Comparative study of hybrid laser–MIG leading configuration on porosity in aluminum alloy bead-on-plate welding

Laser–metal inert gas (MIG) welding is a promising welding technology, which presents many attractive properties. However, porosity still remains a serious problem in laser–MIG welding of aluminum. In this experimental study, the effect of leading configuration on porosity formation and distribution in laser–MIG bead-on-plate welding of A7N01 alloy was investigated. Experiments on arc current, welding speed, and arc configuration were performed comparatively for two leading configurations, respectively. The welds were analyzed with X-ray photographs and cross-section observations. Pores in laser–MIG-welded samples were mainly keyhole-induced. The concept of porosity area fraction was used to evaluate the severity of pore defect. The maximum porosity area fraction presented at different arc currents in the two leading configurations (in laser leading welding, it is 150 A, while in arc leading welding, it is 110 A). With welding speed increasing, porosity area fraction decreased. Bubble escape condition was deduced and used to discuss the probable mechanism of the effect of leading configuration on pore formation. The results showed that leading configuration was considerable in porosity minimization and prevention.

[1]  X. Shao,et al.  3D transient multiphase model for keyhole, vapor plume, and weld pool dynamics in laser welding including the ambient pressure effect , 2015 .

[2]  G. Casalino,et al.  Arc Leading Versus Laser Leading in the Hybrid Welding of Aluminium Alloy Using a Fiber Laser , 2013 .

[3]  Kezhao Zhang,et al.  Microstructure characteristics and mechanical properties of laser-TIG hybrid welded dissimilar joints of Ti–22Al–27Nb and TA15 , 2015 .

[4]  A. Fortunato,et al.  Hybrid laser-MIG welding of aluminum alloys: The influence of shielding gases , 2009 .

[5]  G. Casalino,et al.  Study on arc and laser powers in the hybrid welding of AA5754 Al-alloy , 2014 .

[6]  P. Peyre,et al.  Reduction of porosity content generated during Nd:YAG laser welding of A356 and AA5083 aluminium alloys , 2003 .

[7]  T. Chao,et al.  Keyhole collapse during high intensity beam drilling , 2014 .

[8]  F. Briand,et al.  Production of sound deep-penetration hybrid weld in aluminum alloy with YAG laser and MIG arc , 2006 .

[9]  O. Ola,et al.  Keyhole-induced porosity in laser-arc hybrid welded aluminum , 2015 .

[10]  P. Peyre,et al.  Influence of surface preparation and process parameters on the porosity generation in aluminum alloys , 2004 .

[11]  Chunming Wang,et al.  Study on laser-MIG hybrid welding characteristics of A7N01-T6 aluminum alloy , 2016 .

[12]  A. El-Batahgy,et al.  Laser Beam Welding of AA5052, AA5083, and AA6061 Aluminum Alloys , 2009 .

[13]  Seiji Katayama,et al.  Penetration and porosity prevention mechanism in YAG laser-MIG hybrid welding , 2007 .

[14]  G. M. Eboo,et al.  Arc augmented laser welding , 1979 .

[15]  Deyong You,et al.  Detection of imperfection formation in disk laser welding using multiple on-line measurements , 2015 .

[16]  Hui Chen,et al.  A characterization of microstructure and mechanical properties of A6N01S-T5 aluminum alloy hybrid fiber laser-MIG welded joint , 2016 .

[17]  T. Mohandas,et al.  Fusion zone microstructure and porosity in electron beam welds of an α+β titanium alloy , 1999 .

[18]  Hai-Lung Tsai,et al.  Effects of electromagnetic force on melt flow and porosity prevention in pulsed laser keyhole welding , 2007 .

[19]  P. Masson,et al.  Analysis of hybrid Nd:Yag laser-MAG arc welding processes. , 2011 .

[20]  Giuseppe Casalino,et al.  Effect of power distribution on the weld quality during hybrid laser welding of an Al-Mg alloy , 2015 .

[21]  Lin Li,et al.  The effects of short pulse laser surface cleaning on porosity formation and reduction in laser welding of aluminium alloy for automotive component manufacture , 2014 .

[22]  J. W. Kim,et al.  Porosity formation mechanisms in cold metal transfer (CMT) gas metal arc welding (GMAW) of zinc coated steels , 2016 .

[23]  D. R. White,et al.  Current issues and problems in laser welding of automotive aluminium alloys , 1999 .

[24]  Paul Kah,et al.  The effect of the relative location of laser beam and arc in different hybrid welding processes , 2009 .

[25]  Xiaoyan Zeng,et al.  Weld microstructure and shape of laser–arc hybrid welding , 2008 .

[26]  R. Burdzik,et al.  Disk Laser Welding of Car Body Zinc Coated Steel Sheets / Spawanie Laserem Dyskowym Blach Ze Stali Karoseryjnej Ocynkowanej , 2015 .

[27]  L. Zhao,et al.  Influence of welding parameters on distribution of wire feeding elements in CO2 laser GMA hybrid welding , 2009 .

[28]  P. Hilton,et al.  Thermal and Fluid Flow Characteristics and their Relationships with Porosity in Laser Welding of AA5083 , 2013 .