ABSTRACT
A review of general principles of the application of pre mixed abrasive water jet is also discussed, and that is widely used in different fields of the modern industry. Technical applications of ultra high pressure abrasive water jet are used with success for cutting steel ducts, even when these are reinforced with fibber systems or internal protection. The steel and reinforced elements can also be cut simultaneously with concrete structures. The use of tools specially developed to actuate in surface work locations and for cutting through walls ensure the success of this job. The new technology is an athermic system that does not generate heat, scrap, or gas, and this can be favorable for the stability of the base metal grains, as it is known that great energy can promote an adverse growth of these grains when temperature gets close to 1,038° C. The base metal grain growth is harmful as it weakens the metal that needs to be repaired. In this process, the elimination of the danger of an explosion results in better safety conditions, even though safety remains as a critical issue in the subsequent welding of the new segment. In this case, the effective use of the pre mixture abrasive water jet may provide better quality welding and greater safety for the new duct segment.
