Deposition of abrasion-resistant Ni-WC overlays using hot wire TIG welding

本工作探索了利用热线TIG熔覆Ni/WC耐磨堆焊层的工艺。人们普遍认为，镍/碳化钨覆盖层是性价比最好的材料，用于油砂开采和许多其他采矿作业，这些采矿作业曾受益于加拿大丰富的资源。这些覆盖层对熔融状态下的过热非常敏感，导致增强体溶解，严重损害耐磨性能。产生这些耐磨镀层的替代方法是使用一种名为等离子转移弧焊(PTAW)的技术，该技术涉及昂贵的资本设备、相对较低的生产率以及在异地和现场维修应用中缺乏灵活性。拟议的调查旨在探索一种比PTA更低的资本成本、更高的生产率潜力和同等或更好的耐磨性能的技术。挑战在于对工艺条件的理解，这是以前从未解决过的。这涉及广泛的实验、传热学、流体流动和热力学分析，以及金相和电子显微镜分析。这项工作的影响很大，有可能使中小企业能够将其提供的服务和产品扩大到一个非常有利可图的市场。这将使加拿大工业在采矿设备制造方面处于全球竞争地位。这个项目是在NSERC Engage补助金下开发的有前景的研究工作的扩展.

This work explores using the technology of Hot Wire TIG to deposit Ni/WC wear protection welded overlays. Ni/WC overlays are generally agreed to be the materials with the best cost-performance balance for oil sands extraction and many other mining operations used to benefit from Canada's abundant resources. These overlays are extremely sensitive to overheating in the molten state, resulting in dissolution of the reinforcement with serious detriment to wear performance. The alternatives to creating these wear resistant deposits is to use a technique called plasma transferred arc welding (PTAW) which involves expensive capital equipment, relatively low productivity, and lack of flexibility for out of position and field repair applications. The proposed investigation aims at exploring a technology of lower capital costs than PTA, with much higher potential for productivity, and with same or better wear performance. The challenge resides in understanding the process conditions, which have never been tackled before. This involves extensive experimentation, heat transfer, fluid flow, and thermodynamic analysis, as well as metallographic and electron microscopy analysis. The impact of this work is high, with the possibility of enabling small and medium enterprises to expand their offer of services and products into a very profitable market. This will position Canadian industries in a competitive position worldwide in the manufacturing of mining equipment. This project is and expansion of promising research work developed under an NSERC Engage grant.