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EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURES IN A 36 REPAIR BUTT WELDMENT | ||
| Iranian Journal of Science and Technology Transactions of Mechanical Engineering | ||
| مقاله 12، دوره 38، M2، دی 2014، صفحه 431-438 اصل مقاله (631.32 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijstm.2014.2506 | ||
| چکیده | ||
| Welding is one of the usual assembling methods with various applications. The different defects are generated during welding and also in service conditions. After inspection and identifying the defects, the repairs are applied. Welding repair operation causes the mechanical properties and the microstructures of weldment to change. In the present work the variations of yield stress, hardness and microstructures in the A 36 repair butt specimens were investigated by the experimental study. The welding technique was Tungsten Insert Gas method without using filler. The specimens were cut from the welded plates using water jet method for avoiding heat effect during the cutting. The low-carbon steel A 36 thin plate was used to construct the specimens. This material has numerous applications to construct various structures and parts. The specifications of specimens and tests were selected according to the standards. The tensile tests were performed for four numbers of each specimen. The mean of yield stresses in the specimens were reduced after the repairing through half- thickness of the butt welds. Moreover, the mean of yield stresses in the specimens after repairing would be decreased if the welding voltage and current increased. Reduction of the hardness in heat affected zone and variation of the phases and grain size after repairing were other outcomes from testing on the specimens. | ||
| کلیدواژهها | ||
| Experimental tests؛ repairing weld؛ gas tungsten arc welding؛ yield stress؛ hardness؛ Microstructures | ||
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