Fig. 1. Welded joints of high-strength stainless steel car bodies. (a) Resistance spot welding; (b)--(d) laser welded external and internal plates and weld shape^[4]

Fig. 2. Elimination mechanism and effect of hump defect during high-speed laser welding with double beams. (a)(b) Flow behavior of molten pool and photo of weld surface; (c)(d) schematic for double beams suppressing hump^[8]

Fig. 3. Fusion ratio of Inconel600 in dissimilar laser weld metal between nickel based alloy Inconel600 and stainless steel S347^[13]. (a) 100%; (b) 16%; (c) 36%; (d) 55%; (e) 0

Fig. 4. Laser joining of laser textured low-carbon steel and CFRP^[16-17]. (a) Schematic; (b) tensile curves

Fig. 5. Relationship between porosity tendency and heat input during laser welding of die cast magnesium alloy with different laser power density values^[23]

Fig. 6. Effect of welding position on porosity^[27-28]. (a) Porosity with low power and low speed; (b) porosity with high power and high speed

Fig. 7. Laser welded joint of ultra low carbon bainitic steel ^[39]. (a) Microstructure of CGHAZ; (b) tensile strength at room-temperature; (c) impact toughness at -40 ℃

Fig. 8. Repair of FV520B stainless steel by laser cladding^[45]. (a)-(d) Microstructures of cladding layer, remelted region, tempered region, and quenched region; (e)(f) macrographs of cladding layer before and after laser heat treatment; (g)(h) fracture morphologies before and after laser heat treatment

Fig. 9. Laser surface heat treatment of duplex stainless steel^[47]. (a)-(c) Microstructures of duplex stainless steels 2304, 2205, and 2507; (d) schematic of laser surface heat treatment; (e) relationship between austenite ratio and corrosion pitting temperature