(1) The fatigue layer or defects on the surface of the roll body must be removed before surfacing, especially the cracks should be removed;
(2) During the overlay welding, in order to prevent the occurrence of cracks, the roll body of the roll must be preheated first, and the preheating temperature depends on the roll and the surfacing material;
(3) The key link of the success or failure of surfacing during welding. To obtain an ideal surfacing layer, certain variables must be considered, such as welding voltage, welding speed, roll speed, roll insulation, welding current, welding materials, etc. For some roll cores with high carbon and alloy elements, in order to prevent cracks in the brittle zone, in addition to certain preheating measures, low-carbon and low-alloy transition layers are mostly used for pre-surfacing welding transition layers.
(4) Slow cooling and turning after roll surfacing. In order to reduce cracks caused by volume stress caused by different surface and internal cooling rates, the cooling rate should be controlled. Finally, the roll after welding is turned to restore the original size and finish. And the performance of the roll after surfacing: 1) the service life of the roll after surfacing is generally more than doubled; 2) the cost per ton of steel is greatly reduced, and the production effect is improved; 3) the roll after surfacing has a good Crack resistance, abrasion resistance, cold and heat fatigue resistance.