Shielding gas

About: Shielding gas is a research topic. Over the lifetime, 6697 publications have been published within this topic receiving 58668 citations.

Inert gas welding

Abstract: Welding apparatus for inert gas shielded arc welding comprising a welding gun for holding and controlling a non-consumable electrode and including means for supplying inert gas to the welding arc region by way of a gas cup surrounding but spaced from such an electrode when positioned in the gun, the welding gun being further provided with an extended gas shielding wall arrangement protruding a substantial distance beyond the gas cup and capable, either by itself or in combination with a narrow gap weld preparation, of substantially enclosing an electrode in the gun, except for its tip, when the electrode is protruding for a similar distance beyond the gas cup.

Method and apparatus for hybrid welding under shielding gas

Abstract: A hybrid welding from a combination of laser beam welding with gas-shielded welding by electric arc uses at least two electrodes are used The electrodes can be flooded by a common shielding gas curtain or separately or in groups The hybrid welding increases the possibility of influencing the welding process and especially provides improved possibilities for automation

Method and device for gas shielding laser processed work pieces

Abstract: On an apparatus (10) for laser processing workpieces (18), and whereby a laser beam (11) is directed on to a portion (13) of a substantially perpendicular work surface (14), a jet (21) of shielding gas is fed over the work surface portion (13) crosswise in relation to the laser beam (11) and at such high speed as to substantially prevent any alteration of the physical and/or chemical properties of the gas. The jet (21) is supplied along a solid-walled conduit (26) comprising two transverse openings (29, 31) for the passage of the beam (11) on to the work surface portion (13); and a nozzle (32) for producing a gas jet (21) of appropriate speed.

Method for laser welding steel sheets and composite material

Abstract: A method for laser welding steel sheets in which a gas mixture comprising at least one of argon, helium and nitrogen, and 20 to 50% by volume of a carbon dioxide gas, or a gas mixture comprising at least one of argon, helium and nitrogen, 10 to 40% by volume of a carbon dioxide gas and 1 to 5% by volume of an oxygen gas is used as a shield gas.

Measurement of arc pressure and shield gas pressure effect on surface of molten pool in TIG welding

Abstract: Tungsten inert gas (TIG) welding is most frequently used for arc study because it is clean and easy to control welding factor. Many researchers have been focused on the plasma stream to find out the relationship between vertex angle and penetration of the tungsten electrode in TIG welding. Moreover, researchers studied the characteristics of vertex angle and arc pressure and heat flux distribution of the tungsten electrode. In addition, they have carried out factors that have influence on the behaviour of the molten pool. Previous studies assumed that arc pressure was dominant for the force that physically works on the surface of the molten pool, neglecting the shield gas pressure. In addition, they have been focused on the protection of molten weld pool from exposure to the atmosphere. The object of this study is to investigate the effect of shield gas pressure on the surface of the molten pool by measuring the distribution of arc pressure and shield gas pressure compared with arc physical result...