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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.


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Patent
15 Mar 1967
TL;DR: In this article, a special welding electrode consisting of a composite wire and adapted for use in CO2 shield gas arc welding, is described, which is a welding electrode comprising a tubular outer casing of mild steel having a central hollow and a filler enclosed in said central hollow, composed of ferromanganese in an amount not less than 1.0 percent but not more than 2.2 percent.
Abstract: Special welding electrode consisting of a composite wire and adapted for use in CO2 shield gas arc welding, said welding electrode comprising a tubular outer casing of mild steel having a central hollow and a filler enclosed in said central hollow and composed of ferromanganese in an amount not less than 1.0 percent but not more than 2.2 percent based on manganese of the weight of the electrode, ferrosilicon in an amount not less than 0.3 percent but not more than 0.9 percent based on silicon of the weight of the electrode, ferroaluminum in an amount not less than 0.05 percent but not more than 0.8 percent based on aluminum of the weight of the electrode, an arc stabilizer consisting of a salt or oxide of alkali metal in an amount not less than 0.1 percent but not more than 3.0 percent of the weight of the electrode and the remainder of iron powder which may be added as required.

20 citations

Journal ArticleDOI
TL;DR: In this article, a theoretical model of a gas metal arc welding system was developed to make predictions of the anode temperature profile, welding arc length and arc current, for spray transfer.
Abstract: A theoretical model of a gas metal arc welding system has been developed to make predictions of the anode temperature profile, welding arc length and arc current. The model incorporates a one-dimensional thermal model of the moving consumable anode and a two-dimensional model for the arc plasma. The model makes possible the calculation of the relationship between the welding arc current, wire feed rate and the supply voltages, for various wire diameters and shielding gases. The predicted welding current for a given wire feed rate shows good agreement with our experimental observation for operation in the spray transfer mode, for steel wire of two different diameters, assuming a workpiece sheath voltage of 15 V.

20 citations

Patent
18 Apr 2011
TL;DR: In this article, a method and system for detecting a welding gas leak is provided, where one welding power supply includes a gas valve configured to control the flow of shielding gas to a welding device through a gas line.
Abstract: A method and system for detecting a welding gas leak is provided. One welding power supply includes a gas valve configured to control the flow of shielding gas to a welding device through a gas line. The welding power supply also includes a sensor coupled to the gas line and configured to detect a parameter of the shielding gas. The welding power supply includes control circuitry coupled to the gas valve and to the sensor, and configured to control the operation of the gas valve, and to receive device value representative of the detected parameter. The control circuitry is further configured to determine a leak test result based upon the parameter value, and to provide an operator indicator of the leak test result.

20 citations

Journal ArticleDOI
TL;DR: In this article, the authors reviewed past research findings on GTA welding of ASS and FSS and confirmed that welded joints particularly, heat affected zones (HAZs) of both grades of steels can undergo mechanical failure and can be susceptible to corrosion attack if the joints are produced with a less ideal combination of welding parameters.
Abstract: Welding as a fabrication process is one of the vital production routes for most manufacturing industries. Several factors are involved in the choice of welding process for specific applications; notable among these are compositional range of the material to be welded, the thickness of the base materials and type of current. Most metals oxidize rapidly in their molten state, and therefore, the weld area needs to be protected from atmospheric contamination; this is achieved in gas tungsten arc welding GTAW by a shielding gas (argon, helium, nitrogen). GTAW technique is one of the major processes for joining austenitic stainless steels (ASS) and ferritic stainless steel (FSS) fabrication. However, the microstructural change that occurs during welding and at weld joint is still a major challenge today as it affects both the corrosion resistance and the mechanical properties. Therefore, this present paper reviews past research findings on GTA welding of ASS and FSS. Results of the findings have confirmed that, depending on the amount of heat input, which can be controlled by welding parameters (welding speed, voltage and current), welded joints particularly, heat affected zones (HAZs) of both grades of steels can undergo mechanical failure and can be susceptible to corrosion attack if the joints are produced with a less ideal combination of welding parameters.

20 citations

Journal ArticleDOI
TL;DR: In this article, a hybrid laser-arc welding (HLAW) of 10CrNi3MoV steel was carried out with different shielding gas mixtures including 100% Ar, 5% CO2 + Ar, 10% CO 2+Ar, 15% CO++ Ar, 20% CO&Ar, 25% CO* + Ar and 100% CO• Ar. The results showed that the increase of CO2 content increased synergetic effect, especially the energy density of laser, and improved the penetration.

20 citations


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