Evaluation the Mechanical Behavior of SS 304L Welding Joints Designed and Fabricated According to ASME Section IX for Cryogenic Applications of Green Energy

Abstract

The strength and toughness required for the weld metal differs greatly depending upon the application for which the structure is employed and according to the type of steel and welding materials, In this study, an austenitic stainless-steel pipe, type A304L was welded with gas tungsten arc with a wall thickness of (10) schedule, Low-temperature Charpy V-Notch (CVN) impact tests were performed to investigate the effect of low temperatures on the fracture toughness of the Welded Zone (WZ), Heat-Affected Zone (HAZ) and Base Metal (BM) of pipe. For design and safety reasons, it is necessary to investigate the low-temperature impact properties of weld metals, because weld metals have higher susceptibility to embrittlement than their counterpart base metals. The mechanical characteristics of SS304L weldments were evaluated based on tensile, Charpy impact and hardness of the WJ and BM have been measured. The conclusions from this study are summarized as follows: Mechanical tests are carried out on cryogenic temperature to check the weld behavior of stainless steel 304L under cryogenic condition of hydrogen storage units of green energy. 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.