An Experimental Study on Effect of T-Joint’s Root Gap on Welding Properties

Abstract:

The aimed of this research is to investigate the effect of T-Joint’s root gap on physical and mechanical properties of weld metal. Low carbon steel were joined in T-joint types using MIG (Metal Inert Gas) with variation of root gap. The root gap used were 0 mm, 3 mm and 6 mm. The physical properties examined with chemical composition, microstructure and corrosion using optical microscope. The mechanical properties were measured with respect to the strength and hardness using Universal testing machine and Vickers Microhardness. The results show that the highest value found in welds with a gap of 3 mm with a value of 163.57 MPa. Hardness value is directly proportional to the tensile strength of the material. The highest value found in welds with root gap of 3 mm, followed by root gap of 6 mm, and 0 mm Hardness values in the welding area is higher than the parent metal and HAZ because the number of Si, Mn and Cu elements in the welding metals are bigger than base metal. Weld with all variation of root gap have a good corrosion resistance because the corrosion rate in welds with various root gap have a value below 0.02 mmpy. Microstructure of weld metals were Accicular ferrite, Widmanstatten ferrite, and grain boundary ferrite, while microstructure of base metal and HAZ were ferrite and perlite.

• Periodical: Applied Mechanics and Materials (Volume 863)
• Pages: 323-327
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.863.323
• Online since: February 2017
• Authors: Yustiasih Purwaningrum*, Panji Lukman Tirta Kusuma, Dwi Darmawan
• Keywords: Corrosion, Hardness, Microstructure, MIG, Root Gap, Tensile Strength, T-Joint

References

[1] R. Kumar, S. Kumar, Study of mechanical properties in mild steel using metal inert gas welding, Int. J. Res. Eng. Tech. 03(04) (2014) 751-756.

DOI: 10.15623/ijret.2014.0304133

[2] J. P. Ganjigati, D. K. Pratihar, A. R. Choudhury, Modelling of the MIG welding process using statical approaches, Int. J. Adv. Manuf. Tech. 35(2008) 1166-1190.

DOI: 10.1007/s00170-006-0798-6

[3] U. Usme, M. Bayramoglu, Y. Kazancoglu, S. Ozgun, Optimization of weld bead geometry in TIG welding process using greyrelation analysis and Taguchi method, Mater. Tech. 43(3)(2009) 143-149.

[4] S. C. Juang, Y. S. Tarng, Process parameters selection for optimizing the weld pool geometry in the tungsten inert gas welding of stainless steel, J. Mater. Proc. Technol. 122(1)(2002) 33-37.

DOI: 10.1016/s0924-0136(02)00021-3

[5] M. Vasudevan, A. K. Bhaduri, B. Raj, K. P. Rao, Genetic-algorithm-based computational models for optimising the process parameters of A-Tig welding to achieve target bead geometry in type 304 L(N) and 316 L(N) stainless steels, Mater. Manuf. Proc. 22(5) (2007).

DOI: 10.1080/10426910701323342

[6] D. Sugitani, M. Masahito Experimental Study on Effects of Root Gap and Fillet Size of Welds on Joint Strength, Quart. J. Japan Weld. Soc. 31(2013) 104-108.

DOI: 10.2207/qjjws.31.104s

[7] A. S. Babkin, Effect of the gap and welding conditions on weld dimensions, Weld. Int. 20(2006) 300-306.

DOI: 10.1533/wint.2006.3612

[8] A. E. Öberg, The Influence of Correct Transfer of Weld Information on Production Cost, In: Swedish Production Symposium, Linköping (2012), Sweden.

[9] A. E. Öberg, S. Wikstrand, V. Mattsson, Impact of gaps on resources efficiency in heavy welding industry, www. http: /publications. lib. chalmers. se /records/fulltext/240909/local_240909. pdf, accesed date 12 october (2016).

[10] H. H. Uhlig, Uhligs Corrosion Handbook, 2 ed. John Wiley& Sons Inc. New Jersey, (2000).