Open AccessCOMPARISON STUDY OF CONSTANT CURRENT AND ARC OSCILLATION TECHNIQUES ON GTA WELDED AZ31B MAGNESIUM ALLOY JOINTS
Author(s) -
Subravel,
Chandrasekaran
Publication year - 2020
Publication title -
journal of manufacturing engineering
Language(s) - English
Resource type - Journals
ISSN - 0973-6867
DOI - 10.37255/jme.v15i1pp015-018
Subject(s) - materials science , welding , metallurgy , gas tungsten arc welding , tungsten , ultimate tensile strength , arc welding , magnesium alloy , oscillation (cell signaling) , fusion welding , magnesium , heat affected zone , alloy , composite material , chemistry , biochemistry
The challenges of achieving significant weight reduction in the automobile industry in the context of fuel savings, recyclability and emission reduction has promoted focus on lightweight metals such as magnesium. GTA welding technology is the main welding method adopted for magnesium alloys because of its advantages of utility and economy. Both magnetic arc oscillation and current pulsing techniques resulted in significant microstructural refinement in weld fusion zone. Hence in this investigation an attempt has been made to study the constant current and arc oscillation on tensile and microstructural characteristics of gas tungsten arc welded AZ31B magnesium alloy joints. From this investigation, it is found that the joints fabricated with magnetic arc oscillation having the superior tensile properties compared to constant current welding. The formation of fine grains and higher hardness in fusion zone are the main reasons for the superior tensile properties of these joints.