Microstructural characteristics and tensile properties of ER70S-6 manufactured by Robotic CMT wire-and-arc additive manufacturing

To determine the optimal welding practises, a study was conducted for this paper. This paper concludes the study to find the best welding conditions for producing thin walls with a smooth surface by selecting the desired parameters for the process of wire Arc additive manufacturing(WAAM). A new method for producing metal parts additively is the WAAM technology and when compared to laser or electron beam technologies, has a cheaper startup and operating expenses.. In accordance with AWS standards, the process parameters are specially chosen while considering the development of the final samples' microstructure and mechanical characteristics after serially depositing weld beads made of ER70S-6 steel. In this work, we have combined a welding robot, a cold metal transfer (CMT) power source, and WAAM technology. To better understand the temperature variance experienced by the samples, which may have an impact on the completed product's mechanical properties, the heat input and feed rate during the weld bead deposition have been changed. The final cooling took place in calm, room-temperature air, and a 20-second delay seen between the placement of one weld bead and the next.The tests on mechanical properties that were conducted included bend tests, Vickers microhardness tests, chemical tests, observations made at both the macro and micro levels, and mechanical properties. The test results have been analysed, and the results indicate that altering the process parameters has little effect on the variations between the samples.