Due to the low hardness, poor abrasion resistance and insufficient toughness of the front bucket teeth and main cutter disc of the loader and excavator bucket, brittle fracture is easy to occur under the dual action of abrasive impact force and sliding friction.According to incomplete statistics, the annual consumption of bucket teeth and main cutter plate in China amounts to hundreds of tons.

Wear - resistant surfacing welding is a layer of wear - resistant alloy on the surface of carbon steel or low alloy steel parts.This can not only improve the wear resistance of the parts, meet the use requirements of the main cutter disc and bucket teeth, but also maintain the strength and toughness of the original parts and reduce the cost of the original matrix material.

A.Welding technology

1.The selection and selection of surfacing welding method and surfacing welding method should meet the following requirements: low dilution rate, high deposition rate and high efficiency;Workpiece size, shape complexity and batch size;Integrated low cost.Considering the concrete structure of bucket and the above factors, manual arc welding can be used.

2. The selection principle of surfacing materials and metals: one is to meet the performance requirements of parts when they work.Secondly, it has good weldability. It should be easy to weld and obtain the surfacing layer with good bonding and no defects with the substrate.Pay attention to the compatibility between the surfacing metal and the substrate, and fully estimate the influence of substrate dilution on the performance of the surfacing layer.When the carbon equivalent of matrix is high, preheating and buffer technology can be considered to prevent cracking.If this is not feasible, consider using a surfacing layer.Transition layer solution.Thirdly, considering the economy of surfacing welding, the alloy should be one of the alloys with the same performance, the simplest welding process and the processing cost.