EFFECT OF POST WELDING HEAT TREATMENT ON MECHANICAL PROPERTIES OF GTA WELDED SA 516 GRADE 70 CARBON STEEL

KapilkumarD Gohil, Krunal Parmar, Jenish Patel

Abstract: This investigation was carried out with the aim of studying the effect of Post Weld Heat Treatment (PWHT) on the mechanical properties of SA-516 Grade 70 weld joint. The objective was to identify the effect of post weld treatment temperature on mechanical properties like tensile strength, hardness & bending strength of weld joint. In order to optimize heat treatment conditions, different PWHT temperature were applied with one hour holding time & furnace cooling. Range of temperature selected below the Ac1 temperature from 550°C to 640°C with a span of 30°C interval. Heat treatment process were carried out in muffle furnace with high heating rate. To assess the effect of different treatment schemes on the mechanical properties, hardness, tensile strength and bend strength have been employed on these weld joints. Preparation of specimen for testing were as per the ASTM A-307. The results show that the there is a substantial increment of tensile strength as increasing PWHT temperature where hardness value is decrease as increasing PWHT temperature.

Keywords: PWHT, ASTM A-370, Tensile strength, and Bend Test

DOI: https://doi.org/10.15623/ijret.2018.0707013