Bead-blasting

The relative importance of these factors can change considerably over time. For example, while "wet" stripping using aqueous solutions has been standard in the industry for many years, the high costs of sludge disposal, as well as the liability, have caused some shops to phase out aqueous stripping in favor of "dry" methods such as sand or bead blasting. 

Figure 12-10. Cumulative distribution of peak heights for bead-blasted aluminum surface for which the profilometric trace is shown at the top. The peak heights are with respect to an arbitrary datum below the surface the distribution is with respect to an envelope representing the of the surface. Scale shows the surface roughness of the...

Figure 12-18. Degree of contact for a hard spherical indenter pressed into the flat, rough surface of an unconstrained deformable body. The data divide into two classes. Homogeneous solids drawn rod aluminum, bead blasted A cold rolled aluminum, bead blasted cold rolled aluminum, bead blasted and then annealed Ygold, bead blasted and then annealed work-hardened turned copper. Degree of 0.007. Solids with hardened surface layers aluminum, bead blasted. Degree of contact ranged Data by Williamson and Hunt [16].

Surface texture restoration by mechanical means, such as sandblasting, glass bead blasting or micro-milling, provides a good but temporary treatment. 

This last experiment was carried out systematically by Fuller and Tabor in 1975. They used silicone rubber which was moulded into smooth glass concave lenses to produce spherical bodies which could be contacted with an acrylic plastic flat of varying roughness, prepared by bead blasting, as shown in Fig. 7.18. 

When PWR steam generators are to be replaced, the radionuclides deposited on the inner surfaces of the main coolant pipes represent a radiation source which may severely handicap the work therefore, the end sections at least have to be cleaned before starting the work. Decontamination of the relevant pipe sections by electrochemical techniques is a very effective means of removing the contamination layers and has been repeatedly applied. Mechanical procedures such as glass bead blasting have also proven highly effective in reducing the radiation levels in such limited areas. 

Standard Test Method for Measuring Deposit Mass Loading (Deposit Weight Density) Values for Boiler Tubes by the Gltiss-Bead-Blasting Technique... 

During bead-blasting operations where non-contaminated proeessing equipment parts are being eleaned... 

Cracks, glass bead blasted No cracks, glass bead blasted Cracks, eis machined No cracks, as machined HeatB ... 

Cracks, glass bead blasted No cracks, glass bead blasted... 

Any cleaning method may he impaired hy contamination or by lack of control. Results of a study in bleach plants suggest that pickhng and glass bead blasting can be more effective than stainless wire brushing and that brushing is more difficult to perform effectively in this case. 

Bead blasting, glass (cleaning) Subjecting a surface to bombardment by beads (usually glass) entrained in a high velocity gas flow to abrasively clean the surface. 

Glass bead blasting (cleaning) Grit blasting using glass beads. See also Shard. 

Shard A small fragment of a brittle material. Examples Glass shards in glass bead blasting glass shards formed when tempered glass is fractured. 

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