Intrinsic errors on cryogenic calorimetry applied to arc welding

Liskévych, Olga; Quintino, L.; Vilarinho, Louriel Oliveira; Scotti, Américo

doi:10.1007/s40194-013-0035-5

Cited by 15 publications

(16 citation statements)

References 4 publications

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“…In a previous publication of Liskevych et al (2013), it was shown that there are significant differences between the heat input measured experimentally by calorimetric methods and the actual heat input that is delivered to the work pieces under welding. The first method represents only the remaining energy in the test plate by the time of measurement.…”

Section: Methodological Backgroundmentioning

confidence: 99%

“…They claimed that the random error becomes insignificant by using this device. Further in this direction, Liskevych et al (2013) showed that some intrinsic errors still persist in measurements when this automated cryogenic calorimeter is applied. However, they showed evidences that these errors could be determined and eliminated in the heat input determination.…”

Section: Introductionmentioning

confidence: 96%

“…In summary, during welding, part of the delivered heat to the plate dissipates to the environment by radiation from the still hot bead surfaces (on the weld side and/or root surface, in the case of full penetration) and by convection from the heated bead and adjacent and opposite surfaces. Further details of this modeling can also be seen in Liskevych et al (2013).…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the objective of this work is beyond the confirmation of intrinsic errors in cryogenic calorimetry, as already evidenced by Liskevych et al (2013), i.e., is to discriminate the sources of these errors and, mainly, to propose and assess a methodological approach to expurgate them from results, leading to the determination of gross heat inputs. Consequently, a greater number of tests, with different objectives, and application of statistical analysis and extrapolation techniques are demanded, different from Liskevych et al previous work, to reach the proposed objective.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the gross heat input in arc welding

Liskévych

Scotti

2015

Journal of Materials Processing Technology

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a b s t r a c tA method to expurgate intrinsic errors from cryogenic calorimetric measurements is described. The sources of errors were identified and experimental procedures were devised to expurgate quantitatively the deviations from the true values, using extrapolation and linearization techniques. The methodology was applied to a case of MIG/MAG welding of carbon steel. The outcome of this approach represents the actual heat input (referred to here as gross heat input) and evidences that the commonly accepted conventional heat input measured by calorimetric methods represents only part of the heat input that is absorbed by the samples. It is expected that the gross heat input values can be successfully used in numerical simulations for better reliability in prediction models on welding.

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Section: Methodological Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination of the gross heat input in arc welding

Liskévych

Scotti

2015

Journal of Materials Processing Technology

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“…Even though being aware of the limitations of calorimetric methods for heat input measurement, as stated by Hurtig et al [11] and Liskevych et al [12], a fully automated cryogenic calorimeter, as described by Liskevych and Scotti [13], was used. Different from that recommended in the latter citation, all comparisons were carried out following just one test condition to economize resources, i.e.…”

Section: Stage 2: Constant × Pulsed Current In Gtaw Supported By Calomentioning

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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