ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Lap joining of A6111 alloy and steel (SPCC: Steel Plate Cold-rolled C) plates wasperformed using a defocused YAG laser beam. A detailed investigation was performed on theintermetallic compound (IMC) layer formed at the weld interface. Two representative jointsfabricated under different welding conditions were selected and the effect of the welding conditionson the kind and morphology of the IMC was investigated using a transmission electron microscope(TEM). An electron diffraction pattern method was used to identify IMC. It was found that themorphology and kind of IMC formed at the weld interface were strongly affected by the weldingconditions, in particular, by the amount of heat input during welding. The thickness of the IMC layerformed at the weld interface was about 1 μm and the average grain size of the IMC in the layer wasless than 300 nm when the joining was carried out with a small amount of heat input. The IMC layerwas composed of Fe3Al, FeAl, Al2Fe, Al5Fe2 and Al13Fe4 in this case. However, the thickness of theIMC layer was around 6 μm when the joining was carried out under high heat input conditions. In thiscase, the IMC layer was composed of coarse Al5Fe2 (5 μm) and Al13Fe4 (1 μm). Therefore, it isconsidered that the reduced bonding strength of the joint with a thick IMC layer is due not only to theoverall morphology of the IMC layer but also to the formation of coarse Al-rich IMCs in the layer
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1119.pdf
Permalink
