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1755388 
Journal Article 
Development of EPRI P87 solid wire 
Siefert, JA; Sanders, JM; Tanzosh, JM; Newell, WF, Jr; Shingledecker, JP 
2010 
1 
Materials at High Temperatures
ISSN: 0960-3409 
27 
3 
243-252 
WOS:000283394500012 
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. 
creep strength enhanced ferritic steel; dissimilar metal welds; EPRI P87; ERNiCr-3; gas-tungsten arc welding; gas-metal arc welding; heat-affected zone; Larson-Miller parameter; procedure qualification record; shielded-metal arc welding; stress-rupture; ultimate tensile strength; weldability; yield strength