OPTIMALISASI PENGELASAN BAJA ASTM A387 DENGAN CREUSABRO 8000 PADA KASUS COLD CRACKING

• Main Author: Farqa Ramadina, Ully
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/75707
• Institution: Institut Teknologi Bandung

<p align="justify"> The rapid growing of electric vehicle technology affects the increasing demand of nickel as one of the vital components in battery for electric vehicle and affecting the nickel processing industry. One of the steps of nickel processing is drying nickel ore in rotary dryer. The rotation of rotary dryer causes abrasion between nickel ore and shell dryer and leads to wear. One of the solutions for this problem is by welding Creusabro 8000 wear plates to ASTM A387 Gr.91 shell dryer. But the weldment shows cold cracking after dehydrogenation heat treatment (DHT) at 350 °C for 2 hours. The reason for cold cracking to happen in weld metal with martensite microstructure is predicted to be because of the unsuitable post-weld heat treatment (PWHT) process and the relatively large gap between two base metals. Welding parameters used for this experiment are varied for welding optimization, such as presence of root gap, diameter of E9018-B3 electrode which 2.5 mm and 3.2 mm and preheat temperature which 175 °C and 215 °C used in this research. All welding samples are air-cooled until room temperature before doing DHT and PWHT. All welding optimization samples show no cracking, show decreasing hardness number, and show a tempered martensite microstructure which finer and uniform compared to martensite in cracked sample.