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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 article, two sets of vision-based sensing systems were established to investigate the behavior of droplet transfer, arc shape and molten metal flow by varying shielding gas mixtures.

18 citations

Patent
11 Feb 2011
TL;DR: In this article, a welding cable connector system with a male connector and a female connector is presented, where the male and female connectors are mutually engageable to conduct welding power and shielding gas therethrough.
Abstract: A welding cable connector system having a male connector (48) and a female connector (50). The male connector includes a first conductive body for conveying welding power. The male connector also includes a first sealed passageway disposed coaxially of the first conductive body for conveying shielding gas, and a first Schrader valve (134) configured to stop flow of shielding gas when the male connector is not engaged. The female connector includes a second conductive body for conveying welding power. The female connector also includes a second sealed passageway disposed coaxially of the conductive body for conveying shielding gas, and a second Schrader valve (156) configured to stop flow of shielding gas when the female connector is not engaged. The male and female connectors are mutually engageable to conduct welding power and shielding gas therethrough. The first and second Schrader valves seal the flow of shielding gas when the connectors are not mutually engaged.

18 citations

Journal Article
TL;DR: In this paper, a procedure has been developed to characterize welding fume generated from arc welding processes that includes the measurement of fume generation rate (FGR), fume particle size, and mass distribution, and the morphology, chemistry, and composition of the fume.
Abstract: A procedure has been developed to characterize welding fume generated from arc welding processes that includes the measurement of fume generation rate (FGR), fume particle size, and mass distribution, and the morphology, chemistry, and composition of the fume. Fume was collected using both a state-of-the-art collection chamber and an electrical low-pressure impactor (ELPI), the former designed to optimize fume collection and the latter allowing fume to be segregated into 12 size ranges from 0.03 to 10 μm. Detailed characterization of fume particles was conducted using a combination of x-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), x-ray energy dispersive spectroscopy (XEDS), and x-ray photoelectron spectroscopy (XPS). These techniques, when used collectively, provide extensive information on welding fume particle structure, composition, and morphology. Using the ELPI, composition and morphology can be studied as a function of particle size. In this paper, the collection and analysis procedure is described in detail, and an example analysis of the ER70S-6 welding wire is provided. Welding fume characterization methods were performed on fume generated by gas metal arc welding (GMAW) of the ER70S-6 welding wire with 100% CO 2 and 75%Ar-25%CO 2 shielding gases. The combined techniques provide a comprehensive understanding of the fume generated by arc welding consumables.

18 citations

Journal ArticleDOI
TL;DR: In this article, different calorimetric measurement methods and results for the separate determination of the energy content of droplet and welding arc as well as energy input into the component are presented.
Abstract: Within this manuscript, the comprehensive heat flow, as well as the energy balance for gas-shielded arc welding processes based on experimental investigations is discussed. The main focus lies on the gas metal arc welding (GMAW) process which is further analysed. Different calorimetric measurement methods and results for the separate determination of the energy content of droplet and welding arc as well as energy input into the component are presented. Additionally, heat losses to the surrounding atmosphere and the cooling energy of the external cooling power source system are analysed. The mean droplet temperatures are within a range of T dr = 2,350 … 2,700 °C. The studies also show that a specific manipulation of the droplet temperature during the welding process is not possible and droplet temperature depends on several parameters. Increasing the wire feed speed, reducing the diameter of the filler material or increasing the stick out length result in an increase of the droplet temperature. The analyses allow to conclude that the welding arc is mainly responsible for the weld seam penetration and the droplet temperature only contributes in a minor manner. Preliminary experiments also show that the heat input into the component is highly influenced by the selection of welding parameters. Measurements confirm that it is possible to increase the efficiency of welding processes for example by reducing the wire feed speed, using carbon dioxide shielding gas or increasing the stick out length. On the contrary, increasing the current or voltage or reducing the shielding gas flow 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.

18 citations

Journal ArticleDOI
01 Sep 2004
TL;DR: In this article, an experimental investigation on ASTM 304 stainless steel was carried out to determine the influence of surface melting parameters, using a novel diode laser with rectangular and uniform energy distribution across the beam spot, on the shape, penetration depth, structure and microhardness of surface layers.
Abstract: Recent investigations on the laser surface treatment of nickel-based alloys and austenitic stainless steels had shown that it is possible to increase additionally their pitting and erosion-corrosion resistance and also wear resistance as a result of laser surface alloying and laser surface melting. Austenitic stainless steel is one of the most widely used ferrous materials for structural applications in mild to very severe oxidizing environments due to its excellent corrosion resistance, mechanical strength and ductility. Therefore, an experimental investigation on ASTM 304 stainless steel was carried out to determine the influence of surface melting parameters, using a novel diode laser with rectangular and uniform energy distribution across the beam spot, on the shape, penetration depth, structure and microhardness of surface layers. The sample surface was treated using the continuous-wave high-power diode laser with a maximum output power of 2.5 kW. The surface of 304 stainless steel was melted in argon, nitrogen and air atmospheres using different laser output powers at a scanning speed of 500 mm/min. Surface layers after laser melting presented higher microhardness compared with the untreated material. In laser surface melting, a rapidly resolidified surface layer with refined grains of 300 μm thickness was obtained, and the penetration depth of surface layers was in the range 0.3-5.0 mm.

18 citations


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