THE STUDY OF GAS METAL ARC WELDING PROCESS INTEGRATED WITH TEMPER BEAD WELDING ON PROPERTIES OF ST37 CARBON STEEL WELDING

Abstract

This research were aimed to 1) study the hardness of welding line integrated with temper bead welding, and 2) study microstructure of heat affected zone of the material after temper bead welding. The specific factors of this study were 250 Ampere of electric current and the traverse speed at 400 millimeters per minute.  The study used EWM welding machine model P 351 and the welding wire code of ER 70s-6, with 1.2 millimeters diameter. The gas consisted of 80 percent argon and 20 percent carbon dioxide. The parent welding material used overlap method and cut in 10-100 percent. The welding metal was tested the mechanical quality on hardness and studied the microstructure of the welding material. The result of mechanical quality on hardness of welding line, heat affected zone, and surface of welding material found that the best quality on hardness of welding was at the 80-90 percent overlap. The heat affected zone of the material after temper bead welding by overlap welding got same size grain and well-organized. The grain had same size as welding metal and the mechanical properties of welding metal was better than before temper bead welding.