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Evaluation on the Corrosion and Wear Resistance of Welding Zone Welded with Plasma Transferred Arc Welding Method

机译：等离子体转移电弧焊接法焊接焊接区腐蚀与耐磨性评价

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摘要

There are many welding methods which have been currently performed to prolong the life time of exhaust valve of marine engine from an economic point of view. In this study, one of these welding methods, plasma transferred arc (PTA) welding was performed at the base metal of Nimonic 80A which would be used as the material of exhaust valve with three kinds of filler metals such as Stellite 6, Inconel 625 and Inconel 718. The mechanical and corrosion characteristics were investigated with electrochemical and wear loss test methods. The Nimonic 80A as the base metal had a better corrosion resistance than those of the weld metals welded with three types of the filler metals. However, after post weld heat treatment, all these weld metals mentioned above exhibited better corrosion resistance compared to the base metal, shifting the corrosion potential to the noble direction, and pitting corrosion was more or less observed at the surface of Nimonic 80A after post weld heat treatment. In particular, Inconel 625 showed the best corrosion resistance among the filler metals after heat treatment. The wear ratio of Stellite 6 showed the lowest value due to its highest hardness among the filler metals, however, its ratio by cavitation test exhibited the highest value. It is considered that increasing of embrittlement with increasing the hardness was resulted in increasing the wear loss by cavitation test.
机译：目前已经进行了许多焊接方法，以延长海洋发动机排气阀的寿命从经济的观点。在该研究中，这些焊接方法中的一种等离子体转移的弧（PTA）焊接在尼苏松80A的基础金属上进行，其将用作排气阀的材料，其中三种填充金属如粗糙6，Inconel 625和625 Inconel 718.用电化学和磨损试验方法研究了机械和腐蚀特性。作为基础金属的弯曲80a具有比用三种类型的填充金属焊接的焊接金属的耐腐蚀性更好。然而，在焊接后热处理后，与基础金属相比，上述所有这些焊接金属表现出更好的耐腐蚀性，使腐蚀电位移位到惰性方向，并且在焊缝后尼芯部80A的表面观察到凹陷腐蚀等待观察到的蚀腐蚀热处理。特别地，Inconel 625在热处理后填充金属之间的最佳耐腐蚀性。钝化物6的磨损比表明，由于填充金属中的最高硬度，但由于其通过空化测试的比率表现出最高值。考虑到增加硬度的脆化的增加导致通过空化试验增加磨损损失。

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