Fillet welds are widely used in profiles, large pressure vessels and KTY structures.For fillet welds with diversified structures, a dedicated fillet weld scanner is recommended for auxiliary scanning.On the one hand, the fillet weld scanner assists in data recording, facilitating subsequent data review and analysis.On the other hand, it maintains a constant scanning distance between the probe and the weld, which improves inspection efficiency while ensuring the accuracy of scanning data.

Probe and Scanner

       In this case, fillet joints with varying plate thicknesses are present at the inspection site, with a maximum thickness up to 77 mm. According to the actual workpiece conditions, a low-frequency D2 phased array probe paired with an angled wedge is adopted for shear wave oblique incidence testing. The probe and wedge are shown in Figure 1.

Figure 1 Phased array probe and wedge

Figure 2 Dopule MOS-02 Fillet Weld Scanner

Figure 2 shows the MOS-02 TKY fillet weld scanner used for inspection. The extended support rods stabilize the relative position of the scanner during operation, enabling smoother and more continuous scanning data acquisition.

Inspection Performance

       Inspections were carried out on fillet joints with different plate thicknesses on site, and the results are shown in Figure 3 to Figure 6.

Figure 3 Scanning and inspection result mapping of 38 mm-thick box fillet weld

Figure 4 Groove section drawing and scanning result mapping of 26 mm-thick weld

Figure 5 Scanning and inspection result mapping of 77 mm-thick inner box fillet weld

Figure 6 Scanning and inspection result mapping of 77 mm-thick outer box fillet weld

Conclusion

       The Doppler D2 series linear array probe combined with the MOS-02 scanner presents excellent inspection performance when testing this type of fillet weld.Doppler’s professional scanner team is capable of independently designing and developing a full range of scanners. Adopting a scanner tailored to the workpiece can double the inspection efficiency with half the workload.Doppler can also customize scanners of various specifications and dimensions according to customer demands, helping realize high-efficiency inspection.