engleski

Application of WRC 1992 diagrams at dissimilar steels welding

Handling bulk and abrasive material is daily routine in the cement industry. At each production step beginning with quarrying of the raw material, the crushing and milling of the limestone up to the point of the calcination of the limestone, the cement manufacture components encounters tough wear conditions, resulting in significant abrasive wear. Abrasion is obviously the main wear phenomenon, however high temperature corrosion and fatigue may also accelerate the material degradation. Welding applications in this environment are mainly hardfacing applications of highly stressed components as well as weld-joining of broken parts. The choice of the optimal material for the specific application depends on the type of wear that occurs and on the plant component itself. Specially designed welding consumables and welding techniques are applied to meet the requirements of the different wear problems and different materials. In this article some typical repair jobs will be discussed. Examples will be the repair of a rotary kiln tire with special nickel base welding consumables and the hardfacing of typical crushing and milling equipment. Using optimal adapted welding consumables to those plant components establishes welding as a cost effective solution for a maintenance concept with long-term duty cycles in a cement plant.

cement; repair; welding; SMAW; flux cored wire; rotary kiln oven; vertical mill; crushing and milling equipment

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