PSI - Issue 54

3024_2steps

Paulo Mendes et al. / Procedia Structural Integrity 54 (2024) 340–353 Mendes et al. / Structural Integrity Procedia 00 (2023) 000–000

344

5

A → B →

Fig. 2. Vickers hardness profile for the J30 welded joint with root steps. 3024_full

A →

B →

Fig. 3. Vickers hardness profile for the complete J30 welded joint.

Inbotha ffi liations, the hardness is higher in the weld material zone than in the base material. According to Table 1, the filler material used in the welding process has a lower carbon content and a greater nickel percentage than the base material, implying that ductility is improved. Ductility refers to a material’s ability to undergo plastic deformation and absorb more energy before fracture, allowing it to more e ff ectively disperse stress and resist crack propagation. The changes that have occurred can be confirmed when performing the final steps in the complete welded joint, as demonstrated in Figure 3. In the a ffi liation B, the hardness results show less variation and more of a straight-line behavior, indicating that the heat input from the last steps directly influenced the mechanical properties of the initial steps. The thermal exposure from the top steps is su ffi cient to provide a tempering heat treatment to the preceding steps in a ffi liation B, significantly lowering the hardness values. Additionally, the welding process parameters for the