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http://dx.doi.org/10.5574/KSOE.2012.26.1.064

Optimization of Friction Welding for Motor Vehicle Safety Belts: Part 1-Mechanical Properties and Microstructure  

Kong, Yu-Sik (Bukyong Education Center for Vehicle Safety Component Technology, Pukyong National University)
Ahn, Seok-Hwn (Bukyong Education Center for Vehicle Safety Component Technology, Pukyong National University)
Publication Information
Journal of Ocean Engineering and Technology / v.26, no.1, 2012 , pp. 64-69 More about this Journal
Abstract
Dissimilar friction welds were produced using 15-mm diameter solid bars of chrome molybdenum steel (KS SCM440) and carbon steel (KS SM20C) to investigate their mechanical properties. The main friction welding parameters were selected to ensure good quality welds on the basis of visual examination, tensile tests, Vickers hardness surveys of the bond area and HAZ, and macro-structure investigations. The specimens were tested as-welded and post-weld heat treated (PWHT). The tensile strength of the friction welded steel bars was increased to 100% of the SM20C base metal under the condition of a heating time of more than four seconds. Optimal welding conditions were n = 2,000 (rpm), HP = 60 (MPa), UP = 100 (MPa), HT = 5 (s),and UT = 5 (s), when the total upset length was 7.8 (mm). The hardness distribution peak of the friction welded joints could be eliminated using PWHT. The two different kinds of materials were strongly mixed to show a well-combined structure of macro-particles, with no molten material, particle growth, or defects.
Keywords
Friction welding; Post weld heat treatment (PWHT); As-welded; Base metal (BM); Heat affected zone (HAZ); Weld interface (WI); Welding condition;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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