Microstructure and performance of low matched welded joint by vibratory welding technology

In order to investigate the effect on the metallurgical structure and mechanical property of low matched hightensile steel welded joint by vibratory welding technology,KPS-70 high-tensile steel welding wire was used as welding material in the experiment. It was welded by(80% Ar +20% CO₂) gas shielded arc welding and was being vibrated mechanically in low frequency. The metallurgical structures and mechanical properties of welded joint with different vibratory parameters were analyzed using optical microscope,X-ray inflection, welded joint tensile test and deposited metal tensile test. The results show that the vibratory welding technology is able to improve strength and plasticity of weld metal. The size of grain of weld is refined. As the amplitude is too large,it will affect welding process parameters, which results in weld defects and deterioration of mechanical properties.