Effect of welding preheats on metallurgical analysis and microstructural development

• Published in: IOP Conference Series: Materials Science and Engineering
• Main Author: Mazni M.; Bin Ismail M.H.; Bin Pahroraji H.F.; Malik N.A.; Mohd Hamami M.G.B.; Sukarman F.; Sulong N.
• Format: Conference paper
• Language: English
• Published: Institute of Physics Publishing 2020
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85087496324&doi=10.1088%2f1757-899X%2f834%2f1%2f012045&partnerID=40&md5=e10e800c5cfba97eb4a4a595e91b72ff

This project is to study the effect of welding preheat on metallurgical analysis and microstructural development. Variables such as current, speed of welding and size of specimen were fixed. In the present work, a mild steel plate with thickness of 100 mm and width size of 20 mm was used. SMAW (Shielded Metal Arc Welding) technique was chosen as it is the easiest way to perform and widely used in oil & gas and marine industries. Three different preheat temperatures were performed during the study; ambient temperature (no preheat), between 60 °C to 70°C and greater than 200 °C. The study emphasizes on the minimum preheat temperature that produce good quality welding by taking into account some of metallurgical aspects; microstructure and macrostructure development, hardness distribution at important areas in weld (Heat Affected Zone, parent metal and weld area) through thickness. From this study, code American Welding Society (AWS) D1.1 was used as a reference and it stated that for plate that has 100 mm thickness the preheat temperature should be in the range of 60 °C and 70°C. The result of microstructure and macrostructure showed that the depth of penetration was not vary too much. Hardness measurement, macro and microstructure observation were performed in order to obtain a good correlation exist between these parameters studied. © 2020 IOP Publishing Ltd. All rights reserved.