Prolonging of the Service Life of Propeller Shaft by Flux Core arc Welding Process

Abstract

The aim of this research was to study the prolonging of service life efficiency of weld surfacing E71T-1C/T-9C grade and E110 T5-K4M H4 grade. The method of this research was (1) building up the welding surface E71T-1C/T-9C grade and E110 T5-K4M H4 grade, (2) forming specimen, (3) fatigue strength testing and (4) microstructure investigation. The results of this research showed that the weld surfacing E110 T5-K4M H4 grade could extend the lifespan of propeller shafts by 2 times longer than that of the weld surfacing E71T-1C/T-9C grade. The amount of Acicular Ferrite structure was 85% for resist fatigue mechanism. This research result is expected to benefit Marine Repair Technician at Kaoseng Community on the Coast of Songkla Lake.