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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01 Apr 1989-Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science
TL;DR: In this paper, the emission spectra of the plasma during pulsed laser welding of AISI 201 stainless steel under various welding conditions were derived from various locations in the plasma plume.
Abstract: The rates of vaporization of alloying elements from the weld pool were related to the emission spectra of the plasma during pulsed laser welding of AISI 201 stainless steel under various welding conditions. The temperature distribution in the plasma was determined from the spectra obtained from various locations in the plasma plume. The extent of ionization of the plasma was calculated from the electron temperatures To understand the role of surface active elements, emission spectra and the vaporization rate of iron that resulted from the welding of ultrapure iron samples were compared with those from the welding of oxidized samples or samples that were doped with sulfur or oxygen.
48 citations
Patent•
24 Jul 1992
TL;DR: In this paper, a collector electrode and adjacent electric weld torch are placed at a selected distance from a work surface or substrate to generate an electric welding current, which forms a welding current arc between the collector and the weld torch.
Abstract: A collector electrode and adjacent electric weld torch are placed at a selected distance from a work surface or substrate. An electric welding current is generated so that a welding current arc forms between the collector electrode and the weld torch. A feed metal is then fed into the welding current arc and is melted into molten metal adjacent to the collector electrode. The molten metal is then deposited onto a work surface. The collector electrode and weld torch are positioned so that the welding current arc between the weld torch and the collector electrodes does not penetrate the work surface or the already-deposited metal.
48 citations
Journal Article•
TL;DR: In this article, an arc light sensor has been developed to deect argon atom spectral lines in gas tungsten arc welding, and the relationship between the argon lines and the welding parameters has been derived from the theoretical model.
Abstract: Sensing plays a key role in automating and controlling welding processes. In recent decades, arc light sensing has been studied for arc length control, joint tracking and droplet trans- fer detection in arc welding. However, the current technology relies on experi- mental data and lacks theoretical foun- dation. To improve measurement accu- racy, this work addresses the theoretical foundation for arc light sensing. A theo- retical model has been developed to cor- relate arc light radiation to welding pa- rameters. Distributions of different radiant sources in the arc column are studied. It is found that the distributions of the ions of the shielding gas and the vapors of the base metal and tungsten are not even, while that of the shielding gas atoms is. This suggests the spectral lines associated with the shielding gas atoms can be used to improve the accu- racy of arc light sensing. Hence, an arc light sensor has been developed to de- tect argon atom spectral lines in gas tungsten arc welding. The relationship between the argon lines and the welding parameters has been derived from the theoretical model. Joint tracking exam- ples showed the effectiveness of the de- veloped method in improving accuracy.
47 citations
TL;DR: In this article, a new technology that alternately supplies the different kinds of shielding gases in weld zone has been developed to increase the welding quality and reduce the energy consumption and emission rate of fume.
47 citations
TL;DR: In this paper, the effects of welding method, peak temperature, and cooling rate on the susceptibility to intergranular corrosion of alloy 690 weldments were investigated, and the experimental results reveal that the laser beam welding process with cooling rate of around 212.6°C/s can be produced with much less mass loss and a lower value of maximum reactivation current density/maximum anodic current density than with the gas tungsten arc welding process, where cooling rate is at around 17−20.6
47 citations