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![Shielded metal arc welding scheme[8]](profile/Yordan-Denev/publication/364836306/figure/fig1/AS:11431281092938595@1667047001647/Shielded-metal-arc-welding-scheme8.jpg)
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![Fig.1. Shielded metal arc welding scheme[8]](profile/Yordan-Denev/publication/364836306/figure/fig1/AS:11431281092938595@1667047001647/Shielded-metal-arc-welding-scheme8_Q320.jpg)
Shielded metal arc welding is widely used in heavy industries in partly shipbuilding and ship repair. This method didn't required special personal skills and equipment. Different scientists are analyzed welding parameters, mechanical characteristics and chemical composition in welding seam but interesting is to be investigated welding arc character...
Citations
... Base metal, electrodes, welding process, and parameters have a notable effect on the quality of weldments and their effectiveness in service [9,10]. In SMAW, both alternating and direct current energy sources can be used [11]. DC provides high penetration and low melting rates with straight polarity. ...
This research investigates the impact of root pass removal procedures, specifically back grinding and back gouging, on the mechanical and microstructural properties of mild steel joints welded through shielded metal arc welding (SMAW). The study employs ASTM A516 grade 70 base metal and E7018 electrode, providing detailed information on welding parameters, joint preparation, and testing methods. Microstructural analysis indicates that the back-gouged joint, with higher heat input, exhibits coarser grains in heat-affected and fusion zones compared to the back-ground joint. Tensile tests reveal superior mechanical properties in the back-ground joint, attributed to grain refinement. Charpy impact tests highlight a 9.5% reduction in impact toughness for the back-gouged joint associated with coarser grains. Microhardness profiles support these findings, emphasizing the importance of welding parameters in achieving desired microstructural outcomes and mechanical performance. The research contributes valuable insights for optimizing welding processes and improving the integrity of welded joints.
