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Development of EPRI P87 solid wire

机译：开发EPRI P87实心线

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Dissimilar metal welds (DMW's) between ferritic and austenitic materials at elevated temperatures have concerned boiler manufacturers and operators for decades because of the proven potential for premature failure. The industry has desired an improved filler metal that would minimize or eliminate DMW failures and, with the current trend toward higher boiler steam pressures and temperatures, have suitable creep strength for joining higher strength materials such as Grade 91 steels After years of research, the Electric Power Research Institute (EPRI) concluded the development and commercialization of a nickel-based filler metal, EPRI P87, for application in shielded metal arc welding (SMAW). This work describes the subsequent development of an EPRI P87 solid wire welding product for application in gas tungsten arc and gas metal arc welding (GTAW and GMAW) processes, and the initial research into the performance of DMWs produced with the new solid wire P87 product. A 135 kg heat of solid wire was produced and tested using various welding processes and evaluation methods to ensure that the material would meet required weldability and design specifications. Welding methods included GMAW-P, GTAW and hot-wire GTAW in welds up to 50 mm in thickness. The weld joint tested was a dissimilar metal weld of grade 91 to 347H, which was assessed using microstructure evaluation, creep testing, hot tensile testing, circular patch, and edge build-up investigations to examine hot-cracking susceptibility. This paper summarizes the research completed to date on the EPRI 87 filler wire which supports the acceptability of this material for its intended use in high-temperature power generation applications.
机译：高温下，铁素体和奥氏体材料之间的异种金属焊缝（DMW）引起锅炉制造商和运营商数十年的关注，因为它们已被证明具有过早失效的潜力。业界希望得到一种改进的填充金属，以最大程度地减少或消除DMW失效，并且随着当前锅炉蒸汽压力和温度升高的趋势，具有合适的蠕变强度，可用于连接更高强度的材料，例如91级钢。经过多年的研究，电气电力研究所（EPRI）结束了用于屏蔽金属电弧焊（SMAW）的镍基填充金属EPRI P87的开发和商业化。这项工作描述了随后在气体钨极电弧焊和气体金属电弧焊（GTAW和GMAW）工艺中应用的EPRI P87实心焊丝产品的开发，以及对使用新型实心焊丝P87产品生产的DMW的性能的初步研究。产生了135公斤的实心焊丝，并使用各种焊接工艺和评估方法进行了测试，以确保材料符合要求的可焊性和设计规格。焊接方法包括GMAW-P，GTAW和热焊GTAW，其焊接厚度可达50毫米。所测试的焊缝为91至347H级的异种金属焊缝，使用微结构评估，蠕变测试，热拉伸测试，圆形斑块和边缘堆积研究进行评估，以检查热裂敏感性。本文总结了迄今为止在EPRI 87填充焊丝上完成的研究，该研究支持该材料在高温发电应用中的预期用途可接受性。

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