PSI - Issue 39

4

Author name / Structural Integrity Procedia 00 (2021) 000–000

Paolo Ferro et al. / Procedia Structural Integrity 39 (2022) 120–127

123

z

v

a

c 1

x

c 2

b

adiabatic conditions

Fig. 2. Schematic of the geometrical parameters of the heat source

Table 1. Heat source parameters (*values varied according to table 2)

Q

Power Input (V·I) [W]

*

Efficiency

0.7

η

-

Q W

Absorbed power [W], with Q W = η Q

a b

0.5 3.5 0.5

Molten pool dimensions [mm]

c 1 c 2 f 1 f 2

3

0.6 1.4

Constants for the energy distribution of the heat flux

Welding speed [mm s -1 ]

v

10

Table 2. Process parameters investigated Trial Q [W]

v [mm s -1 ]

Heat Input (Q*/v) (J/mm)

1 2 3

7300 8300 9300

10 10 10

511 581 651

2.2. Peak stress method applied to residual stresses In local approaches, the weld toe is schematized, referring to the worst case, as a sharp V notch, zero tip radius, inducing an asymptotic stress field whose intensity is quantified by the NSIF, K I , given by Gross and Mendelson’s definition (1972) as follows:

(2)