32results about How to "Good quality joints" patented technology

The invention discloses a composite zinc-aluminum flux cored wire containing beryllium and magnesium and rubidium salt. The composite zinc-aluminum flux cored wire comprises a wire body consisting of an outer metal skin and core brazing flux powder, wherein the outer metal skin is prepared by the following raw materials by weight percent: 80.5 to 98.5% of zinc, 0.01 to 6.5% of silver, 0.01 to 3% of copper, 0.001 to 2% of nickel, 0.001 to 0.5% of beryllium, 0.001 to 1.2% of magnesium, 0.001 to 0.5% of rare earth element and the balance of aluminum; and the brazing flux powder is prepared by the following raw materials by weight percent: 15 to 35% of aluminum fluoride, 30 to 75% of cesium fluoride, 2.5 to 10% of rubidium fluoride, and the balance of potassium fluoride. The invention also provides a preparation method of the composite zinc-aluminum flux cored wire. The preparation method has the advantages that trace Be and Mg are introduced based on the conventional Zn-Al-Ag-Cu alloy system in the brazing filed, so that the cleanness of the wire can be improved, the quality and the reliability of a brazing joint are ensured, and the intercrystalline corrosion resistance of the wire can be greatly improved, and as a result, the phenomenon of 'embrittlement' can be delayed or inhibited.

The invention provides a method for inducing a super-graphene network structure by utilizing femtosecond pulse laser. The method comprises the following steps: firstly, carrying out ultrasonic treatment on MWCNTs (Multi-walled Carbon Nanotubes) in a sodium dodecyl sulfate water solution to obtain non-covalent modified MWCNTs in a water environment; then coating the surface of a silicon dioxide substrate with the non-covalent modified MWCNTs by utilizing a spin-coating technology; then heating the substrate on a heating platform to remove surplus water molecules, so as to obtain an induced substrate; finally, carrying out laser radiation induction on the induced substrate. According to the method provided by the invention, accurate positioning is not needed, a technology is simple and the processing efficiency is high; the method can be used in a large scale and a connector of the obtained super-graphene network structure is smooth.

The invention provides a single-sided welding and double-sided forming welding method for A940 steel, which adopts a special ceramic liner and a gas shielded welding welding method to realize single-sided welding and double-sided forming of A940 steel. The single-sided welding and double-sided forming welding method of A940 steel solves the problem that the steel can not be welded with double-sided welding structure in engineering applications, and improves the welding efficiency. The test plate welded by the invention has beautiful welding seam shape, meets the requirements in size, non-destructive testing, ray according to GB / T3323 rating and meets the requirements of class I, penetration according to NB / T47013.5 rating meets the requirements of class I, all mechanical properties are excellent and meet GJB4000‑2000 requirements.

The invention discloses a martensitic heat-resistant steel welding rod for argon-free one-sided welding and double-sided forming for 650°C ultra-supercritical thermal power units on the back, using CaO‑CaF 2 -TiO 2 -Zr 2 o 3 Slag-based formula, the main component of the deposited metal is 9%Cr‑3%W‑3%Co. The invention has excellent single-sided welding and double-sided forming welding process performance. During welding, the coating of the electrode will melt to form a thin layer of slag that penetrates to the back of the workpiece and evenly covers the surface of the weld on the back to protect the weld from oxidation. And it is easy to clean the slag. Under the heat treatment conditions of 100℃×1h+780℃×3h, the tensile strength of the deposited metal is ≥720MPa, and the elongation of the deposited metal and the impact performance at room temperature are particularly excellent ≥150J, which is especially suitable for ultra-supercritical steam at 650℃ Argon-free single-sided welding and double-sided forming on the back of thermal power units are required.

The invention relates to the field offriction welding, and provides a friction welding heating method by using laser. Particularly, before welding, end faces of work piecesare radiated by the laser, so as to make the surface layer in ahigh temperature or micro melting state, then friction and upsetting process are conducted swiftly, so as to extrude liquid metals and parts of thermoplastic metals, finally the connection is formed through diffusion and recrystallization. According to the method, the unique advantages of highdensity of laser energy, precise and controllable airspace and time domain, and the characteristics of good quality of friction welding joint and high production efficiency and the like are synthetically utilized. The method has the advantages that external input energy is used as a main energy source; the required pressure and torque of friction welding are greatly decreased; the requirementfora welding equipment is reduced; processing ranges of traditional friction welding are expanded: the heterogenetic materials with big difference in physical and chemical characteristics, workpieces with small stiffness, thin walls and minor diameters, and workpieces with low friction coefficient, with-surface layer, high temperature and strength are welded.

The invention provides a combined triggering type friction stir plug braze welding and repair welding method and a welding tool thereof. The method comprises the following steps: 1, machining the lower end of a stirring body 2 into a stirring needle which is conical, wherein the upper part of the stirring needle is made of a metal material, and the lower part of the stirring needle is made of an aluminum zinc material; 2, determining the size of the stirring needle; 3, positioning a key hole required to be repaired; and 4, in a braze welding and repair welding process of a friction stir plug, rubbing the stirring needle with the material of the inner wall of the key hole to be subjected to repair welding, rubbing an aluminum zinc bar with the inner wall of the key hole in advance at the low temperature so as to plastify, continuing carrying out friction stir downwards by using a metal bar, and rubbing the upper part of the stirring needle of the metal bar with the inner wall of the key hole to generate heat so that the key hole which needs to be subjected to repair welding and has been filled with the aluminum zinc bar is fully filled with the aluminum zinc bar. According to the welding tool, the stirring body is arranged in a clamping hole of a clamping body, circumferential surfaces of the stirring needle at the upper end and the stirring needle at the lower end are conical surfaces, the stirring needle at the upper end and the stirring needle at the lower end form the stirring needle, and the stirring needle is exposed out of the lower end surface of a lower cylinder. The combined triggering type friction stir plug braze welding and repair welding method and the welding tool thereof are used for repair welding of the friction stir welding key hole.

The invention relates to a method for connecting glass with copper or copper alloy, particularly a method for connecting glass with copper or copper alloy by soft soldering. The invention aims to solve the problems of complex technique, high connecting temperature and poor joint quality in the existing method for connecting glass with metal. The method comprises the following steps: 1. cleaning copper or copper alloy in acetone, cleaning with absolute ethanol and deionized water, carrying out blow-drying, and baking; 2. cleaning a sanded glass substrate in acetone, cleaning with absolute ethanol and deionized water, carrying out blow-drying, bombarding with an ion beam, coating a Cr film on the glass substrate by vaporization, and coating a Cu film by vaporization; 3. cleaning low-temperature solder in acetone, cleaning with absolute ethanol and deionized water, and carrying out blow-drying; 4. preparing a rosin zinc chloride-base soldering flux; 5. assembling a soldering workpiece by using a graphite plate; and 6. putting the soldering workpiece into a heating apparatus to carry out soldering. The invention has the advantages of lower connecting temperature, simple technique and better joint quality. The invention is applicable to soldering of glass and metal.