Abstract: A gas mixture for laser beam fusion cutting is disclosed. The gas mixture essentially contains N2 and smaller fractions of O2 and H2. The gas can be produced in an extremely cost-effective manner by the enrichment of a starting product consisting of impure nitrogen that contains 1-6% O2 with H2.

Abstract: A method of gas-shielded metal arc joining using a consumable electrode having an alternating polarity (GMA-AC). A shielding gas containing helium is used to improve process stability and working speed.

Abstract: A method of gas-shielded metal arc joining using a consumable electrode having an alternating polarity (GMA-AC). A shielding gas containing helium is used to improve process stability and working speed.

Abstract: In joining heterogeneous materials that differ in their melting points, a shielding gas mixture with active gas content is utilized. In particular, the shielding gas mixture contains helium and active gasses in the vpm range (0.005 to 0.5% by volume). These shielding gases to lead to the production of high quality joints when joining aluminum and steel.

Abstract: A method of arc-joining a workpiece with a consumable electrode and with the use of an inert gas shield and a short arc is disclosed. Material is dispensed by the melting electrode to the workpiece while an electronically controlled electrical short circuit is formed. An inert gas is used that consists of 50 to 5000 vpm (0.005 to 0.5 vol. %) of oxygen, carbon dioxide, nitrogen monoxide, nitrogen, dinitrogen monoxide, or of a mixture of these gases, in argon or in an argon/helium mixture.

Abstract: A method and apparatus for providing bubble-free liquid carbon dioxide to a user is disclosed. For cost-effective supply, gaseous CO2 is removed from a supply line, liquefied in a condenser and transported to the user.

Abstract: A method and apparatus for protective gas welding using at least two consumable electrodes to which at least two different potentials are applied is disclosed. A common weld pool is formed by one leading electrode and at least one trailing electrode. When two electrodes are used, this method is also referred to as tandem welding. A larger electrode diameter is used for the leading electrode in comparison with the trailing electrode. Furthermore, a protective gas mixture consisting of 3 to 40 volume % carbon dioxide and/or oxygen and argon and optionally helium is used.

Abstract: In a process for the production of a shielding gas mixture argon is withdrawn from a liquid argon supply, vaporized and mixed with a gas premix. The gas premix contains helium and/or argon and a doping gas. A shielding gas mixture prepared this way is outstandingly suited, especially because of the helium content, for arc welding of aluminum and aluminum alloys.

Abstract: A shielding gas for gas shielded metal-arc welding or brazing with multiple (in particular 2) wire electrodes, one common melting bath, and multiple power sources. Such shielding gases contain, for example, a small percentage of carbon dioxide or doping gas and possibly hydrogen, 10%–75% helium, with the remainder argon. The process is applicable to aluminum materials and low alloy or high alloy steels, for example.

Abstract: A method of gas-shielded metal arc joining using a consumable electrode having an alternating polarity (GMA-AC). A shielding gas containing helium is used to improve process stability and working speed.

Abstract: In a process for the production of a shielding gas mixture argon is withdrawn from a liquid argon supply, vaporized and mixed with a gas premix. The gas premix contains helium and/or argon and a doping gas. A shielding gas mixture prepared this way is outstandingly suited, especially because of the helium content, for arc welding of aluminum and aluminum alloys.

Abstract: Process for making heterogeneous joints under shielding gas In joining heterogeneous materials that differ in their melting points, a shielding gas mixture with active gas content is utilized. In particular, the shielding gas mixture contains helium and active gasses in the vpm range (0.005 to 0.5% by volume). These shielding gases to lead to the production of high quality joints when joining aluminum and steel.

Abstract: The invention relates to a shielding gas for gas shielded metal-arc welding or gas shielded metal-arc soldering with multiple (in particular 2) wire electrodes. According to the invention, it contains helium.

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.