37results about How to "Excellent welding characteristics" patented technology

The invention discloses a solder paste for a signal processing substrate and a preparation method thereof. The method comprises the following steps: 1) mixing Sn-Zn alloy, copper, indium, chloroauric acid hydrated, polyvinylpyrrolidone, a reducing agent and water to enable contact reaction so as to obtain an activating metal composition; 2) heating and dissolve rosin, rosin amine, organic acid, imidazole and tris(2-carboxyethyl) isocyanurate to obtain mixed liquor I; 3) mixing the mixed liquor I, a thixotropic agent and a preservative, and then cooling to obtain mixed liquor II; 4) mixing the mixed liquor II and polyethylene glycol to obtain a soldering flux; 5) refrigerating the soldering flux, and then performing dispersion mixing for the soldering flux and the activating metal composition under a vacuum condition and in the presence of X-rays, so as to obtain the solder paste for the signal processing substrate. The solder paste prepared by the preparation method is outstanding in chemical stability, low in welding temperature, and outstanding in expansion rate.

The invention discloses a light emitting diode and a manufacturing method thereof. In some embodiments, the light emitting diode comprises a transparent substrate having a first surface and a second surface opposite to each other, and a sidewall connecting the first surface and the second surface; a light-emitting table top which is formed on the first surface of the transparent substrate and comprises a light-emitting epitaxial laminated layer, wherein the light-emitting epitaxial laminated layer comprises a first conductive type semiconductor layer, an active layer and a second conductive type semiconductor layer which are stacked from the first surface of the transparent substrate; a supporting layer which is formed on the outer periphery of the light-emitting epitaxial laminated layer, wherein a plane is formed by the supporting layer and the light-emitting table top, and the cross sectional area of the plane is not smaller than that of the first surface of the transparent substrate; a first electrode disposed on the plane and electrically connected to the first conductive type semiconductor layer; and a second electrode disposed on the plane and electrically connected to the second conductive type semiconductor layer.

A polyamide resin composition for molded articles to be in contact with high-pressure hydrogen, the polyamide resin composition comprising a blend of a polyamide-6 resin (A) and a polyamide resin (B) which has a melting point, as determined by DSC, that is not higher than the temperature which is higher by 20oC than the melting point of the polyamide-6 resin (A) and which has a crystallization temperature during cooling, as determined by DSC, that is higher than the crystallization temperature during cooling of the polyamide-6 resin (A), the amount of the polyamide resin (B) being 0.01-5 parts by weight per 100 parts by weight of the polyamide-6 resin (A). The polyamide resin composition can give a molded article which, even when high-pressure hydrogen charging and pressure release are repeated, is inhibited from developing flaws and which has excellent weld properties.

The invention provides a piping for refrigeration, a production method and application. The piping for refrigeration is compounded from a plurality of metal layers, wherein the metal layers comprise a metal base layer, a side wall formed on the metal base layer and at least one copper cover layer used for being welded with an external part. The piping for refrigeration provided by the invention can totally replace the composite structure of a piping and a connecting piece of the conventional refrigeration device, so that the welding procedure is greatly decreased, and the welding cost is reduced.

The invention relates to a laser repairing method for allowing the roller surface of a hot roller to have good thermal hardness after repairing. A transitional alloy layer, an intermediate alloy layer and a surface alloy layer are arranged on the surface of the hot roller in a laser cladding mode from inside one by one. The alloy powder adopted by the transitional alloy layer comprises, by mass, 0.21%-0.31% of C, 3.2%-3.6% of Si, 1.0%-1.1% of B, 2.2%-2.6% of Fe, 7%-8% of Cr and the balance Ni. The alloy powder adopted by the intermediate alloy layer comprises, by mass, 0.4%-0.5% of C, 3.8%-4.3% of Si, 11.2%-11.93% of B, 2.5%-3.2% of Fe, 10%-12% of Cr and the balance Ni. The alloy powder adopted by the surface alloy layer comprises, by mass, 0.05%-0.1% of C, 3.2%-3.6% of Si, 2%-4% of Fe, 16%-19% of Cr, 27%-30% of Mo and the balance Co. The surface of the hot roller repaired by using the laser repairing method for the hot roller has good abrasion resistance, corrosion resistance and thermal hardness, toughness and strength are taken into account in the interior, and the effect of laser cladding is good.

The present invention provides a secondary battery including an electrode assembly comprising positive and negative electrodes with a separator interposed therebetween and wound together, a case, a cap assembly, and a negative current collecting plate. The negative current collecting plate includes a partially surface-treated region for fixing the negative current collecting plate to the negative electrode. The partially surface-treated region comprises a metal other than the metal of the negative current collecting plate. The use of a metal other than the metal of the negative current collecting plate provides an improved weld between the negative current collecting plate and the negative electrode which in turn provides improved battery performance, especially for high-load batteries.

The present invention relates to a low roller deformation hot roller laser repair method, wherein a transition alloy layer, an intermediate alloy layer and a surface alloy layer are sequentially subjected to laser cladding on the surface of a hot roller from the inner layer, the components of the alley powder used by the transition alloy layer comprise, by mass, 0.2-0.3% of C, 3.2-3.6% of Si, 1.2-1.8% of B, 2.2-2.6% of Fe, 7-8% of Cr and the balance of Ni, the components of the alley powder used by the intermediate alloy layer comprise, by mass, 0.4-0.5% of C, 3.8-4.3% of Si, 12-13% of B, 2.5-3.2% of Fe, 10-12% of Cr and the balance of Ni, and the components of the alley powder used by the surface alloy layer comprise, by mass, 0.05-0.1% of C, 3.0-3.16% of Si, 2-4% of Fe, 16-19% of Cr, 27-30% of Mo, and the balance of Co. According to the present invention, the hot roller repaired by using the hot roller laser repair method of the present invention has good abrasion resistance, good corrosion resistance and good thermal rigidity of the surface, has good toughness and good strength of the internal, and has good laser cladding effect.

The invention relates to a hot roller laser restoration method capable of prolonging the service lifetime of a hot roller. A transitional alloy layer, a middle alloy layer and a surface alloy layer are cladded with laser layer by layer from the inside on the surface of the hot roller. Alloy powder adopted by the transitional alloy layer includes components by mass: 0.12-0.19% of C, 3.2-3.6% of Si, 1.2-1.8% of B, 2.2-2.6% of Fe, and 7-8% of Cr, with the balance being Ni. Alloy powder adopted by the middle alloy layer includes components by mass: 0.4-0.5 % of C, 3.8-4.3% of Si, 12-13% of B, 2.5-3.2% of Fe, and 10-12% of Cr, with the balance being Ni. Alloy powder adopted by the surface alloy layer includes components by mass: 0.05-0.1% of C, 3.0-3.16% of Si, 2-4% of Fe, 16-19% of Cr and 27-30% of Mo, with the balance being Co. The surface of the hot roller restored by the method has good wear resistance, corrosion resistance and hot hardness, both toughness and strength of the inside of the hot roller are taken into account, and laser cladding effects are good.

The arc welding power supply system is formed from transformer consisting of iron core and first winding and second winding, and a auto compensator transformer is connected on the first winding of the transformer. The second winding of the auto compensator transsformer is series-connected with one end of first winding of the transformer, its first winding is series-connected with its second-winding, then is series-connected with bidirectinoal triod thyristor, finally connected on another end of first winding of the transformer, and the series-connected end of first winding and second winding of the compensator transformer is tapped and connected to power supply. The transformer and compensator transformer can be single-phase, also can be three-phase ones. The power factor is high, arc is stable, can be extensively used for transformation current regualtion and A.C and D.C. welding various metal material.

The invention relates to a laser repairing method of a hot roll good in laser cladding effect. The surface of the hot roll is laser-cladded with a transition alloy layer, an intermediate alloy layer and a surface alloy layer from the inside layer by layer; alloy powder adopted by the transition alloy layer comprises, by mass, 0.21-0.31% of C, 3.2-3.6% of Si, 1.0-1.1% of B, 2.2-2.6% of Fe, 7-8% of Cr and the balance Ni; alloy powder adopted by the intermediate alloy layer comprises, by mass, 0.4-0.5% of C, 3.8-4.3% of Si, 11.2-11.93% of B, 2.5-3.2% of Fe, 10-12% of Cr and the balance Ni; and alloy powder adopted by the surface alloy layer comprises, by mass, 0.05-0.1% of C, 3.0-3.16% of Si, 2-4% of Fe, 16-19% of Cr, 27-30% of Mo and the balance Co. The hot roll repaired by the laser repairing method of the hot roll good in laser cladding effect has good abrasion resistance, corrosion resistance and hot hardness in surface, integrates toughness and strength inside, and is good in laser cladding effect.

The invention discloses solder paste for a signal processing base board and a preparation method of the solder paste. The preparation method comprises the following steps of (1) mixing Sn-Zn alloy, nickel, cobalt, hydrated chloroauric acid, polyvinylpyrrolidone, reducing agents and water for contact reaction, so as to prepare an activated metal composition; (2) heating to dissolve rosin, rosin amine, organic acid, imidazole and diallyl phthalate isocyanuric acid, so as to prepare a mixed solution I; (3) mixing the mixed solution I, thixotropic agents and preservatives, and then cooling, so as to prepare a mixed solution II; (4) mixing the mixed solution II and polyethylene glycol, so as to prepare flux; (5) refrigerating the flux, and then dispersing and mixing the flux with the activated metal composition under vacuum in the presence of X rays, so as to prepare the solder paste for the signal processing base board. The solder paste prepared by using the preparation method has the advantages of excellent chemical stability, low welding temperature and excellent extension rate.

The invention relates to a wrapping cloth storage and transportation trolley and a maintenance method thereof. The wrapping cloth storage and transportation trolley comprises an underframe, a trolley body arranged on the underframe, a push handle arranged on the rear side of the trolley body, a plurality of wrapping cloth pipes which are arranged on the trolley body and distributed in a stepped mode, wrapping cloth clamps arranged at the tail ends of the wrapping cloth pipes, and trundles which are arranged at the four ends of the underframe and provided with brakes. The tail ends of every two adjacent wrapping cloth pipes are connected through an inverted L-shaped connecting support. The wrapping cloth pipes are distributed in the stepped mode, so that aired wrapping cloth receives sunshine by a larger area, ventilation is facilitated, and the airing effect is remarkably improved. The wrapping cloth pipes are square pipes so that the wrapping cloth pipes and the wrapping cloth clamps can be matched more firmly and reliably. The trundles are arranged at the four ends, and thus transportation of the wrapping cloth is facilitated. The surfaces of the underframe, the trolley body, the push handle, fence assemblies, the wrapping cloth pipes, a lower transverse bracket and the inverted L-shaped connecting supports are coated with Teflon coatings, so that firmness and durability are achieved, dust is not liable to adhere to the surfaces, and cleaning and disinfection are easy.

The invention discloses a medical wrapping cloth trolley. The medical wrapping cloth trolley comprises a trolley frame and a push handle arranged on the rear side of the trolley frame. A set of square wrapping cloth pipes is arranged on the trolley frame in parallel. The wrapping cloth pipes are each provided with a wrapping cloth clamp. An underframe is arranged on the lower portion of the trolley frame, fence assemblies are arranged on the underframe, and a set of trundles with pedal brakes is arranged at the four ends of the underframe. A spring shock absorber is arranged inside each trundle. The top of each trundle is further provided with an anti-collision block. An upper transverse support and a lower transverse support are arranged close to the upper end and the lower end of the push hand correspondingly. The upper transverse support is provided with a pair of fixing block assemblies, and a supporting rod is arranged between the pair of fixing block assemblies. The wrapping cloth clamps are elastically arranged on the supporting rods through torsion springs, and the front ends of the wrapping cloth clamps are pressed on the wrapping cloth pipes. The medical wrapping cloth trolley is made of 304# stainless steel and is convenient to clean.

The invention relates to a sealed distributing and collecting trolley and a maintaining method thereof. The trolley comprises a left side plate assembly, a right side plate assembly, a back plate, a double door assembly and a top cover assembly, wherein the left side plate assembly, the right side plate assembly, the back plate and the double door assembly are arranged on the four sides of a bottom plate assembly, the top cover assembly is arranged on the tops of the left side plate assembly, the right side plate assembly, the back plate and the double door assembly, and a sealed box body is jointly formed by the left side plate assembly, the right side plate assembly, the back plate, the double door assembly and the top cover assembly. The inner side face of the sealed box body is coated with a Teflon coating. Inner partition plates with the height capable of being freely adjusted are arranged in the sealed box body and made of stainless steel with the surface coated with the Teflon coating, dust staining is not likely to happen, and cleaning is easy. Multiple drive wheels connected with a motor driving system are arranged at the bottom of the right side of the bottom plate assembly. Multiple driven wheels are arranged at the bottom of the left side of the bottom plate assembly. A waterproof direct current motor is selected as a motor of the motor driving system, whole trolley cleaning and disinfecting are convenient, sanitation safety of equipment is ensured, the motor is used for driving the sealed distributing and collecting trolley, original manpower driving is replaced, and the labor intensity of medical workers is greatly lowered.