【作者】 王占朝；

【导师】 杨育林；

【作者基本信息】 燕山大学 ， 机械设计及理论， 2009， 硕士

【摘要】 近年来,耐磨药芯焊丝在国内外堆焊修复领域的使用越来越广泛,药芯焊丝的质量和修复层的耐磨性能决定了堆焊零部件的使用寿命。因此,对耐磨药芯焊丝的生产工艺和耐磨性评价进行研究具有重大的实际意义。本课题在经过多次的焊接试验基础上,对药芯焊丝的配方要求提出了飞溅小、造气少和成型好等一系列的建议,为药芯焊丝配方设计的改进提供了依据。本课题采用的生产工艺是生产有缝药芯焊丝中的轧拔法。在研究药芯焊丝成型过程的基础上,采用了包括带钢边缘弯曲法与圆周组合弯曲法在内的精密带钢冷弯成型方法,设计出一套使药芯焊丝的断口截面为O型搭接的辊型,使有缝药芯焊丝在生产中的掉粉情况明显改善,提高了药芯焊丝的质量。针对目前国内耐磨实验对真实工况模拟不够的情况,本文提出了两级耐磨实验法思想,设计了能够满足试件焊接要求的焊接平台和两种堆焊试件即平板试件和回转试件。经过多次的焊接试验调试出最佳的焊接参数。同时,建立了测试药芯焊丝堆焊层耐磨性的耐磨实验平台。本课题中的实验采用Q235钢和两种自制的药芯焊丝作对比实验,将3种试件在耐磨试验平台上进行耐磨实验。通过测量每个试件失重,分析扫描电镜和金相组织的照片,从宏观和微观角度比较了试件的耐磨性,选出最优的试件。研究表明本课题所建立的耐磨性评价试验平台可以快速、合理地评价出各种药芯焊丝的耐磨性能。更多还原

【Abstract】 Recently, the wear-resistant flux-cored wire has been applied more widely in the surfacing field. The quality and wear resistance of the flux-cored wire affect the layer repair results. Therefore, the research and development of the production process and evaluation of the wear resistance of flux-cored wire are of great practical significance.By the orthogonal test design,the formula of flux-cored wire was adjusted. It made the wear resistant of flux-cored wire reach the high level. Meanwhile, the welding process was simplified. The welding quality of flux-cored wire without the gas protection also met the requirement. The production process that used in this work was the rolling and drawing method for the seam-flux-cored wire. On the basis of the forming process of, many pass design methods were integrated including strip edge bending method and circumference combination bending method, a sets of rolls that can made the fracture cross-section of flux-cored wire with a lap-O-Roll were designed. The situation that powder out of flux-cored wire in production with the lap seam-flux-cored was better than with docking O-type one.At present, wear experiment that simulated the real situation was not enough. According to this situation, two-level wear resistance test method was proposed, two welding samples were used in this work, one was flat-panel sample and another was rotary sample. A welding platform was designed to meet the requirements of the welding samples. After several welding tests, the best welding parameters were debugged. The experimental platform that tests the wear resistance of the flux-cored wire welding was established. Steel Q235 and two types of flux-cored wire made by ourselves were used for comparison test. Samples in the wear resistance test platform for wear resistance experiments were prepared. By measuring each sample’s weight loss, the pictures of the SEM and microstructure were analyzed, and the wear resistance of samples was compared, in which the optimum sample was select. Meanwhile, the establishment of the wear resistance experimental platform in this work can quickly and reasonably evaluate the wear resistance properties of the flux-cored wire.更多还原