Air carbon arc gouging of austenitic stainless steels prior to arc welding – opportunities and risks

Koga, Guilherme Yuuki; Ferreira, Tales; Guerra, Ana Paula de Bribean; Cunha, Danilo Souza da; Wiezel, Jonas Guilherme Gomes; Bolfarini, Claudemiro

doi:10.1016/j.jmatprotec.2022.117524

Cited by 4 publications

(4 citation statements)

References 17 publications

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“…SING ELECTRIC ARC, large current power converters are used for controlled conversion of electric energy to high-intensity heat source to melt both the consumable electrode and the base metal [1]- [7]. Depending upon the mode of feeding consumables to the heat source, the process could be categorized as minimally semi-automatic where the electrode feeding is motorized or manual.…”

Section: Introductionmentioning

confidence: 99%

“…Using different electrodes and shielding arrangement around the molten pool, they could be used to make joints using sub-merged arc welding (SAW) method [2], manual arc welding methods, etc. [7], or could be used to deposit a surface layer to boost the wear resistance of base metal (hard-facing) [3], [4] or to deposit a thin coating layer to provide the requisite corrosion resistance to base metal (weld overlay) by electro-strip cladding [6]. Similar rated power converters are used for welding, gouging [7] or arc cutting applications where the electrode feeding is manual.…”

Section: Introductionmentioning

confidence: 99%

“…[7], or could be used to deposit a surface layer to boost the wear resistance of base metal (hard-facing) [3], [4] or to deposit a thin coating layer to provide the requisite corrosion resistance to base metal (weld overlay) by electro-strip cladding [6]. Similar rated power converters are used for welding, gouging [7] or arc cutting applications where the electrode feeding is manual. The constant voltage (CV) at load is preferred for semi-automatic processes [8], and constant current (CC) arc type is preferred when the electrode feeding is manual [9].…”

Section: Introductionmentioning

confidence: 99%

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De-Coupled Control of Energy-Efficient High-Power CC/CV Power Source for Arc Welding

Paul

2024

Preprint

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In industry, for superior utilization of large capital equipment, a single large-current high-power converter is desired to convert electrical energy to a controlled high-intensity heat source to cater to the dynamic requirement of several welding methods (e.g., welding, hard-facing, gouging, weld overlay, etc.). The dynamic process behavior of multi-input minimally semiautomatic or single-input manual processes could follow either constant voltage (CV) or constant current (CC) arc type. Due to completely different type of arc or load characteristics, this article proposes a de-coupled control approach to guide the power source to independently take care of each arc type. It proposes feedforward control for CV arc type and robust second order sliding mode control (SOSMC) approach for dynamically uncertain CC arc type for manual welding. It further highlights that low-loss resonant or soft-switching topologies are less compatible for decoupled control of high-power loads with wide range impedance characteristics. For desired energy efficiency of a full-bridge DC-DC converter for arc welding, this article details that robustness features of SOSMC could be used for superior component engineering that incur low power loss. Finally, this article completely validates the proposed idea in a 1000A power converter for both CC and CV arc types.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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De-Coupled Control of Energy-Efficient High-Power CC/CV Power Source for Arc Welding

Paul

2024

Preprint

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“…1,2 Back-gouging is an important process in full penetration welding to ensure weld penetration. 3 However, a large number of pollutants, such as smoke and dust, are generated during the weld back-cleaning process. Casting cleaning workshops, therefore, produce many kinds of pollutants in different ways and in large quantities.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on particle removal and energy consumption of supplied and recirculated ventilation for industrial workshop

Lan

Diao

2023

Indoor and Built Environment

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In the weld back-cleaning process, many high-concentration pollutants are produced, which can lead to health problems after prolonged exposure. In this study, a novel recirculating stratified ventilation system is proposed that combines supply and recirculating ventilation. It reduces indoor particulate concentration and exhausts air volume based on the air gouging process in a casting workshop. The influences of the supplied and recirculated air velocities on the particle removal efficiency and energy consumption were investigated and compared with those of a traditional exhaust system. The computational fluid dynamics-discrete phase model coupling method was adopted. First, the feasibility of the model was verified using previously published experimental data. The concentration of the unsteady particles was then simulated with different supplied and recirculated air velocities in the ventilation system. The particles were dispersed owing to the influence of the heat-source temperature. With an increasing supplied air velocity and constant recirculated air velocity, the average particle concentration was decreased. The results show that the particle removal efficiency can be improved by approximately 100%, and 90% of the energy can be saved to achieve the same removal efficiency as a traditional ceiling exhaust system.

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Non-Destructive Evaluation of the AISI 304 Stainless Steel Susceptibility to Intergranular Corrosion by Electrical Conductivity Measurements

Radojković,

Jegdić,

Marunkić

et al. 2023

Met. Mater. Int.

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Air carbon arc gouging of austenitic stainless steels prior to arc welding – opportunities and risks

Cited by 4 publications

References 17 publications

De-Coupled Control of Energy-Efficient High-Power CC/CV Power Source for Arc Welding

De-Coupled Control of Energy-Efficient High-Power CC/CV Power Source for Arc Welding

Numerical investigation on particle removal and energy consumption of supplied and recirculated ventilation for industrial workshop

Non-Destructive Evaluation of the AISI 304 Stainless Steel Susceptibility to Intergranular Corrosion by Electrical Conductivity Measurements

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