Room-temperature stress reduction in welded joints through electropulsing

Aman Haque, John Sherbondy, Daudi Warywoba, Paul Hsu, Sukesh Roy

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Conventional residual stress mitigation techniques involve long processing times at high temperatures and/or mechanical loading to build plastic compressive stress below the surface. In this study, we present a new residual stress mitigation methodology at near ambient temperature in less than a minute. This is demonstrated on a welded joint of 316 L stainless steel, where low-frequency DC current pulses are shown to recrystallize the specimen and reduce residual stress. We present experimental evidence of ∼30 % reduction in electrical resistance, which corresponded to ∼40 % decrease in both microhardness and residual stress, measured by the X-ray diffraction tests. Similar improvement was qualitatively observed through significant decrease in the low-angle grain boundary density, which also reflects the decrease of the residual stress. The technique can be applied to relieve residual stress in conditions difficult for the conventional processing, such as locations with extreme space constraints or objects that cannot be heat treated.

Original languageEnglish (US)
Article number117391
JournalJournal of Materials Processing Technology
Volume299
DOIs
StatePublished - Jan 2022

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

Fingerprint

Dive into the research topics of 'Room-temperature stress reduction in welded joints through electropulsing'. Together they form a unique fingerprint.

Cite this