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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
Jijin Xu1, Jingyao Chen1, Yi Duan1, Chun Yu1, Junmei Chen1, Hao Lu1 
TL;DR: In this article, a combined heat source model involving two-part conical models and a cylindrical model was dramatically developed to predict the thermal process of laser beam welding, and a double ellipsoid heat source was employed to simulate the tungsten inert gas welding process.

36 citations

Patent
Yuji Yamada1, Tohru Ishikawa1, Yuichi Motora1, Yoichi Masuda1, Yasuda Toshihiro1 
27 Jun 1996
TL;DR: In this article, the TIG welding method was improved with the use of an inner and outer shield gas flow means to prevent the molten pool from being oxidized and to prevent oxygen in air from being involved.
Abstract: A TIG welding method is usually carried out in a manner that a tungsten electrode is inserted into a weld groove portion of a member to be welded, an electric voltage is applied to a current conducting portion provided for the tungsten electrode while flowing a shield gas means to thereby generate an arc between the tungsten electrode and the member to be welded to form a molten pool of the member, a welding wire is inserted into the molten pool, and a welding torch is then operated to perform a welding process In the improvement of the TIG welding method, the shield gas means is composed of an inner shield gas (13) flowing from a periphery of the tungsten electrode (3) to a front end thereof inserted into the weld groove portion (2a) of the member (1a) to be welded and an outer shield gas (14) flowing towards the weld groove angle from an outside of the inner shield gas (13) to prevent the molten pool from being oxidized and to prevent oxygen in air from being involved The TIG welding torch for carrying out the method is specifically provided with the inner and outer shield gas flow means, and further provided with a central shield gas flow means

36 citations

Patent
22 Sep 1986
TL;DR: In this paper, a method for laser welding two sheets of metal, the metal being of the type having associated gases tending to be trapped and expand in the weld zone during welding due to heat from the laser.
Abstract: A method is disclosed for laser welding two sheets of metal, the metal being of the type having associated gases tending to be trapped and expand in the weld zone during welding due to heat from the laser. These expanded gases tend to separate the upper and lower portions of the weld zone and/or expand through the weld zone toward the laser beam to create porosity in the final weld. Such metal may be coated, such as galvanized steel, in which case the zinc vaporizes into a gas in the weld zone between the adjacent sheets, or it may be poorly fitting sheets, in which case air is trapped in surface irregularities between the sheets. In either case, the method adds to the standard laser beam a surrounding stream of pressurized shield gas effective to create a pressure at the surface of the weld zone sufficient to force the molten metal of the two sheets together and force the expanded associated gases out of the weld zone in a direction away from the laser beam, whereby a non-porous weld may be created. The pressure is higher than that of shield gas in the prior art used for protection from oxygen or dispersal of plasma. Specific pressure ranges are disclosed for argon and helium.

36 citations

Patent
08 May 1969
TL;DR: In this paper, an inert gas welding torch is used to create plasma by directing one or more discrete high velocity jet gas streams into a welding arc between the electrode and the workpiece.
Abstract: An inert gas welding torch is used to create plasma by directing one or more discrete high velocity jet gas streams into a welding arc between the electrode and the workpiece. The plasma stream is controllable with regard to energy content or location by varying the amount or direction of the inert gas flow. The plasma stream is insensitive to variations of arc length, and permits abnormally high current densities in the electrode. When used with consumable electrodes, the invention is useful for casting as well as for deep welding heavy plate materials in a single pass.

36 citations

Journal ArticleDOI
TL;DR: In this paper, the results of keyhole laser beam welding of dissimilar magnesium alloys that have been carried out with the CO 2 laser of maximum power of 25kW were presented.

36 citations


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