AIMS Materials Science, 2016, 3(4): 1544-1560. doi: 10.3934/matersci.2016.4.1544 Research article Special Issues

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Effect of transverse mechanical arc oscillation on hot cracking (solidification & liquation) and weld metal properties of AA2014 T6 TIG welds

N. S. Biradar

Department of Mechanical Engineering, College of Engineering, Osmanabad, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, Maharashtra, India

Received: , Accepted: , Published:

Special Issues: Interaction of Multiple Cracks in Materials -Volume 1

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Effect of Transverse Mechanical Arc Oscillation on solidification and liquation cracking in autogenous and filler metals (standard AA4043 and non-standard AA1100 fillers) full penetration heat treatable AA2014 T6 aluminium alloy has been investigated. Both, linear and circular TIG welds were made using specially designed welding setup using Mechanical Arc Oscillation. Arc oscillation was carried out using range of oscillation parameters (amplitude: 0.9–2.0 mm and frequency: 0.28–1.5 Hz). Microstructure and mechanical tests studies were carried out to determine the extent of hot cracking, changes in the microstructure in weld fusion zone and adjacent, partially melted zone and weld mechanical properties respectively. Reduction/elimination of both solidification and liquation cracking due to arc Transverse Mechanical Arc Oscillation in autogenous and filler metal linear and circular TIG welds of AA2014 T6 alloy was significant. Optimum oscillation parameters: amplitude (0.9 mm) and frequency (0.48 Hz), significantly assisted to reduce/eliminate cracking in the fusion zone and adjacent partially melted zone. Interestingly, in these welds, fusion zone grain size was minimum, 12 μm as compared to 21.9 μm in without arc oscillation. Solidification cracking tendency had a non-monotonic dependence while liquation cracking showed monotonic dependence on the combination of arc oscillation parameters with AA1100 filler welds. AA4043 filler welds produced noticeable improvements in mechanical properties. Increments upto 16.6% in YS, 5.6% UTS, 34% ductility, and 17% joint efficiency.

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References

1. Sindo K (2003) Welding Metallurgy, 2^nd Edition. New York, N.Y.: John Wiley and Sons.

2. Apblett WR, Pellini WS (1954) Factors which influence weld hot cracking. Weld J 33: 83s–90s.

3. Feng ZL (1993) A methodology for quantifying thermal and mechanical conditions for weld metal solidification cracking. Ph D Thesis, The Ohio State University.

4. Jennings PH, Singer ARE, Pumphrey WI (1948) Hot-Shortness of some High-Purity Alloys in the Systems Aluminum-Copper-Silicon and Aluminum-Magnesium-Silicon. J Inst Metals 74: 227–248.

5. Dowd JD (1952) Weld Cracking of Aluminum Alloys. Weld J 31: 448s–456s.

6. Cross CL (1986) Weldability of Aluminum-Lithium alloys: An Investigation of Hot Tearing Mechanism, Ph.D. Thesis, Colorado School of Mines.

7. Matsuda F, Nakata K, Tsukamoto K, et al. (1983) Al-Zn-Mg alloy Report-II, Trans JWRI 12: 93.

8. Dvornak MJ, Frost RH, Olson DL (1989) The Weldability and Grain Refinement of Al-2.2Li-2.7Cu Alloy. Weld J 68: 327s–335s.

9. Koteswara RSR, Madhusudhana RG, Kamaraj M, et al. (2005) Grain refinement through arc manipulation techniques in Al-Cu alloy GTA welds. Mat Sci Eng A 404: 227–234.

10. Tseng C, Savage WF (1971) The effect of arc oscillation. Weld J 50: 711–786.

11. Kou S, Le Y (1985) Alternating grain orientation and welding solidification cracking. Metall Trans 16A: 1887–1896.

12. Kou S, Le Y (1985) Improving weld quality by low frequency arc oscillation. Weld J 64: 51–55.

13. Garland JG (1974) Weld Pool Solidification and Control. Met Constr Br Weld J 6: 121–127.

14. Huang C, Kou S (2004) Liquation cracking in Full-penetration Al-Cu welds. Weld J 83: 50s–58s.

15. Yuan T, Chai X, Luo Z, et al. (2015) Predicting susceptibility of magnesium alloys to weld-edge cracking. Acta Mater 90: 242–251.

16. Biradar NS, Raman R (2012) Investigation of Hot Cracking Behavior in Transverse Mechanically Arc Oscillated Autogenous AA2014 T6 TIG Welds. Metall Mater Trans A 43: 3179–3191.

17. Kou S, Le Y (1985) Grain structure and solidification cracking in oscillated arc welds of 5052 aluminum alloy. Metall Trans A 16A: 1345–1352.

18. Sundaresan S, Janakiram GD (1999) Use of magnetic arc oscillation for grain refinement of gas tungsten arc welds in α-β titanium alloys. Sci Technol Weld Joi 4:151–161.19. Yuan T, Luo Z, Kou S (2016) Grain Refining of Magnesium Welds by Arc Oscillation. Acta Mater 116: 166–176

20. Huang C, Kou S (2004) Liquation Cracking in Full-Penetration Al-Mg-Si Welds. Weld J 83: 111s–122s.

21. Messler RW (1999) Principles of Welding, John Wiley and Sons, Inc., New York, NY, 175–176.

22. Courtney TH (1990) Mechanical Behaviour of Materials, McGraw-Hill.

Copyright Info: © 2016, N. S. Biradar, licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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