Water Jet Machining (WJM)
3.3.1 Introduction
High pressure water was used in hydraulic mining in the mid of 1800s. A low pressure water jet nozzle is used for cutting soft materials like paper by paper patents company in 1933. A high pressure water jet was used for cutting plastic by Carl Johnson of Durox International in Luxembourg in 1956. An ultra-high pressure (6900 bar) liquid delivering system to produce hypersonic jet was used to cut stainless steel by B. Schwacha of North American Aviation in 1958. A pulsating water jet was used to cut metals and stone by Philip Rice of Union Carbide in 1962. In the mid of 1960s traditional coal water jet cutting was extended to high pressure water jet cutting of stone by suitable ...
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