ISSN:
1662-8985
Quelle:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Thema:
Maschinenbau
Notizen:
Authors tried to butt-weld a mild steel plate to a magnesium alloy plate by the solidstate welding using a rotating pin. This study investigated the effects of a pin rotating speed, theposition for the pin axis to be plunged (pin offset) on the strength and the microstructure of the joint.The main results obtained are as follows. Butt-welding of a steel plate to a magnesium alloy platewas easily and successfully achieved. The maximum tensile strength of a joint reached about 70%of the magnesium base metal tensile strength and the fracture path was along the joint interface.When a pin rotating speed was slow, some defects appeared in the magnesium matrix due to theinsufficient plasticization of the magnesium. The joint strength increased with the pin rotating speed.This seems to be because the plasticization of the magnesium was increased and the pressure forpushing the plasticized magnesium onto an activated faying surface of the steel increased. However,the excessive increase of the pin rotating speed caused the ignition of the magnesium, resulting inthe decrease of a joint strength. At the pin offset of 0.1mm toward steel, steel fragments scattered inthe magnesium matrix in the form of a small piece that had no influence to the joint strength. Bycontrast, larger offsets over 0.2mm produced the steel fragment continuous and parallel to the weldinterface in the magnesium matrix, and the joint strength decreased
Materialart:
Digitale Medien
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.393.pdf
Permalink
