摘要:
The invention relates to a laser beam welding method for carbon steels applied to laser beam welding of carbon steels of different carbon content, and in order to improve uniformity of fused metal in the welded region, a laser beam is applied obliquely to the joint region between the carbon steels from the side of the carbon steel having the lower carbon content. When manufacturing a vehicle wheel 1 by this method, the laser beam is applied obliquely from the side of the hub 3 of rolled steel plate which contains about 0.1% of carbon to the joint region with the boss 2 of carbon steel for machine structural use which contains about 2% of carbon so as to fuse the end of the hub 3 and cause it to penetrate into the welded region.
摘要:
A bimetallic hull mount assembly (10) for reducing galvanic corrosion of a hull (12), including a foundation (14), made of a first material, welded to the hull (12), also made of the first material; and an insert (16), made of a second material, different from the first material, welded to the foundation (14); wherein a weld area (15) between the insert (16) and the foundation (14) is covered with paint (19), and where the insert (16) is welded to the foundation (14) in a controlled welding manufacturing environment, utilizing high performance dissimilar welding techniques to produce a dissimilar metal weld and the foundation (14) is welded to the hull (12) with a standard shipyard weld.
摘要:
A method of braze joining a copper member to a substrate of metal or ceramic material is disclosed according to which a diffusion barrier coating as defined is applied to the substrate alone, and a selected brazing alloy is interposed between copper member and substrate, followed by a two-step heating treatment. In the first step the assembly is heated at a temperature and for a time sufficient to melt the brazing alloy and cause a bond to form between the brazing alloy and the copper member and between the brazing alloy and the substrate. In the second step the temperature is raised and maintained in the range from about 600.degree. C. to about 950.degree. C. in a "solutionizing heat treatment" (as defined) for a time sufficient to allow the brazing alloy to form an "extended solid solution" (as defined) with copper in a controlled fashion to convert the bond to a strong joint which is resistant to thermal stress.
摘要:
The present invention relates to a method of efficiently manufacturing a spotwise partial clad material, which is used for a lead frame of a semiconductor integrated circuit such as a flat package. According to the method, a substrate material to which metal foil pieces having a determined size have been tacked at a highly accurate pitch is prepared by continuously pre-tacking a metal foil as fed at a constant feeding rate to a substrate material as fed also at a constant feeding rate at determined intervals by spot-welding by any of resistance welding, ultrasonic welding or laser welding or thereafter cutting and removing the unnecessary parts by laser-cutting or by the use of rotary cutters, or alternatively, it is prepared by cutting a metal foil as fed at a constant feeding rate with a punch with simultaneously tacking the resulting metal foil piece to a substrate material as fed also at a constant feeding rate by spot-welding of using the punch as an electroconductive material part. The obtained metal-tacked substrate material is pressure-welded and rolled, whereupon the intended and determined thickness of the rolled material is ensured by cascade control for load-constant control and elongation percentage-constant control and the intended load in rolling is controlled by detecting the intended position from the pitch of the rolled material and the intended standard point of the non-rolled material.
摘要:
In this method for padding, a layer of a copper type alloy material in powdered form is laid upon a portion of a base of aluminum type metal which is to be padded. Then a laser beam, concentrated to a spot from about 0.5 mm to about 2.0 mm in diameter with an output density of from about 80 watt/mm.sup.2 to about 20,000 watt/mm.sup.2, is irradiated upon this layer of powdered copper type alloy material upon the base of aluminum type metal. The laser beam and the base of aluminum type metal are relatively moved in a relative longitudinal direction at a longitudinal speed of from about 100 mm per minute to about 3000 mm per minute; and they are also reciprocatingly moved in a relative direction substantially transverse to the longitudinal direction at an transverse oscillating frequency of above about 80 Hz. Thereby, good padding efficiency is obtained. The copper type alloy material may initially be applied as a powder including a binder and then be dried, before the laser irradiation; or it may be applied automatically substantially during the laser irradiation.
摘要:
A bearing structure having a substrate and a bearing surface of alternating, spaced, hard metal and soft metal areas is disclosed. The hard metal is metallurgically bonded to the base metal substrate by rapidly melting in a predetermined pattern a powdered hardfacing composition disposed on a bearing precursor surface of the base metal substrate. The melting is accomplished by scanning with a laser beam, or like high intensity, concentrated energy source. The melt is allowed to solidify rapidly. Gaps formed between isolated areas of the solidified hard metal are filled with a melt of a soft metal. After solidification of the molten soft metal, the resulting composite structure is machined to a desired depth to provide the composite bearing surface.
摘要:
Copper and aluminum conductors are butt welded or corner welded by a two-part process involving heating and melting the Cu-Al interface with energy from a pulse laser and simultaneously generating a contact pressure. The laser wavelength is 1.06 micrometers or less and a single 8 millisecond pulse is used. Brittle intermetallics are found in the flash but the narrow fusion zone in the weld is substantially free of intermetallics. High conductivity aluminum is successfully welded to electrolytic tough pitch (ETP) copper wire.
摘要:
The tangling of hellically-coiled wire articles during bulk handling and shipment is prevented by providing integral modules or beads of fused metal at each end of the articles which enclose the severed ends of the wire. In the case of tungsten wire coils that are designed for use in electric lamps and similar devices and are wound on iron mandrels, the fused beads are composed of tungsten-iron alloy and formed in situ during coil manufacture by melting the ends of the mandrel with a concentrated heat source such as a focused laser beam. The tungsten-iron alloy beads remain on the end turns of the coil during the subsequent mandrel-dissolving operation, are ductile and are formed without embrittling the tungsten wire. Various methods and an apparatus for manufacturing such beadedend coils on a mass production basis using a CO2 laser are disclosed. Since the beads can readily be made larger than the diameter of the coil and be spaced a predetermined distance apart, they provide built-in guides or ''''reference points'''' for mounting incandescent lamp type filament coils on their lead wires and thus accurately controlling the lighted-length of the mounted coils.
摘要:
A method of refurbishing turbine engine vanes in which an alloy blend of a cobalt based superalloy and a nickel based superalloy corresponding to the base material of the turbine vane cobalt platform and the base nickel material of the replacement turbine vane airfoils is laser clad to the gaspath surfaces of the turbine vane platform. Laser cladding with the alloy blend allows the use of replacement airfoils with improved castings in the form of improved nickel based superalloys, and allows a coating to be uniformly applied to the gaspath surfaces of the vane. According to the method, the platforms are separated from the airfoils and laser clad with a blend of cobalt based superalloy and nickel based superalloy. The vane is then reassembled using the laser clad platform and at least one replacement airfoil.
摘要:
A method and apparatus are provided for hardsurface cladding a workpiece such as a tip shroud notch face of a turbine bucket configured for contact engagement with an adjacent tip shroud notch face. A continuous wave laser beam is generated in a Nd:YAG laser and directed on the notch face at a spot to provide heat thereat. A hardsurface cladding wire is dispensed at the spot under a shielding gas for being melted by the laser beam to form a molten cladding layer on the notch face. The laser beam and wire are traversed over the notch face to form a cladding layer over the entire notch face, which is cooled and solidified in a hardsurface cladding layer integrally bonded to the notch face.