Selected properties of RAMOR 500 steel welded joints by hybrid PTA-MAG

Skowrońska, Beata; Szulc, J.; Bober, M.; Baranowski, Michał; Chmielewski, Tomasz

doi:10.1016/j.jajp.2022.100111

Cited by 19 publications

(5 citation statements)

References 18 publications

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“…Digital transformation has been defined in a number of different ways but, in general, it refers to process improvement using digital technologies [15][16][17][18][19][20]. Digital transformation in the construction industry aims to innovate and improve productivity by employing digital technologies during the construction process [21].…”

Section: Digital Transformationmentioning

confidence: 99%

Key Initiatives for Digital Transformation, Green New Deal and Recovery after COVID-19 within the Construction Industry in Korea

Kim

Lee

et al. 2022

Sustainability

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The low productivity of the construction industry has been identified as a chronic problem, and this has been exacerbated by recent environmental factors, including COVID-19 and climate change. As a response to these environmental changes, policies related to recovery after COVID-19, digital transformation, and the Green New Deal have been established worldwide, and related projects have been launched. These three issues may seem to have different goals but they are interrelated, and guidelines for the direction of the construction industry should be outlined. In this study, key initiatives that need to be prioritized to successfully achieve the goals of the three issues are identified. Based on these, strategic directions and mid- to long-term measures to address environmental changes are suggested. This study surveys the perceptions of construction experts to establish the key initiatives via the analytic hierarchy process method, and their expected utility was evaluated. This study is significant in that it analyzes how construction experts perceive environmental changes and contributes to the development of the construction industry by identifying key initiatives that should be undertaken.

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Section: Digital Transformationmentioning

confidence: 99%

Key Initiatives for Digital Transformation, Green New Deal and Recovery after COVID-19 within the Construction Industry in Korea

Kim

Lee

et al. 2022

Sustainability

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“…During welding, an open keyhole can be produced with a lower welding current and higher welding speed compared to the conventional KPAW. Plasma–GMA (or Metal Inert Gas (MIG) using inert shielding gas for GMA) hybrid welding is especially suitable for welding of thick plates [ 23 , 24 ]. PAW in the leading position produces a keyhole and then GMAW in the trailing position fills the keyhole with metal droplets transferred from the wire, achieving high-efficiency welding with low heat input.…”

Section: Introductionmentioning

confidence: 99%

Interaction Mechanism of Arc, Keyhole, and Weld Pool in Keyhole Plasma Arc Welding: A Review

Tashiro

2024

Materials

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The Keyhole Plasma Arc Welding (KPAW) process utilizes arc plasma highly constricted by a water-cooled cupper nozzle to produce great arc pressure for opening a keyhole in the weld pool, achieving full penetration to the thick plate. However, advanced control of welding is known to still be difficult due to the complexity of the process mechanism, in which thermal and dynamic interactions among the arc, keyhole, and weld pool are critically important. In KPAW, two large eddies are generally formed in the weld pool behind the keyhole by plasma shear force as the dominant driving force. These govern the heat transport process in the weld pool and have a strong influence on the weld pool formation process. The weld pool flow velocity is much faster than those of other welding processes such as Tungsten Inert Gas (TIG) welding and Gas Metal Arc (GMA) welding, enhancing the heat transport to lower the weld pool surface temperature. Since the strength and direction of this shear force strongly depend on the keyhole shape, it is possible to control the weld pool formation process by changing the keyhole shape by adjusting the torch design and operating parameters. If the lower eddy is relatively stronger, the heat transport to the bottom side increases and the penetration increases. However, burn-through is more likely to occur, and heat transport to the top side decreases, causing undercut. In order to realize further sophistication of KPAW, a deep theoretical understanding of the process mechanism is essential. In this article, the recent progress in studies regarding the interaction mechanism of arc, keyhole, and weld pool in KPAW is reviewed.

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“…Hybrid welding includes hybrid laser-arc welding, hybrid plasma-MIG/MAG welding, and other technologies [1,2]. Hybrid laser-arc welding is widely used in the field of marine engineering.…”

Section: Introductionmentioning

confidence: 99%

Arc Characteristics and Welding Process of Laser K-TIG Hybrid Welding

Zhang

et al. 2022

Metals

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The Q235 steel plate butt joint was successfully welded by the laser K-TIG hybrid welding method. The effects of hybrid welding process parameters such as welding current, the distance between heat sources, laser power, laser defocusing amount, and welding speed on the coupled arc profile and welding process stability were studied. The results indicated that the laser deflects the K-TIG arc, and the deflection angle becomes smaller as the arc current increases. After K-TIG generates small holes, if the laser beam acts on the bottom of the keyhole, the welded depth can be further increased; however, the laser power has little effect on the welded depth. The distance between heat sources is the main factor affecting the state of laser-arc coupling. Optical microstructures of welded joints showed that the grains in the arc zone were coarser than those in the laser zone, and there are more columnar crystals in the fusion zone. The microhardness of the weld center is significantly higher than that of the base metal, up to 220 HV. At the same time, the change of tensile strength of the weld under the influence of a single parameter was analyzed, and it was found that tensile properties of the weld first increased and then decreased with the increase of K-TIG arc current I, heat source distance D, and welding speed V, respectively. With the increase of laser power P, it first decreased and then increased, and with the increase of laser defocusing amount δf, it showed a downward trend.

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Selected properties of RAMOR 500 steel welded joints by hybrid PTA-MAG

Cited by 19 publications

References 18 publications

Key Initiatives for Digital Transformation, Green New Deal and Recovery after COVID-19 within the Construction Industry in Korea

Key Initiatives for Digital Transformation, Green New Deal and Recovery after COVID-19 within the Construction Industry in Korea

Interaction Mechanism of Arc, Keyhole, and Weld Pool in Keyhole Plasma Arc Welding: A Review

Arc Characteristics and Welding Process of Laser K-TIG Hybrid Welding

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