Abrasive water jet machining was introduced to manufacturing ten years ago and has been increasingly used for treating hard to machine and multi layered materials and as an alternative tool for milling turning drilling and polishing this is the first comprehensive review of the technique. In abrasive waterjet awj machining a waterjet is used together with abrasive particles at extremely high speeds for machining of composites through an accelerated micro erosion process water is pumped at high pressures through a nozzle to form a coherent stream flowing at high speeds 104. Principles of water jet cutting there are two types of water jet cutting processes pure water cutting in which the cutting is performed using only an ultra high pressure jet of clean water and abrasive water jet cutting in which an abrasive typically garnet is introduced into the high pressure stream. A water jet cutter also known as a water jet or waterjet is an industrial tool capable of cutting a wide variety of materials using a very high pressure jet of water or a mixture of water and an abrasive substance. The principles of abrasive water jet cutting are similar to pure water jet cutting but within the nozzle is a mixing chamber where the garnet is introduced abrasive cutting is typically used when cutting materials such as stainless steel aluminium stone ceramics and composites
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