PSI - Issue 75

Martin Edgren et al. / Procedia Structural Integrity 75 (2025) 555–563 Martin Edgren et Al. / Structural Integrity Procedia (2025)

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The specimen is manually metallic arc welded using filler materialwith a diameterof 1.2 mm. The gusset plate is joint prepared with a 30-degree joint angle. Dual-pass welds are made, root and cap are extended in the corner where the gusset plate meets the main plate. The throat thickness is 5 mm. It is noted that no weld quality information was specified and communicated to the manufacturer prior to manufacturing of the specimen.

2.1 Mild notched specimens

A notch is introduced to the specimens, using a flat endmill with a diameter of 3 mm. The endmill is inclined at an angle of 30 degrees to the main plate, along the side where the gusset plate is joined and in the direct vicinity of the weld. The notch creates a smooth transition into the base plane towards the weld toe, hence the reference to a mild notch. At the weld toe, the edge of the shape created by the endmill and the transition between the weld and the parent material creates a sharp transition acting as a position for the crack initiation. Table 1. Depth of mild notches introduced to the specimens. Specimen

Notch depth Side 1 (mm)

Notch depth Side 2 (mm)

OB1 OB2 OB3 OB4 OB6

0.30 0.25 0.15 0.35 0.35

0.19 0.32 0.30 0.19 0.30

Winteria ® system was used to scan the welds, and the weld geometry datasets were used to evaluate notch depths. In the current setup the laser head moves linearly over the weld surface creating two-dimensional data with a speed of 5 mm/s. The scanning frequency is 100Hz giving geometrical data with section distances of 0.05 mm. In Figure 2 a) a photo of the area of interest is depicted and in Figure 2 b) a closeup of the plot over the evaluated position and crack depth is depicted. See Table 1 for recorded notch depths.

Figure 2 a) Photo of the evaluated area – notch position indicated by red arrow, b) Winteria ® scanned weld geometry section where notch depth is measured

2.2 Weld and HFMI treatment quality

The weld quality was evaluated before HFMI using both conventional visual testing (VT) and digital weld inspection using Winteria ® laser scanning system to assess the weld quality. It was observed that the weld quality varied between level C and B accordingto ISO 5817.The subsequent HFMI treatmentswere evaluated using VT and the treatment was assessed being in accordance with IIWs HFMI recommendations [5].