| Popis: |
The teeth of specialized excavators used in exploitation of magmatic rocks are made by forging from alloyed steels having 3.4%Mn, and the value of hardness less than 38HRC. The usual working time is about 15,000 hours.This paper estimates the possibility to make a structural hardening of the excavator teeth using the deposition by welding of hard layers. These hard layers are obtained by using the electrodes type Cr-W-V-Ti, having the hardness between 48 and 50HRC. In these conditions, the austenitic hard structures with complex carbides of W, V, Ti are developed.The presence of the hard layers on the active surfaces of teeth, deposited using an homologated technology, will allow to increase the life time of these components with minimum 30% in usually working conditions. |
