Abstract
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).
Highlights
Fluxed cored arc welding (FCAW) is one of the current processes that have fundamental differences with the metal inert gas (MIG) process, for example, it offers more flexibility in the composition of the alloy, while allowing higher deposition rates of wire and a greater arc stability, the efficiency of the MIG process is normally higher as reported Shoeb et al (2013)
The protection of the deposited metal and the weld pool are given by the decomposition of the internal flow of consumable wire, and can be further aided by a shielding gas, usually CO2
In this study, the influence of important variables such as welding speed, the average amperage arc distance and the tip of the torch-piece was studied in order to determine the efficiency of the processes for both conventional current as for pulsed current controlling the rate of fusion as reported by Kumar et al (2012)
Summary
Fluxed cored arc welding (FCAW) is one of the current processes that have fundamental differences with the metal inert gas (MIG) process, for example, it offers more flexibility in the composition of the alloy, while allowing higher deposition rates of wire and a greater arc stability, the efficiency of the MIG process is normally higher as reported Shoeb et al (2013). Recent studies show that pulsed current can weld in all positions and to obtain higher deposition rate when compared to conventional current second (Mohamat et al, 2012) Another important factor is the use of an average low current welding current used compared to the same conditions with a conventional source, providing less distortion in the pieces. In this study, the influence of important variables such as welding speed, the average amperage arc distance and the tip of the torch-piece was studied in order to determine the efficiency of the processes for both conventional current as for pulsed current controlling the rate of fusion as reported by Kumar et al (2012)
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