The Paton Welding Journal, 2009, №05



2009 №05 (05)

2009 №05 (07)

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TPWJ, 2009, #5, 27-33 pages  
INFLUENCE OF JOINT GEOMETRY AND FIT-UP GAPS ON QUALITY OF CORNER JOINTS IN NEW MODIFIED SHORT ARC GMAW


Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                       0957-798X (print)
Issue                       № 5, 2009 (May)
Pages                      27-33
 
 
Authors
P. KAH¹, J. MARTIKAINEN¹, P. JERNSTROM² and J. UUSITALO^2
1Lappeenranta University of Technology, Lappeenranta, Finland
²Kemppi Company, Lahti, Finland
 
 
Abstract
The effect of process parameters on the fit-up gaps in new modified short arc gas metal arc welding (GMAW) and the conventional short arc GMAW for steel plates is described. The modified short arc GMAW offered a number of advantages over the conventional short arc GMAW of fillet weld between two sheet plates in a corner joint in vertical downward welding direction. It was found that a higher welding speed and a smaller HAZ are reached using less energy with the modified short arc GMAW than with the conventional GMAW process. It was noticed that the modified short arc GMAW possesses approximately 25 % less heat input than the conventional GMAW, and modified short arc is 10 % faster than in conventional GMAW.
 
 
Keywords: modified short arc GMAW, conventional GMAW, root gap, sheet metals, torch angle, electrode extension, joint quality
 
 
Received:                10.02.09
Published:               28.05.09
 
 
References
1. Kah, P.C., Martikainen, J. (2007) Welding of sheet metal using modified short arc MIG/MAG welding process (Fast-ROOT). In: Proc. of 3rd Int. Conf. on Total Welding Management in Industrial Application (Lappeenranta, Finland).
2. Uusitalo, J. (2007) Modified short arc process - a new way of welding root passes. Ibid.
3. Murugan, V.V., Gunaraj, V. (2005) Effect of process parameters on angular distortion of gas metal arc welded structural steel plates. Welding J., 11, 165-171.
4. Howard, B.C. (2002) Modern welding technology. 5th ed. AWS, 123, 134, 135, 142, 151, 193.
5. Uusitalo, J. (2008) The WiseRoot welding process for root passes welding. In: Proc. of Symp. on Joining of Materials (2008), 109-117.
6. Zhang, G.J., Chen, S.B., Wu, L.J. (2005) Intelligent control of pulsed GTAW with filler metal. Welding J., 9-15.
7 EN 10112-1: Welding recommendation for welding of metallic materials.

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