This study was conducted over the welding parameters associated with three levels of pulse to lead to important data for the deposition of metal on martensitic stainless steel, through tubular electrode EC410NiMo MC – ESAB by the conventional and pulsed flux core arc welding (FCAW) process in SAE 1020 steel. Were applied three current levels, 170A, 200A e 230A with welding speed of 300 mm/s, 350 mm/s and 400 mm/s, respectively and distance torch tip-piece of 30, 33 and 36 mm to obtain the necessary cords for evaluation. The results showed that the main effect of welding parameters are: the increase in the welding speed and the amperage of the arc tend to increase the fusion rate when we pass from level +1 to -1, for the conventional current and reduced for the pulsed current when evaluating the level -A to +A. However, the efficiency decreases with the increase of welding speed for both processes: conventional and pulsed current, but increases with increasing amperage of the arc when evaluating the level -1 to +1 for conventional and - A to +A only for pulsed process. Also, we observe that the efficiency in both cases with conventional and pulsed current decreases as we increase the distance nozzle/piece. The spectra emitted by the accelerometer showed greater stability of the voltage and current process, but an important instability in the acceleration applied to the three current levels.

 

Key words: Fusion rate, accelerometer, tubular electrode, welding speed, pulsed flux core arc welding (FCAW).