ANALYSIS OF THE EFFECT OF HEAT INPUT VARIATIONS ON THE SMAW HARDFACING PROCESS USING NANOMETAL FILLERS TO THE MECHANICAL PROPERTIES OF WELDING METALS

• Main Author: Wardoyo, Toto
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/46551
• Institution: Institut Teknologi Bandung

One of the significant developments in the industrial world is hardfacing techniques through the welding process. With this technique, the service life of components can be better which has resistance to wear problems, erosion, corrosion, and abrasion but still at competitive cost. Various studies have been conducted to improve the quality of these welding results. One thing that is done is the using of nano metal in welding, both as an electrode and as a filler. And from several studies that have been conducted showing metal welding with the use of nanometal has increased the value of weld metal hardness, improve the properties of welding results and reduce the defects. The purpose of this study was to determine the effect of variations in heat input through the SMAW process using nanometal fillers. Tests carried out by hardfacing welding SMAW to SA-36M base metal with variations of heat input 1,48 (KJ/mm); 1,73 (KJ/mm); 1,85 (KJ/mm); 1,93 (KJ/mm) to the mechanical properties of welding metal such as hardness, erosion resistance, and bending ability The test results show that nano carbide particles are able to be evenly dispersed in pearlite grains and proportional to all welding metals. These particles become an element to increase nucleation and refinement of equiaxed dendritic grains of size (5-20 µm). The highest hardness was found in the test sample with heat input 1.85 (KJ / mm) worth 432 HRV. Welding results are able to have good erosion resistance which has a service life of 1.5 times compared to SA36 base metal material.