Failure Analysis of Hydraulic Torque Wrench (Drive Shaft) - A Review

In this paper the essential factors required for failure analysis of square drive shaft of hydraulic torque wrench are taken into consideration and discussed in brief. This failure of square drive shaft is taken place due to twisting force acting on the area of square drive shaft during testing of this tool. Hydraulic torque wrenches are designed to handle the toughest bolting jobs accurately and quickly. All models provide a torque accuracy of +/- 3%. All models incorporate an easily reversible high grade alloy steel (DMR 1700) square drive enabling the operator to quickly switch from tightening to loosening applications. DMR-1700 steel is a material used in hydraulic torque wrench for structural applications that has been recently developed at Defence Metallurgical Research Laboratory by changing the chemistry of alloying elements. On the basis of studies by different techniques, DMR-1700 steel is recommended for the manufacture of components used in various systems in conjunction with the application of various defence service and power tool manufacturing. So in this paper the essential factors for failure analysis of square drive shaft of hydraulic torque wrench are discussed in brief.