Abstract:
A method for welding galvanized material including a low vapor pressure mild steel core and a high vapor pressure rich zinc coating includes the steps of arranging components of such galvanized material in juxtaposed relationship at a lapped joint; and applying a high density laser energy beam along the lapped joint as a weave pattern in which the weave pattern has a width great enough to bridge the lapped joint and a weave pattern frequency which forms a predetermined weld pool between the components and wherein the lapped joint and weave pattern combine to define a vapor pressure relief path so that the weld pool will not be disrupted during the application of the high density laser energy beam to the galvanized components.
Abstract:
A magnetic scale includes a magnetic base member and a thin film formed on a surface of the magnetic member by plating or flame spraying nickle, chromium, manganese, silicon, boron, carbon, or a combination thereof. A laser beam or an arc discharge is applied to the outer circumferential surface of the thin film to fuse the metal of thin film and the metal of the base member under heat for thereby forming nonmagnetic modified portions on the surface of the base member.
Abstract:
A method for fabricating graded refractive index (rugate, optical filters as well as complex rugate filters having prespecified refractive index verses thickness profiles is disclosed. A plurality of at least two different compatable thin film deposition source components of different refractive index, which are stoichiometrically combinable in variable proportion, such as silicon nitride and silicon oxide, or zinc sulfide and zinc selenide, are used to form a thin film material with a refractive index which varies as a function of the proportions of the components. Each source component is separately laser flash evaporated and codeposited on a substrate to form a coating while monitoring the physical and optical thicknesses of the coating, to allow adjustment of the respective laser flash evaporation rates of the source components.
Abstract:
There is here provided butt-welded cans made of steel plates having a carbon concentration of 0.02 to 0.09% by weight, the aforesaid butt-welded cans being characterized in that a coating film for preventing the adhesion of melted metal particles is applied to at least the inner surface of the weld portion and its vicinity of each can, and a carbon concentration index I of the weld portion satisfies the formula (1)I=(Iw/Ic).times.10.sup.3 .ltoreq.15 (1)wherein Iw is a K.alpha. X ray intensity, of carbon in the weld portion, measured by the EPMA method, andIc is a K.alpha. X ray intensity, of carbon in graphite, measured by the EPMA method.
Abstract:
A method for producing a hole in a polymer film includes the steps of depositing a conductive layer onto the polymer film and irradiating a spot on the layer with a burst of focused laser energy at a level sufficient to form an opening in the film and, subsequently, plasma etching the film so as to form a hole of desired depth in the polymer film underlying the opening in the conductive layer. This method is particularly applicable to the formation of multichip intergrated circuit packages in which a plurality of chips formed in a semiconductor wafer are coated with a polymer film covering the chips and the substrates. The holes are provided for the purpose of interconnecting selected chip contact pads via a deposited conductive layer which overlies the film and fills the holes.
Abstract:
A coated substrate manufactured by applying a layer of a material to the substrate and generating thermal and pressure waves in the layer by exposing the layer to high intensity, short duration laser radiation, and the process of manufacturing such a coated substrate. The laser radiation is applied in an intensity range that creates an instantaneous surface vaporization of the layer material that in turn drives a pressure wave into the layer. The pressure wave interacts with the layer-substrate interface to create bonding between them of varying strengths and qualities depending on the intensity and duration of the initial laser pulse. A thermal wave is created in some regimes of operation, or results from compressional heating of the layer by the pressure wave, and is of sufficient energy to contribute to the bonding at the interface. The coating and the process for its creation has application in diverse areas where surface properties of a particular color, hardness, corrosion resistance, abrasion resistance, electrical conductivity, among others are desired.
Abstract:
An improved method is disclosed for producing a welded joint between galvanized steel sheet members utilizing a laser beam or the like. Surface regions of the galvanized member in the weld zone are selectively pretreated to remove the zinc coating and apply a nickel-base coating. The nickel coating avoids the vaporization problems associated with zinc, while providing suitable corrosion protection in the welded joint.
Abstract:
Process for smoothing the eye of a needle during maufacture using high power density radiation from a laser to melt the surfaces of the eye area and subsequently permitting the melted surfaces to solidify giving smoother surfacing.
Abstract:
A method of welding high reflectivity materials by laser radiation comprising cladding material in the area to be welded with a low reflectivity material and subsequently directing a coherent beam of laser radiation, pulsed or continuous, onto the clad material to form in the weld area a molten alloy of the two materials which, when cooled, forms a weld nugget which is integrally bonded with the high reflectivity material.
Abstract:
A method of welding galvanized steel with a high energy density beam is disclosed. The high energy density can be created by an electron or laser beam with a power density of at least 4.times.10.sup.6 watts per square inch. A flux material, such as iron oxide, is disposed adjacent the welding zone, preferably by painting thereon, which is effective to form a compound with the zinc of the galvanized steel upon heating. The compound has a vapor pressure substantially the same or lower than the vapor pressure of the steel substrate so that disruption of the weld puddle is prevented to insure that all of the weld puddle will be available to properly close the weld void.