Fig. 1. Schematic of laser welding. (a) Groove; (b) welding

Fig. 2. Schematic of tensile and stress-rupture of samples at high temperature

Fig. 3. Macromorphology of welded joint

Fig. 4. Microstructures. (a) Weld zone; (b)(c) local magnifications of Fig.4(a)

Fig. 5. White particles in interdendritic zone

Fig. 6. Microstructure of HAZ of P92 steel

Fig. 7. HAZ of P92 steel. (a) CGHAZ; (b) FGHAZ

Fig. 8. Micro-hardness distributions of welded joints

Fig. 9. TEM images of martensite lath in CGHAZ of P92 steel. (a) Before heat-treatment; (b) after heat-treatment

Fig. 10. Tensile test results of welded joints. (a) Fracture position; (b) mechanical properties

Fig. 11. Microstructure of impact fracture. (a) Inconel 625 alloy; (b) welds; (c) P92 steel

Fig. 12. Tensile test of welded joints at high temperature

Fig. 13. Results of stress-rupture test at high temperature