Stability Study of a Coating Welding Using Pulsed FCAW Process Through the Evaluation of Current and Voltage Oscillograms

Objective: The objective of this study is to analyze the electric arc signals in pulsed cored wire surfacing welding with SAE 1020 base metal and AWS EC410NiMo MC filler metal. Theoretical Framework: Fluxed Cored Arc Welding (FCAW) is a process where fusion is produced by an electric arc established between the workpiece and the consumable wire with the protection of the molten pool by a gas. Method: The tests were performed with some fixed test parameters such as: flat position, electrode polarity (CCEP), welding torch position (90º), shielding gas (Ar + 2% O2) with a flow rate of 15 L/min.; peak current of 350A. Results and Discussion: Current and voltage oscillograms were analyzed to verify the stability of the process, with the regularity of metal transfer through voltage pulses at peak current moments, the maintenance of variables through mean and standard deviation values, and the analysis of the Vilarinho Regularity Index. Research Implications: Through the signals obtained by the accelerometer, it was possible to conclude that for the 230A current, the system presented a smaller oscillation, with values between 0.132 and 0.197 m/s2, which was fundamental for the industrial viability of the process. Originality/Value: By acquiring the voltage, current, and acoustic pressure signals of the electric arc, the stability of the process generated important operational aspects for this welding process.