Session: Recent Experiences With Austenitic and Duplex Stainless Steels
Evaluation of Structural Integrity Following Multiple Weld Repairs in Austenitic Stainless Steel Joints for Cryogenic Service (C2026-00188)
Thursday, March 19, 2026
8:30 AM - 9:00 AM Central
Location: 370 EF
Earn .5 PDH
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The physical and mechanical properties of weldment are typically determined through a Procedure Qualification Record (PQR), which generally involves the use of new base metal and weld deposits. However, in certain fabrication scenarios involving weld repairs, fully removing the entire defective weld and its associated Heat Affected Zone (HAZ) to restore the original base metal and joint configuration may not be practically achievable. Consequently, multiple localized weld repair attempts may be required within the same weld area. This study presents a structural integrity evaluation of a dual grade austenitic stainless-steel (304/L SS) circumferential weld joint subjected to repeated weld repairs within the same region. The weld joint in question is designed for cryogenic service, operating at temperatures as low as −176 °C (−284 °F). For assessment purposes, a mockup specimen was fabricated by applying the original weld followed by successive weld repairs, replicating the production weld and resulting overlapping HAZ on the base material. The paper discusses the impact of these repeated repairs on the mechanical and physical properties of both the weld metal and the base metal. The findings provide insights into the suitability of such weld repaired joints for cryogenic applications.
