Study The Effect of Filer Material on Microstructure of Welding the Carbon Steel in Shielded Metal Arc Welding

The purpose of this work is to study the mechanical and metaullurigical properteris of carbon steel plates welded by two types of fillers using a shielded metal arc welding (SMAW). The carbon steel plate matreial was of type ASTM A283-C with a thickness of 6mm. The electrodes were of type E7018 and E309-16 with a diameter of 3.2mm. A butt welding configuration was used with a gap of 2mm with a process parameters of welding current = 100A, voltage = 26V. The welded palates were tested by a tensile test, microstructure test, scanning electron microscope (SEM) and X-ray diffraction ( XRD) test. The results refer that the tensile strength of similar filler metal achieved better results than dissimilar filler metal, the microstructure test of welding by E7018 gives the welding zone similar to the base metal, the SEM test showing the microstructure of weld metal when welding by E7018 & E309-16 consist of a mixture of the filler metal and the base metal is about 90% and 20% respectively, The XRD examination showed the base metal of carbon steel having the ratio of the Fe element is high, when welding by E7018 having the ratio of the Fe and Cr are high, and when welding by E309- 16 having the ratio of the Ni was high.