High Pressure Soldering Fittings

Soldering is defined as a thermal joining process to cohesively bond predominantly metallic materials. Unlike brazing, soldering does not melt the original material, Soldering creates a permanent join between two or more components, using solder and flux, and a heating iron.

During the soldering process applied heat causes the solder to melt (wetting) and to bond the items to be joined. Most metals (including copper and its alloys, nickel and ferrous metals) can be soldered. The distinction between soldering and brazing is based on the melting temperature of the solder. A temperature of 450° C is usually used as a demarcation between soldering and brazing. Use of temperatures above 450° C is regarded as brazing.

Brazing

Brazed joints are made with low melting point, conductive silver solders and associated flux. Work with a soft flame, avoiding hard, point shaped, flames and overheating. The surfaces to be joined should be roughened either mechanically or chemically. The brazing gap should be 0,1 mm, the overlap minimum is 2 mm. If you need to join a larger gap (e.g 0,5 – 1,5 mm) we recommend the use of a gap soldering agent, to give strong and stable joins. For Brazing use silver solder with 45 – 56 % silver. Only use cadmium free silver solders in food processing applications. Remove the emerging tarnishing colour by pickling or brushing. Tempering colours can be avoided by adequate wetting and skilful application of heat.