On Electroslag Pressure Welding Of HRB500 Reinforcing Steel Bar

In this paper, the application and development of domestic and foreign Reinforcing Steel Bar, the steel strengthening mechanism, and the major domestic application connection methods are introduced, the steel electroslag pressure welding technology, and the application of the technology on bridges, buildings and other projects in reinforced concrete situation are focused on. And then a few representative HRB500 Reinforcing Steel Bar materials are selected based on test requirements, the basic performance test of reinforced base material is analyzed so as to obtain the welding performance of Reinforcing Steel Bar HRB500 by a series of steel bar electroslag pressure welding test designed based on the test purpose and determine the optimum parameters and the welding process for HRB500 rebar. Moreover, based on the test resulting of tensile test, hardness test and microstructure test for the steel base metal and welded joints, it analyzes the causes and search the approach to solve the irregular joint performance, and finally finishes stage test data analysis to provide a basis for the next test.According to all related reference material and testing, different chemical composition of HRB500 Reinforcing Steel Bar base metal or rolling process lead to different quality of electroslag pressure welding joint, some joints can achieve the quality requirements of the relevant specifications after the trial of the electroslag pressure welding, and others cannot. So further study is carried on to optimize the welding parameters and explore the process and measures to improve welding joints carrying capacity.Enlightened by the impact of Steel Bar flash on welding steel joint features and the comparative analysis of the steel electroslag pressure welding joint, the paper carries on rebar upsetting electroslag pressure welding test. The specific process is to implement pre-upsetting by the rebar upsetting machine at the end to obtain some upsetting head shape, and then adjust the welding parameters for the electroslag pressure welding. The method aims to improve the carrying capacity of the joint by increasing the cross-sectional area of the joint, and the welding parameters is different from conventional ones. On the basis of this method, the qualification of the unsettled unqualified HRB500 Reinforcing Steel Bar can reach 100%, the feasibility and reliability of this process is verified...