Influência da taxa de subida da corrente na regularidade do processo MIG/MAG por curto-circuito
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2023-02-28
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Universidade Federal de Goiás
Resumo
The present work investigates the effects of the current rise rate (power
source inductance adjustment) on the regularity of the MIG/MAG welding
process operating in short-circuit mode. For this, initially the adjustment of
the inductive effect of the power source was varied, keeping the regulation
voltage and the supply speed constant. Using a regularity index calculated
from the current voltage signals, the best fit of the inductive effect was
determined. Then, the value of the inductive effect (average rate of current
rise) was fixed and the welding voltage was varied with the feed speed kept
constant. All tests were performed with 3 shielding gases with different
percentages of CO2 (100% Ar, Ar+25%CO2, 100% CO2). As a result of the
data analysis, it was possible to find the range of values for the rate of rise of
welding current and voltage where the process operates with greater
regularity. Preliminary results show that shielding gas influences the
correlation between welding voltage, current rise rate and process regularity.
After finding the range of values where the process is more regular,
experiments were carried out to try to relate regularity with the generation of
spatter, the generation of spatter had a tendency contrary to that of
regularity, the best performance was with 100% CO2, followed by 100% Ar
and the worst mass yield were Ar + 25% CO2.
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NIZ, W. R. Influência da taxa de subida da corrente na regularidade do processo MIG/MAG por curto-circuito. 2022. 73 f. Dissertação (Mestrado em Engenharia Mecânica) - Universidade Federal de Goiás, Goiânia, 2023.