32results about How to "Solder joints are full" patented technology

The invention provides a lead-free solder paste comprising the tin base alloy welding powder and the pewter. The components of the tin base alloy welding powder are as follows (in % by weight): Sn 91-99, Cu 0.5-3, Ag 0.5-6; the components of the pewter are as follows (in % by weight): mixed alcohol ether 25-40, natural colophony 50-70, natural vegetable oil thixotropic agent 5-15, organic acid 0.5-2.0, additives. The lead-free solder paste preparing process includes the following steps: mixing the components of the pewter in proportion, standing to room temperature, putting the pewter in a refrigerating chamber with the temperature of 1 C. to 10 C. for 48 hours; mixing the pewter and the tin base alloy welding powder in the ratio of 1 to 9 in the vacuum dispersion machine, putting the mixture in the package bottle and storing hermetically with the temperature of between 5 C. and 10 C.. The lead-free solder paste is characterized by good surface activity, moderated viscosity, and no smell.

The invention relates to the technical field of tin wires, in particular to a composite halogen-free lead-free tin wire in line with the EU (European Union) directive. The tin wires comprise the following components in parts by per unit mass: 96-98 parts of tin, 0.6-0.7 part of copper, 0.1-0.2 part of resin, 0.1-0.2 part of non-fluorochloro environmentally-friendly organic solvent, 0.05-0.06 part of thixotropic agnet, 0.02-0.4 part of organic active agent, 0.01-0.02 part of corrosion inhibitor, and 0.01-0.02 part of surfactant, wherein the tin and the copper are the solder of the tin wire, and others are soldering flux. By using said technical scheme in the invention, the product is in line with relative directive of the EU and free from lead and relative halogen. Furthermore, the reliability of the welding is high, bad welding spot cannot be formed, and the welding spot is full and bright.

The invention discloses a low-silver lead-free flux paste, which comprises abietic resin 20-50wt.%, a thixotropic agent 1-10 wt.%, a stabilizing agent 1-5 wt.%, active adjuvant 1-10 wt.%, an active agent 5-20 wt.%, and the balance solvent. The stabilizing agent is poly-alpha-olefin with ultrahigh branches, the number-average molecular weight is 2800-2900, the distribution index of degree of polymerization is 1.6-1.7, and the viscosity measured at the temperature of under 37.8 DEG C according to American Society for Testing and Materials (MSTM) D-3236 is 530cP. The active agent is long-chain linear carboxylic acid which contains 26-50 carbon atoms, the acid value is 61-115mgKOH / g, and the number-average molecular weight is 390-720. The active adjuvant is hydroxy carbazole. The flux paste and lead-free flux paste with low-silver lead-free materials can be prepared into the lead-free flux paste which has small solder balls, good welding effects and high surface insulating resistance so that a short circuit does not happen to a circuit board after welding, wettability is good, welding spots are full, and welding effects are good. In addition, corrosivity is small, and service life of a template is greatly improved. Besides, the preparation method of the flux paste is simple and easy to implement in industries in a large-scale mode.

The invention discloses a welding method for an embedded nut connecting piece, and by the adoption of the welding method, the nut can be reliably welded to a mounting bottom plate. The embedded nut connecting piece comprises the mounting bottom plate and a containing hole which is formed in the mounting bottom plate and matched with the nut. The welding method comprises the following steps that 1), a circle of annular trench is formed in the side face of the nut to be welded in the peripheral direction, and the distance between the lower side face of the trench and the bottom face of the nut is equal to the thickness of the mounting bottom plate; 2), the nut is put into the mounting hole of the mounting bottom plate, and at least three welding points are selected for welding with the center line of a threaded hole of the nut as the center in the circumferential direction; and 3), the welded embedded nut connecting piece is subjected to post-heat treatment. The welding method is extremely wide in application range.

The invention discloses soldering paste special for aluminum material soldering and a preparation method and a using method thereof. The soldering paste is prepared from, by weight, 84-89% of solder powder, 8-12% of scaling powder and 2-5% of a dispersing agent. The solder powder is prepared from, by weight, 3.2-4.8% of Zn, 1.6-2.4% of Bi, 0.7-1.3% of In, 0.4-0.8% of Ga, 0.2-0.5% of Sb, 0.1-0.3% of Ru and the balance Sn. The scaling powder is prepared from, by weight, 40-50% of a main material, 20-35% of a solvent, 8-16% of an activating agent, 4-8% of a thixotropic agent, 2-4% of a surfactantand 1-3% of antioxidant. The soldering paste has excellent tin soldering performance, welding spots are full, bright and firm, and lead is not used, so that safety and environment protection are achieved.

The invention relates to rosin for flux, a preparation method and application, and belongs to the field of basic resin for flux. The rosin for soldering flux of the present invention is prepared by using the rosin containing nanasinic acid as a raw material. The rosin for flux of the present invention has excellent solubility and anti-crystallization performance in the flux solvent system, has high flux activity and low corrosiveness, and has good wetting performance for lead-free solder; and has good thermal stability, Good film formation, the formed solder joints are full, bright and regular.

The invention relates to a leadless tin soldering material which comprises the constituents (by mass ratio) of Ag 0.5-6%, Cu 0.1-2%, In 0.0001-1%, P 0.0001-1%, and balancing Sn. The preparing process of the soldering material comprises weighing 1.67-20 parts of Sn-Ag intermediate alloy ingot containing Ag 30%, 1-20 parts of Sn-Cu intermediate alloy ingot containing Cu 30%, 0.002-20 parts of Sn-In intermediate alloy ingot containing In 5%, P 0.0001-1 part, and balancing Sn in the whole 100 parts, charging the raw materials into manganese alloy crucible, smelting in intermediate frequency furnaces, evacuating and filling in nitrogen, elevating the temperature to 450 deg. C, agitating 1 hour, cooling down slowly and homogeneously to 340 deg C, charging weighed P and stirring homogeneously, finally pouring the melted liquid into dies.

The invention discloses a low-splash and halogen-free welding agent for tin wires and a preparation method thereof. The welding agent is mainly used for agent cores of tin-based alloy tin wires. The welding agent is composed of, by weight, 80-90% of rosin and rosin derivatives, 5-15% of active agents, 0.1-2% of efficient surface active agents, 0.5-2% of corrosion inhibitors and 3-10% of viscosity modifiers. The prepared halogen-free welding agent for the tin wires is needless of any halogen element, is little in splash and smoke when welding is conducted, has high activity, is high in surface insulation resistance, and can be used for preparing tin-lead series tin wires, tin-copper series tin wires and tin-silver-copper series tin wires. The prepared tin wires are good in wetting performance, high in reliability after being welded, and light and full in welding point.

The invention proposes a lead-free paste welding material and a preparation method thereof. The lead-free paste welding material is prepared by mixing lead-free solder alloy powder with a flux according to a mass ratio of 10-11: 0.9-1.2; the lead-free solder alloy powder is prepared by the following raw materials: 5-10 wt% of Zn, 0.1-0.2 wt% of Ti, 0.6-2.4 wt% of graphene, and the balance of Sn; and the flux has the following components: 40-50 wt% of adhesive film forming agent, 3-12 wt% of activating agent, 2-8 wt% of thixotropy anti-sinking slipping agent, and the balance of solvent. The preparation method comprises the following steps: the lead-free solder alloy powder and the flux are mixed according to the mass ratio of 10-11: 0.9-1.2; the flux is firstly put in a synthesizer; then, solder powder of the lead-free solder alloy powder is added; the synthesizer is sealed; then, a vacuum system is started for vacuumizing to fill nitrogen to reach positive pressure; a stirring system is started for stirring; the stirring is stopped; and the discharge is performed to obtain the lead-free paste welding material. The lead-free paste welding material is excellent in welding point combination strength; and meanwhile, the flux is better in oxidation resistance without needing to add antioxidant.

The invention discloses an air conditioner liquid storage device welding protection device and an application method thereof, and belongs to the technical field of welding. The air conditioner liquid storage device welding protection device comprises an outer ventilation block and an inner ventilation block. The outer ventilation block is of a rectangular block-shaped structure and is provided with a transverse air blowing hole and longitudinal air blowing holes and connected with an air source through an outer ventilation connecting hole. An inner air blowing hole is formed in the inner ventilation block and connected with the air source through an inner ventilation connecting hole. According to the method, a cylinder is inflated with protection air through the inner ventilation block in the welding process, the welding position is immediately inflated with the protection air through the outer ventilation block after welding is finished, and air is prevented from making contact with a welding line. By means of the air conditioner liquid storage device welding protection device and the application method thereof, the surface of a welded part can be prevented from being oxidized during liquid storage device welding, the connecting strength of the welding line is improved, the quality of a finished product is improved, and the production cost is reduced.