The new sphere is made of iron as a default and placed in the center.

1. Select the sphere in the part list
2. Again, click on the list entry in the material field. A drop down box appears which offers several materials. Select air
3. Set the manipulation axis to z and the value to 1
4. Click on the "translate" button
5. Drag the slider beneath the axis. The spherical void moves into the weld. When it is inside, it appears on the X-ray image as a bright spot like the image below
   

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