| Abstract [eng] |
In this Master thesis research work, submerged arc welding technique was used to deposit the hard metal on the plain carbon steel base metal. In this research work it was on investigating the flux influence on weld material. Checking their hardness, their resistance to wear, microstructural changes in the structure. Original flux was prepared with silicon carbide, silicon oxide and 50% silicon oxide and 50% silicon carbide. For other half of the specimen along with the flux we use HSS mixture as an alloying element. Once the weld is done the specimens are checked for their hardness and the numbers are noted down. Then the weld specimen is cut into 3 small pieces one for tempering, one for microstructural analysis and one for wear test. The specimens are tempered at different temperature. Then the hardness is noted down. Tempering is made to check whether the specimen hardness increases or decreases or remains the same. The microstructure specimens are prepared by grounding flat, mirror polishing and lastly etching the surface. The surface that is etched are observed under microscope with different magnification. Last experiment conducted is wear test. In this specimens are prepped to conduct wear test. Here the loss of material is analysed. By observing the results obtained on the best flux mixture, will just the flux increase the hardness or is the alloying element is required is analysed. |
