Abrasive Water Suspension Jets (AWSJs) are a complementary development to Abrasive Water Injection Jets (AWIJs) in water jet technology. Whereas AWIJs are easily generated by the adaptation of a cutting head on the water nozzle, the abrasive addition at AWSJs takes place at working pressure. This demands higher constructive expenses and leads to longer switching times. On the other hand the jet generated only consists of the phases water and abrasive and is more efficient and stable. These differences lead to the fact that AWSJs are not used for machining purposes, but are very efficient for cutting tasks under difficult conditions leading to their specific application fields in the decommissioning and dismantling of offshore structures and nuclear power plants as well as in demilitarisation. By selection of the suitable parameters (pressure, flow rates, traverse rate) the properties of AWSJs can be fitted to the specific application optimised towards the desired target parameter. Although the development tends to the increase of pressure and the reduction of flow rates and energy, a level of 200 MPa seems to be a reasonable limit. This is due to the difficult handling of the fine abrasive particles and the over-proportionally increasing costs of the high pressure components. New developments of the implementation of polymers in abrasive water suspension technology will allow enhancing the cutting potential. This will not only be in terms of cutting velocity and cutting depth, but also in terms of independency of the standoff distance as well as the complexity of structures to be cut.
Abrasive water suspension jet technology fundamentals, application and developments
Welding in the World ; 51 , 9/10 ; 11-16
2007
6 Seiten, 8 Bilder, 1 Tabelle, 7 Quellen
Aufsatz (Zeitschrift)
Englisch
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