Fig. 1. Trajectory chart of the stripe scanning. (a) Stripe scanning at 0°; (b) stripe scanning at 30°; (c) stripe scanning at 60°; (d) stripe scanning at 90°; (e) stripe scanning at 120°; (f) stripe scanning at 150°

Fig. 2. Trajectory chart of the checkboard scanning. (a) Checkboard scanning at 0°; (b) checkboard scanning at 45°; (c) checkboard scanning at 90°; (d) checkboard scanning at 135°; (e) checkboard scanning at 180°; (f) checkboard scanning at 225°

Fig. 3. Distribution diagram of temperature field and effective stress field (take a stripe scanning as an example). (a) Temperature field at 25 s; (b) temperature field at 50 s; (c) temperature field at 100 s ; (d) stress field at 25 s; (e) stress field at 50 s; (f) stress field at 100 s

Fig. 4. Distribution curves of temperature field and stress field at a point of simulation model. (a) Temperature curve; (b) effective stress curve; (c) stress distribution along height

Fig. 5. Comparison of residual stress after cooling of two trajectory simulation models

Fig. 6. Sample test diagram

Fig. 7. Forming sample stress testing platform

Fig. 8. Forming trajectory diagram. (a) Stripe scanning at 0°; (b) stripe scanning at 30°; (c) stripe scanning at 90°; (d) stripe scanning at 120°; (e) checkboard scanning at 0°; (f) checkboard scanning at 90°

Fig. 9. Cross sections diagrams. (a) P=160 W, V=400 mm/s, stripe; (b) P=160 W, V=500 mm/s, stripe;（d）P=160 W，V=500 mm/s，checkboard

Fig. 10. Comparison of residual stress test value

Fig. 11. Comparison of simulation and experimental results of the same process parameters