Gas tungsten arc and laser beam welding processes effects on duplex stainless steel 2205 properties

A. H.I. Mourad, A. Khourshid, T. Sharef

Research output: Contribution to journalArticlepeer-review

115 Citations (Scopus)

Abstract

A comparative study on the influence of gas tungsten arc welding (GTAW) and carbon dioxide laser beam welding (LBW) processes on the size and microstructure of fusion zone FZ then, on the mechanical and corrosion properties of duplex stainless steel DSS grade 2205 plates of 6.4. mm thickness was investigated. Autogenous butt welded joints were made using both GTAW and LBW. The GTA welded joint was made using well established welding parameters (i.e., current ampere of 110. A, voltage of 12. V, welding speed of 0.15. m/min and argon shielding rate of 15. l/min). While optimum LBW parameters were used (i.e., welding speed of 0.5. m/min, defocusing distance of 0.0. mm, argon shielding flow rate of 20. l/min and maximum output laser power of 8. kW). The results achieved in this investigation disclose that welding process play an important role in obtaining satisfactory weld properties. In comparison with GTAW, LBW has produced welded joint with a significant decrease in FZ size and acceptable weld profile. The ferrite-austenite balance of both weld metal WM and heat affected zone (HAZ) are influenced by heat input which is a function of welding process. In comparison with LBW, GTAW has resulted in ferrite-austenite balance close to that of base metal BM due to higher heat input in GTAW. However, properties of LB welded joint, particularly corrosion resistance are much better than that of GTA welded joint. The measured corrosion rates for LBW and GTAW joints are 0.05334. mm/year and 0.2456. mm/year, respectively. This is related to the relatively small size of both WM and HAZ produced in the case of LBW. In other words, properties of welded joints are remarkably influenced by FZ size rather than the produced austenite-ferrite balance.

Original languageEnglish
Pages (from-to)105-113
Number of pages9
JournalMaterials Science and Engineering A
Volume549
DOIs
Publication statusPublished - Jul 15 2012

Keywords

  • Corrosion resistance
  • Duplex stainless steel
  • Fusion zone configuration
  • GTA welding
  • Laser beam welding
  • Mechanical properties
  • Microstructure

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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