Brazing method for high strength wear resistant copper alloy

Oxygen-free, highly conductive and deoxidized copper, easy to be brazed by furnace brazing or torch method. At high temperatures, aerobic copper is sensitive to oxygen migration or hydrogen embrittlement, or both, and should therefore be brazed in a furnace in an inert gas, nitrogen, or vacuum atmosphere. Flame brazing shall use neutral or small oxide flame, wear-resistant copper alloy copper phosphorus or silver copper phosphorus solder with self-brazing agent on copper. In large assemblies, however, the brazing agent is useful, and the extended soldering time of large assemblies may cause additional oxidation. Due to the risk of corrosion, the brazing joints of phosphorous filler metals used should not be exposed to high temperature water and sulfurous atmosphere for long periods.

If the use of copper and zinc solder, pay attention to the operation can not overheat, zinc evaporation in the joint will cause sand holes, when using flame brazing, oxide flame will reduce the evaporation of zinc, you can use AWS elements FB3-D, FB3-1 and FB3-J. RBCuZn solder corrosion resistance is not as good as copper.

Special copper alloys containing small amounts of silver, lead, tellurium, selenium or sulfur (generally not more than 1% by mass) are easily brazed by the self-brazing agent filler metal BCuP. Wettability can be improved if flux is used. The high strength copper plated alloy die material (beryllium 2% by mass fraction) can be needle welded in the furnace and simultaneously treated with solution at 788 ° C, solidified at slightly lower temperatures (760 ° C), and then hardened in water and aged at 343~361 ° C. Silver-copper material BAg72Cu is generally used in conjunction with AWS FB3-A and FB3-E brazing agents.

Another method of rapid heating (requiring less than 1min) is to braze the solution anneal material below the solution anneal temperature. Aging induction brazing without reannealing after brazing can achieve sufficient rapid heating. Zirconium copper and chromium-copper were annealed at 482℃, followed by solution annealing and cold processing at 899-1010℃. Brazing with silver - containing solder and fluoride - containing brazing agent should be carried out as far as possible after solution annealing and cold working and before age hardening. After this process, the heat treatment characteristics of the base metal are below normal.