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, a systematic study of the effects of activating flux in the weld morphology, arc profile, and angular distortion and microstructure of two different arc welding processes, namely, Gas Tungsten Arc Welding (GTAW) and plasma arc welding (PAW), was carried out.
Abstract: A systematic study of the effects of activating flux in the weld morphology, arc profile, and angular distortion and microstructure of two different arc welding processes, namely, Gas Tungsten Arc Welding (GTAW) and Plasma Arc Welding (PAW), was carried out. The results showed that the activating fluxes affected the penetration capability of arc welding on stainless steel. An increase in energy density resulting from the arc constriction and anode spot reduction enhanced the penetration capability. The Depth/Width (D/W) ratio of the weld played a major role in causing angular distortion of the weldment. Also, changes in the cooling rate, due to different heat source characteristics, influenced the microstructure from the fusion line to the centre of the weld.
34 citations
Patent•
20 Aug 1971TL;DR: Welding methods and apparatus for bonding a metallic end plug into an end of a metallic fuel tube or rod for a nuclear reactor are described in this paper, where defects in the weld joint between the fuel tube and end plug are substantially reduced by arc welding in a chamber filled with an inert gas, disposing the welding electrode directly over the joint to be welded, deflecting plasma produced during the welding away from the body of the nuclear tube and directing the plasma into the joint.
Abstract: Welding methods and apparatus for bonding a metallic end plug into an end of a metallic fuel tube or rod for a nuclear reactor. Defects in the weld joint between the fuel tube and end plug are substantially reduced by arc welding in a chamber filled with an inert gas, disposing the welding electrode directly over the joint to be welded, deflecting plasma produced during the welding away from the body of the fuel tube, and directing the plasma into the joint.
34 citations
Patent•
07 Nov 1978
TL;DR: In this article, a coaxial multiple tube burner is used to deposit glass fine particles on the outside of rotating starting material by flame hydrolysis, and the resulting laminar deposit is introduced into a high temp. furnace provided with many gas introduction openings in the inner wall.
Abstract: PURPOSE:To obtain the title material with little light absorption loss by forming a laminar deposit of glass fine particles by flame hydrolysis after which the deposit is heated in a fluorine cpd. gas atmosphere and sintered in an inert gas atmosphere to reduce the OH group concn. of the glass. CONSTITUTION:Oxygen 2, hydrogen 3, shielding gas 4 and feed gas 5 are fed into coaxial multiple tube burner 1 made of quartz to deposit glass fine particles on the outside of rotating starting material 6 by flame hydrolysis. The resulting laminar deposit of glass fine particles is introduced into a high temp. furnace provided with many gas introduction openings 8 in the inner wall. In the furnace the deposit is heated to 1000 deg.C or below while supplying a fluorine cpd. gas such as fluorocarbon gas or sulfur fluoride gas from gas supply inlet 9 to obtain a glass fine particle body whose outer circumference portion contains much fluorine. This body is then put into high temp. furnace 10 of an inert gas atmosphere and sintered at 1400 deg.C or above to convert it into transparent glass.
34 citations
Patent•
02 Feb 1987
TL;DR: In pulsed arc welding with a consumable electrode and a shielding gas mixture of argon, helium and carbon dioxide, the helium content being in the range from about 16% to about 25% and the carbon dioxide content being from about 1% to 4% as discussed by the authors.
Abstract: Metal deposition rate is increased with reduced energy input in pulsed arc welding with a consumable electrode and a shielding gas mixture of argon, helium and carbon dioxide, the helium content being in the range from about 16% to about 25% and the carbon dioxide content being from about 1% to 4%. The component gases are stored in separate containers until the welding operation during which precisely metered flows of each are entrained by a metering valve and directed to the weld region. Consistently finished welds are produced, on stainless steel, low alloy steels and nickel based alloys as well as other weldable ferrous metals, including during out of position welding operations.
34 citations
TL;DR: In this paper, two colour pyrometry was conducted to obtain the surface temperature of weld pools, in which the weld pool was photographed by a high speed camera during arc welding.
Abstract: In this research, two colour pyrometry was conducted to obtain the surface temperature of weld pools, in which the weld pool was photographed by a high speed camera during arc welding. Two wavelengths (950 and 980 nm) of light in the infrared range were selected from the thermal radiation light emitted from the weld pool at the instant when the arc was extinguished, using an imaging spectroscope. Consequently, in gas tungsten arc welding, it was shown that the surface temperature distribution of a weld pool is affected by the sulphur content in the base metal. It is thought that this temperature distribution is determined by the balance between the driving forces of viscous drag from the cathode jet of plasma and Marangoni surface tension. In gas metal arc welding, it was seen that the surface temperature distribution becomes uniform and the temperature is 1715–1845 K, which is obviously lower than that of the metal droplet.
34 citations