Investigation the mechanical proporties of weld experiments designed and fabricated according to ASME section IX for cryogenic -LNG application.

This study investigates the mechanical properties of stainless steel weld joints fabricated using the Gas Tungsten Arc Welding (GTAW) process with ER308L filler metal. The objective is to assess the suitability of the weldment for cryogenic hydrogen storage applications. Hardness, tensile, and impact tests were conducted to evaluate strength and toughness across the weld, heat-affected zone (HAZ), and base metal. The results indicate that the optimized GTAW parameters produced a homogeneous and balanced microstructure with hardness and strength suitable for cryogenic exposure. The overall findings demonstrate the weld joint’s potential to maintain mechanical integrity at low temperatures, which is critical for LNG applications.. The weld joints were successfully produced without weld defects such as cracks or blowholes. The yield strength and fracture toughness for all specimens satisfy the structural design criteria ASME and ASTM.