| PDC自动化高频感应钎焊强度的影响因素 |
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| 引用本文： | 戴勇波.PDC自动化高频感应钎焊强度的影响因素[J].煤田地质与勘探,2019,47(6):218-224. |
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| 作者姓名： | 戴勇波 |
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| 基金项目： | 中煤科工集团西安研究院科技创新基金项目（2018XAYMS007） |
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| 摘 要： | 随着制造业不断向自动化、智能化方向发展，研究PDC钻头钎焊自动化是钻头生产技术的重点发展方向之一。为分析焊接强度对PDC自动化钎焊的影响及适应情况，利用特制的工装及试验条件，以PDC片和合金支柱为基体材料，开展了PDC高频感应焊接试验；并结合剪切强度和断面形态，分析了钎料钎剂、表面预处理、焊接方式、保温方式及感应加热对焊接强度的影响，并提出了适应PDC自动化钎焊的钎焊工艺方法。结果表明:应根据实际情况选取合适的银基钎料及专用焊膏；母材表面氧化层对焊接强度的影响较大；采用旋转式辅助焊接方式有助于钎料的铺展及排气排渣，能有效提高感应钎焊的强度；保温方式对PDC感应焊接强度的影响不大；应减小感应加热的集肤效应造成的边缘钎料熔蚀和中心温度低钎料未完全熔融对工件焊接强度的影响。研究结果为实现PDC自动化感应焊接提供了可行性方案，并对实现PDC钻头自动化钎焊提供了基础依据。
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| 关 键 词： | PDC钻头 钎焊自动化 高频感应钎焊 钎焊强度 影响因素 |
| 收稿时间： | 2019-05-10 |
Analysis of factors affecting the automatic high-frequency induction brazing strength of PDC |
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| Abstract: | With the development of automation and intelligentization in manufacturing industry, the research on PDC bit brazing automation is one of the key development directions of bit production technology. In order to study the influencing factors and adaptation methods of welding strength in PDC automatic brazing process, PDC high frequency induction welding and shear strength comparison test were carried out by using PDC and alloy pillar as the base material through special tooling and test conditions. Combined with the shear strength experiment and the morphology of brazing surface of PDC high-frequency induction brazing, the effect of brazing filler alloys, fluxes, surface pretreatment, welding method, heat preservation and induction heating on welding strength was analyzed, and a brazing process suitable for PDC automatic brazing was proposed. The results showed that the suitable silver brazing filler alloys and special solder paste should be selected according to the actual situation; the surface oxide layer of the base metal has a great influence on the brazing strength; the rotary auxiliary welding method is helpful for the spreading of the solder and the exhaust slag, at the same time, this method can effectively improve the strength of induction brazing; the heat preservation has little effect on induction brazing strength of PDC; the influence of skin effect on the edge solder melt while the center solder not melt because of the low temperature should be reduced, which would affect the strength of the work piece.The research results provide a feasible solution for the realization of PDC automatic induction welding, and provide a basis for the realization of PDC bit automatic brazing. |
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