Effect of different preheating's temperature towards the integrity of weldment AISI 1045

Abstract

The purpose of this paper is to show the effect of different preheating's temperature for different thickness of AISI 1045 before it was welded by using Shield Metal Arc Welding (SMAW). The temperature of preheating approach that will be use are 200oC, 250oC and 300oC and were applied to pair of base plate metal with different thickness of 16mm, 22mm and 28mm. Then the pair samples had been welded by using Shield Metal Arc Welding (SMAW). To monitoring the temperature, non-contact type instrument which is thermomapping was used in this study. Time was recorded after preheating was applied and then was stopped when the desired temperature has been obtained. As to evaluate the weld quality, the macrostructure observation, dye penetration, hardness, and tensile test were conducted. As the result, it found that the electrode rod with size16mm and 22mm required preheating's temperature around 200° C while for 28mm required temperature up to 250°C. This paper will give a deeper understanding about the effect of preheating in term of strength of joining. The result obtained from this study can be used to assist welder while performing welding on medium carbon steel.