Analysis of Skills Needs in Repair Welding of Low-Alloy, High Tensile Steels Using the Manual Metal Arc Welding (MMAW) Process
Keywords:
Electrode, Low-Alloy High tensile Steel, Manual Metal Arc Welding (MMAW), Repair Welding, Skills Gap, Tamale Metropolis.Abstract
There is actually critical skills gap in repair welding of low-alloy, high tensile steels among welding craftsmen within the Tamale metropolis. A skills gap is perceived to be the difference between the skills needed and the skills already acquired. This study seeks to analyze the skills gap in the repair welding of low-alloy, high tensile steels component parts in the informal sector within the metropolis, especially when using the MMAW process. A total of 120 questionnaires including structured interview were then administered to welding craftsmen. However, 111questionnaire were returned, representing a response rate of 92.5%. Welders perceive that a lot of repair welding is present in both automotive and structural steel industries (87.7%). The study was posed to determine whether welders were able to make the right choice of electrode for low-alloy steel welding. Also to find out whether level of education of the welder or age in the profession influences one’s ability to weld low-alloy steel successfully. The study revealed that those who could not identify the right electrode for low-alloy steel welding were at the higher side. The inferential statistics output indicated that quality of weld is independent of level of education, likewise age in the welding profession. It is therefore recommended that artisanal training be organized for welding craftsmen within the metropolis in order to address this critical gap. Education institutions could take up this challenge to ensure that they offer the requisite skills to this category of welders who had not passed through technical education. It is also recommendable to ensure that repair welding of alloy steels in its entirety be given a place in the technical curriculum.
References
[2]. ASTD (2012). The American Society for Training & Development, Bridging The Skills Gap, Help Wanted, Skills Lacking: Why the Mismatch in Today’s Economy? ASTD Press, 1640 King Street, Box 1443, Alexandria.
[3]. Davies, A.C. (1992). The Science and Practice of Welding, Tenth Edition, process? process? Process?Cambridge University Press, Cambridge.
[4]. Leake, K. and henthorne, N.J. (1968). Welding Science and Metallurgy, Rockwell pub. American welding society.
[5]. ASM Handbook (2013), Volume 4A: Steel Heat Treating Fundamentals and Processes ASM International, available @ ASM International,2006, accessed on 10th November, 2014).
[6]. Yi, H.J., Lee, Y.J., Kim, J.Y., Kang, S.S., 2011. Effect of microstructure and chemical composition on cold crack susceptibility of high-strength weld metal. J. Mech.Sci.Technol. 25, 2185–2193.
[7]. Paradowska, A., Price, J.W.H., Ibrahim, R., Finlayson, T., 2005. A neutron diffractionstudy of residual stress due to welding. J. Mater. Process. Technol. 164/165,1099–1105.
[8]. Chunguo Zhanga, Pengmin Lua, and Xiaozhi Hua (2013). Residual stress and softening in welded high-strength low-alloy steelwith a buffering layer. Journal of Materials Processing Technology.
[9]. Wheatley, G., Hu, X.Z., Estrin, Y., 1999. Effect of a single tensile overload onfatigue crack growth in 316L steel. Fatig. Fract. Eng. Mater. Struct. 22,1041–1051.
[10]. Zhang, Y.Q., Zhang, H.Q., Li, J.F., Liu, W.R., 2009. Effect of heat input on microstructureand toughness of coarse grain heat affected zone in nb microalloyed hsla steels.J. Iron Steel Res. Int. 16, 73–80.
[11]. Jeffus, L. (1993).Welding Principles and Applications, 3rd Edition, Delmar Publications Inc. USA.
[12]. Duchosal, A., Deschaux-Beaume F., Bordreuil C., Fras G. and Lours P.(2008).Science and Technology of welding and joining. Volume 13 issue 2. Published online: 04 Dec 2013.
[13]. IAEA (2001).Guidebook for the Fabrication of Mon-DestructiveTesting (NDT) Test Specimens, Industrial Applications and Chemistry Section, International Atomic Energy Agency Wagramer Strasse 5 P.O. Box 100 A-1400 Vienna, Austria.
[14]. API (1999).Standard 1104 Nineteenth Edition, September 1999 Errata 1, October 31,2001.
[15]. Schoefer, E. A. (2004). Steel Castings Handbook Supplement 7,Welding of High Alloy Castings. Steel Founders' Society of America.
[16]. GSS (2011). Ghana Statistical Service, Accra, Ghana. 2010 Population and Housing Census. Summary Reports of Final Results.
[17]. Gall, M. D., Gall, J. P., & Borg, W. R. (2003). Educational research: An introduction (7th Ed.). Boston: Allyn & Bacon.
[18]. Majiyagbe, O. D. (2009). Work Skill Needs of Fabrication and Welding Craftsmen As Perceived By Related Industries In Kaduna State.
[19]. Krejcie, V. Robert, and Morgan, W. Daryle (1970). Determining Sample Size for Research Activities, Educationaland Psychological Measurement 1970, 30, 607-610.
[20]. Uzoagulu, E.A. (1998). Practical Guide to Writing Research Project Reports in Tertiary Institutions. Enugu: John Jacobs’s classic publisher’s limited.
[21]. Ary, D., Jacobs, L.C. & Razavieh, A. 2002. Introduction to research in education (6th Edition.). Belmont: Wadsworth/ Thompson
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