1756 results about "Heat-affected zone" patented technology

Spinal stabilization devices, systems and methods are provided that include a spring junction wherein a structural member is mountable to a spine attachment fastener and a resilient element is affixed to the structural member along an attachment region of the resilient element. The attachment region is disposed physically separately with respect to an active region of the resilient element. The attachment region can include a weld region produced via an E-beam welding process involving temperatures of 1000° F. or greater, wherein a heat-affected zone adjacent the weld region is disposed physically separately with respect to the active region. The resilient element may be a coil spring including bend regions adjacent its outermost (i.e., last) coils wherein the material of the coil spring initially bends away from the last coil, then bends back toward the last coil before terminating near the last coil.

The amount of melting of the bonding wire is closely regulated, and reduction of size and improvement of uniformity of the free air ball is obtained for ball bonding at pitches of less than ninety mils even when bonding wire of reduced diameter is employed. Quenching of the bonding wire adjacent to the free air ball also limits the temperature rise in the bonding wire and the extent of a heat affected zone having less tensile strength and stiffness to less than one micron and with reduced grain enlargement. The present invention provides such a bond for electronic packaging of increased reliability, potential functionality, increased manufacturing yield and reduced process complexity.

Various embodiments may be used for laser-based modification of target material of a workpiece while advantageously achieving improvements in processing throughput and/or quality. Embodiments of a method of processing may include focusing and directing laser pulses to a region of the workpiece at a pulse width sufficiently short so that material is efficiently removed by nonlinear optical absorption from the region and a quantity of heat affected zone and thermal stress on the material within the region, proximate to the region, or both is reduced relative to a quantity obtainable using a laser with longer pulses. In at least one embodiment, an ultrashort pulse laser system may include at least one of a fiber amplifier or fiber laser. Various embodiments are suitable for at least one of dicing, cutting, scribing, and forming features on or within a composite material.

A cage and sleeve assembly for an embolic filtering device used to filter embolic particles from a body vessel has a strut assembly that is movable between an unexpanded position and an expanded position. Struts having strut ends at the respective ends form a cage. The strut ends are initially made from linear elastic nitinol, and a series of spot or laser or other types of welds then secure the strut ends in the sleeve assembly. In one approach, the ends of the strut ends are welded to form a tube. In another approach, the strut ends are welded onto a sleeve. The strut ends may optionally have ends that are partial cylinders, and the partial cylinders are welded onto a cylindrical sleeve. Effects from the welding, such as changing linear elastic nitinol to superelastic nitinol, are contained within a heat-effected zone, and do not extend into areas of the structure that typically bend during use.

A method of rough shaping a prosthetic joint component that includes a generally spherical polycrystalline diamond compact by electric discharge machining is disclosed. The discharge machining electrode roughens a polycrystalline diamond compact sphere while the electrode and the sphere are rotating about different axes. By controlling the amount of discharge current, the depth and amount of the heat affected zone can be minimized. In the case of a polycrystalline diamond compact, the heat affected zone can be kept to about 3 to 5 microns in depth and is easily removable by grinding and polishing.

In connection with thermal recovery projects, a system determines temperature gradients for a heat affected zone associated with a subterranean hydrocarbon reservoir. An exemplary system includes a plurality of temperature sensors distributed in the wellbore at least partially along the heat affected zone. A downhole processor positioned proximate and substantially outside of the heat affected zone receives and digitizes the temperature measurements. A data link such as a data cable coupled to the downhole processor conveys the temperature measurements to a surface interface.

The invention belongs to the field of material surface engineering and more particularly relates to a method for carrying out cladding on a high-hardness wear-resistant anti-corrosion nickel-based alloy material on a metal substrate E in a large area by applying a laser cladding technology, solving the problem of cracks generated in the laser cladding process of the high-hardness wear-resistant nickel-based alloy, in particular the cladding defects, such as cracks with the thickness of more than 1mm, pores and the like during large-area cladding. According to the invention, the high-hardness nickel-based alloy powder material is cladded on the surface of the metal substrate in the large area to form a high-hardness wear-resistant anti-corrosion nickel-based alloy coating by applying the laser cladding technology and adopting a scientific and reasonable process method. According to the method disclosed by the invention, stability and consistency of laser cladding are foundationally ensured, defects, such as cracks, pores, impurities can be prevented from generating, heat affected regions of the substrate are reduced, dilution rate is reduced, the high-wear-resistance anticorrosion nickel-based alloy coating with firm metallurgical bonding and fine and compact grains is obtained and has the hardness reaching 58-63HRC, and the service life of the processed workpiece can be prolonged by more than 1-2 times.

The invention provides a high strength low alloy steel plate suitable for high heat input welding and is characterized in that the chemical composition (wt percent) of steel comprises 0.04 percent to 0.16 percent of C, 0.10 percent to 0.50 percent of Si, 0.40 percent to 1.8 percent of Mn, 0.020 percent to 0.050 percent of Nb, 0.006 percent to 0.030 percent of Ti, 0.0030 percent to 0.010 percent of N, 0.015 percent to 0.060 percent of Al and the rest, Fe and other inevitable impurities; meanwhile, C+Mn/6+Si/24+Ni/40+Cr/5+Mo/4+V/14 is less than or equal to 0.45 percent and the total amount of Ti and the total amount of N are that [Ti percent]T is more than or equal to 2.667[N percent]T-0.004667 percent; moreover, Ti microalloying is adopted to ensure that the Ti/N ratio in the second sort of particle generated ranges between 2.4 and 3.2. The manufacture method of the steel plate adopts austenite recrystallization zone and austenite non-recrystallization zone rolling and forced water cooling after rolling; moreover, when the steel plate is under 50 KJ/cm to 150 KJ/cm high heat input welding, the welding heat affected zone has excellent toughness. The invention has the advantages of simple production process, low cost and wide applicability.

A method of forming a score line in a rupture disc using a laser is provided, wherein the method includes selecting a wavelength for the laser that maximizes absorption of the laser radiation by the disc material, selecting a pulse duration for the laser that maximizes a peak power of the laser, selecting a pulse repetition rate for the laser that reduces a heat affected zone of the rupture disc during ablation, and selecting the speed of relative motion between the laser and the rupture disc. The score line is ablated in the rupture disc using the laser to remove material from the rupture disc as vapor without melting or oxidizing disc material adjacent the material being removed.

The invention provides a laser cladding method which comprises the steps of: blanking, preparing cladding material according to a workpiece to be cladded; and laser cladding, melting parent material by laser, fusing the cladding material and the melted parent material onto the parent material and forming a cladding layer. According to the laser cladding method, the cladding layer is bonded with the parent material in a metallurgical bonding way; and the cladding speed is rapid, the heat affected zone is small, and the quality of the cladding layer is more easily controlled, so that quality defect such as a brittle point or a crack is not easily caused, and the bonding force between the cladding layer and the parent material is strong.

The invention discloses a simulation method of texture evolvement of a heat affected zone in a welding process, relating to a fine texture simulation method of a welding connector and aiming at solving the problems that the quantification of the present fine texture evolvement of a weld joint is mainly based on an experiential or half experiential deterministic model or analysis calculation, and only the texture content is calculated but the state, the size and the distribution of the texture cannot be reflected dynamically. The method comprises the following steps: step 1, calculating the temperature fields of the heat affected zone; step 2, calculating the crystalline grain growth process of crystalline grains at different positions above a beta phase zone according to the distribution of the temperature fields; and step 3, calculating continuous cooling solid state phase change according to the cooling velocity and the beta phase crystalline grain distribution calculation result obtained through the temperature field calculation. The simulation method is used for the fine texture simulation of the welding connector.

A differential diameter hole drilling method by which through-holes having improved major surface quality are formed in a target material involves drilling a pilot hole having a diameter that is less than the desired diameter of the through-hole and then drilling a through-hole having the desired diameter. The pilot hole forms a channel from which thermal energy produced during laser drilling can diffuse into the environment, thereby reducing the amount of thermal energy diffusing into the surrounding target material matrix and the degree of thermal damage to the heat affected zone of the target material matrix. The pilot hole also forms a channel through which ablated target material may be removed, thereby increasing overall through-hole throughput. Pilot hole formation reduces the thermal energy required to form the remaining portion of the through-hole and thereby results in less thermal damage to the surrounding target material matrix.

The invention discloses a method for prolonging life of pump shells and blades by carrying out laser strengthening, which relates to the technical fields of machinery manufacturing and laser processing application. The method adequately combines the characteristics of laser cladding with laser shock strengthening, i.e., the method comprises the steps of performing laser cladding repair on micro-cracks at first, and then performing laser shock strengthening treatment on a cladding layer, thus effectively solving the problem that the pump shells and blades are easy to generate internal defects such as cracks and air holes in the laser cladding repair process, and avoiding the problems of welding deformation, large heat influence area, easy generation of heat cracks and the like in a conventional processing method; the method disclosed by the invention is capable of generating a high-amplitude residual compressive stress on the surface of a material, effectively improving the fretting fatigue resistance of the material, comprehensively improving the mechanical properties of the material, and greatly prolonging the fatigue life of the material, thus achieving the purposes of prolonging the life and improving the reliability and safety.

The method and apparatus for performing the method of forming a weld joint of the present invention utilizes welding apparatus (100) having welded tool (102) and a compression tool (106) for inducing a layer of residual compressive stress along the surface of the weld line (18) and any heat affected regions with a controlled amount of cold working and surface hardening. In a preferred embodiment of the invention the compression tool (106) utilizes a single-point burnishing process to provide deep compression within the weld joint (20) with a minimal amount of cold working and surface hardening.

The invention relates to an electric resistance welding method for a variable-thickness ultra-high strength hot formed steel plate and a low-carbon steel plate. The method is characterized in that the low-carbon steel plate and the ultra-high strength hot formed steel plate are lapped on electric resistance welding machines with different upper and lower electrode end face areas, and are welded by means of preheating and double pulsing. Compared with the prior art, the method has the advantages that the defect of the influence of splash, nugget deviation and the like on welding spot quality in spot welding of variable-thickness dissimilar steel can be avoided, the influence of softening of a heat-affected zone of the ultra-high strength hot formed steel plate on joint quality is decreased, welding quality of electric resistance spot-welded joints of the variable-thickness ultra-high strength hot formed steel plate and the low-carbon steel plate is remarkably improved, and the like.

The invention discloses a copper alloy laser-cold metal transition compound heat source material increase manufacturing method. The method comprises the steps that laser and a cold metal transition arc are adopted as a compound heat source, copper alloy welding wires are molten for bead welding, and copper alloy products are formed by stacking bead welding layers one by one. According to the copper alloy laser-cold metal transition compound heat source material increase manufacturing method, due to the effective coupling of the laser and the CMT electric arc, the problem that mucous threads, top threads and layers are not completely fused during laser material increase manufacturing in a copper alloy wire feeding mode is solved, meanwhile, the defects that the heat source moving speed is low and the heat affected zone is wide during TIG arc material increase manufacturing are overcome, the compound heat source is high in moving speed, the welding process is stable, forming is good, the quality is high, the machining efficiency is remarkably improved, and the technological reliability is improved; in addition, due to the fact that the laser is not used for melting welding wires and the laser absorptivity of copper alloy is improved when the arc is preheated, the requirement of the technology for the laser power is lowered.

A friction stir welding (FSW) travel axis load control method and apparatus for controlling a travel axis load applied to a FSW setup during the joining of workpieces by FSW. The method and apparatus recognize that controlling certain attributes of a friction stir welding plasticized region are key to controlling the quality of the resulting weld. This invention controls any of a number of qualities associated with the plasticized region thereby producing welds having improved mechanical and aesthetic properties, as well as extending the life of the FSW tool. The method and apparatus may control the FSW process to obtain a predetermined optimum size of a heat affected zone. The plasticized region may be monitored in a number of ways including, but not limited to, force on the tool, torque applied to the tool, workpiece temperature, plasticized region physical dimension, as well as changing surface characteristics such as color and reflectivity.