Development of EPRI P87 solid wire
Development of EPRI P87 solid wire
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EPRI P87实心焊丝的开发
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
J. Shingledecker
中科院分区：
文献类型：
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作者：
J. Siefert;J. Sanders;J. Tanzosh;W. F. Newell;J. Shingledecker
铁素体和奥氏体材料在高温下的异种金属焊接(DMW‘s)几十年来一直困扰着锅炉制造商和操作员，因为已证实存在过早失效的可能性。经过多年的研究，电力研究所(EPRI)总结出了一种镍基填充金属EPRI P87的开发和商业化，用于保护金属弧焊(SMAW)。本工作介绍了EPRI P87实心焊丝焊接产品的后续开发，以及用新的实心焊丝P87产品生产的熔化极气体保护焊(GTAW和GMAW)工艺的初步研究。采用各种焊接工艺和评估方法生产并测试了135公斤热的实心焊丝，以确保该材料满足要求的焊接性和设计规范。焊接方法包括GMAW-P、GTAW和50 mm以下焊缝的热丝GTAW。试验焊接接头为91~347H级的异种金属焊缝，通过显微组织评定、蠕变试验、热拉伸试验、环形补丁和边缘建立试验来检测热裂纹敏感性。本文总结了迄今为止对EPRI 87填充丝的研究，支持了该材料在高温发电应用中的可接受性。
Abstract 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 50mm 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.