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Alexander Kaplan - One of the best experts on this subject based on the ideXlab platform.
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On the influence of metal Cored Wire composition on the laser hybrid welding process
International Congress on Applications of Lasers & Electro-Optics, 2020Co-Authors: Pål Dyberg, Alexander Kaplan, J. ZachrissonAbstract:Metal Cored Wires are often used in gas metal arc welding to increase productivity. Cored Wires can, however, also easily be designed to affect weld metal composition or arc characteristics. Specially formulated metal Cored Wires, designed for laser hybrid welding, could therefore potentially be used to improve the arc and weld pool characteristics and enhance the process flexibility, robustness and productivity. The range of process parameters available in hybrid welding could thereby be extended and the process stability improved further for standard parameters.Small additions of certain elements in the Wire can influence the arc plasma state and the surface tension, resulting in an altered arc and weld pool behaviour. A number of metal Cored Wires have therefore been produced containing additions of several different arc stabilising elements, varied from 0-10% of the powder filling.High speed filming of the welding process with synchronised arc current and voltage measurements was conducted enabling e.g. to detect short short-circuiting. Preliminary results indicate differences in process stability, arc length, surface appearance and penetration profiles between the Wires in pulsed mode transfer. The experimental results are accompanied by a theoretical discussion of the phenomena observed, including the use of the Saha equation to calculate electron number density as a function of temperature for relevant chemical elements.Metal Cored Wires are often used in gas metal arc welding to increase productivity. Cored Wires can, however, also easily be designed to affect weld metal composition or arc characteristics. Specially formulated metal Cored Wires, designed for laser hybrid welding, could therefore potentially be used to improve the arc and weld pool characteristics and enhance the process flexibility, robustness and productivity. The range of process parameters available in hybrid welding could thereby be extended and the process stability improved further for standard parameters.Small additions of certain elements in the Wire can influence the arc plasma state and the surface tension, resulting in an altered arc and weld pool behaviour. A number of metal Cored Wires have therefore been produced containing additions of several different arc stabilising elements, varied from 0-10% of the powder filling.High speed filming of the welding process with synchronised arc current and voltage measurements was conducted enabling e....
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On the influence of metal Cored Wire deposition on the hybrid welding process
2020Co-Authors: Pål Dyberg, Alexander Kaplan, J. ZachrissonAbstract:Metal Cored Wires are often used in gas metal arc welding to increase productivity. Cored Wires can, however, also easily be designed to affect weld metal composition or arc characteristics. Specia ...
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process stability during fiber laser arc hybrid welding of thick steel plates
Optics and Lasers in Engineering, 2018Co-Authors: Ivan Bunaziv, Jan Frostevarg, Odd M Akselsen, Alexander KaplanAbstract:Abstract Thick steel plates are frequently used in shipbuilding, pipelines and other related heavy industries, and are usually joined by arc welding. Deep penetration laser-arc hybrid welding could increase productivity but has not been thoroughly investigated, and is therefore usually limited to applications with medium thickness (5-15 mm) sections. A major concern is process stability, especially when using modern welding consumables such as metal-Cored Wire and advanced welding equipment. High speed imaging allows direct observation of the process so that process behavior and phenomena can be studied. In this paper, 45 mm thick high strength steel was welded (butt joint double-sided) using the fiber laser-MAG hybrid process utilizing a metal-Cored Wire without pre-heating. Process stability was monitored under a wide range of welding parameters. It was found that the technique can be used successfully to weld thick sections with appropriate quality when the parameters are optimized. When comparing conventional pulsed and the more advanced cold metal transfer pulse (CMT+P) arc modes, it was found that both can provide high quality welds. CMT+P arc mode can provide more stable droplet transfer over a limited range of travel speeds. At higher travel speeds, an unstable metal transfer mechanism was observed. Comparing leading arc and trailing arc arrangements, the leading arc configuration can provide higher quality welds and more stable processing at longer inter-distances between the heat sources.
Odd M Akselsen - One of the best experts on this subject based on the ideXlab platform.
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process stability during fiber laser arc hybrid welding of thick steel plates
Optics and Lasers in Engineering, 2018Co-Authors: Ivan Bunaziv, Jan Frostevarg, Odd M Akselsen, Alexander KaplanAbstract:Abstract Thick steel plates are frequently used in shipbuilding, pipelines and other related heavy industries, and are usually joined by arc welding. Deep penetration laser-arc hybrid welding could increase productivity but has not been thoroughly investigated, and is therefore usually limited to applications with medium thickness (5-15 mm) sections. A major concern is process stability, especially when using modern welding consumables such as metal-Cored Wire and advanced welding equipment. High speed imaging allows direct observation of the process so that process behavior and phenomena can be studied. In this paper, 45 mm thick high strength steel was welded (butt joint double-sided) using the fiber laser-MAG hybrid process utilizing a metal-Cored Wire without pre-heating. Process stability was monitored under a wide range of welding parameters. It was found that the technique can be used successfully to weld thick sections with appropriate quality when the parameters are optimized. When comparing conventional pulsed and the more advanced cold metal transfer pulse (CMT+P) arc modes, it was found that both can provide high quality welds. CMT+P arc mode can provide more stable droplet transfer over a limited range of travel speeds. At higher travel speeds, an unstable metal transfer mechanism was observed. Comparing leading arc and trailing arc arrangements, the leading arc configuration can provide higher quality welds and more stable processing at longer inter-distances between the heat sources.
Ivan Bunaziv - One of the best experts on this subject based on the ideXlab platform.
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process stability during fiber laser arc hybrid welding of thick steel plates
Optics and Lasers in Engineering, 2018Co-Authors: Ivan Bunaziv, Jan Frostevarg, Odd M Akselsen, Alexander KaplanAbstract:Abstract Thick steel plates are frequently used in shipbuilding, pipelines and other related heavy industries, and are usually joined by arc welding. Deep penetration laser-arc hybrid welding could increase productivity but has not been thoroughly investigated, and is therefore usually limited to applications with medium thickness (5-15 mm) sections. A major concern is process stability, especially when using modern welding consumables such as metal-Cored Wire and advanced welding equipment. High speed imaging allows direct observation of the process so that process behavior and phenomena can be studied. In this paper, 45 mm thick high strength steel was welded (butt joint double-sided) using the fiber laser-MAG hybrid process utilizing a metal-Cored Wire without pre-heating. Process stability was monitored under a wide range of welding parameters. It was found that the technique can be used successfully to weld thick sections with appropriate quality when the parameters are optimized. When comparing conventional pulsed and the more advanced cold metal transfer pulse (CMT+P) arc modes, it was found that both can provide high quality welds. CMT+P arc mode can provide more stable droplet transfer over a limited range of travel speeds. At higher travel speeds, an unstable metal transfer mechanism was observed. Comparing leading arc and trailing arc arrangements, the leading arc configuration can provide higher quality welds and more stable processing at longer inter-distances between the heat sources.
Algirdas Vaclovas Valiulis - One of the best experts on this subject based on the ideXlab platform.
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analysis of Wire arc spraying process variables on coatings properties
Journal of Materials Processing Technology, 2006Co-Authors: Irmantas Gedzevicius, Algirdas Vaclovas ValiulisAbstract:Abstract The objective of the present study is thus to investigate the effect of particles velocity, temperature on the Cored Wire coatings properties. The results of a systematic investigation of the influence of different nozzles configurations on the coatings properties are presented, including the gas dynamics properties of the spray jet were calculated by using the CFD code, temperature, velocity and diameter of the particles in-flight measurements and the effects on the particles properties on coating adhesion, pores and oxide content. The microstructures of arc spray coatings using a newly developed thermal spray nozzle, was studied and compared with those of regular arc sprayed coatings. The test results showed that coatings had better properties than those of regular arc sprayed coatings.
Jicai Feng - One of the best experts on this subject based on the ideXlab platform.
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metal transfer in underwater flux Cored Wire wet welding at shallow water depth
Materials Letters, 2015Co-Authors: Meirong Wang, Yongpeng Du, Jicai FengAbstract:Abstract The metal transfer process of underwater flux-Cored Wire wet welding is successfully observed by an X-ray transmission method. The relatively large retention forces acting on the droplet induced by the electromagnetic force, vaporization force, surface tension resultant force and gas flow drag force make the transfer mode as a combination of globular repelled transfer mode and short circuit transfer mode with the average transfer frequency of 4.3 Hz with arc voltage of 24 V and welding current of 240 A.