Transition Layer Welding Materials of Fusion Welding Joint for Titanium-steel Explosive Composite Plate

The welding materials and processes of fusion welding joint for TA1-X80 explosive composite plate were designed by corresponding welding experiment. Based on the microstructure, composition and properties of the welded joints, a good welding material and process as transition layer for welding titanium-steel composite plate was obtained. The results show that Y-type groove and double-layer transition for metallurgical connection of titanium-steel composite plate are effective. The double-layer consists of nearly titanium layer of Ti-Ni-Al alloy and nearly steel layer of Ni-Cr-Fe alloy. The weld microstructure is changed from coarse equiaxed grain in the titanium layer to fine equiaxed grain or dendrite in the transition layer, and finally is interlaced with the structure of steel. The tensile and yield strength of the welded joint are 501.1MPa and 373.0MPa respectively, which reach the equal match. But the plasticity and toughness are slightly insufficient, which can be improved subsequently by reducing the thickness of the transition layer and adjusting the elements for refining grain size.