51312-01442-Evaluation of Bristle Blasting Process for Surface Preparation of Commercial/Naval Ship-building Ste

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Product Number: 51312-01442-SG

ISBN: 01442 2012 CP

Author: Robert J. Stango

Publication Date: 2012

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Surface preparation of both commercial and naval ship steel is an important concern throughout the ship building and refurbishing community. To this end blast-cleaning processes are routinely used for corrosion removal and surface preparation prior to the application of protective paints and coatings. However blast cleaning processes are cumbersome and inevitably require special equipment containment systems and subsequent clean-up due to the widespread environmental contamination that is inherent of the process. At the same time alternate methods of corrosion removal such as needle gun/scaler tools are known to cause irreversible hand/wrist injury due to excessive exposure to vibration. Consequently there is a strong need to develop alternative surface preparation processes that forego the expense environmental contamination and risk of injury that is commonly associated with existing cleaning and surface preparation processes. In this technical paper an alternative surface preparation process termed bristle blasting is presented which simultaneously removes corrosion and generates a surface profile that is equivalent to commercial grit blasting processes. Specifically performance of the bristle blasting process is examined within the context of structural steels that are commonly used in the ship building community including ABS-A AH-36 HSLA and HY-80 which together comprise the mainstay of steels that are used in commercial transportation and naval/national defense applications. Results are reported that summarize the most recent findings for cleanliness and texture performance that can be achieved for both base metal materials and welded joint applications. At the same time surface and subsurface modification of the bristle blasted region is examined in order to help assess the plastic deformation and residual stress state that is imparted to the steel during the surface preparation process. These results collectively are used for assessing the suitability of introducing bristle blasting tool technology for cleaning/texturing steels that are peculiar to this industry.