Tungsten inert Arc welding (TIG) is the most important process for welding high strength steel (HSS) alloy sheets in manufacturing industry. Typically welding parameters namely current, type of shielding gas, electrode and quality of material are the important parameters. Altering the weld parameters can achieve desired welding requirements, especially the strength and consistency of weld are determined through radiography, tensile testing for strength analysis. Optimization of the results for weldments in the case of low alloy steel sheets is based upon the relationship between current and weld strength analyzed through tensile strength analysis. The analysis is accentuated by microstructure analysis that indicates strong relationship in attaining good weld quality. The correct understanding of TIG parameters is the most important task required to obtain optimized weld of low alloy steel sheets with high quality standards for pressure vessels used for boilers in the manufacturing industry. In this study an effort is made to evaluate the existing weld parameters to attain an optimal solution in terms of strength and load bearing parameters based on the comparative analysis of CT vis-a vis microstructure analysis of TIG welding. It is therefore investigated the effects of connected parameters to obtain high quality weld in low alloy steel sheets and finalize recommendation of optimized TIG welding.