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依据铸钢件钎焊焊补的特性与要求,研究开发了适于ZG25焊补的银基钎焊材料,并对其焊接工艺在铁路道岔的间隔铁和限位器铸钢件上进行了系统研究。结果表明,材质Ag(5%)-Cu(6%)-Sb(3%)和锡(Sn)余量为最佳填补材料,其熔点低,铺展性和填缝能力最好,接头的抗剪强度最高,焊缝表面颜色与母材基本无色差,接头部位无变形,该部件经多次变载荷使用,无脱落现象,提高了铸钢件的表面质量和使用性能。
According to the characteristics and requirements of brazing welding of steel castings, a silver-based brazing material suitable for welding of ZG25 was researched and developed, and its welding process was carried out on the system of the interval iron and the stopper steel castings of railway turnout the study. The results showed that the best filler was Ag (5%) - Cu (6%) - Sb (3%) and tin (Sn), with the lowest melting point and the best spreadability and sealability. Shear strength of the highest, the weld surface color and the basic color of the base material without color, no deformation of the joint parts, the components after repeated variable load, no shedding phenomenon, improve the surface quality of steel castings and performance.