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Degradation analysis of materials in agriculture
 Sriwongras, Piyapong
The present dissertation deals with the application of acoustic emission testing (AET) as one of the non-destructive testing to identify the quality of metal materials used in agricultural technology. Experimental study is divided into two parts. The first part is the use of AET in welding by Cold Metal Transfer (CMT). The quality of the welding process and the welded specimens is evaluated, especially in corrosion and mechanical degradation. Second part is devoted to magnesium alloys which are currently being used in the automotive industry and have the potential utilization in specific agricultural applications as well. Research in this area is focused on the evaluation of high-cyclic fatigue at different stages of corrosion degradation of magnesium. The problems of weldability of the material are solved. Attention is also focused on the CMT welding of two dissimilar materials, especially in AZ31B magnesium alloy and EN AW 6065 aluminum alloy, further DX51D galvanized steel and aluminum alloy. Results declare a way to use AET for qualitative evaluation of the welding process and process of mechanical and corrosive degradation of specimens. The efficiency of AET during the cooling phase after welding was demonstrated. These records are used to optimize the welding process. The mechanical resistance of the specimens with and without corrosion in tensile and fatigue tests was detected and visualized by means of AET. The high-frequency pulsator was used for practical evaluation of the quality of magnesium alloys under dynamic loading. The degree of reduction of fatigue life due to corrosion degradation was visualized by application of AET. The work presents the applicable results of using AET in the qualitative evaluation of innovative materials during mechanical and corrosive degradation as well as during the welding process. Therefore, the sense of this work is to deepen knowledge about the potential of modern approaches for qualitative assessment in order to identify new areas of specific material application, improving production quality and safety as well as reducing costs. The work was supported by the Internal Grant Agency AF MENDELU.
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