Showing papers on "Filler metal published in 1986"

Method for repairing a steam turbine or generator rotor

Abstract: This is a method for repairing low alloy steel steam turbine (both high pressure and low pressure sections) or generator rotors. The defective section of the original rotor is removed and a replacement end is used, with mating attachments machined on the replacement end and the original rotor. The inner portion of the weld joining the replacement end to the original rotor is provided by a narrow gap weld, either by gas metal or by submerged arc welding. The outer 1/2-2 inches of the weld is provided by gas tungsten arc welding. The mating attachment and at least the inside 1/4 inch of the weld is bored out to remove possible crack initiation sites and to provide a smooth inspectable bore. In this manner, a fast and reliable technique is provided which provides accurate alignment, fast, essentially distortion free welding, and the superior mechanical properties of gas tungsten arc welding in the outer, more highly stressed zones.

Method of bonding ceramics and metal, or bonding similar ceramics among themselves; or bonding dissimilar ceramics

Abstract: A bonding method using, as bonding agent, brazing filler metal, or composite plating, or a combination of composite plating and ceramic spraying. In the first case, there are provided on the bonding region titanium powder and brazing filler metal alloyable with the titanium and having a lower melting point than titanium. The heating temperature is set higher than the melting point of the brazing filler metal but not so high to melt titanium. In the second case, the bonding region is coated with composite plating. Plating base material is made of metal alloyable with titanium and having a lower melting point than titanium. Titanium powder is diffused into the plating base material. The heating temperature is set higher than the melting point of the plating base material but not so high to melt titanium. In the last case, the bonding region is coated with the above composite plating, and further covered with ceramic spraying. The heating temperature is set in the same manner as the second case.

Titanium-copper-nickel braze filler metal and method of brazing

Abstract: A filler metal material particularly suited for brazing titanium base articles is described. In a preferred embodiment, the material is characterized by a central portion of titanium, and adjacent layers of copper and nickel. The solidus and liquidus temperatures of the filler metal are about 925° and 945° C., respectively.

Semi-automatic hot wire tig welding equipment

Abstract: A semi-automatic hot wier TIG (Tungsten Inert Gas) welding equipment comprising: a portable TIG arc torch; a portable filler wire feed torch; a hot wire switching power source for energizing the TIG arc torch, the filler wire feed torch and a base metal; a filler wire feeding device for feeding the wire to the wire feeding torch at a desired rate; a welding condition control device for controlling wire heating power so as to provide wire heating power commensurate to the wire feed rate; means for measuring the resistance value of the wire extension section between the terminal end of the wire and the terminal end of the filler wire feed torch; and means for controlling said filler wire feeding means to change the wire feed rate in response to the detected wire extension According to the present invention, the welding operations are performed while the filler wire feed torch is held in one hand and the TIG arc torch is held in the other hand, so that the position where the arc and wire are inserted can be desireably adjusted Adjustment of the welding conditions such as regulation of the welding arc current and adjustment of wire feed rate can be readily performed during welding

Brazed composite compact implements

Abstract: Disclosed is an improved implement comprising a cemented carbide supported composite abrasive compact which is brazed to a cemented carbide substrate with a brazing filler metal having a liquidus substantially above 700° C. The composite compact preferably is a composite polycrystalline diamond compact. The brazing filler metal is a brazing alloy which has the following composition, by weight: Pd: 20-80% Cr: 2-13% B: 1-4% Ni: balance.

Effects of Ultrasonic Vibration on Diffusion Welding of Aluminum(Materials, Metallurgy & Weldability)

Abstract: The ultrasonic vibration has been applied in the diffusion welding of aluminum in an attempt to break up the superficial oxide film of the bond interface. The ultrasonic vibration and subsequent welding have been carried out in a vacuum of 10-2 Pa at 875 K to 893 K under a welding pressure of 1 to 3 MPa. The bond strength increased with the increase in the input power to the transducer and working time of ultrasonic vibration. The increase in pressure to the bond interface during the vibration, however, lowered the bond strength. TEM observation and electric resistance measurement of the bond interface revealed that the application of ultrasonic vibration had the effect of breaking up and dispersing the oxide film, which was closely related to the increase in bond strength. On the fractured surface of joint, dimple patterns, increased with the rise of bond strength. These portions may be regarded as places where the application of ultrasonic vibration promotes breaking up and dispersing the oxide film.

Wire for gas shielded arc welding of stainless steel

Abstract: PURPOSE:To improve weldability and the quality of a weld metal by specifying the contents of Si and S in a wire compsn. and limiting the contents of Al, Ca, and Mg. CONSTITUTION:The compsn. of the wire for welding is made to contain, weight %, = (SiX0.03%) Al, <=0.005% Ca, <=0.005% Mg and is composed of the balance mainly Fe. N is further added at <=0.50% thereto according to need. A stable arc is obtd. in MIG welding and a good bead shape is obtd. if the wire for gas shielded arc welding of stainless steels having such compsn. is used. The generation of the slag in TIG welding is decreased and the strength and corrosion resistance of the deposited metal are improved.

Joining of silicon nitride using amorphous Cu-Ti filler metal.

Abstract: Si3N4/Si3N4 joint was made using Cu66Ti34, Cu50Ti50 and Cu43Ti57 amorphous filler metals, where pressureless sintered Si3N4 was used. The joining strength of Si3N4 joint was measured by fracture shear testing, and the joining mechanism was investigated by microstructure observation with SEM, and elements analyses at the joint interface with EDX and EPMA. The results obtained are summarized as follows.(1) The molten Cu-Ti alloys containing 20 at% Ti or more exhibit the equilibrium contact angle of about 8°, and are applicable to the filler metal for joining of Si3N4.(2) The joining strength of Si3N4 using Cu66Ti34 filler is higher than that of Si3N4 using other Cu-Ti fillers at any brazing temperature except for brazing temperature of 1273 K. Thus, the joining strength of Si3N4 with Cu66Ti34 filler shows the maximum value of 313.8 MPa at brazing temperature of 1323 K. At the brazing temperature of 1373 K, Si3N4 joint with Cu50Ti50 filler shows the maximum value of 176.5 MPa at brazing time of 1.8 ks, and gradually decreases with longer brazing lime, and to 19.6 MPa at brazing time of 7.2 ks. The elevated temperature fracture shear strength of Si3N4 joint brazed at 1373 K for 1.8 ks using Cu50Ti50 filler increases to 199.1 MPa at 373 K, and gradually decreases to 105.9 MPa at 973 K.(3) During brazing Ti in molten Cu50Ti50 filler reacts with Si3N4 by the following reactions. Si3N4(s) +4Ti(1)=4TiN(s)+3Si(s), and Si3N4(s)+9Ti(1)=4TiN(s)Ti5Si3(s). TiN at the interface between Si3N4 and the filler, Ti5Si3, and Cu-Si phase at the central part of the filler are formed. The activation energy for growth of TiN at the joining interface is 206.3 kJ/mol, and the growth of TiN is dominated by the diffusion of N in TiN. The silicon content of the Cu-Ti phase increases about 7 at%Si to about 20 at%Si with increasing the brazing temperature.

Composite brazing filler metal and brazing method thereof

Abstract: PURPOSE:To execute brazing in a good position by interposing a composite laminated brazing filler metal consisting of >=3 layers formed by sandwiching Au layers with Sn-In alloy sat specific weight ratios in a weld zone and executing brazing of mainly the Sn-In alloy at a specific temp., then heating the weld zone to a specific temp. to diffuse both the brazing filler metals. CONSTITUTION:The composite laminated brazing filler metal of >=3 layers is formed by sandwiching 45-90wt.% Au layers having a high m.p. with 1-60wt.% low melting Sn-In alloy layers. Such brazing filler metal is rolled and is blanked to a prescribed shape. The blanked brazing filler metal is interposed in the weld zone and is heated to 120-180 deg.C above the m.p. of the Sn-In alloy by which the brazing of mainly the Sn-In alloy is executed. The brazing filler metal is then heated up to 220-280 deg.C at which the Sn-In alloy does not flow so much to diffuse the Sn-In alloy and Au so as to enhance the joint strength. Brazing is satisfactorily executed without forming an intermetallic compd. with the weldment and without changing the position. The composite brazing filler metal may also be formed in the superposed shape of >=2 layers with the Au as a center.

Method of brazing corrosion resistant nickel-based thin-walled tubing to stainless steel base members

Abstract: A method of brazing corrosion resistant, nickel-based, thin-walled tubing which includes substantial proportions of nickel, chromium and molybdenum to a stainless steel base member using a filler metal, principally comprising gold as a major constituent and nickel as a minor constituent, in a vacuum furnace without introducing stress corrosion cracks in the brazed tubing and also avoiding carbon precipitation. The brazing is conducted at a temperature of at least about 1900° F. (1038° C.) for a sufficient period of time to allow any carbide precipitation formed during the heating to redissolve and also to permit full, uniform flow of the filler metal. The heated members are rapidly quenched in an inert atmosphere to a temperature at least sufficiently low to avoid carbon precipitation in the tubing.

Coated electrode for arc welding

Abstract: Disclosed is an electrode comprising a base rod and a hard coating, or a base wire which is coated with a powder or metallic coating of aluminum and optionally of hard coating material that adheres to the electrode and forms a partial pressure of arc activated reactive conductive gas agent in the shielding gas envelope surrounding the arc; and further acts as: an inert agent to shield volatile contaminants; a modifier of the shielding gas envelope's electrical properties; and a heat distributor in the area of the weld puddle by condensation in moisture or oil contaminated environment arc welding.

Brazing method utilizing centrifugal force

Abstract: PURPOSE:To braze uniformly a member to be brazed to a cylindrical body over the entire part thereof by inserting together the member to be brazed, flux and brazing filler metal into the cylindricl member and heating and melting the same while rotating the cylindrical body. CONSTITUTION:The brazing member consisting of an Al material is brazed to the inside wall surface of the cylindrical member of which the inside wall surface consists of, for example, an Al material. The surface in the joint part of the brazing member is subjected to a flux treatment and the Al brazing filler matel is inserted together with the treated member into the cylindrical body, then the cylindrical body is fixed by a jig. While the entire part of the cylindrical body is rotated, said body is heated and is held for prescribed time at the temp. higher than the m.p. of the brazing filler metal and lower than the m.p. of the cylindrical body and member. The cylindrical body is thereafter cooled down to the temp. lower than the solidifying point of the brazing filler metal.

Contact tip for arc welding

Abstract: PURPOSE: To drastically extent the service life of a contact chip by forming the inside periphery part of the tip of a through hole of a welding wire at least of the contact chip for the arc welding of conductive ceramics and preventing the spatter fusion on the welding wire and reducing the hole wear. CONSTITUTION: The inside peripheral surface 2 or the whole of the through hole 4 of the welding wire of the contact chip 7 for the arc welding is formed of the conductive ceramics 2 and 2a with about 1300 Kg/mm 2 hardness. The service life of the contact chip 7 is extended remarkably and the welding productivity is improved drastically because of an infusible characteristic for spatters or the wear resistance of the conductive ceramics 2. COPYRIGHT: (C)1988,JPO&Japio

Lead welding process

Abstract: Two lead members are juxtaposed on an electrically conductive surface forming a first electrode. A direct current electric arc is struck between a second electrode and at least one of the lead members. Inert gas is directed at the area being welded and the arc and work are moved relative to each other. The lead members are typically sheet members and the welds may be of the general types of welds formed with other metals. No metal is added in the welding process.

Thin solder strip for brazing

Abstract: PURPOSE: To contrive the corrosion resistance of the joint part of a stainless steel, Ni alloy, etc., by incorporating specific weight % of Cr, Ni, B, and Si, Mn, etc., into a component compsn. and consisting the balance substantially of an Fe component. CONSTITUTION: The component compsn. of a brazing filler metal for joining is composed of ≤1.5% Si, ≤1.0% Mn, 10W40% Cr, ≤50% Ni, 1.0W2.5% B, and further ≤20% Co and ≤20% Mo at need and is composed of the balance substantially of the Fe component. A molten alloy steel contg. such component compsn. is supplied from a holding vessel through an injection nozzle onto the surface of a cooling roll, by which the molten steel is cooled at a prescribed cooling rate and a thin solder strip is obtd. The thin solder strip contains a proper ratio of B. The Ni, Cr, and Si components contribute to the improvement of the corrosion resistance in the joint part and the Si, Co, etc., contribute to the maintenance of the joint strength. The corrosion resistance of the joint part of the alloy steel, etc. is improved by the above-mentioned method. COPYRIGHT: (C)1987,JPO&Japio

Production of vacuum vessel

Abstract: PURPOSE:To intensify the strength of a joint part by interposing an Al brazing material between a stainless steel vessel body provided with a high-purity Ni plating layer at an aperture end and Al material and brazing and joining the same. CONSTITUTION:A flange 3 made of a stainless steel and the Al material 1 are grasped via the brazing material 2 interposed therebetween. Such assembly is heated in a vacuum or inert gaseous atmosphere by which the assembly is brazed and joined. The high-purity Ni layer 31 having >=95% purity is preliminarily formed at 1-50mum thickness at the open end of the vessel body 4. Al-Si-0.2-3% Mg is used as the brazing filler metal for vacuum brazing and Al-Si-Be and Bi are used as the brazing filler metal for brazing in the inert gaseous atmosphere. The joint part obtd. in the above-mentioned manner has the high strength and withstands a high vacuum and is therefore applicable to an electronic tube such as X-ray receiving tube and others.

Method of weld repairing steam turbine rotors

Abstract: Method for effecting weld repairs to a nickel-­ molybdenum-vanadium steel steam turbine rotor. One or more weld passes are made using a filler metal to repair a defect in the rotor. A filler metal alloy is prepared consisting essentially of, by weight, per cent 0.090-1.110 carbon, 1.25-­ 1.80 manganese, up to 0.0010 phosphorus, up to 0.010 sulfur, 0.20-0.50 silicon, 1.40-2.10 nickel, up to 0.30 chromium, 0.25-­ 0.55 molybdenum, up to 0.05 vanadium, up to 0.10 titanium, up to 0.10 zirconium, up to 0.10 aluminum, up to 0.20 copper, up to 0.0015 antimony, up to 0.015 tin, up to 0.020 arsenic, and, up to, in ppm, 35 oxygen, 25 nitrogen, and 10 hydrogen, the balance being iron. This alloy is vacuum induction melted. Preferably this alloy has 0.10-0.25 chromium and a maximum of 0.010 zirconium. Welds using this filler metal exceed the rotor base material in strength, notch toughness, and resist­ ance to temper embrittlement.

Production of spectacles

Abstract: PURPOSE:To perform the resistance welding of a broaching member and rim without spoiling the beauty with melting the projection part by forming the groove to fit a rim to a broaching member, by forming a projection part as well on the groove part and by electrifying the projection part with the pressure welding of electrode to the broach member and rim. CONSTITUTION:A projection part 34 is formed simultaneously by rotary bit 28 with forming the groove part 26 for fitting a rim 36 to broach 22. And the rim 36 and broach 22 are unified with projection welding by the linear projection part 34. It is therefore unnecessary to control the temp. with watching the color of the heated brazing filler metal, nor the beauty is spoiled by the leakage of the excess brazing filler metal. Moreover the product of excellent external appearance can be made by not only enabling to avoid from the accident of welding break away, etc. but also making the finish beautiful with the broach 22 and rim 36 being composed of the pure titanium of the same quality.

Using a corrosion proof austenitic alloy for high load weldable components

Abstract: The present invention relates to the utilization of a corrosion proof austenitic iron-chromium-nickel-nitrogen alloy as structural material for components being subjected to high mechanical loads and being well amenable to welding. Thus the invention provides a method of making and using weldments of a corrosion proof austenitic alloy comprising the step of providing an alloy having the following composition not more than 0.08% carbon, from 0.065 to 0.35% nitrogen; of not more than 0.75% niobium but not more than the 4-fold amount of nitrogen used in the alloy, from 16.0 to 22.5% chromium, from 7.0 to 55.0% nickel, not more than 4.75% manganese, not more than 6.5% molybdenum, not more than 3.0% silicon, not more than 4% copper, not more than 0.008 boron, the remainder being iron and unavoidable impurities; and cold working and recrystallization annealing of said alloy to attain an ultrafine grained structure with an average linear intercept length of grains below 10 micrometers and therefore obtaining increased 0.2% offset yield strength at room and elevated temperatures; and joining of said alloy in its grain-refined state through welding using a high strength, nitrogen containing, corrosion resistant steel or nickel alloy as filler metal and the ultrafine grained alloy as parent metal, which will in spite of its very small grains not fracture in the seam transition region of the weldments.

Production of composite brazing filler metal

Abstract: PURPOSE:To produce a composite brazing filler metal which is suitable for brazing, contains Ti and has high joint strength by plating a chemically stable protective film layer to the surface of a Ti strip then joining superposedly a brazing filler strip thereto and forming a composite-layered strip. CONSTITUTION:The chemically stable protective film layer is provided by a plating method on the surface of the Ti strip. Ag, Au, Pd, Pt or the like which forms hardly an oxide film, is chemically stable and permits easy joining is used as the above-mentioned protective film layer and is preferably formed to 2-10mu thickness. The clean brazing filler strip having a smooth surface is thereafter superposed on the above-mentioned Ti strip and is joined by a hot rolling method, etc. The joining is preferably executed in an inert atmosphere of nitrogen, etc. The composite brazing filler metal obtd. by the above- mentioned method is thereafter subject to cold rolling and annealing to a desired sheet thickness. The satisfactory brazing of ceramics, etc. by making use of the active Ti is made possible.

Multi-layer laser welding method

Abstract: PURPOSE:To enable the multi-layer welding of thick plates and to improve welding efficiency by controlling the focal length of a lens and melting filler metals and base metals by a laser beam. CONSTITUTION:The base metals 6, 7 are disposed to have a gap 0 and a groove having 1/6H width is formed in the upper part thereof. A focal position 11a is set at the point right under the base of the groove and the root pass of the gap zero part is executed by the filler metal 9a, etc. in the 1st pass 10a. The focal position 11b is set at the point right under the surface of the filler metal 9b and the groove part is welded by penetrating thoroughly the filler metal 9b and the base metal 6 in the 2nd pass 10b. The focal position 11c is set at the point right under the filler metal 9c and the filler metal 9c and the base metal 7 are penetrated to fuse thoroughly the remaining lack of penetration part of the 2nd pass 10b in the 3rd pass 10c. A substantial reinforcement of weld shape is formed similarly in the 4th pass 10d. The defectless multi-layer welding of the thick plates is made possible and the welding efficiency is improved by the above-mentioned method.

Plasma arc low-temperature brazing device

Abstract: PURPOSE:To braze satisfactorily and quickly proximity brazing parts with less thermal influence to the other parts by using a plasma arc generator, heating a heating element by a plasma arc with the heating element as an anode and heating indirectly the proximity brazing parts by the radiation heat thereof. CONSTITUTION:The heating element 11 facing a torch 1 of the plasma arc generator as the anode is heated by the arc 15. The heating element 11 is heated quickly and a proximity brazing filler metal 10 and brazing parts 12, 13 are quickly heated by the radiation heat thereof without scattering, by which said parts are satisfactorily brazed. The brazing is made satisfactory with the decreased inconvenience owing to the local quick heating by the plasma arc and the decreased thermal influence to the other parts.

Quality Control in Aluminum Arc Welding

Abstract: Quality control in welding is the responsibility of everyone involved in welded fabrication—from the selection of the proper aluminum alloys and forms of welding, to proper metal storage, selection of the joint design and method of edge preparation, selection of the welding process, equipment and filler alloy, establishment of the welding procedure, adequate training of personnel and supervision involved with the welding operations as well as the final weld inspection. Too much emphasis cannot be placed on making a satisfactory weld since repair welding is expensive.

Method and apparatus for a surface-improving treatment of body of an alloy having a readily oxidizable surface-impairing component

Abstract: A rotary wire brush is used to transfer nickel, copper or brazing filler metal, like gold and silver from a slab of metal to the surface of a workpiece. The brush cleans the metal workpiece to expose a metal surface freshly and rubs metal of the metal slab for quick transfer for the freshly exposed metal surface of the workpiece where it sticks to build up a layer between one and one hundred microns thick in somewhere between one and two minutes. Metal slab and workpiece are both pressed against the brush, but the workpiece is not pressed enough to score the workpiece. The surface of the workpiece coated in this way can then be joined to another workpiece surface thus coated in a fluxless brazing or soldering process in which the temperature does not need to be higher than 1000° C.

Heat transmission part for heat exchanger and production

Abstract: PURPOSE:To improve the boiling heat transfer rate of a heat exchanger by imposing a mixture composed of fie metallic particles and Mg-contg. Al brazing filler metal particles onto a base plate made of Al and heating the same up to the brazing temp. in a non-oxidizing atmosphere. CONSTITUTION:The mixture composed of the fine particles of the Al alloy and the particles of the Al brazing filler metal 2 contg. Mg is imposed on the Al base plate 3 constituting the heat transmission part of the heat exchanger and is heated to the temp. right above the melting point of the brazing filler metal 2 in the non-oxidizing atmosphere. The evaporation of Mg arises before and after melting of the metal 2 and therefore the surfaces of the particles of the alloy 1 and the base plate 3 are reduced and the oxide films are removed therefrom. The molten metal 2 wets the surface of the alloy 1 particles and the plate 3 by surface tension and solidifies on cooling. The porous layer of the alloy 1 is thus formed on the plate 3. The remarkable improvement of the boiling heat transfer rate of the heat exchanger is thus made possible.

Method of making a nickle high-chromium base brazing filler metal

Abstract: A nickel based high melting point, homogeneous, ductile brazing foil composition consists essentially of about 17 to 20 atom percent chromium, about 4 to 10 atom percent boron, about 10 to 16 atom percent silicon, the balance being nickel and incidental impurities. The composition is such that the total of nickel and chromium ranges from about 74 to 84 atom percent.

Production of ag brazing and sealing ring

Abstract: PURPOSE:To obtain an Ag brazing and sealing ring without generating a scrap by overlapping the Ag brazing ring that a Ag-Cu alloy wire is bent and the angular shaped ring of Fe-Ni alloy and by heating and melting inside a carbon jig. CONSTITUTION:An Ag brazing wire 11 adding Sn, In, Bi, Sb, Ga, etc. to an Ag- Cu alloy is wound around a stainless steel square bar 10 and made a square shaped coil 12 with the heating and cooling in hydrogenous atmosphere, and separated Ag brazing ring 13 is joined. The square shaped ring 14 punched out of a Fe-Ni or Fe-Ni-Co alloy plate is then inserted into the square groove 16 of a carbon jig 17 to overlap the ring 13 and an Ag brazing and sealing ring 18 is obtained with heating to the melting point or more of Ag brazing filler metal in the non-oxidizing atmosphere. The Ag brazing and sealing ring is thus obtainable without generating a scrap. The sealing ring thereof is used for the cap sealing of the ceramic container for integration circuit.