目前,钎焊工艺在铸件的补焊中已得到了广泛的应用。为了获得规定条件下给定的性能,有时,既使将工件预热到600～650℃,也不能获得成功,特别是重量超过15吨的铸件。为了解决这个问题,研制了ПКК-69型铜镍基专用焊条,其焊芯成分(％)为:Cu27.0～32.0,Si1.5～1.6,Mn0.8～1.0,余为镍。药皮成分(％)为:银色石墨25、莹石30、碳化硅40、铝粉5、水玻璃60。在ДМК-0.25炉中熔炼焊条金属,然后铸成直径为6～20毫米的芯棒,焊条以浸渍法制造。ПКК-69焊条适用于中、大型和特大型 At present, the brazing process has been widely used in the repair of castings. In order to achieve the given performance under the given conditions, it is sometimes not possible to achieve success even if the workpieces are preheated to 600-650 ° C, especially castings weighing more than 15 tons. In order to solve this problem, developed a special nickel-based copper  П-69 type, the core composition (%): Cu27.0 ~ 32.0, Si1.5 ~ 1.6, Mn0.8 ~ 1.0, the rest is nickel. Coating composition (%): silver graphite 25, fluorite 30, silicon carbide 40, aluminum powder 5, water glass 60. The electrode metal is melted in a ДМК-0.25 furnace and then cast into a mandrel 6 to 20 mm in diameter. The electrode is made by impregnation. ПКК-69 electrode for medium, large and extra large