52results about "Welding/cutting media/materials" patented technology

A welder for welding a base metal. The welder may include a first electrode for forming a first arc with the base metal and a second electrode for forming a second arc between the first and second electrodes. A compact welder, welding system, and method are also provided.

A flux without halogen, rosin and washing for Pb-free solder contains activating agent (8.0-15.0 Wt %), cosolvent (28-40), filming agent (0.1-1.0), corrosion retardant (0.1-0.5) and the solvent and deionized water (rest).

Disclosed is tin characterized in that a sample of the tin after melting and casting has an α dose of less than 0.0005 cph/cm². Since recent semiconductor devices are highly densified and of high capacity, there is an increasing risk of soft errors caused by the influence of α rays emitted from materials in the vicinity of semiconductor chips. In particular, there are strong demands for high purification of solder materials and tin for use in the vicinity of semiconductor devices, and demands for materials with lower α rays. Accordingly, an object of the present invention is to clarify the phenomenon of the generation of α rays in tin and tin alloys, and to obtain high-purity tin, in which the α dose has been reduced, suitable for the required materials, as well as a method for producing the same.

The invention provides a low-silver halogen free soldering paste, which solves the problems that the existing soldering paste has high production cost and poorer soldering performance, and is not applicable to welding of components with precision spacing and the like. The low-silver halogen free soldering paste comprises the following components by weight percentage of 88 percent to 91 percent ofalloy welding powder and 9 percent to 12 percent of paste flux, wherein, the alloy welding powder comprises the following components by weight percentage of 0.1 percent to 0.9 percent of Ag, 0.1 percent to 0.8 percent of Cu and the balance Sn. The low-silver halogen free soldering paste has the advantages of low cost, good welding performance, no easy edge-collapse after printing and the like.

An edge of an aluminum 5xxx series sheet is welded to another aluminum 5xxx series sheet utilizing a low magnesium content aluminum alloy filler. The bottom weld seam metal is heat dressed as by a TIG and subsequently the bottom and the top, are planished to the same thickness as the sheets. Favorable properties such as the elimination of nail heads, improved corrosion resistance, and bendability are obtained.

The invention relates to a self-protection flux-cored welding wire for full-position and high-toughness welding. A flux core comprises the following components in percentage by weight: 2 to 7 percent of Mn, 3 to 6 percent of Ni, 1 to 10 percent of Al, 1 to 20 percent of Mg, 1 to 10 percent of carbonate, 10 to 60 percent of fluoride, 0.5 to 8 percent of TiO2, 0.5 to 6 percent of SiO3, and the balance of iron powder; and the flux core accounts for 16 to 30 percent of the total weight of the welding wire. The self-protection flux-cored welding wire has the advantages of good toughness and plasticity of weld metals, little splash and good full-position welding performance, and remarkably improves the slag detachability and weld formation property.

The invention relates to a method for cleaning and oiling the surface of a flux-cored wire and a device thereof. The method comprises the steps of: controlling the wire drawing linear speed at the range of 5-300m/min, spraying the wire surface by using a sprayer, wherein the linear speed is greater than 300m/min, starting a cleaning liquid pump to water the wire surface, and closing the sprayer, wherein the speed is less than 300m/min, stopping the cleaning liquid pump and turning on the sprayer, and then oiling with an oiling engine after spraying, watering and wire drawing. In the device, compressed air pipes are respectively connected with two pressure regulating valves and two electromagnetic valves; the pressure regulating valve and the electromagnetic valve are communicated with a cleaning liquid box through a tee-junction outlet pipe; and the other way of electromagnetic valve and pressure regulating valve is connected with the sprayer by a tee-junction; a water pump is arranged on the cleaning liquid box and is communicated with a drencher through a flow switch by a pipeline; the sprayer, a wortle and the drencher are all arranged in a watering withdrawing box; a water return port is arranged at the bottom of the box body and is communicated with the cleaning liquid box through the pipeline.

The present invention relates to an aluminum alloy brazing sheet (1) for a heat exchanger improved in a life including a fatigue in a plastic area and an aluminum alloy heat exchanger tube (11) using the brazing sheet, which is composed of: a core material (2) of an Al—Mn series alloy; a skin material (3) of any one of an Al—Zn series alloy, an Al—Zn—Mg series alloy, an Al—Si—Mn—Zn series alloy, and an Al—Si—Mn—Mg—Zn series alloy clad on one side of the core material; and a brazing material (4) of an Al—Si series alloy clad on the other side of the core material, and is adapted so that an X-ray diffraction intensity ratio of the aluminum alloy brazing sheet satisfies a relational expression of I200/(I111+I200+I220+I311)≧0.4.

The inention discloses a Ni-Cr-Al-Ti-Co welding wire. The Ni-Cr-Al-Ti-Co welding wire comprises a flux core and a welding skin, wherein the flux core is composed of, in percentage by mass, 20.0%-30.0% of Cr powder, 10.0%-20.0% of Al powder, 10.0%-20.0% of Ti powder, 5.0%-10.0% of Co powder and the balance Ni, and the sum of the mass percentages of the components is 100%. The Ni-Cr-Al-Ti-Co welding wire is specially used for welding a transition layer in the butt welding process of a copper-steel explosion composite plate, and the problem that a welding seam cracks in the welding process of the copper-steel explosion composite plate can be effectively solved. The invention further discloses a preparation method of the Ni-Cr-Al-Ti-Co welding wire and a groove form.

The invention discloses a flux for SnAgCuNiGe alloy solder paste and a preparation method, comprising a polymerized rosin 25% to 30%, a hydrogenated rosin 8% to 16%, a rosin alcohol 6% to 12%, a modified and hydrogenated castor oil 2% to 3%, a hydrogenated castor oil wax 2% to 3%, an organic acid and halogen compound and other active agents 6% to 11%, a hydroquinone and other antioxidant 0.5% to 3%, a surface-active material 2% to 4%, and an organic solvent. The invention is characterized in that: the polymerized rosin, the hydrogenated rosin, the rosin alcohol, the organic solvent, the modified and hydrogenated castor oil, the hydrogenated castor oil wax, the active agent, and the antioxidant are utilized in turn and heated at temperatures of no more than 130 degrees Centigrade, then are sufficiently dissolved, evenly mixed and cooled to ambient temperature, finally the surface-active material is added to the mixture, and the cooling process is kept on for two to three hours, and the flux is obtained. The invention has an advantage of meeting demands of customers to the service life of the solder paste and requirements to the printing performance and welding property for the solder paste.

Disclosed for use in treating a metal, e.g., an alloy of silver as aforesaid, is a water-based composition comprising a treatment agent selected from an alkanethiol, alkyl thioglycollate, dialkyl sulfide or dialkyl disulfide and at least one of an amphoteric, nonionic or cationic surfactant in a concentration that is effective to solubilise the treatment agent. Preferably the composition comprises at least a non-ionic relatively hydrophobic surfactant e.g. cocamide DEA. The composition is particularly suitable for the treatment of Ag—Cu—Ge alloys.

The invention relates to a welding wire for steel-copper dissimilar metal submerged-arc welding and a welding method of the welding wirearc, belonging to the field of submerged-arc welding. The welding wire comprises the following chemical components in percentage by weight: 0.05-0.15% of arcbon, 0.80-2.10% of manganese, 0.07-0.95% of silicon, 0-0.03% of sulphur, 0-0.03% of phosphorus, 0.20-0.35% of copper, 0-0.20% of chromium, 0-0.30% of nickel and the balance of iron; the welding method comprises the following steps that: before being welded, a copper plate and a steel plate are not preheated; the steel plate and the copper plate are fixed by using gas shield welding spot welding; steel-copper dissimilar metal submerged-arc welding wires are used for matching with SJ101 welding flux so as to carry out submerged-arc welding; when being welded, the welding wire deviates 4mm-8mm from the side of the copper plate; the welding current is 396-630A; the welding voltage is 35-40V; and the welding speed is 23-30m/h. The welding joint obtained by the welding method provided by the invention has the characteristics of good mechanical performance, high efficiency, beautiful appearance and little crack, etc.

The invention belongs to the technical field of welding materials, and particularly relates to a bridge steel Q690qE matched flux-cored wire and a preparing method thereof. The flux-cored wire is manufactured in the manner that a low-carbon cold-rolled steel strip is wrapped by flux core powder, and the flux core powder accounts for 20%-35% of the total mass of the welding wire. The flux core components include, by mass percent, 3.0%-5.5% of FNiN-50 nano nickel powder, 0.5%-1.2% of nano chromium nitride powder, 0.2%-0.4% of nano graphene, 0.2%-0.8% of nano cerium oxide, 1.2%-2.0% of FeMn84C0.05 micro carbon ferromanganese, 1.0%-2.0% of AlSi50 aluminum intermediate alloy, 0.25%-0.45% of Nb powder, 2.5%-4.5% of Mo powder, 0.4%-1.0% of Cu powder, 0.5%-1.0% of zirconium hafnium alloy powder (the mass ratio of zirconium to hafnium is 96:4), 2.5%-3.5% of KBF4 and the balance FHT100.25 reduced iron powder.

The invention provides a welding wire material for austenitic stainless steel. The welding wire material comprises the following chemical ingredients in percentage by weight: 0.011 to 0.078 percent of C, 0.15 to 0.32 percent of Si, 1.57 to 2.39 percent of Mn, less than or equal to 0.023 percent of P, less than or equal to 0.013 percent of S, 25.59 to 25.82 percent of Cr, 8.17 to 8.87 percent of Ni, less than or equal to 0.43 percent of Mo, less than or equal to 0.058 percent of N, 0.09 to 0.39 percent of Cu, 0.03 to 0.042 percent of rare-earth element Re and the balance of Fe and inevitable impurities. Aiming at the austenitic stainless steel containing the rare-earth element and the austenitic stainless steel and ordinary steel, the invention provides the welding wire material for the austenitic stainless steel, which is scientific in design, convenient to use and high in deposition rate, the sensitivity of metal cold cracks at weld joints after welding is low, and the performance of metal at the weld joints is close to that of base metal.

The invention discloses brazing filler metal for brazing of stainless steel and a preparation method of the brazing filler metal. The brazing filler metal comprises, by weight, 33-37% of Fe, 8-12% of Si, 10-25% of Mn and the balance Ni. The preparation method comprises the steps that the components are weighed according to the formula, then the components are placed into a vacuum arc furnace, vacuum pumping is conducted, and argon is fed into the vacuum arc furnace to conduct uniform smelting. Compared with the prior art, the brazing filler metal has the advantages that the melting point is low, wettability and jointing performance are good, and joint strength of the stainless steel brazed with the brazing filler metal is high.

The invention discloses a novel protective agent for a back of a stainless steel weld. The novel protective agent comprises a raw material containing the following components in mass percent: 25-35 percent of magnesium oxide, 2.5-7 percent of aluminum oxide, 5-10 percent of titanium dioxide, 3.5-6.5 percent of calcium oxide, 5-8 percent of sodium chloride, 10-15 percent of manganese oxide, 6.5-10 percent of silicon dioxide, 2-3.5 percent of adhesive and the balance of acetone; the invention also discloses a preparation method for the protective agent. Through the manner, according to the novel protective agent for the back of the stainless steel weld, disclosed by the invention, the back of the weld can be free of oxidation, has a good shape and is smooth; meanwhile, the novel protective agent has good surface corrosion resistance and high pressure resistance, and is especially suitable for the back protection in stainless steel TIG (tungsten inert gas) welding.

The invention relates to an aluminum magnesium alloy welding flux and a preparation method of the aluminum magnesium alloy welding flux. The welding flux is prepared from, by weight, 5-6% of Mg, 0.08-0.12% of Cr, 0.1-0.2% of Fe, 0.1-0.2% of Si, 0.3 of Fe and Si, 0.01-0.05% of Cu, 0.03-0.05% of Zn, 0.1-0.15% of Mn, 0.08-0.12% of Ti, 0.1-0.2% of In, 0.01-0.015% of graphene, and the balance Al and inevitable impurities. According to the aluminum magnesium alloy welding flux, by optimizing raw material composition and adding In and graphene, the strength and wettability of the welding flux are effectively improved, and therefore the welding flux has good welding performance.

A titanium type gas-shielded flux-cored wire comprises a welding wire flux core. The mass of the welding wire flux core is 10%-20% the total mass of the flux-cored wire. The welding wire flux core comprises, by weight, TiO2 of 35%-50%, SiO2 of 3%-10%, Al2O3 of the proportion larger than 0 and smaller than 1%, ZrO2 of the proportion larger than 0 and smaller than or equal to 1% and the balance of alloyed powder. The alloyed powder comprises the following constituents: manganese metal, ferrosilicon, ferrotitanium, magnesium powder and the balance of iron powder, wherein the weight percentages of the manganese metal, the ferrosilicon, the ferrotitanium and the magnesium powder in the welding wire flux core are 10%-20%, 1%-5%, 0.5%-2.5% and 4%-7% respectively. The content of the oxides of Al2O3 and ZrO2 which respectively have a higher melting point than TiO2 is reduced as much as possible so as to reduce the content of the impurity of nonmetal oxide in deposited metal, and therefore the effect of improving crack resistance and mechanical properties can be achieved. The titanium type gas-shielded flux-cored wire is mainly suitable for low-carbon steel welding with high requirements for crack resistance.

The invention discloses a molybdenum/steel connector and a preparation method thereof. A connecting layer of the molybdenum/steel connector has a sandwich type three-layer structure and comprises twoNi76CrP solder layers for being connected with molybdenum and steel correspondingly and a metal foil layer located between the two Ni76CrP solder layers. The preparation method comprises the followingsteps that 1, a proper amount of Ni76CrP welding powder is taken, glycerol is added to be blended, and Ni76CrP paste solder is obtained; and 2, the to-be-connected end faces of a steel block and a molybdenum block are coated with each coated with a layer of Ni76CrP paste solder obtained in step 1, then metal foil is placed between the two Ni76CrP paste solder layers, the steel block and the molybdenum block are closed, finally the load of 10 kPa is applied, overall brazing is carried out, brazing is carried out under the vacuum condition, the temperature is raised to 1000 DEG C to 1100 DEG C,heat preservation is carried out for 10 min, and the molybdenum/steel connector is obtained. The preparation method is simple and easy to operate, and raw material cost is low. The prepared molybdenum/steel connector is even and dense in layer, good in interface bonding, free of cracks and pores and other defects and high in connecting strength.