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履带式工程机械以其特有的结构特点在矿山、水利工程、道路工程发挥着巨 大的经济效益。但由于其履带式行走系统在施工过程中，其引导轮与履带筋、支重轮与 履带筋、托带轮与履带筋之间不可避免地带入硬或软的的沙砾，因此始终处于三体磨料 磨损状态。而其履带板与矿石、砂土之间处于硬磨料或松散磨料的两体磨料磨损状态。 因此其行走系统磨损严重，最终导致磨损失效。对其行走系统进行堆焊修复无疑具有 重要意义。本文利用ＭＬＳ－２３型湿砂橡胶轮式磨损试验机、扫描电镜和透射电镜对所 开发的用于履带式工程机械行走机构堆焊修复用ＣＯ２气保护药芯焊丝的熔敷金属磨粒 磨损性能进行了试验研究。结果表明，１、２号焊丝熔敷金属的磨损主要是微观切削，而 ３、４号焊丝熔敷金属的磨损则是多次塑变磨损机理占据主导地位。
Caterpillar construction machinery with its unique structural features in mines, water conservancy projects, road works play a huge economic benefits. However, due to its crawler walking system in the construction process, the guide wheels and caterpillar tendons, roller and caterpillar tendons, between the idler pulley and the caterpillar tendons into hard or soft gravel, it is always in the three body Abrasive wear status. And its track shoes and ore, sand between the hard abrasive or loose abrasive two-body abrasive wear state. As a result, the running system is severely worn, eventually resulting in wear failure. It is undoubtedly of great significance to surfacing and repairing its walking system. In this paper, MLS-23 type wet sand rubber wheeled abrasion testing machine, scanning electron microscope and transmission electron microscopy were developed for crawler construction machinery running gear surfacing repair with CO2 gas shielded flux cored wire wear abrasive wear performance Conducted a pilot study. The results show that the wear of the deposited metal of the wire No.1 and No.2 is mainly micro - cutting, while the wear of the deposited metal of the wire No.3 and No.4 is dominated by the mechanism of multiple plastic deformation and wear.