Investigation of Influence Heat Treatment on Mechanical Properties of Welded Joints
DOI:
https://doi.org/10.65405/.v10i37.610Keywords:
Welding, Low Carbon Steel, (PWHT), (NDT), Microhardness, Microstructure.Abstract
This research investigates the impact of post-weld heat treatment (PWHT) on the
mechanical properties of butt- welded low carbon steel joints. Welding processes can
induce thermal stresses and microstructural changes that negatively affect mechanical
performance. The study utilized Shielded Metal Arc Welding (SMAW) with controlled
parameters and an E10-60 electrode. Non-destructive testing (NDT) methods, including
Dye Penetrant Testing, UV Inspection, and Magnetic Field Detection, were applied to
assess weld quality before and after welding. Subsequent heat treatment, specifically
tempering at 550°C for 20 minutes followed by slow air cooling, was performed to
balance hardness and toughness. Microstructural analysis and microhardness testing
were conducted to evaluate the effects of the heat treatment on the welded joints. The
results indicate that tempering significantly reduces hardness, particularly in the HeatAffected Zone (HAZ), and enhances toughness and ductility, which are crucial for
preventing cracking and failure in welded joints.
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