Abstract
To regulate the inhomogeneous interfacial reaction during laser welding-brazing of Ti/Al dissimilar alloys, an advanced method of dual laser-beam bilateral synchronous welding-brazing was proposed. The formation mechanism of the intermetallic compounds (IMCs) with various dual laser-beam input was analyzed. The experimental results revealed that sound brazing joints with homogeneous serrated-shaped IMCs along the Ti/Al interface were obtained when the laser power on both sides is the same. An interesting phenomenon can be found that the thickness of IMCs layer on both sides is thicker than the middle. The highest bonding strength of Ti/Al butt joints could reach up to 71% of aluminum alloy base metal due to homogeneous serrated-shaped IMCs with a thickness of 3–4 μm.
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