STUDY OF EFFECT GROOVE DESIGN AND POST WELD HEAT TREATMENT TEMPERATURE ON REPAIR OF CAST IRON COMPONENTS USING SMAW WELDING METHOD

• Main Author: Nur Muhammad, Yasya
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/49980
• Institution: Institut Teknologi Bandung

The high carbon content of cast iron alloys has brittle properties. The brittle nature of cast iron causes frequent failure in the form of cracks during formation or use. These cracks can be repaired by welding. Another constraint when welding for repair is that cast iron has low weldability. In this study, a research was conducted to optimize the welding of cast iron to repair cracks in cast iron by using the SMAW welding method with the optimized parameter variables were groove design and post weld heat treatment temperature. In addition, this study also conducted secondary data assessments to determine the effect of welding process parameters on HAZ width, microstructure, and hardness. In the experimental section, after SMAW welding with various groove designs, tests were carried out to obtain experimental data on the effect of groove design on HAZ width, microstructure, and hardness. The microstructure was obtained from the metallography results. Hardness test was carried out using a microvickers machine. The analysis was carried out after obtaining experimental data from literature studies and experimental data from the test results. The secondary data study resulted in a data trend, namely the greater the volume of the weld area due to variations in groove design resulting in differences in heat input which led to changes in microstructure and hardness values. Post weld heat treatment can enlarge the micro structure, causing a decrease in the hardness value. The groove design variations resulted from the experiment resulted in a large HAZ width, large microstructure, and small hardness in specimens that had a groove design with a large weld area volume.