Development of Wear Resistance Layr Using Resistance Cladding Method

Research Project

Project/Area Number	07650847
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Material processing/treatments
Research Institution	Kyushu Institute of Technology
Principal Investigator	KATOH Mitsuaki (1996) Faculty of Engineering, Professor, 工学部, 教授 (90039107) 西尾一政 (1995) 九州工業大学, 工学部・物質工学科, 助教授 (50039145)
Co-Investigator(Kenkyū-buntansha)	NISHIO Kazumasa Faculty of Engineering, Associate Professor (50039145) 加藤光昭九州工業大学, 工学部・物質工学科, 教授 (90039107)
Project Period (FY)	1995 – 1996
Project Status	Completed (Fiscal Year 1996)
Budget Amount *help	¥1,900,000 (Direct Cost: ¥1,900,000) Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000) Fiscal Year 1995: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywords	Surface modification / Cladding / Wear resistance / Resistance cladding method
Research Abstract	Hard materials such as WC or stellite poweders were cladded on the mild steel using resistance cladding method. 1 mm-thick powder beds containing the hard material and brazing material were made before cladding. And effects of welding current, welding speed and electrode pressure on microstructures, porosity and wear resistance were studied. Wear loss of the specimen was measured by labor-wheel wearing test machine. Main results obtained are as follows ; (1) The hard materials were not melted during the resistance cladding welding and the materials were bonded on the mild steel by the brazing material. The brazing material was melted well in case of higher welding current and lower electrode pressure. (2) The thickness of the cladded layr was about 300 to 800 mum. (3) The porosity in the cladded layr decreased with increase of the welding current and with decrease of the electrode pressure. (4) It was found from the result of bending test of the clad specimen that the bondability of the hard material to the mild steel was nery strong. (5) The wear resistance was improved with increase of welding current.