Topic
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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TL;DR: In this paper, the effects of laser power, welding speed, focal position, shielding gas and zinc vaporization on welding quality of high-strength galvanized steel sheets are investigated.
80 citations
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22 Jan 1997TL;DR: An article made of a nickel-base superalloy having a nilductility range from the solidus temperature of the alloy to about 600° F. is welded, as for example in the weld repair of surface cracks, by removing foreign matter from the area to be welded as discussed by the authors.
Abstract: An article made of a nickel-base superalloy having a nil-ductility range from the solidus temperature of the alloy to about 600° F. below the solidus temperature is welded, as for example in the weld repair of surface cracks, by removing foreign matter from the area to be welded, first stress relieving the article, adjusting the temperature of the article to a welding temperature of from about 1800° F. to about 2100° F., welding a preselected area in an inert atmosphere at the welding temperature, and second stress relieving the article. Welding is preferably accomplished by striking an arc in the preselected area so as to locally melt the alloy in the preselected area, providing a filler metal having the same composition as the nickel-based superalloy of the article, and feeding the filler metal into the arc so that the filler metal is melted and fused with the article to form a weldment upon solidification.
80 citations
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06 Feb 1996
TL;DR: In this article, an improved welding system incorporating a novel torch mounted gas scavenging system which removes and filters contaminant gases from the workplace and incorporates an enclosure which creates high turnover rates of shielding gases at the weld pool thereby preventing contaminant gas induced defects, and which insulates the heat affected area thereby prolonging the cooling process of the welding pool, effectively reducing porosity and other related defects.
Abstract: Disclosed is an improved welding system incorporating a novel torch mounted gas scavenging system which removes and filters contaminant gases from the workplace and incorporates an enclosure which creates high turnover rates of shielding gases at the weld pool thereby preventing contaminant gas induced defects, and which insulates the heat affected area thereby prolonging the cooling process of the weld pool, effectively reducing porosity and other related defects, and which provides the capability of accurately monitoring and displaying specific measurements of an ongoing welding operation such as humidity, ambient frequencies, internal temperature and pressure in the enclosure, and on line acoustic emissions sensors which indicate the presence or absence of defects as the weld is being made. The system also has an auxiliary gas source which is independently controlled from the primary shielding gas flow, which allows the introduction of auxiliary gas flows into the enclosure without disturbing the primary gas flow pattern.
79 citations
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TL;DR: In this article, a high power laser-metal inert gas (MIG) hybrid welding of AZ31 Mg alloys was studied, where the arc was compressed and stabilized by the laser beam during the hybrid welding.
79 citations
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TL;DR: In this paper, a new chamber for laser welding under low vacuum conditions achieved by using rotary pumps was developed, and high-power disk laser bead-on-plate welding was performed on Type 304 stainless steel or A5052 aluminium alloy plate at the powers of 10, 16 and 26 kW at various welding speeds under low-vacuum conditions.
79 citations