Experimental Investigation on the Microstructure and Mechanical Properties of Arc Welded Structural Steel Plate EN10025

Structural alloy steel is widely used in engineering application due to its mechanical properties. The fabrication technique employed to weld carbon steel plays a crucial factor in the performance of the welded parts when put into service. In this study, a process of Arc welding on steel EN10025 which fabricated in Libya; in Musrata steel factory was performed to estimate how the mechanical properties and microstructure affected in different specific places after welding. The Rockwell Hardness testing have been carried out for the welded samples. The microstructural investigation was also carried out for the weld metal (WM), the heataffected zones (HAZ) and the base metal (BM). The test results were analyzed. It is shown that the microstructure results shows large variations in grain size and geometry between the welding zones. The distribution of hardness in all zones was determined. It has been noticed that the hardness value of weld metal rise to around 18% regarding to the base metal value. The main value of the RHc hardness of weld metal was 54 HRc, while the mean value of base metal was 44.5 HRc. Charpy v-notch tests showed a variation in results, however the highest absorbed energy was at weld metal.