Five welding technologies were investigated as possible solutions to the challenge of joining Mg alloys: Gas Tungsten Arc Welding, Electron Beam Welding, Magnetic Pulse Welding, Laser Assisted Friction Stir Welding and Resistance Spot Welding. The main influencing parameters have been analyzed, using the joint strength and microstructure to evaluate the welding processes. The advantages and difficulties for each technique are described and discussed. The microstructural changes that occurred during welding were examined by optical microscopy, and by scanning electron microscopy. Back-scattered electron imaging giving pronounced compositional contrast was used in combination with energy-dispersive and wavelength-dispersive spectroscopy microanalysis. Mechanical properties were determined by standard tensile tests on small-scale specimens, and by microhardness. The experimental results showed that defect-free welds could be obtained in similar and dissimilar magnesium alloys using all aforementioned welding techniques. These techniques hold good promise for industrial applications where reliable high quality joining methods are required. The present paper describes a part of a broader research program aimed at gaining a better understanding of the relationship between microstructure and mechanical properties and the welding technique, in Mg-alloy welded joints.
|Number of pages||6|
|State||Published - 21 Jul 2003|
|Event||2003 Magnesium Technology - San Diego, CA, United States|
Duration: 2 Mar 2003 → 6 Mar 2003
|Conference||2003 Magnesium Technology|
|City||San Diego, CA|
|Period||2/03/03 → 6/03/03|