Beltit SH – Dressing Weld On Mild Steel For Painting
Need to grind out a mig welded fillet with a belt file? Training at Abrasive Finishing Systems today included working with the Beltit SH variable speed powerfile machine. We were dressing a MIG weld on steel tubes and rails to prepare the welds for painting or powder coating.
Typically a P80 grit belt finish would be ideal for painting over mild steel tubing. Therefore we selected the FX87 80 grit ceramic belt for use on the Beltit SH machine. Using the variable speed Beltit meant that we had greater control of the cutting speed and also of the finish we could achieve on the work piece. On mild steel running at 80% of maximum speed (approx 7,000 rpm) gives increased control of the belts and a reduced the risk of the belts jumping and chewing the metal.
With the correct speed control an 80 grit ceramic belt gives excellent aggression in order to remove the weld quickly whilst leaving a finish that is consistent and fine enough for paint or powder coating.
Hints and Tips:
- To prevent chattering or gouging reduce the machine speed to ensure comfortable consistent working.
- Use all of the belt to your advantage; the wheel for shaping and the slack of the belt for dressing and finishing the curved faces around the weld.
- If you need a higher quality finish, use the medium surface conditioning belt after the FX87.
Take a look at how we got on below: