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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Patent•
22 Sep 1971TL;DR: In this paper, a welding gun nozzle including a first passageway through which welding wire may be fed into a weld and a second passagway through which shielding gas may be directed over the weld to protect the molten metal from contamination.
Abstract: A welding gun nozzle including a first passageway through which welding wire may be fed into a weld and a second passageway through which shielding gas may be directed over the weld to protect the molten metal from contamination. The nozzle also includes a fume extracting passageway having an inlet orifice so located with respect to the outlet end of the nozzle that the fumes are drawn into the nozzle from a region laterally outward from the nozzle, and thus from an area removed from the weld, so the shielding gas is relatively unaffected by the operation of the fume extracting feature of the invention.
24 citations
Patent•
14 Apr 1997
TL;DR: In this article, a semi-automatic TIG welding apparatus is described, where a TIG welder can freely adjust the position of the welding wire, and wherein the welding wires can be inserted to an ideal position, and also wherein the wire-feeding curved nozzle and thus the wire do not fluctuate in position.
Abstract: A semi-automatic TIG welding apparatus including a torch handle, a wire-feeding curved nozzle which is disposed within the torch handle and is curved at a point slightly extended from the torch handle, and a TIG torch supporting arm which is fixed to a TIG torch having a shielding gas hose and center gas hose. An inside portion of the TIG torch supporting arm is formed of an electroconductive material. The apparatus further includes water-cooling welding cable hoses which are attached to a water tank, extend through the inner side of the torch handle, and are attached to the TIG torch. The water-cooling welding cable hoses being formed with electroconductive cables provided therein. The apparatus may additionally include a TIG torch rotation block which is rotatably mounted to the wire-feeding curved nozzle and fixed to the TIG torch supporting arm. Thus, a semi-automatic TIG welding apparatus is provided wherein a TIG welder can freely adjust the position of the welding wire, and wherein the welding wire can be inserted to an ideal position, and also wherein the wire-feeding curved nozzle and thus the wire do not fluctuate in position, resulting in great savings in the expense and time related to TIG welding, and also in the amount of labor on the part of the welder.
24 citations
TL;DR: In this article, the authors applied gas tungsten arc welding in order to join AISI 304 and aISI 201 stainless steels, and found the optimum welding condition that gave a weld bead in accordance with DIN EN ISO 25817 quality level B, pitting corrosion potential of the weld metal of not less than that of the A ISI 304 base metal and a ratio of delta-ferrite in austenite matrix of the steels of not lower than 3%.
24 citations
24 citations
25 Apr 2009-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, a combination of nitrogen alloying and microstructural refinement was used to increase the yield strength and hardening rate of the weld region in tungsten inert gas welding.
Abstract: Strengthening Hadfield steel weld repairs by introducing nitrogen into the weld region was proven to be feasible via two welding techniques. The first technique required a pure Hadfield steel filler material to be diffusion treated in a high pressure nitrogen gas environment, and subsequently used during tungsten inert gas welding with a pure argon shielding gas. The second technique used a Hadfield steel filler material, and a 10% nitrogen containing argon shielding gas during tungsten inert gas welding. Both techniques increased the yield strength, the hardening rate, and the ultimate strength of the weld region. Using optical microscopy, scanning electron microscopy, and Auger spectroscopy, we determined that the increased strength of the weld region resulted from a combination of nitrogen alloying and microstructural refinement.
24 citations