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Piston Ring Microwelding Phenomenon and Methods of Prevention
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English
Abstract
This paper will discuss metallurgical failure analysis of microwelded iron piston rings and aluminum pistons in internal combustion engines. “Microwelding” is defined as adherence of sporadic particles of aluminum from the piston to the bottom side of the piston ring. The paper will describe the high output water-cooled two-stroke engine accelerated test which reproduces the microwelding phenomenon in 30 minutes. SEM and EDS analyses have been used in the identification of the mechanism of this surface damage. Evidence of extreme temperatures during pre-ignition and normal operating conditions was obtained by studying hardness distributions through the piston cross section. As a potential solution, decreasing temperature through use of a thermal barrier coating was investigated. Also, test results of piston ring coatings, including molybdenum and tungsten disulfide, electroplated chromium, PVD titanium and chromium nitride, and fluoroplastic materials were compared.
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Citation
Shuster, M., Mahler, F., Macy, D., Frame, R. et al., "Piston Ring Microwelding Phenomenon and Methods of Prevention," SAE Technical Paper 960745, 1996, https://doi.org/10.4271/960745.Also In
References
- Ting, L.L. Yen, C.M. Terner, L.L. “Friction and Scuffing Resistance Characteristics of Piston Materials as Investigated by a Reciprocating Test Rig,” SAE Paper No. 951042 1995
- Wong, T.Y. Scott, C.G. Ripple, D.E. “Diesel Engine Scuffing: A Preliminary Investigation,” SAE Paper No. 930687 1993
- Dowson, D. Piston Assemblies: Background and Lubrication Analysis,” Engine Tribology 213 240 Elsevier Publishing New York, New York 1993
- Sagawa, J. Ikeda, Y. Owki, T. “MoS 2 Coated Piston Ring to Prevent Pistons' Aluminum Sticking,” SAE Paper No. 911281 1991
- American Society for Metals “Welding, Brazing and Soldering,” ASM Metals Handbook Ninth 6 1152 ASM Metals Park, Ohio 1983