Fig. 1. Schematic of welding

Fig. 2. Tensile specimen

Fig. 3. Parameters of orthogonal experimental and tests results of RT detection

Fig. 4. Morphology of weld surface

Fig. 5. Cross section of welded joint and weld structure. (a) Cross section of welded joint; (b) base metal and heat-affected zone; (c) upper part of weld center; (d) upper part of right fusion line; (e) middle of weld center; (f) middle of right fusion line; (g) lower part of weld center; (h) lower part of right fusion line

Fig. 6. Tensile fracture of welded joint

Fig. 7. Cross section and dimple structure of tensile fracture. (a) Tensile fracture section; (b) partial enlarged view of Fig. (a); (c) tear edge and dimple structure

Fig. 8. Bending test results of welded joints

Fig. 9. Hardness curves of welded joints at different positions

Fig. 10. Weld solidification process and average grain size at different positions of weld. (a) Solidification process of welds^[16]; (b) average grain size and morphology of top, middle, and bottom of weld

Fig. 11. Phase diagram of weld. (a) Weld equilibrium phase diagram; (b) phase of Fe-Cr-Ni alloy solid phase line vertical section diagram^[20]

Fig. 12. Prediction of weld microstructure by Schaeffler phase diagram^[21]