52results about How to "Improve brazing strength" patented technology

A multi-layer aluminum brazing sheet including a core layer, interliner, braze clad layer and a sacrificial layer, in which the post-braze strength of the brazing sheet is optimized by controlling the manganese (Mn), silicon (Si), copper (Cu) and magnesium (Mg) contents of the core layer and the Mn, Si and Cu content of the interliner and the Mn, Si and Zn content of the sacrificial layer and the specifics of the braze thermal cycle. The brazing sheet maintains corrosion resistance, while optimizing post-braze strength, by utilizing 0.5 wt. % to 1.2 wt. % Cu in the interliner. Further, the interliner and sacrificial layer of the brazing sheet contain low or no magnesium to maintain the brazing sheet's braze-ability.

In a method of manufacturing a plate type titanium heat exchanger in which a plurality of titanium herringbone plates are laminated and flow paths are formed between the respective herringbone plates, after brazing materials are charged or coated to the joints between the herringbone plates, respectively, the herringbone plates are placed in a vacuum heating furnace, subjected to vacuum degas processing while being gradually heated, and joined to each other by brazing by being more heated after a prescribed vacuum pressure has been obtained.

The object of the present invention is to provide at a low cost iron-base heat- and corrosion-resistant brazing material which make it possible to braze parts made of a base metal selected from among various stainless steels, particularly ferritic stainless steels, at a practical temperature (of 1120° C. or lower) and are excellent in the wetting property against the base metal and which can attain excellent resistance to corrosion by sulfuric acid or nitric acid and high strength without coarsening the structure of the base metal. The iron-base heat- and corrosion-resistant brazing material is characterized by comprising 30 to 75 wt % of Fe, 35 wt % or less of Ni and 5 to 20 wt % of Cr in a total amount of Ni and Cr of 15 to 50 wt %, and 7 wt % or less of Si and 4 to 10 wt % of P in a total amount of Si and P of 9 to 13 wt %. The iron-base heat- and corrosion-resistant brazing material further comprising 0.5 to 5 wt % of Mo and/or 0.3 to 5 wt % of Cu in a total amount of Mo and Cu of 1 to 7 wt % is more preferable.

The invention discloses a copper-based amorphous brazing material and a preparation method thereof, as well as a strip and a preparation method thereof. The copper-based amorphous brazing material doesn't contain a P element and a B element, but comprises Cu, Si, Sn, Ni and at least one IVB group element in Ti, Zr and Hf. The weight ratio of Cu, Si, Sn and at least one IVB group metal in Ti, Zr and Hf is (71-83):(0.15-0.22):(4.0-6.8):(13.5-14.3):(0.02-0.06). The copper-based amorphous brazing material and the preparation method thereof, as well as the strip and the preparation method thereof have the advantages as follows: 1), the P element is removed, so that the toughness of the brazing material is greatly improved; and 2), a micro amount of one or combinations of three IBV group elements, namely Ti, Zr and Hf is or are added, so that the brazing temperature is not increased, and the brazing strength is improved and a mechanical property of a brazing joint is guaranteed at the same time. The invention further discloses the preparation method of the copper-based amorphous brazing material, the copper-based amorphous brazing material strip made of the copper-based amorphous brazing material and the preparation method of the copper-based amorphous brazing material strip.

The invention discloses a brazing filler metal for the braze welding of titanium and titanium alloy, which contains 22 to 32 percent by weight of Ni, 1 to 1.5 percent by weight of Al, 0.5 to 1.0 percent by weight of Mn, 0.3 to 0.6 percent by weight of V, 0.6 to 1.0 percent by weight of Sn, 1.5 to 2 percent by weight of Zr and the balance of Cu. The preparation method for the brazing filler metal includes the following steps: weighing the materials, casting the smelted materials to form a brazing filler metal ingot, and then extruding and rolling the brazing filler metal ingot into a braze welding foil. An argon-shielded condenser discharge resistance heating method is adopted to weld titanium with the brazing filler metal. The brazing filler metal does not contain precious metals, i.e. palladium and silver, and thereby the manufacturing cost can be greatly reduced; the processability of the brazing filler metal is good, the inter-annealing processing rate is high, a foil strip which is 0.1mm can be rolled, and the rate of finished products is 80 to 85 percent. Meanwhile, the preparation method is simple, the strength of a braze-welded titanium joint is high, the braze-welding timeis short, the metallic texture of the titanium alloy matrix cannot be changed, and in particular, the invention is suitable for the braze welding of titanium alloy parts of small specifications in large batches.

The invention discloses a CVD (chemical vapor deposition) diamond brazing nickel-based alloy brazing sheet and a preparation method thereof. The CVD diamond brazing nickel-based alloy brazing sheet comprises the following components in weight percentage: 8.0-12% of Cr, 2.5-4.0% of Si, 1.5-2.0% of B, 7.8-11% of Sn, 0.4-1.0% of Ag, 0.1-1.0% of lanthanum neodymium, not more than 0.05% of impurities and the balance of Ni. The CVD diamond brazing nickel-based alloy brazing sheet overcomes the defects that the conventional Ag-based brazing material is high in cost and low in strength; the CVD diamond brazing nickel-based alloy brazing sheet contains Sn, so that the problems that the conventional Ni-Cr brazing material is high in melting point and poor in filling ability are solved; when the prepared nickel-based alloy brazing sheet is used for brazing a CVD diamond, the CVD diamond and the brazing sheet can form a chromium carbide compound, so that the bonding strength between the CVD diamond and the brazing sheet is high; the melting point of the brazing sheet is relatively low, so that heat damage to the CVD diamond is relatively small and the brazing sheet is easy to braze.

The invention discloses a lead-free copper-based amorphous brazing material. The lead-free copper-based amorphous brazing material comprises the following components according to the total mass percent of 100%: greater than or equal to 0.02% and less than or equal to 0.06% of P, greater than or equal to 0.02% and less than or equal to 0.06% of Bi, greater than or equal to 4.0% and less than or equal to 6.8% of Sn, greater than or equal to 13.5% and less than or equal to 14.3% of Zn, greater than or equal to 0.15% and less than or equal to 0.22% of Ce, greater than or equal to 71% and less than or equal to 83% of Cu and the balance of impurities. According to the lead-free copper-based amorphous brazing material, the Bi element is specially added and the Cu element is completely removed; a microscopic structure morphology of the lead-free copper-based amorphous brazing material is analyzed, and the tensile strength, the percentage elongation after fracture and the Vickers hardness of the lead-free copper-based amorphous brazing material are tested; a result shows that the Bi element is added so that the tensile strength and the hardness of the lead-free copper-based amorphous brazing material can be remarkably improved and the Bi is added so that a needle-shaped or grain-shaped zinc-enriched phase can be separated out from the brazing material.

A composite brazing aluminum foil material for an automobile radiator and a method for producing the material, the core layer of which is composed of: 0.5-0.8% of silicon, 0.20-0.30% of iron, 0.30-0.40% of copper, 1.0-1.8% of manganese, and 0.005-0.005% of chromium 0.035%, titanium 0.12-0.20%, the rest is aluminum. The production method is characterized in that: After melting the industrial pure aluminum ingot (Al99.70A) for remelting, add iron, copper, manganese, chromium and titanium in the above ratio, heat to 740°C-760°C, stir , to make the composition uniform, let stand after removing slag, cast at 720°C ~ 740°C, and then cast into an ingot. Aluminum-silicon type brazing material (AA4343 or AA4045 alloy), heated to 520°C-540°C after being fixed, kept for 10 hours, and then hot-rolled to obtain hot-rolled coils, which were then cold-rolled.

The invention belongs to the technical field of structural part processing, and discloses a preparation method of a corrugated sheet sandwich partition board assembly. The preparation method comprisesthe following steps that finish milling is carried out on a rough material, after holes are punched in the rough material by using electric sparks, linear cutting is carried out to obtain an inner cavity and the peripheral shape of a concentric-square-shaped square frame, then surface burrs are removed, grinding is carried out to remove an electric ablation layer, the inner cavity is subjected topolishing treatment, and an outer partition board is obtained; a blank is subjected to fine milling, linear cutting is carried out on the blank according to the size requirement to obtain a corrugated shape, surface burrs are removed, grinding is carried out to remove the electric ablation layer, the surface is subjected to polishing treatment, and a corrugated sheet is obtained; and the obtainedouter partition board and corrugated sheet are cleaned, amorphous foil-shaped brazing filler metal of 0.05 mm is prearranged on the surface of the corrugated sheet through spot welding treatment, then the corrugated sheet and the brazing filler metal are pressed into an inner cavity of the outer partition board together, the outer partition board is pressed through a pressing plate tool, the corrugated sheet is welded into the inner cavity of the outer partition board through brazing treatment, and the corrugated sheet sandwich partition board assembly is obtained. The preparation method is simple and scientific in link.

The invention discloses a manufacturing method for lead-free copper-based amorphous brazing filler metal. The total mass percent of the lead-free copper-based amorphous brazing filler metal is 100%, wherein 0.02%<=P<=0.06%, 0.02%<=Bi<=0.06%, 4.0%<=Sn<=6.8%, 13.5%<=Zn<=14.3%, 0.15%<=Ce<=0.22%, 71%<=Cu<=83%, and the balance is impurities. The manufacturing method includes the steps of material preparing and alloy smelting. The Bi element is specially added, meanwhile, the Cu element is thoroughly removed, the microscopic structure morphology of the lead-free copper-based amorphous brazing filler metal is analyzed, the tensile strength, elongation percentage after fracture and Vickers hardness of the lead-free copper-based amorphous brazing filler metal are tested, and the results show that by adding the Bi element, the tensile strength and hardness of the lead-free copper-based amorphous brazing filler metal can be obviously improved, and the brazing filler metal can be promoted to be precipitated to obtain needle-shaped or particle-shaped zinc-rich phases.

The invention discloses a brazing copper alloy with high strength and corrosion resistance. The brazing copper alloy comprises the following ingredients in percentage by mass: 2.8-4.0% of Si, 0.5-1.5% of Mn, 0.2-1.0% of Mg, 0.1-0.8% of Ti, 0.01-0.1% of Ce and the rest amount of Cu. The brazing copper alloy disclosed by the invention has the advantages of high brazing strength, excellent corrosion resistance and good machining performance. As a small amount of Ti, Ce and Mg is added in the Cu-Si alloy, the brazing alloy provided by the invention has an obviously-fined grain size for casting line blanks, and the grain size is about one third of that of the S211 alloy; and the machining hardening ratio is obviously lowered, and the processing capability is enhanced.

Cutting elements having a slanted top surface for an improved cutter to blade transition, the slanted top surface being integratable into a receiving pocket of a bit blade such that the slanted top surface and the perimeter of the receiving pocket are relatively contiguous when the slanted cutter is mounted within the receiving pocket. Also, a bit with slanted cutters as well as a method of manufacturing a bit having slanted cutters.

The invention discloses a brazing titanium-copper alloy with high strength and corrosion resistance. The brazing titanium-copper alloy comprises the following ingredients in percentage by mass: 2.8-3.5% of Si, 1.0-1.2% of Mn, 0.2-0.4% of Ti, 0.05-0.08% of Ce and the rest amount of Cu. The brazing titanium-copper alloy disclosed by the invention has the advantages of high brazing strength, excellent corrosion resistance and good machining performance. As a small amount of Ti and Ce is added in the Cu-Si alloy, the brazing alloy provided by the invention has an obviously-fined grain size for casting line blanks, and the grain size is about one third of that of the S211 alloy.

The invention provides high-activity flux-cored brazing filler metal capable of improving the brazing strength of heterogeneous materials and a preparation method of the high-activity flux-cored brazing filler metal. The flux-cored brazing filler metal comprises a flux core and an outer skin at least partially wrapping the surface of the flux core. Wherein the outer skin comprises the following components in parts by mass: 30-55 parts of silver; 25 parts by mass to 50 parts by mass of copper; 20 parts by mass to 45 parts by mass of zinc; 1.5 parts by mass to 2.5 parts by mass of cobalt; the outer skin further comprises 0.2-0.7 part by mass of germanium; and/or 0.2 to 0.7 part by mass of silicon; and/or 0.1 to 0.3 part by mass of an active metal; the active metal comprises at least one of titanium, chromium and zirconium; the flux core comprises silver-based brazing flux; the flux core further comprises aluminum and/or silicon. Alloy components are optimized, cobalt and trace active metal elements are added, and the strength of brazed joints between steel and hard alloy and between high-temperature alloy and hard alloy and other dissimilar metal is improved.

In a branch tee fitting (1) fabricated by press forming, in order to enhance the brazing strength thereof and the brazing workability thereof by allowing separate brazing of pipes (P) to a tubular body portion (11) and a tubular branch portion (12), engaging pawls (14) are provided which engage flat portions (13) superposed to each other in angles between the tubular body portion (11) and the tubular branch portion (12).

The invention discloses a manufacturing method for a lead-free copper-based amorphous brazing filler metal strip. The lead-free copper-based amorphous brazing filler metal strip is made of lead-free copper-based amorphous brazing filler metal. The total mass percent of the lead-free copper-based amorphous brazing filler metal is 100%, wherein 0.02%<=P<=0.06%, 0.02%<=Bi<=0.06%, 4.0%<=Sn<=6.8%, 13.5%<=Zn<=14.3%, 0.15%<=Ce<=0.22%, 71%<=Cu<=83%, and the balance is impurities. The manufacturing method includes the steps of material preparing, alloy smelting and strip manufacturing. The Bi element is specially added, meanwhile, the Cu element is thoroughly removed, the microscopic structure morphology of the lead-free copper-based amorphous brazing filler metal is analyzed, the tensile strength, elongation percentage after fracture and Vickers hardness of the lead-free copper-based amorphous brazing filler metal are tested, and the results show that by adding the Bi element, the tensile strength and hardness of the lead-free copper-based amorphous brazing filler metal can be obviously improved, and the brazing filler metal can be promoted to be precipitated to obtain needle-shaped or particle-shaped zinc-rich phases.

The invention provides a bore machining cutter head and a bore machining cutting tool, which are cheap to manufacture and high in brazing strength. The bore machining cutting tool (T) is formed by installing a bore machining cutter head (1) onto a cutter rod (100). The bore machining cutter head (1) comprises a rod-shaped tool body (2); and a cutter head (4) of a cutting edge (3) protruded to the side (17) out of the rod-shaped tool body (2) with the lower surface (16) thereof arranged on the tool body (2). The lower surface (16) and the upper surface (18) of the cutter head (4) of the cutting edge (3) are partially clamped by the tool body (2). The upper surface (18) of the cutter head (4) of the cutting edge (3) is partially brazed to the tool body (2).