The Effects Of Welding Parameters On The Mechanical Properties On Manual Metal Arc Welding Of A36 Low Carbon Steel.

Abstract

In order to obtain properties that fully satisfy the requirements placed on welded structures; the properties of the heat-affected zone have been examined to identify changes in material properties caused by variations in welding parameters and conditions. The high-temperature fusion process during welding results in microstructural and mechanical property changes close to the weld line, in the heat-affected zone, which significantly alters the parent material's mechanical properties. This work prepares a specimen with Butt and LAP joints in order to examine the tensile test, hardness test, and microstructure of the heat-affected zone of 5mm A36 low carbon steel that was welded using a manual metal arc welding procedure. The goal of the experiment was to determine how heat input influenced the hardness, tensile strength, and microstructure of the heat-affected zone. The investigation's findings show that a considerable increase in hardness with rising temperatures led to a fall in the hardness rating of the heat-affected zone. According to the experiment, the average heat-affected zone hardness is 16.5% greater than the parent metal hardness, while the average heat-affected zone toughness and tensile strength are 18.5% and 6.5 percent lower than the parent material hardness, respectively. The mechanical parameters of the heat-affected zone did not significantly change when the welding speed was changed. Therefore, it is advised that the plate form and ramp, two low bed semi-trial chassis components, be made using the findings of this work.