15 Silver Brazing Rod Melting Point

Brazing is a metal joining process in which two or more metal items are joined together by melting and flowing a filler metal into the joint the filler metal having a lower melting point than the adjoining metal.
15 silver brazing rod melting point. Sil fos 18 has the highest silver content in the sil fos family but it has the lowest melting point. Silver brazing is a joining process whereby a non ferrous filler metal alloy is heated to melting temperature above 800 f and distributed between two or more close fitting parts by capillary attraction. Silver brazing filler metals have low melting point good wettability and filling performances. The most common rods used for typical hvac brazing are 0 5 and 15 with several other levels mixed in there.
Silver brazing frequently called hard soldering or silver soldering is a low temperature brazing process with rods having melting points ranging from 1145 to 1650ºf 618 to 899ºc. This composition allows it to flow more quickly and deeply. This is considerably lower than that of the copper alloy brazing filler metals. Slight tendency to liquate.
Low zinc content minimizes issues with prolonged or repeated heating. Lowest melting point cadmium free silver alloy. At its liquidus temperature the. The percentage is the percentage of silver content in the rod.
Soldering differs from brazing in that it takes place at temperatures below 450 c although both processes occur below the melting point of the metals being joined. Brazing filler metals have a melting point above 450 c but below the melting point of the metals being joined. It is a eutectic alloy having the same solidus and liquidus temperatures. They also have features of high mechanical strength fine plasticity electrical conductivity and corrosion resistance.
The only real reason to use lower silver levels is the cost and the difference can have many techs and owners wondering what the difference is. Used in food equipment. Does anyone know of a chart that has all the melting points of solder say 50 50 or the melting point of the silver solders that we use in our field the reason i m posting is because out lab manual asked for specific temp s.