Abstract:
A first contact surface (310) of a semiconductor laser chip (302) can be formed to a first target surface roughness and a second contact surface (312) of a carrier mounting (304) can be formed to a second target surface roughness. A first bond preparation layer (306) comprising a first metal can optionally be applied to the formed first contact surface, and a second bond preparation layer (308) comprising a second metal can optionally be applied to the formed second contact surface. Both preparation layers may be made of gold and diffusion bonding results from a heating of device under pressure. The first contact surface can be contacted with the second contact surface, and a solderless securing process can secure the semiconductor laser chip to the carrier mounting. Related systems, methods, articles of manufacture, and the like are also described.
Abstract:
A system and method for joining curved surfaces such as pipes by obtaining pipes having additional rough stock material on the pipe ends, the rough stock material being precision machine processed to prepare complementary face profiles on each of the curved surfaces and then performing friction stir joining of the pipes to obtain a joint that has fewer defects than joints created from conventional welding.
Abstract:
The invention relates to a method for producing a permanently joined plate heat exchanger (1) comprising a plurality of metal heat exchanger plates (2) having a solidus temperature above 1100 ºC, provided beside each other and forming a plate package (3) with first plate interspaces (4) for a first medium and second plate interspaces (5) for a second medium, wherein the first and second plate interspaces (4, 5) are provided in an alternating order in the plate package (3). Each heat exchanger plate (2) comprises a heat transfer area (10) and an edge area (11) which extend around the heat transfer area (10). The heat transfer area (10) comprises a corrugation of elevations (18) and depressions (19), wherein said corrugation of the plates are provided by pressing the plates. The invention also relates to a plate heat exchanger (1) produced by the method.
Abstract:
The invention relates to a method for producing a permanently joined plate heat exchanger (1) comprising a plurality of metal heat exchanger plates (2) having a solidus temperature above 1100 ºC, provided beside each other and forming a plate package (3) with first plate interspaces (4) for a first medium and second plate interspaces (5) for a second medium, wherein the first and second plate interspaces (4,5) are provided in an alternating order in the plate package (3), wherein each heat exchanger plate (2) comprises a heat transfer area (10) and an edge area (11) comprising bent edges(15) which extend around the heat transfer area (10), wherein a first surface (16) of the plates (2) forms a convex shape and a second surface (17) of the plates forms a concave shape wherein the heat transfer area (10) comprises a corrugation of elevations (18) and depressions (19), wherein said corrugation of the plates and the bent edges (15) are provided by pressing the plates. The invention also relates to a plate heat exchanger (1) produced by the method.
Abstract:
A method for joining a first metal part (11) with a second metal part (12), the metal parts (11,12) having a solidus temperature above 1100 QC. The method comprises: applying a melting depressant composition (14) on a surface (15) of the first metal part (11), the melting depressant composition (14) comprising a melting depressant component that comprises at least 25 wt% boron and silicon for decreasing a melting temperature of the first metal part (11 ); bringing (202) the second metal part (12) into contact with the melting depressant composition (14) at a contact point (16) on said surface (15); heating the first and second metal parts (11,12) to a temperature above 1 100 QC; and allowing a melted metal layer (210) of the first metal component (11) to solidify, such that a joint (25) is obtained at the contact point (16). The melting depressant composition and related products are also described.
Abstract:
Methods for bonding a porous tantalum structure to a substrate are provided. The method includes placing a compressible or porous interlayer between a porous tantalum structure and a cobalt or cobalt-chromium substrate to form an assembly. The interlayer comprising a metal or metal alloy that has solid state solubility with both the substrate and the porous tantalum structure. Heat and pressure are applied to the assembly to achieve solid state diffusion between the substrate and the interlayer and the between the porous tantalum structure and the interlayer.
Abstract:
An apparatus of spot welding comprises a clamp structure having a hollow bottom arm (3) and a hollow upper arm (5), arranged in a tip to tip fashion, that a gap exists in between the opposing arms (3 and 5) for positioning of at least two layers of lapping metallic work pieces (1 and 2) and at least one of the opposing arms is moveable towards or away in relative to another for clamping or releasing the lapping metallic work pieces (1 and 2); a bottom conducting shaft (4) and upper conducting shaft (6) housed within the bottom arm (3) and the upper arm (5) respectively with the upper conducting shaft (6) capable of performing axial translational and/or rotational motions at its elongated central axis; and a controlling means (24) regulating the clamp structure and the opposing conducting shaft (4 and 6) as well as providing a user interface for management of the apparatus; wherein one of the tips of each opposing conducting shaft (4 and 6) contacting weld area (14) of the lapping metallic work pieces (1 and 2) under a predetermined pressure to conduct an electrical current thereto generating heat to soften the weld area of the metallic work pieces (1 and 2) without melting the metallic work pieces (1 and 2), and the upper conducting shaft (6) starts axial rotation to thrust into the weld area of the metallic work pieces (1 and 2) upon detecting of softening in the weld area; characterized in that a displacement sensor (12), in communication with the controlling means (24), is used in conjunction with the conducting shafts (4 and 6) to detect slight axial movement of at least one conducting shaft towards the weld area to determine softening of the weld area and initiates the upper conducting shaft (6) to rotate.