Researches on Corrosion Cracking Phenomenon That Occu Rs on Welded of Agricultural Equipment

I. Sărăcin University of Craiova, Faculty of Agriculture, Romania. G. Paraschiv, Polytechnic University of Bucharest, Romania. O. Pandia, I Bozgă, D. Toma University of Agricultural Sciences and Veterinary Medicine Bucharest, Romania Welded construction equipments for agriculture are strongly stressed in terms of mechanics, but also in terms of environmental action and thus in many cases appears their wear by corrosion cracking phenomenon. After research it was noted that after a certain period of use of equipment, metallographic structure of welded steel structures has changed substantially and at the same time a change in the chemical composition of steel was also observed. In terms of chemical composition a reduction in carbon content was mainly observed, and an increase in sulfur content, determined mainly by the presence of large quantities of sulfur in the atmosphere. This sulfur in the atmosphere at the same time determines the acid action on metallic materials, by forming with water from precipitation of H2S.