STUDY OF THE EFFECT OF NUMBER OF PASSES AND INTERPASS CLEANING ON CAST IRON COMPONENTS REPAIRS USING THE SMAW METHOD

• Main Author: Abdul Rokhim, Muhammad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62755
• Institution: Institut Teknologi Bandung

Cast iron components are prone to cracking both when finished production and during operation. These cracks can be repaired using several methods, one of which is welding. However, repair of cast iron components by welding is very important to increase the reliability of these components. Therefore, in this study, optimization of the welding of cast iron components was carried out. This research was conducted with two approaches, namely the study of secondary and experimental data. Both studies focused on the effect of pass number and interpass cleaning on cast iron repair. In the secondary data study, the parameters evaluated were porosity, welding dimensions, cooling rate, HAZ width, and hardness, while the parameters evaluated in the experiment were porosity, boundary between passes, heat input, HAZ width, and hardness. The porosity and width of the HAZ were obtained from stereo observations, while the boundaries between passes were obtained from metallographic results. Hardness test was carried out with a Vickers test machine. The analysis was carried out after all the data had been collected. The secondary data study showed a trend in the data, namely the cleaned samples had less porosity and smaller dimensions. Meanwhile, the higher the number of passes, the lower the heat input resulting in a higher cooling rate, smaller HAZ, and higher hardness. Experimental data shows that interpass cleaning has an effect on porosity and finer passes, while the more passes, the narrower the HAZ width and the lower the hardness value.