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http://dx.doi.org/10.5574/KSOE.2016.30.4.334

Evaluation of Characteristics of Welding Zones Welded with Inconel 718 Filler Metal to Piston Crown Forged Material  

Lee, Sung-Yul (Department of Marine Equipment Engineering, Korea Maritime and Ocean University)
Moon, Kyung-Man (Department of Marine Equipment Engineering, Korea Maritime and Ocean University)
Jeong, Jae-Hyun (Department of Mechanical & Energy System Engineering, Korea Maritime and Ocean University)
Lee, Myeong-Hoon (Department of Marine System Engineering, Korea Maritime and Ocean University)
Baek, Tae-Sil (Department of steel industry, Pohang College)
Publication Information
Journal of Ocean Engineering and Technology / v.30, no.4, 2016 , pp. 334-340 More about this Journal
Abstract
The combustion chamber of a diesel engine is often exposed to a more serious wear and corrosion environment than other parts of the engine because its temperature increases as a result of using heavy oil of low quality. Therefore, repair and built-up welding methods must be performed on worn or corroded parts of the piston crown, exhaust valve, etc. from an economical point of view. In this study, Inconel 718 filler metal was used in repair welding on the groove of a forged steel specimen for a piston crown, along with built-up welding on the surface of another forged steel specimen. Then, the corrosion characteristics of the weld metal zone for the repair welding and the deposited metal zone for the built-up welding were investigated using electrochemical methods in a 35% H2SO4 solution. The deposited metal zone indicated better corrosion resistance than the weld metal zone, showing a nobler corrosion potential, higher impedance, and smaller corrosion current density. It is considered that metal elements with good corrosion resistance were generally included in the filler metal, and these elements were also greatly involved in the deposited meta by built-up welding, whereas the weld metal consisted of metal elements mixed with both the filler metal and base metal elements because of the molten pool produced by the repair welding. Finally, it is considered that the hardness of the weld metal was increased by the repair welding, whereas the built-up welding improved the corrosion resistance of the deposited metal.
Keywords
Repair Repair welding; Built-up welding; Deposited metal; Weld metal; Inconel 718 filler metal inconel; Piston crown; Corrosion resistance;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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