] whereas silver soldering and brazing use higher temperatures, typically requiring a flame or carbon arc torch to achieve the melting of the filler. Soft solder filler metals are typically alloys (often containing lead) that ...
Soft soldering uses a filler that melts at a lower temperature than the workpiece, often a lead-tin solder alloy. Brazing and hard soldering use a higher temperature filler that melts at a temperature which may approach that of the base metal, and which may form a eutectic alloy with the base metal.
Solder used in making electrical connections also needs to have favorable electrical characteristics. Soft solder typically has a melting point range of 90 to 450 °C (190 to 840 °F; 360 to 720 K), [3] and is commonly used in electronics, plumbing, and sheet metal work.
Soldering copper pipes using a propane torch and a lead-free solder. Solder is a metallic material that is used to connect metal workpieces. The choice of specific solder alloys depends on their melting point, chemical reactivity, mechanical properties, toxicity, and other properties.
General purpose filler metal for aluminium soldering/brazing with a torch. Grayish-white color. 98: 2: Al 73 Cu 20 Si 5 Ni 2 Bi 0.01 Be 0.01 Sr 0.01: Al–Cu–Si 515/535 [5] – For brazing aluminium. Traces of bismuth and beryllium disrupt the surface aluminium oxide. Strontium refines grain structure of the brazing alloy, improving ductility ...
For successful soldering and brazing, the oxide layer has to be removed from both the surfaces of the materials and the surface of the filler metal preform; the exposed surfaces also have to be protected against oxidation during heating. Flux-coated preforms can also be used to eliminate flux residue entirely from the soldering process. [14]
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