This study compared the effect of the interaction time of periodic water clusters on the surface integrity of AISI 304 tungsten inert gas (TIG) welded joints at different excitation frequencies, as the effect of the technological parameters of pulsating water jet (PWJ) on the mechanical properties of TIG welded joints are under-researched. The TIG welded joints were subjected to different frequencies (20 and 40 kHz) and traverse speeds (1-4 mm/s) at a water pressure of 40 MPa and a standoff distance of 70 mm. The effect of the interaction of the pulsating jet on the material and the enhancement in its mechanical properties were compared through residual stress measurements, surface roughness, and sub-surface microhardness. A maximum enhancement in the residual stress values of up to 480 MPa was observed in the heat-affected zone, along with a maximum roughness of 6.03 µm and a maximum hardness of 551 HV using a frequency of 40 kHz. The improvement in the surface characteristics of the welded joints shows the potential of utilizing pulsed water jet technology with an appropriate selection of process parameters in the treatment of welded structures.

Department of Mechanical Engineering Amrita School of Engineering Amrita Vishwa Vidyapeetham Chennai 601103 India

Department of Mechanical Engineering Indian Institute of Technology Dhanbad 826004 India

Department of Mechanical Engineering Vysoká Škola Báňská Technical University 708 00 Ostrava Czech Republic

Faculty of Manufacturing Technologies Technical University of Kosice Prešov Bayerova 1 080 01 Presov Slovakia

Institute of Geonics of the Czech Academy of Sciences Studentska 1768 708 00 Ostrava Poruba Czech Republic

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