The present invention provides a plasma enhancement method and apparatus for electric arc vapor deposition. The plasma enhancement apparatus is positioned to act upon plasma generated from a plasma source before the plasma reaches a substrate to be coated by the plasma. The plasma enhancement apparatus includes a magnet disposed about a magnet axis and defining a first aperture, and a core member disposed about a core member axis and at least partially nested within the first aperture. The core member defines a second aperture, and the plasma enhancement apparatus is arranged and configured in such a manner that the evaporated cathode source material passes from the cathode source and through the second aperture toward the substrate to be coated by the evaporated cathode source material. The plasma is favorably conditioned as it passes through the plasma enhancement apparatus.

Plasma enhancement apparatus and method for physical vapor deposition

A gas-metal-arc welding method is provided for high speed, high melting rate, substantially spatter-free, all-position welding. The method is particularly useful for out-of-position welding, that is, to produce vertical, inclined and overhead welds. A consumable wire electrode is held within and fed through the tubular contact tip of a continuous feed type welding gun having a tubular nozzle surrounding and extending beyond the tip. A shielding gas, formed of unique ratios of a minor proportion of a carbon dioxide and oxygen mixture combined with a major proportion of an argon and helium mixture, is flowed in a substantially longitudinally laminar pattern between the nozzle and contact tip and along the electrode extension from the tip. The contact tip is cooled, and sufficiently high power electrical current is passed through the contact tip and electrode extension to produce the arc and to melt the end of the electrode into molten drops for short-circuiting (e.g., low current) or for spray (e.g., higher current) transfer of the drops to the weld deposit. The electrode extension is pre-heated by maintaining a long electrode extension or stick-out beyond the contact tip end, with a substantial portion of the extension recessed within the nozzle.

Gas metal arc welding method

The invention relates to a method for controlling and/or adjusting a welding process, using a melting electrode, wherein after ignition of an electric arc, a welding process, which is adjusted on the basis of several different welding parameters, is carried out by means a welding current source (2), said process being controlled or adjusted by a control device (4). The invention also relates to a corresponding welding device used to carry out the process. In order to create said method, wherein the thermal heat economy is adjusted and/or regulated and/or controlled in order to introduce heat into the workpiece (16), at least two different process phases are cyclically combined, said process phases having different inputs of energy via different material transitions and/or arc types, such as a pulse current phase (27) and a cold metal transfer phase (28) in order to influence or control thermal heat economy, particularly the introduction of heat into the workpiece to be processed (16).

Method for controlling and/or adjusting a welding process and welding device for carrying out a welding process

The present invention relates to a method of providing a spray formed composite article. The method comprises providing a first article. The first article is a spray formed article. A second article is located adjacent the first article. Metallic particles are sprayed onto the articles and allowed to form a metal deposit that extends between and connects the first and second articles.

Method of spray joining articles

A welding gun adapted to secure a contact tip within the welding gun without threading the contact tip and without the use of tools. The contact tip may be adapted to abut a surface of a first member disposed within the welding gun. The surface may be a surface of a gas diffuser. The surface may be adapted to abut the contact tip. The contact tip also may be adapted for abutment with a second member to urge the contact tip toward the first member. The second member may be a portion of a nozzle adapted to abut the contact tip to urge the contact tip toward the surface of the first member. A method of assembling a welding gun also is provided. The method may comprise disposing a contact tip between a first and a second member and capturing the contact tip between the first and second members.

Welding gun having contact tip and method of operating same

of the Disclosure In a multiple electode gas shielded arc welding method wherein a plurality of electrodes are arranged along the welding seam line of a piece of metal to be welded and the continuous gas shielded arc welding of the piece is accomplished simultaneously by the electrodes, the chemical composition of a mixed shielding gas fed to the electrodes is selected in such a manner that the chemical composition of the shielding gas fed to the leading electrode or electrode group differs relative to that fed to the trailing electrode or electrode group to have a different active gas volume ratio and in this way the chemical composition of the weld metal layers formed by the preceeding and following welding operations are homogenizing to ensure uniformity of the properties at every positions in the weld zone.

Method of multiple electrode gas shielded arc welding

In longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the reverse-polarity GMA welding process comprising using direct electric current supplied to a consumable electrode through a cable as the welding current with said consumable electrode as the anode, the direction of said direct electric current for welding flowing through said cable introduced into said pipe-blank is set in the same direction as that of welding, thereby preventing occurrence of a magnetic arc blow of the welding arc from said consumable electrode toward the upstream side of the welding direction, ie, in the opposite direction to that of welding

Method for longitudinally seam-welding pipe-blank for welded steel pipe from the inside along a groove

of the Disclosure In a method of multiple electrode gas shielded arc welding wherein a plurality of electrodes are arranged along the welding seam line of a piece of metal to be welded and the continuous gas shielded arc welding of the piece is accomplished simultaneously by the electrodes, the chemical. composition of the electrode wire of the electrode or electrode group for depositing a proceeding layer or layers is selected to differ from that of the electrode wire of another electrode or electrode group for depositing a subsequent layer or layers, whereby the chemical composition of the weld metal made by the preceed-ing welding operation is brought near to that of the weld metal made by the following welding operation and thus the uniform properties are ensured for the welding metals at the respective positions in the weld zone.

Method of multiple gas shielded arc welding

Heavy current gas shielded arc welding method and torch therefor

After longitudinally seam-welding a pipe-blank for welded steel pipe from the inside along a groove by the arc welding process which comprises using direct electric current supplied to a consumable electrode through a cable as the welding current, the polarity of said consumable electrode applied for said longitudinal seam-welding is switched over to the opposite polarity, an arc from said consumable electrode is ignited again on a tab plate attached to the end of said pipe-blank on the completion side of said longitudinal seam-welding to cause a direct electric current for eliminating magnetism to flow through said cable in the opposite direction to that of said direct electric current for welding, thereby eliminating residual magnetism in said pipe-blank produced by said direct electric current for welding flowing through said cable introduced into said pipe-blank during said longitudinal seam-welding.

Jinkichi Tanaka

Papers

Method of multiple electrode gas shielded arc welding

Method for longitudinally seam-welding pipe-blank for welded steel pipe from the inside along a groove

Method of multiple gas shielded arc welding

Heavy current gas shielded arc welding method and torch therefor

Method for eliminating residual magnetism in pipe-blank for welded steel pipe longitudinally seam-welded from inside