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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
07 Jan 1993
TL;DR: In this article, a process for the electric welding of two weld parts by the flow of electric current through a welding point and the use of fluid such as an inert or protective gas to inhibit or prevent or eliminate oxidation at the welding point is described.
Abstract: The invention relates to a process for the electric welding of two weld parts by the flow of electric current through a welding point and the use of fluid such as an inert or protective gas to inhibit or prevent or eliminate oxidation at the welding point. The fluid is supplied through a continuous bore in one weld part and is directed toward the welding point, so that the fluid sweeps over the welding point radially from the bore. The fluid may be an inert gas such as argon or nitrogen, optionally mixed with carbon dioxide; alternatively the fluid may be aqueous liquid, the water being vaporized in the region of the welding point.

28 citations

Patent
11 Sep 1956
TL;DR: In this article, an inert gas shield for arc-welding materials such as zirconium that tend to oxidize rapidly in air is presented, where the welding electrode is introduced through a rubber diaphragm to provide flexibility and the front of the box is provided with a small hole through which flller metal is introduced.
Abstract: S>An inert gas shield is presented for arc-welding materials such as zirconium that tend to oxidize rapidly in air. The device comprises a rectangular metal box into which the welding electrode is introduced through a rubber diaphragm to provide flexibility. The front of the box is provided with a wlndow having a small hole through which flller metal is introduced. The box is supplied with an inert gas to exclude the atmosphere, and with cooling water to promote the solidification of the weld while in tbe inert atmosphere. A separate water-cooled copper backing bar is provided underneath the joint to be welded to contain the melt-through at the root of the joint, shielding the root of the joint with its own supply of inert gas and cooling the deposited weld metal. This device facilitates the welding of large workpieces of zirconium frequently encountered in reactor construction.

28 citations

Journal ArticleDOI
TL;DR: In this article, the authors compared thirteen shielding gases and their impact on FFR and fume particle while welding in the spray transfer regime, and found that CO2 additions in Ar-based shielding gases are the controlling factor in determining FFR due to the effect of CO2 on welding arc characteristics.
Abstract: The present paper compares thirteen shielding gases and their impact on FFR and fume particle while welding in the spray transfer regime. There was no obvious influence from the shielding gas on particle composition and fume particles were identified as (Fe,Mn)3O4. There was a slight peak shift that indicated that small levels of Mn, as detected by TEM-EDS, substituted for Fe in the Fe3O4 phase.Shielding gas composition is an important parameter for successful gas metal arc welding (GMAW) and has been shown to affect the fume formation rate (FFR). In Ar-based mixtures, increasing CO2 had a greater impact than raising O2 on FFR. When O2 was increased in ternary mixtures, the FFR increased for Ar–5%CO2 but no discernable increase was observed for the Ar–12%CO2 mixtures. Results indicate that CO2 additions in Ar-based shielding gases are the controlling factor in determining FFR due to the effect of CO2 on welding arc characteristics. Ar–He–CO2 mixtures had the most stable FFR's.

27 citations

Journal ArticleDOI
TL;DR: In this paper, the welding properties for the components of an aluminum-alloy ultra-high vacuum chamber and beam position monitor (BPM) were discussed, and the welding parameters include the modes of laser output (pulsed wave and continuous wave), welding speed, shield gas flow, welding bead structure, and focusing distance.

27 citations

Patent
02 Aug 1973
TL;DR: In this article, a high speed stream of water is directed from a nozzle on the welding torch obliquely onto a member or members to be welded to form a flared-out curtain of water.
Abstract: The invention relates to a welding torch for welding underwater and to a method of underwater welding using the welding torch. A high speed stream of water is directed from a nozzle on the welding torch obliquely onto a member or members to be welded to form a flared-out curtain of water. Gas is injected into the volume enclosed by the curtain of water to create a gaseous atmosphere and welding is carried out in the gaseous atmosphere.

27 citations


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