Shielding gas

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

Magnesium alloy weld using manganese chloride coated wire

Abstract: Magnesium alloy was welded with normal wire and activated flux coated wire. Weld bead penetration, arc voltage, arc profiles and welding arc electronic temperature were researched. Weld bead penetration, arc voltage and welding arc electronic temperature increased when activated flux coated wire was used. It is also found that the welding arc constricted in flux coated wire weld. It is believed that deep weld penetration associated with flux coated wire in this experiment is caused by arc constriction.

Welding of invar Fe-36Ni alloy for tooling of composite materials

Abstract: Summary Invar alloy has traditionally been used almost exclusively in the manufacture of high-precision measuring instruments. Recently, however, new structural uses, such as the manufacture of bulky composite tooling for the aerospace industry, have forced us to reconsider all the welding procedures previously used. The aim of this research is to investigate some of the problems of welding Invar, proposing practical solutions based on experience. Several issues were considered: i.e. precautions regarding purity of inert shielding gas and the absence of surface residue, the role of titanium added to the filler metal, sensitivity of the alloy to reheat cracking and the existence of precipitates and inclusions, etc. The presence of characteristic banding in the weld pool, its origin and effects on joint properties, were also investigated.

Self-cleaning nozzle for a gas welding torch

Abstract: A welding torch for gas metal arc welding has a torch body which conducts electricity, receives a cable for directing a welding wire, and defines a passage for directing a shielding gas. A conductor tube has an inner end portion secured to the torch body and a free outer end portion, and a contact tip is secured to the outer end portion of the conductor tube. The contact tip has a central bore which directs the welding wire through the tip, and a diffuser directs the shielding gas around the contact tip and conducts electrical power to the contact tip. A tubular welding nozzle body is formed of a porous polycrystalline graphite material and has a slightly tapered inner surface which surrounds the contact tip for collimating the gas while substantially reducing the accumulation of spatter on the nozzle body. The contact tip may also be covered with the same graphite material to impede spatter accumulation, and the porous graphite material is impregnated with petrolatum and wax to extend the service life of the body. The tubular nozzle body may be protected by a surrounding copper jacket, and an interfitting band of ceramic material retains the body within the jacket.