Brazing copper and its alloys to be used before mechanical cleaning or sanding way to clear the surface of the oxide , a chemical clean way to remove grease and other contaminants . Copper and its alloys can be used iron , crest , flame, induction , resistance, and other methods of heating furnace brazing. In the oxygen-containing copper furnace brazing can not use hydrogen atmosphere , it should avoid the use of flame brazing large assemblies to avoid hydrogen embrittlement . Brass furnace brazing , to avoid the evaporation of zinc , preferably the surface of the brass plating first , and then brazing. Prolonged heating of the copper alloy lead is likely to precipitate lead , there may be defects in the connector . Aluminum bronze brazing of aluminum in order to prevent the diffusion of the silver solder , Stainless Steel Welding Rodheating time as short as possible , the surface of copper or aluminum bronze , nickel, etc. I belong . Bronze soldering , the best Copper Brazing Alloys temperature below 300 ℃ solder to avoid aging softened. Bronze brazing , the solidus temperature should be selected higher than the quenching temperature (780 ~ C) solder , brazing aging treatment after quenching . For prone to cracking from silicon bronze , phosphor bronze and copper -nickel alloys, be sure to avoid thermal stress cattle production , rapid heating methods should not be used