After shot blasting, structural steel components often require some cleaning. The degree of cleaning depends on the work piece’s condition prior to processing as well as machine set-up.
This installment of our Structural Steel FAQ series will answer How are residual blast media and dust removed from shot blasted steel components?
Why Remove Residue
Ancillary machine attachments and processes may be required to remove blast media and dust resting on structural steel components to ensure surfaces are properly prepared for painting and coating.
The need for a clean and well-prepared surface after shot blasting mirrors that of the pieces surfacing in the first place as discussed in Part 1 of this series.
Methods of Removal
Practically all plate and profile roller conveyor shot blast machines are equipped with a media brush-off system at the machine exit. By adding a rotary brush at the end of the process, residue is removed as the work piece exits the machine.
Many times, the brush unit is augmented by a blow-off system with one or multiple radial fans to ensure there are no “dead zones” where residue remains.
Monitoring the Work Piece
To account for different work piece dimensions, a photo cell is often included in the machine. This allows the machine to monitor the height of work pieces and automatically move brush- and blow-off units to accommodate variations in size.
The Rosler Way
Be sure to catch up on our previous posts in the series including:
- Part 1 – Why Surface Preparation is Necessary
- Part 2 – Methods of Surface Preparation
- Part 3 – Evaluating Rust and Mill Scale Pre- and Post-Blast
- Part 4 – Evaluating the Presence of Dust
- Part 5 – Assessing Surface Profile
- Part 6 – Blast Media’s Influence on Surface Profile
- Part 7 – Comparing Commonly Used Blast Machines
- Part 8 – Are All Turbines Created Equal?