Soldering is a method of appling a lower melting point material to join other materials. Common
solders are lead/tin mixtures (40:60) that have a melting point around 400F They can be heated in a number of ways, including bulk liquification, or by using a point source such as an electric
soldering iron or [braising torch]
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The dominant use of this process is for making a sound electrical joint between certain metals for use in electrical and electronic equipment.