Abstract
Manual arc welding is widely used in all kinds of welding material in the civil engineering because of their stable performance characteristics. Based on the analysis of the incision morphology, microstructure and hardness distribution of different kinds of welding joints by manual arc welding methods, how the different welding method of hot rolling ribbed rebar influenced on the performance of the organization has been emphatically discussed to further optimize its performance and provides theoretical basis for the process. The experimental results show that due to the different welding methods and the different heat input, the macro morphology of each welding joints are not identical. The microstructure of welding joints are mainly formed by proeutectoid ferrite, low carbon martensite, tempered sorbite, fine grain ferrite and pearlite. Different welding method, the vickers hardness values along the axis direction of the welded joint and along the direction of cross section are also not identical, and all these lead to the different performance of the different welding joints.
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