Abstract
This paper describes the effects of pulsed TIG welding process parameters (pulse duration, peak current, and pulse frequency) on the microstructure and microhardness of Al-0.8%Mg-0.5%Si (6061) alloys. It was observed that pulse TIG welding produced finer grain structure of weld metal than conventional TIG welding (without arc pulsation). An increase in the pulse frequency has been found to refine the aluminium and eutectic grain structure of weld metal especially when welding is done using short pulse duration. Long pulse duration lowers the pulse frequency up to which refinement of constituents in weld metal takes place. Effect of the pulse frequency on the grain structure was found to be determined by pulse duration. For a given pulse frequency, long pulse duration produced a coarser structure than short pulse duration. An increase in the peak current coarsened the grain structure.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Dwivedi DK (2002) Influence of modifier and grain refiner on solidification behaviour and mechanical properties of cast Al-Si base alloys. IEI 83:46–50
Kou S (2003) Welding metallurgy. Wiley Inter-Science, Canada, pp 187–194
Rao SRK, Madhusudhana G, Kamraj M, Rao KP (2005) Grain refinement through arc manipulation techniques in Al-Cu alloy GTA welds. Mater Sci Eng A 404:227–234
Ellis MBD, Gittos MF, Hadley I (1997) Significance of liquation cracks in thick section welds in Al-Mg-Si alloy plate. TWI Journal 6(2):213–255
Yang YP, Dong P, Zhang J, Tian X (2000) A hot-cracking mitigation technique for welding high-strength aluminum alloy. Weld J 79(1):10–14
Mosneaga VA, Mizutani T, Kobayashi T, Toda H (2002) Impact toughness of weldments in Al-Mg-Si alloys. Mater Trans 43(6):1381–1389
Mosneaga V, Mizutani T, Kobayashi T, Toda H (2001) Experimental and analytical investigations of fracture toughness in weldments of 6082 Al Alloy. Mater T JIM 42(11):2386–2391
Huang C, Kou S (2004) Liquation cracking in full-penetration Al-Cu welds. Weld J 83(2):50–58
Huang C, Kou S (2004) Liquation cracking in full-penetration Al-Mg-Si welds. Weld J 112–116
Huang C, Kou S (2002) Liquation mechanisms in multi-component aluminum alloys during welding. Weld J 212
Huang C, Kou S (2001) Partially melted zone in aluminum welds planar and cellular solidification. Weld J 46–50
Huang C, Kou S (2000) Partially melted zone in aluminum welds—liquation mechanism and directional solidification. Weld J 113–120
Cao G, Kou S (2005) Liquation cracking in full penetration Al-Si welds. Weld J 64–70
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Manti, R., Dwivedi, D.K. & Agarwal, A. Microstructure and hardness of Al-Mg-Si weldments produced by pulse GTA welding. Int J Adv Manuf Technol 36, 263–269 (2008). https://doi.org/10.1007/s00170-006-0849-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00170-006-0849-z