Fig. 1. Schematic of welding process

Fig. 2. Shape and size of tensile specimen

Fig. 3. Cross-sections of weld before and after adding copper interlayer. (a) Before adding; (b) after adding

Fig. 4. Tensile strength of joint as a function of thickness of copper interlayer

Fig. 5. Micro-morphology of Mg/Ti welded joint after adding 10-μm-thick copper interlayer. (a) Cross section of joint; (b) interface area; (c) enlarged view of dotted box in Fig. 5(b); (d) results of EDS line scanning

Fig. 6. Micro-morphology of Mg/Ti welded joint after adding 20-μm-thick copper interlayer. (a) Interface area; (b) enlarged view of dotted box in Fig. 6(a); (c) results of EDS line scanning

Fig. 7. Relationship between components and enthalpy of formation

Fig. 8. Micro-morphology of Mg/Ti welded joint after adding 30-μm-thick copper interlayer. (a) Interface area; (b) enlarged view of dotted box in Fig. 8(a); (c) results of EDS line scanning

Fig. 9. Micro-morphology of Mg/Ti welded joint after adding 50-μm-thick copper interlayer. (a) Interface area; (b) enlarged view of dotted box in Fig. 9(a); (c) results of EDS line scanning

Fig. 10. Micro-morphology of Ti-side tensile fractures of Mg/Ti welded joints after adding copper interlayers with different thicknesses. (a) 10 μm; (b) 20 μm; (c) 30 μm; (d) 50 μm