PSI - Issue 75

Lucrezia Contiero et al. / Procedia Structural Integrity 75 (2025) 609–615 Author name / Structural Integrity Procedia (2025)

611

3

AMed and WR, the joints were classified as dissimilar. Although only macroscopic weld dimensions were reported by the Authors, detailed weld bead geometry was reconstructed here by means of image analysis of the joint figures available in [2]. The collected geometric data are summarized in Table 2. A total of nine specimens were tested under cyclic axial loading with a load ratio R = 0.5. The crack initiation always occurred in the AMed part, while the failure condition has been defined at complete separation. It should be noted that neither Braun et al. (2023) nor Selmi et al. (2023) provide a detailed and unambiguous specimen-by-specimen description of the actual fracture location. Consequently, it will be assumed that fatigue failure systematically initiated at the weld toe in the AM side for all specimens.

Table 1. Manufacturing parameters and mechanical properties of the base materials employed in the full penetration butt welded joints made of 316L steel tested by Braun et al. (Braun et al. 2023) and Selmi et al. (Selmi et al. 2023).

Braun et al. (Braun et al. 2023)

Selmi et al (Selmi et al. 2023)

Technology

LPBF

LPBF

Renishaw AM 250 System

Machine

EOS M290

Power [W]

200

195

Speed [mm/s]

812.5

1083

Additive Parameters

Hatching space [mm]

0.11

0.09

Layer thickness [mm] Manufacturing strategy

0.04

0.02

Strips

-

Reorientation angle

67

-

Specimen Axis

Horizontal

Horizontal

Gas Metal Arc Welding

Gas Metal Arc Welding

Technology

Dinse DIX PI400

Machine

-

Power [W]

21.5

-

Speed [m/min] Ø at focal point [ μ ] Focal distance/surface [mm]

7.8

320

Welding parameters

1

1

600

-

Argon flow [L/min]

11

-

Full penetration butt joints Homogeneous (AM-AM)

Full penetration butt joints

Joint type

Dissimilar (AM-WR)

Joint configuration