Fig. 1. Schematic of electromagnetic assisted laser hot wire narrow-gap welding process

Fig. 2. Sampling position and dimension of tensile sample

Fig. 3. Cross-sectional morphologies of laser hot wire narrow-gap weld and molten pool morphologies. (a) Conventional laser welding (CLW); (b) laser-beam wobble welding (LWW); (c) electromagnetic assisted laser beam wobble welding (EMLWW)

Fig. 4. Temperature distribution of single narrow-gap welding. (a) Positions of thermocouples; (b) temperature curves of thermocouple 1; (c) temperature curves of thermocouple 2

Fig. 5. Analysis of narrow-gap melt pool. (a) Interface energy at gap walls of narrow-gap welding; (b) flow behavior of melt pool under electromagnetic field

Fig. 6. Microstructures of welded joint obtained by CLW. (a)(b) Weld bottom and its enlarged picture; (c) weld fusion zone; (d) overlapped weld zone; (e)(f) weld center and its enlarged picture

Fig. 7. Microstructures of welded joint obtained by EMLWW. (a) Weld bottom; (b)(c) weld fusion zone and enlarged picture; (d) overlapped weld zone; (e)(f) weld center zone and its enlarged picture

Fig. 8. Tensile strength of narrow-gap welded joints obtained at various welding parameters

Fig. 9. Tensile fracture of narrow-gap welded joint obtained at different welding parameters. (a) CLW; (b) LWW; (c) EMLWW

Fig. 10. Electrochemical corrosion polarization curve of narrow-gap welded joints

Fig. 11. Impedance spectroscopy of narrow-gap welded joints. (a) Nyquist figure; (b) Bode figure