Patent application number | Description | Published |
20080296269 | TIG WELDING EQUIPMENT AND TIG WELDING METHODS - The TIG welding methods of the present invention include generating an electric arc between an electrode and an object to weld the object, wherein a first shielding gas including an inert gas flows toward the welded object surrounding the electrode, a second shielding gas containing an oxidative gas flows toward the welded object along a periphery of the first shielding gas, and the concentration of the oxidative gas in the second shielding gas is set such that the oxygen concentration in the welded metal portion of the welded object is within a range of 70 to 220 wt. ppm. | 12-04-2008 |
20090056404 | TRANSFORMABLE METAL SURFACE HARDENING METHOD - A method of metal surface hardening treatment inducing transformation, in which transformation is induced in a surface interior of material as hardening treatment object by simple, rapid treatment utilizing a frictional heat under pressure without the occurrence of melt loss, quench crack, soft spot, deformation, etc. to thereby reform the structure of surface interior of material as hardening treatment object into a miniaturized martensitic structure. The method of surface hardening treatment comprised the steps of while rotating nearly cylindrical pressurization tool ( | 03-05-2009 |
20090068492 | PROCESS FOR WORKING METAL MATERIAL AND STRUCTURES - In a first step, friction stir welding is performed, while supplying a filler into a joining portion, in order to prevent the coarsening of crystal grains of metal materials in a subsequent fusion processing. Then, a fusion processing such as MIG welding is performed. The filler to be added to the joining portion includes a substance that does not chemically react with the metal materials and has a melting point higher than a melting point of the metal materials and a substance in which a misfit with the metal materials is within ±15%. As a result, the coarsening of crystal grains by the fusion processing is inhibited and the joint strength can be increased. | 03-12-2009 |
20090090700 | JOINING METHOD - A joining method of the present invention includes conducting friction-stir-welding of members to be joined, to form a joint; and then conducting melt-welding or resistance-welding of the joint, wherein the friction-stir-welding of members to be joined is conducted while flowing an inert shielding gas, or the melt-welding or resistance-welding of the joint is conducted while applying an ultrasonic wave. | 04-09-2009 |
20090166395 | METHOD OF JOINING METAL MATERIAL - Metal materials made of iron (Fe) or the like are butted together at a joint, and a probe of a rotary tool is inserted into the joint. The rotary tool is rotated while being moved in the lengthwise direction of the joint, whereby the metallographic structure of the joint is stirred, and the metal materials are joined. While the rotary tool is being rotated and moved, liquid CO | 07-02-2009 |
20100178526 | PROCESS FOR WORKING METAL MEMBERS AND STRUCTURES - Carbon steel materials having a carbon content of at least 0.15 mass % are caused to abut against each other in a welding part. The rear face side of the welding part is covered by a stainless-steel backing member, and then a tubular probe of a rotary tool is inserted into the front face side of the welding part to weld the metallic materials together. To perform the welding, the maximum attained temperature of the welding part is controlled so as not to exceed 723° C. or 737° C., or the cooling rate of the welding part is controlled to 75° C./s or lower. In this manner, the formation of a martensite phase in the metallic structure of the welding part can be prevented and hard-carbon steel can be welded together at a high intensity. | 07-15-2010 |
20100252614 | METHOD FOR WELDING METAL MATERIAL - Metallic materials having a melting point of at least 2000° C. are caused to abut against each other in a welding part. The rear face side of the welding part is covered by a backing member having a thermal conductivity of 30 W/mK or lower, and then a columnar probe of a rotary tool comprising an Ir alloy is inserted into the front face side of the welding part to weld the metallic materials together. On the front face side of the welding part, inactive gas is supplied into a shield cover. The rotary tool is moved along a longitudinal direction of the welding part while rotating the rotary tool, whereby the metallic materials are welded together. By using the rotary tool comprising an Ir alloy, the refractory metals can be welded to each other by means of friction stir welding. | 10-07-2010 |
20110274943 | METAL MATERIAL PROCESSING METHOD, STRUCTURE PROCESSED USING METAL MATERIAL PROCESSING METHOD AND ROTARY TOOL - In a metal material processing method, two metal materials are arranged to face each other in a processing portion, and a distal end of a rod-shaped rotary tool is inserted into the processing portion while rotating the rotary tool, thereby the two metal materials are processed. The distal end of the rotary tool has a probe protruding in a central portion and a shoulder in a peripheral portion. The probe and the shoulder are constituted by different materials in at least surface portions that are in contact with the metal materials. | 11-10-2011 |
20120186160 | METHOD FOR MODIFICATION OF CEMENTED CARBIDES AND CEMENTED CARBIDES MODIFIED BY THE METHOD - Provided are a method of modifying a cemented carbide and a cemented carbide modified by the method. Particularly provided is an advantageous method of modifying a cemented carbide layer formed by a thermal spraying method on a surface of a metal substrate. The method of modifying a cemented carbide includes applying a friction stir process to a cemented carbide, thereby allowing crystal grains in a binder phase included in the cemented carbide to become finer. It is possible to achieve modification effectively by applying the friction stir process particularly to a cemented carbide layer formed on a surface of a metal substrate by using the thermal spraying method. | 07-26-2012 |
20120237788 | METAL MATERIAL PROCESSING METHOD, STRUCTURE PROCESSED USING METAL MATERIAL PROCESSING METHOD AND ROTARY TOOL - A metal material processing method includes arranging two metal materials to face each other in a processing portion and inserting a distal end of a rod-shaped rotary tool into the processing portion while rotating the rotary tool, the two metal materials are processed. The distal end of the rotary tool has a probe protruding in a central portion and a shoulder in a peripheral portion, and the probe and the shoulder are constituted by different materials in at least surface portions that are in contact with the metal materials. | 09-20-2012 |
20130068735 | METHOD FOR FORMING METAL MEMBRANE - The present invention provides a method of forming a metal coating having a microstructure as well as a structural member having a metal coating formed by the method. In particular, the invention provides an advantageous method of forming a metal coating in which minute carbides are uniformly dispersed. The method of forming the metal coating of the present invention includes the steps of cladding a surface of the substrate with metal powder by a laser cladding method and forming the metal coating having a microstructure by applying a friction stir processing to the cladded region. | 03-21-2013 |