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In 1956, Carl Johnson of Durox International in Luxembourg developed a method for cutting plastic shapes using a thin stream high-pressure water jet, but those materials, like paper, were soft materials. [4] In 1958, Billie Schwacha of North American Aviation developed a system using ultra-high-pressure liquid to cut hard materials. [5]
The methods used for dismantling and clearing structures underwater include hydraulic cutting, oxy-arc cutting, oxyacetylene cutting, Jackhammers, hydraulic breakers, explosives, non-explosive demolition agents (expanding grout), submersible diamond wire saws and ultra high pressure water jetting. [14] [15]
Robotic Hydrodemolition in Folkestone, UK. Hydrodemolition of concrete exposing the rebar.. Hydrodemolition (also known as hydro demolition, hydroblasting, hydro blasting, hydromilling, waterblasting, and waterjetting) is a concrete removal technique which utilizes high-pressure water, often containing an abrasive material, to remove deteriorated and sound concrete as well as asphalt and grout.
Ultra high pressure water jet cutters are used to cut a wide variety of materials including granite, concrete (see hydrodemolition), ceramics, fabric and even Kevlar. [15] One such cutter delivers 55,000 psi (380 MPa) through a nozzle 0.003 inches (76 μm) in diameter at 1 kilometre per second, which can cut a person at a close range.
A similar technology is the high pressure hybrid water-abrasive-ice jet treatment. Such technology is based on a high- pressure abrasive-water jet with addition of dry-ice pellets CO 2. Borkowski et al. [Bor03] show that effectiveness of surface treatment with the hybrid jet depends on the quality of ice particles.
English: Water jet cutter (head): 1 - high-pressure water inlet, 2 - jewel (ruby or diamond), 3 - abrasive (garnet), 4 - mixing tube, 5 - guard, 6 - cutting water jet ...
Oxygen arc cutting and arc welding underwater requires greater skill and stamina than working in a dry and stable environment. The underwater environment imposes several limitations and restrictions on both the equipment and the operator, and the restriction of short bottom times at greater depths for surface-oriented divers makes efficient working important to getting the job done in a ...
Hashish joined Flow Research Inc., now Flow International Corporation in Kent, Washington, U.S., as a research scientist, in early 1979.Although Flow was involved in waterjet cutting, mainly for mining and limited factory applications, it wasn't until Hashish invented a new technique to add abrasives to the waterjet that the strongest cutting tool in the world was realized. [3]
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