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Shielding gas

About: Shielding gas is a research topic. Over the lifetime, 6697 publications have been published within this topic receiving 58668 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, the results of welding magnesium alloys AZ91HP and AM50HP with a 3 kW Nd:YAG laser and a 6 kW CO2 laser with an industrial robot and a gantry robot system are shown from a production point of view.
Abstract: The importance of light weight magnesium alloys, especially for the automotive industry, has grown significantly during the last years. To fully benefit from the whole designing potential of this material, joining processes have to be developed. Laser beam welding turns out to be very suitable to join magnesium parts. The results of welding magnesium alloys AZ91HP and AM50HP with a 3 kW Nd:YAG laser and a 6 kW CO2 laser with an industrial robot and a gantry robot system are shown from a production point of view. The determination of the process window by analyzing the influence of laser type, power, welding velocity, and shielding gas, as well as the influence of the base material, leads to conclusions about process stability and production tolerances. Further investigations concerning fixturing techniques as well as seam preparation and joint geometry show effects on the process flexibility and the effort to realize high quality seams under production conditions. The investigated process parameters are e...

32 citations

Patent
31 Aug 2001
TL;DR: In this article, an arc welding system and methodology to facilitate an improved fillet weld is presented, which includes optimized welding parameters, welding wire alloys, and welding gas mixtures.
Abstract: The present invention provides a welding system and methodology to facilitate an improved fillet weld. The system includes an arc welding subsystem providing a fillet weld that joins one or more members. The arc welding subsystem controls one or more welding parameters and utilizes one or more controlled process variables, to facilitate geometric control of a toe angle, a toe radius, a throat dimension and a penetration depth associated with the joining of the fillet weld and the one or more members. The present invention also includes optimized welding parameters, welding wire alloys, and welding gas mixtures to promote an improved fillet weld.

32 citations

Patent
01 Jul 1988
TL;DR: In this paper, the surface tension in the globule created at the site of the impingement of the laser beam on the work to form finished edges on both sides of the line of cut is used, the gas removing some of the molten metal but leaving sufficient to form the beads which comprise the finished edges.
Abstract: A method of simultaneously cutting and welding metal, especially relatively thin sheets of metal, utilizing laser energy. The invention uses surface tension in the globule created at the site of the impingement of the laser beam on the work to form finished edges on both sides of the line of cut. A laser beam surrounded by a gaseous shield is used, the gas removing some of the molten metal but leaving sufficient to form the beads which comprise the finished edges on both sides of the cut. Using compressed air, as compared to an inert gas such as helium or argon, as the shield gas produces a significant cost savings at the "price" of some reduction in quality due to oxidation.

32 citations

Journal ArticleDOI
TL;DR: In this paper, a study was carried out to measure the effective efficiency of different gas shielded arc welding processes and investigate the role of influence coefficients on the process efficiency, showing that the difference between the lowest and highest achievable value of efficiency can be more than 15 % for one specific welding process.
Abstract: A study was carried out to measure the effective efficiency of different gas shielded arc welding processes and investigate the role of influence coefficients on the process efficiency. A new system to measure the integrated heat flow in welding processes was developed and further investigated. By this system, it can be shown how e.g. electrical and welding torch parameters, as well as material and gas parameters directly influence the efficiency of the welding process. Through this, it is possible to raise the efficiency of welding (processes for example by reducing the wire speed, using helium gas or increasing the distance of the welding torch to the metal plate. Contrary, increasing the current, welding speed or voltage reduces the process efficiency. The difference between the lowest and highest achievable value of efficiency can be more than 15 % for one specific welding process. In addition to the conventional welding processes like gas tungsten arc welding (GTAW), gas metal arc welding (GMAW) and plasma welding also latest technologies, such as heat reduced processes (for example controlled dip arc with or without wire pullback) and high performance welding processes were analysed. In this manuscript, primarily the new technology for measuring the efficiency is presented. Furthermore, different influence coefficients and their effects on the overall efficiency of welding processes are described. Finally, the differences between measured efficiencies and fixed values of efficiencies for welding processes given in standards are discussed. The efficiencies of the latest heat reduced and high performance welding processes are given. The results verify that the parametrical influence on the efficiency of welding processes is huge, so that it is not recommended to work with fixed efficiency values for example in modeling and simulation.

32 citations

Journal ArticleDOI
TL;DR: In this paper, the influence of specific flux powders, including FeF2, FeO, and FeS, on the surface appearance, geometric shape, angular distortion, hot crack susceptibility, and metallurgical properties of 5-mm-thick 17Cr-10Ni-2Mo alloys welded using the tungsten inert gas (TIG) process was investigated.

32 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202357
2022103
2021107
2020168
2019206
2018206