Performance of work operations by a motor-grader is accompanied by action of asymmetrically applied external loading. As dissipative forces act between the wheels and the support surface, this force action leads to the grader deviation from the set trajectory of movement. The experimentally developed model of the vehicle behavior at performing work operations allows estimating indexes of road- holding ability depending on soil characteristics, geometric and kinematic parameters of the machine.
A categorization has been proposed of the welded joints depending on the type and character of loading and the needed safe- ty requirement of the structure of which they are an integral part. Four “production requirement grades”: “PRGs”, have been intro- duced. They allow the objective grading of welding requirements put forward towards the preparation of each and every welded joint for which the loading and operation conditions are familiar.