冷镀锌涂料在轨道车辆制造中的应用研究

Study on the Application of Cold Galvanized Coating in Rail Vehicles

根据轨道车辆焊接技术要求,以冷镀锌涂料作为试验材料,利用(2.5+3.0)mm的耐候钢搭接接头进行了电阻点焊焊接工艺测试,确定了涂层焊接工艺,获得了外观良好的电阻点焊接头,且具有良好的拉伸力学性能,拉伸试验失效形式为脱扣,熔透率和熔核直径均符合标准要求。通过中性盐雾测试表明:可焊接涂层的防腐性远远超出了车辆制造使用的环氧预涂底漆48 h的质量要求。

According to the technical requirements of railway vehicle welding, cold galvanized coatings as experimental materials for resistance spot welding process test using （2.5＋3.0） mm weathering steel joint. The coating welding can be determined, the resistance spot welding joint with good appearance, and has good mechanical properties. The failure form of tensile test is tripping. The penetration rate and nugget diameter meet the standard requirement. In general neutral salt spray test, the corrosion resistance of welding coating is much higher than the quality requirement of epoxy precoated primer used in vehicle manufacture for 48 h.