Study the effect of the force during the sub resonant vibrations on mechanical properties and microstructure of low carbon steel GMAW weldment

This article studies the impact force during the sub resonant vibrations on mechanical properties and microstructure of carbon steel welded by GMAW process. For testing, sheets of carbon steel welded together in accordance with welding procedure Specification.3 samples under various forces and vibration functions as a control sample (no vibration) is considered. Tests for hardness, tensile, impact and the microstructure of all samples is conducted in accordance with current standards. The results, increasing the yield strength of the samples has shown resonant. The yield strength of 319 MPa and the samples in the sample without a resonant vibration, 381, 363, 421 MPa. Impact resistance test results of the samples showed increased impact resistance is resonant examples. Impact strength of 5.5 joules without vibration and resonant samples 16.5, 18, 10 is Jules. Vickers hardness test results obtained from the samples, reducing the hardness of the resonant shows. Sample without vibration in the heat effected zone 189 Vickers and examples of resonant 141, 152, 120 Vickers is also hardness values in the weld samples without vibration of 244 Vickers and examples of resonant 178, 193, 103 Vickers is . The results of microstructural investigations, did not show significant changes.