Ⅱ号喷油泵凸轮轴多数为中碳钢经淬火热处理制造的。有的产品质量欠佳,使用中磨损很快,常产生如图1所示部位的磨损。一般,当凸轮一侧磨损时,可以将凸轮轴反转使用;当局部磨损超过0.5毫米时,反转使用会影响供油规律,必须修复后再用。几年来我们采用堆焊法修复凸轮,收到较好的效果。堆焊前,先用浸过冷水的湿布包上凸轮轴,只露出施焊部位。焊接规范是:电源用交、直流电焊机均可, Most of the injection pump camshafts are made of medium carbon steel by quenching and heat treatment. Some poor quality products, the use of wear quickly, often produce the parts shown in Figure 1 wear. In general, when one side of the cam is worn, the camshaft can be reversely used. When the local wear exceeds 0.5 mm, the reverse use will affect the oil supply rule and must be repaired before use. Over the past few years we use surfacing repair cam, received good results. Before welding, first with a wet cloth soaked in cold water on the camshaft, only exposed welding site. Welding specifications are: power supply, DC welding machine can be,