Oct 17, 2016 5. Grinding Weld and Mitre Joints on Structural Steels. Remove the weld beads from structural steel mitre joints using 60- to 150-grit zirconium fibre discs. Then use a drum sander with a 40- to 220-grit zirconium-blend belt. Use a template. Use a surface-conditioning belt for a fine finish. For a satin finish, use a 100-to 200-grit fine flap.
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