Journal of Welding and Joining

The Korean Welding and Joining Society (대한용접접합학회)
권호 표지
DOI QR코드

DOI QR Code

Analysis of Adhesive Slag Formed on Weld Metal Surface of GTAW Welding after Flux Cored Multi-Pass Welding

FCAW 다층 용접 후 표면 GTAW 용접시 표면 용접부에 생성된 고착 슬래그 분석

  • 김정민 (한국기계연구원 부설 재료연구소) ;
  • 김남규 (한국기계연구원 부설 재료연구소) ;
  • 김기동 (한국기계연구원 부설 재료연구소) ;
  • 박지홍 (한국기계연구원 부설 재료연구소)
  • Received : 2015.10.16
  • Accepted : 2015.10.22
  • Published : 2015.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

This study has been performed to investigate the adhesive slag at GTAW weld zone after FCAW multi-pass welding. The cause of adhesive slag formation was examined using optical microscope, field emission scanning electron microscope(FE-SEM) and XRD analysis. The results obtained in this experiment are summarized as follows. Slag of GTAW weld zone surface during welding were formed by mixing the presence of slag in FCAW weld zone. While the slag cools, Cr-spinel phase were formed due to reactions in slag/metal interface. Also, a Cr moves form the weld metal to the slag to strong affinity between oxide atoms and Cr atoms. Hence, detachability of slag was exacerbated by decreasing the interfacial tensions between slag and weld metal.

Keywords

References

  1. Tea-Hoon Kim et al., Development of Welding Consumables for GMAW and FCAW, Journal of KWJS. 26 (2) (2008), 103 (in Korean)
  2. D. Katherasan et al., Flux Cored Arc Welding Parameter Optimization of AISI 316L (N) Austenitic Stainless Steel, World Academy of Science. 61 (2012), 760
  3. D. J. Kotechi et al., A Toughness Study of Steel Weld Metal From Self-Shielded Flux-Cored Electrodes, Welding Research Supplement. April (1970), 157
  4. Min-Chul Kim, Effects of Al, Mn and Si Contents on Spatter, Microstructure and Mechanical Property with 490Mpa Grade Flux Core Wire, Journal of KEJS. 28 (1) (2010), 60 (in Korean)
  5. M. Vedani et al., Problems in Laser Repair-Welding a Surface-Treated Tool Steel, Surface & Coating Technology. 201 (2007), 4518 https://doi.org/10.1016/j.surfcoat.2006.09.051
  6. W. T. Preciado et al., Repair Welding of Polymer Injection Molds Manufactured in AISI P20 and VP50IM Steels, J. Mater. Process. Tchnol. 179 (2006) 244 https://doi.org/10.1016/j.jmatprotec.2006.03.101
  7. Y. C. Woo et al., A Study on the Evaluation Method for Slag Detachability, Journal of KWJS. 5 (1) (1987), 57 (in Korean)
  8. Li Zhuoxin et al., Study on Slag Detachability and Stick Slag Mechanism of SSFCE, Transactions of Tianjin University. 3 (1997), 79
  9. A. O. Oladipupo : Slag Detachability from Submerged Arc Welds, Massachusetts Institute of Technology. (1987)
  10. Ingvar Atli Sigurdsson et al., Calcium-Rich Melt Inclusions in Cr-Spinels from Borgarhraun Northern Iceland, Earth and Planetary Science Letters. 183 (2000) 15 https://doi.org/10.1016/S0012-821X(00)00269-7
  11. Joo-Hyun Park, Formation Mechanism of Spinel-Type Incusions in High-Alloyed Stainless Steel Melts, Metallurgical and Materials Transaction B. 38B (2007) 657
  12. C. K. Kim et al. : Thermodynamics of Iron Alumino-Chromite Spinel Inclusions in Steel, Metallugical and Materials Transactions B. 10B (1979) 585
  13. Alina Aguero et al., Oxidation under Pure Steam : Cr Based Protective Oxides and Coatings, Surface & Coating Technology. 273 (2013), 30
  14. D. Kathersan et al., Shielding Gas Effects on Flux Cored Arc Welding of AISI 316L (N) Austenitic Stainless Steel Joints, Materials and Design. 45 (2013), 43 https://doi.org/10.1016/j.matdes.2012.09.012
  15. M. A. Quintana et al., inclusion Formation in Self-Shielded Flux Cored Arc Welds, Welding Research Supplement. April (2001), 98
  16. Jun-Seok Seo et al., Characteristics of Inclusions in Rutile-Type FCAW Weld Metal, Weld World. 57 (2013), 65 https://doi.org/10.1007/s40194-012-0009-z
  17. E. Baune et al., Reconsidering the Basicity of a FCAW Consumable-Part 2 : Verification of the Flux/Slag Analysis Methodology for Weld Metal Oxygen Control, Welding Research Supplement. March (2000), 66
  18. Carmen Ostwald et al., Initial Oxidation and Chromium Diffusion-Effects of Surface Working on 9-20% Cr Steels, Corrosion Science. 46 (2004), 1113 https://doi.org/10.1016/j.corsci.2003.09.004
  19. C. Wagner, Type of Reaction in the Oxidation of Alloys, Z. Elektrochem. 63 (1959), 772
  20. G. C. Wood et. al., Chromium Oxide Scale Growth on Iron-Chromium Alloys, J. Elektrochem. Soc. 115 (1968), 126 https://doi.org/10.1149/1.2411044
  21. J. D. Tucker et al., Ab initio-Based diffusion Theorty and Tracer Diffusion in Ni-Cr and Ni-Fe Alloys, Journal of Nuclear Materials. 405 (2010), 216 https://doi.org/10.1016/j.jnucmat.2010.08.003
  22. I. K. Pokhodnya et al., Study of Peculiarities of the Mechanism of adhesion of the Slag Crust to the Weld Metal Alooyed with Titanium and Vanadium, Avt. Svarka. 6 (1976) 1
  23. I. K. Pokhodnya et al., The Mechanism of the Bond between the Slag Crust and the Weld Surface, Avt. Svarka. 5 (1974) 5
  24. M. Naka et al., Formation of Hercynite ($FeAl_2O_3$) at Interface of $Al_2O_3$/Steel Joint, Trans. JWRI. Vol. 11 (1982) 131 https://doi.org/10.1007/BF00167928
  25. J. T. Klomp, Interfacial Reactions between Metals and oxides during Sealing, Ceramic Bulletin Vol. 59 (1980) 794
  26. S. B. Yakobashvili, The Inter-Phase Tension of Welding Fluxes and Its Effect on the Rase with which the Slag Crust is Removed, Avt. Svarka. 9 (1962)
  27. D. M. Rabkin : About Detachability of Slag Crust in Automatic Submerged Arc Welding, Avt. Svarka. 3 (1950) 10
  28. D. M. Rabkin et al, : Adhension of the Slag Crust to the Surface of the Weld Metal when Welding by SA Process, Autogennoe delo. 6 (1951)
  29. S. B. Yakobashvili, Effects of Cr and V on Inter-Phase Surface Tension between Liquid Steel & Flux, Avt. Svarka. 8 (1962)
  30. P. V. Riboud et al., Mass Transfer in Iron & Steelmaking, Canadian Metallurgical Quarterly Vol. 20 (1981)