The National Shipbuilding Research Program)Simultaneous 3-Edge Cleaning Methods and Tooling Evaluation
2006
Blomquist, Paul A.
Prepared in cooperation with Pennsylvania State Univ., State College, PA., Applied Research Lab.
Show more [+] Less [-]Equipment and technologies which could be used to simultaneously clean three surfaces of shipbuilding steels for subsequent welding operations have been surveyed. Two commercially available three-edge methods (closed circuit grit blasting and multiple-head wire bmshing) were evaluated. Five other methods were tested: laser beam stripping, high-pressure water blasting, high velocity oxy-fiel (HvOF) flame stripping, vacuum-shrouded needle-gunning, and carbon dioxide (CO2) bead blasting. Results of the survey are presented in a comparison table, and discussed in detail. For each method, production speed, approximate acquisition cost, consumables used, and environmental effects are considered. Where applicable, equipment was demonstrated at the manufacturer's or vendor's facility. A commercially available vacuum-recovery recirculating grit-blast unit was tested in a shipyard. The grit-blast unit was seen to be slower than manual grinding for three-sufface cleaning. A flat-surface recirculating grit blast head proved significantly faster than manual grinding in the cleaning of butt joint grooves fit for welding with ceramic backings. Cleaned surfaces were examined by Scanning Electron Microscopy (SEM). Safety, environmental, and ergonomic aspects were reviewed.
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