Heat Exchange and Voltage Drop in Welding Arc Column

Rossi, Marcelo Lemos; Ponomarev, V. D.; Scotti, Américo

doi:10.1109/tps.2016.2606628

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…7 Relationship between bead cross-section (fused area) and heataffected zone (HAZ) areas (average of three cross-sections) and Wong and Ling's gross (P R ) and active (P Zr ) powers On the other hand, the authors of this work recognize that to model the arc as an equivalent electrical circuit does not seem to be an easy task. Rossi et al [16], for instance, claim that the arc column should not be treated as a pure ohmic electrical resistance and the voltage drop in the plasma column would be a function mainly of the energy needed for a recurrent and constant reionization of the arc column atoms. However, they also warn that nothing is wrong with an electrical resistance analogy for the arc column, especially when applied in mathematical modelling of the arc and its effects.…”

Section: Stage 3: Variation Of Active Power Through Inductance Settinmentioning

confidence: 99%

Active power measurement in arc welding and its role in heat transfer to the plate

Jorge

Gohrs²,

Scotti

2017

Weld World

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A contemporary paper claimed that a method using the resistance of impedance (active power) for arc power calculation is more accurate than the conventional approach, with consequences on the actual heat transfer to the plate. However, despite the comprehensive reasoning, no heat-related results are shown in this intriguing paper to support the claim. Thus, the aim of this work was to apply the proposed method for determining the weight of active power in the total arc power. A series of weldments was carried out, by using GTAW in constant and pulsed current modes and short-circuiting GMAW with different inductance settings. The effect of the active power on the heat transfers to the plate was assessed by both bead crosssection geometries and calorimetry. The results showed that even a significant fraction of active power of the total power was reached, no changes in bead geometry or heat input were found. A review of the assumptions used in the primal paper showed that an arc is better represented by an ER circuit than by an RLC circuit. As a conclusion, the arc as a reactance-free load presents no component such as nonactive power and the conventional approaches are accurate methods to measure arc power, representing the actual active power.

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Section: Stage 3: Variation Of Active Power Through Inductance Settinmentioning

confidence: 99%

Active power measurement in arc welding and its role in heat transfer to the plate

Jorge

Gohrs²,

Scotti

2017

Weld World

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“…The LLC resonant converter has been applied quite sophisticatedly in these fields. However, in high-power power supplies, for example, the welding power supply, the ratio of voltage and current, namely, the equivalent resistance of the arc, actually show a drastic variation (Rossi et al , 2016). Therefore, in the welding field, the application of LLC resonant converter is hindered by these restrictions.…”

Section: Introductionmentioning

confidence: 99%

Novel and simplified implementation of digital high-power pulsed MIG welding power supply with LLC resonant converter

Huang²,

Chen³

et al. 2022

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Purpose This paper aims to overcome the limitations of low efficiency, low power density and strong electromagnetic interference (EMI) of the existing pulsed melt inert gas (MIG) welding power supply. So a novel and simplified implementation of digital high-power pulsed MIG welding power supply with LLC resonant converter is proposed in this work. Design/methodology/approach A simple parallel full-bridge LLC resonant converter structure is used to design the digital power supply with high welding current, low arc voltage, high open-circuit voltage and a wide range of arc loads, by effectively exploiting the variable load and high-power applications of LLC resonant converter. Findings The efficiency of each converter can reach up to 92.3%, under the rated operating condition. Notably, with proposed scheme, a short-circuit current mutation of 300 A can stabilize at 60 A within 8 ms. Furthermore, the pulsed MIG welding test shows that a stable welding process with 280 A peak current can be realized and a well-formed weld bead can be obtained, thereby verifying the feasibility of LLC resonant converter for pulsed MIG welding power supply. Originality/value The high efficiency, high power density and weak EMI of LLC resonant converter are conducive to the further optimization of pulsed MIG welding power supply. Consequently, a high performance welding power supply is implemented by taking adequate advantages of LLC resonant converter, which can provide equipment support for exploring better pulsed MIG welding processes.

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“…The existing arc MHD models are mostly DC arc, with few AC arc MHD models. The arc is considered pure resistance, so its heat generation power equals the electrical power 26 . In the 'zero current' stage, the electric power of the arc is 0, so no heat is generated.…”

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confidence: 99%

Numerical investigations of AC arcs’ thermal characteristics in the short gap of copper-cored wires

Li,

Zhang,

Yang

et al. 2024

Sci Rep

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Excessive alternating current (AC) arcs generated in electric systems will accumulate heat and easily cause fire. This paper studies the thermal characteristics of different numbers of AC arc plasma generated in a short gap of copper-cored wires in the air. The number of AC arcs is controlled in the AC arc experiment and an infrared thermal imager measures the temperature change at the specified position. Based on magnetohydrodynamics (MHD), a two-dimensional axisymmetric AC arc discharge numerical simulation model is established. The volt-ampere characteristic of the AC arc is used to solve the MHD simulation model to obtain the same 'zero current' characteristics as the real AC arc in the experiment. A large amount of heat accumulates in the electrode gaps when the arc generation, and then the heat dissipates in the 'zero current' stage. The continuously generated arc makes the temperature higher. The volume of the space area with a temperature higher than 10,000 K increases with the arc current, but is unrelated to the number of arcs. The volume of the space area with a temperature higher than 524.15 K and the temperature on the electrode are both positively correlated with the number of AC arcs and arc current. The results of this study can provide a reference for the detection standard of AC arc faults and the prevention of electrical fire.

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Heat Exchange and Voltage Drop in Welding Arc Column

Cited by 6 publications

References 17 publications

Active power measurement in arc welding and its role in heat transfer to the plate

Active power measurement in arc welding and its role in heat transfer to the plate

Novel and simplified implementation of digital high-power pulsed MIG welding power supply with LLC resonant converter

Numerical investigations of AC arcs’ thermal characteristics in the short gap of copper-cored wires

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