The effect of ship replating welding process on floating conditions against strength value

Abstract

Abstract Ship replating is one of the important things in the process of ship maintenance. Ship replating can be done during docking and floating. The cooling rate of the welding process gave different effects on the mechanical properties of the material when the welding process is in a floating position and docking position. This research uses four variations in the distance between the weld groove lines and the water lines which were 30 mm, 60 mm, 100 mm, and 130 mm. This research also uses four variations in water temperature were 25°C, 28°C, 30°C and 32°C. The strength value of the variations will be compared to the strength value of dock welding. The results of tensile testing showed that there was a decrease in strength value at each increment of the water line spacing with weld groove lines and water temperature variations. Based on this research, welding in a floating condition with a minimum distance waterline and weld groove line of 30 mm, and the temperature of water between 25°C - 32°C can be applied in the field, because the strength value for all variations on this research satisfies by BKI (Biro Klasifikasi Indonesia) standards.