Abstract
Equipment and technologies which could be used to clean three adjacent surfaces of shipbuilding steels simultaneously in a single pass prior to welding operations have been surveyed. Seven methods were evaluated: closed-circuit grit blasting, laser beam stripping, high-pressure water blasting, high velocity oxy-fuel flame stripping, multiple-head wire brushing, vacuum-shrouded needle-gunning, and carbon dioxide bead blasting. A commercially available vacuum-recovery recirculating grit-blast unit was evaluated in a shipyard trial. 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. Surfaces produced by various cleaning methods were evaluated by visual examination and Scanning Electron Microscopy.
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