Pulsed Nd:YAG Laser Dissimilar Welding of Grade 2 Titanium Alloy to 3105-O Aluminum Alloy using AlSi5 Filler Metal
نویسندگان
چکیده
A special form of laser spot welding is introduced to overlap dissimilar welding of titanium (G2) to 3105-O aluminum alloy. A welding tactile seam tracking design using following pulses that result to a circular seam leads to spot like shape laser welding. This technique was conducted to joint overlapped grad 2 Titanium alloy (Ti G2) to 3105-O Al alloy, with 1, and 0.5 mm thicknesses respectively by using of AlSi5 filler metal with different (0.1, 0.16, 0.22) mm thicknesses. Different types of IMP were formed in the Ti-Al mixing zone. Weld zones in the side of Ti near Ti-Al interface are mainly formed from Ti3Al and TiAl. Microcracks are easily propagating throughTi3Al, forming longitudinal cracks. The AlSi5 filler metal has a positive effect on the weld Microstructure and thus joint strength, where Si has reduced the IMP (TiAl3) harmful effect via replacing Al atoms substitutionaly in TiAl3.
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