Successful repair of cold cracks on treiber roll: case study

Abstract

During preparing activities, as well as welding proces itself, it is necessary to strictly adhere to all relavant standards, programs and prescribed procedures. Experience can have a significant role for realization of repair welding, but it can also have the opposite effect. This fact (or ignorance) has led to the need for subsequent repair of cracks on the treiber roll. The previous claim is based on the fact that the treiber roll is made of S235J0 steel, whose characteristics (such as weldability) are not unknown, and inadequately measures that where taken led to the cold cracks occurance, which directly and indirectly caused huge losses. The reasons for cold cracks occurance were also explained in the paper itself. Steps for cold cracks repairing on the upper treiber roll of steel-mill sheet metal plant are also presented. Steps for repair welding with all parameters are described in order to eliminate defects caused by previous welding technology.