Indian Welding Journal

Open Access Open Access  Restricted Access Subscription Access
Open Access Open Access Open Access  Restricted Access Restricted Access Subscription Access

Influence of AC frequency, current and stand-off distance on bead profile in AC TIG welding of aluminium


     

   Subscribe/Renew Journal


Using Gas Tungsten Arc Welding, or TIG Welding, good quality weld can be obtained. In this process, a shielding Gas is used to avoid atmospheric contamination of the molten weld pool. In the present worl<, bead profile In aluminium worl<piece is observed as welded by AC TIG welding under 100% argon gas shield. Effects of variation of arc frequency, current and stand-off distance on bead profile are investigated. In the experiment, the bead-on-plate welding of 14 treatments is performed on Al 1000 series aluminium plates without a filler wire utilizing Central Composite Design system of Response Surface Methodology (RSI'I). Gas pressure is maintained at 2 l<g/cm" with gas flow rate of 15 litymin, welding speed of 100 mm/min, electrode diameter of 3 mm and wave balance of -25. From this investigation, it is observed that an increase in welding current increases weld penetration. These are caused by the increase in heat input with the increase in weld current and decrease In torch travel speed. An increase in stand-off distance is also observed to cause a decrease in weld penetration. Analysis of variance (ANOVA) is also performed on the observed results. Regression equations are formed relating the response to the factors (independent variables). Linear relationships are found to be quite significant for both
the cases of penetration and weld bead width. Acceptable correlation coefficients (R2) more than 95% are obtained in case of depth of penetration and more than 99% in case of bead width Indicating effectiveness of the results observed.


Keywords

Welding, GTAW; Aluminium, Bead-on-plate, AC frequency.
User
Subscription Login to verify subscription
Notifications
Font Size

  • Kinsey, B. and Viswanathan, V. and Cao, J. (2001); Forming of aluminum tailor welded blanks, SAE Technical Paper

  • Tusek J., Kampus Z. and Suban M. (2001); Welding of tailored blanks of different materials. Journal of Materials Processing Technology, 119, pp.180-184.

  • Arunkumar D. and Subbaiah K. (2019); Effect of Continuous and Pulsed Current Tungsten Inert Gas Welding of Cast Al-Mg-Sc Alloy, Springer Nature Singapore PteLtd, pp. 653-662.

  • Ding D. and Wang Y. W. (2013); Effaets of post weld heat treatment on properties of variable polarity TIG welded AA2219 aluminium alloy joints. Transactions of Nonferrous Metals society China, 24, pp. 1307-1316.

  • Kumar T. S., Balasubramanian V. and Sanavullah M. Y. (2006); Influences of pulsed current tungsten inert gas welding parameters on the tensile properties of AA 6061 aluminium alloy, Materials and Design, 28, pp. 2080-2092.

  • Reddy G. M., Gokhale A. A. and Prasad l^o K. (1997); Optimisation of pulse frequency in pulsed current gas tungsten arc welding of aluminum-lithium alloy sheets. Materials Science and Texhnology, 14, pp. 61-66.

  • Lothongkum G., Chaumbai P.and Bhandhubanyong P. (1999); TIG pulse welding of 304L austenltic stainless steel In flat, vertical and overhead positions. Journal of Materials Processing Technology, 89-90, pp. 410-414.

  • Guang-jun Z., Zhi-hong Y. and Lin W. (2006); Visual sensing of weld pool in variable polarity TEG welding of aluminum alloy. Transaction Nonferrous Metals Society China, 16, pp. 522-526.

  • Mohan P. (2014); Study the effects of welding parameters on TIG welding of aluminum plates, A thesis submitted to Department of Mechanical Engineering National Institute of Technology Rourkela

  • Potluri N.B., Ghosh RK. and Gupta RC. (1996); Studies on weld metal characteristics and their influence on tensile and fatigue properties of pulsed - current GMA welded Al- Zn-Mg alloy. Welding Journal, 75, pp. 62-70.

  • Ghosh, N. and Das, S. (2019); Study on effect of welding parameters on weld bead geometry of AC TIG welding in aluminium. Manufacturing Technology Today, Vol. 18, No.9, pp.30-38.

  • Ming, L. Q., Xin-hong, W., da, Z. Z. and Jun, W. (2007); Effect of activating flux on arc shape and arc voltage in tungsten inert gas welding. Transaction Nonferrous Metals Society China, 17, pp. 486-490.

  • Morisada Y, Fujii H., Inagaki F. and Kama! M. (2013); Development of high frequency tungsten inert gas welding method. Materials and Design, 44,pp. 12-16.


Abstract Views: 171

PDF Views: 5




  • Influence of AC frequency, current and stand-off distance on bead profile in AC TIG welding of aluminium

Abstract Views: 171  |  PDF Views: 5

Authors

Debabrata Roy
, India
Santanu Das
, India

Abstract


Using Gas Tungsten Arc Welding, or TIG Welding, good quality weld can be obtained. In this process, a shielding Gas is used to avoid atmospheric contamination of the molten weld pool. In the present worl<, bead profile In aluminium worl<piece is observed as welded by AC TIG welding under 100% argon gas shield. Effects of variation of arc frequency, current and stand-off distance on bead profile are investigated. In the experiment, the bead-on-plate welding of 14 treatments is performed on Al 1000 series aluminium plates without a filler wire utilizing Central Composite Design system of Response Surface Methodology (RSI'I). Gas pressure is maintained at 2 l<g/cm" with gas flow rate of 15 litymin, welding speed of 100 mm/min, electrode diameter of 3 mm and wave balance of -25. From this investigation, it is observed that an increase in welding current increases weld penetration. These are caused by the increase in heat input with the increase in weld current and decrease In torch travel speed. An increase in stand-off distance is also observed to cause a decrease in weld penetration. Analysis of variance (ANOVA) is also performed on the observed results. Regression equations are formed relating the response to the factors (independent variables). Linear relationships are found to be quite significant for both
the cases of penetration and weld bead width. Acceptable correlation coefficients (R2) more than 95% are obtained in case of depth of penetration and more than 99% in case of bead width Indicating effectiveness of the results observed.


Keywords


Welding, GTAW; Aluminium, Bead-on-plate, AC frequency.

References





DOI: https://doi.org/10.22486/lwj.v56%212.221110