Showing papers on "Filler metal published in 1987"

Pulsed arc welding

Abstract: A pulsed arc welding system includes a current pulse generating circuit and a background current generating circuit. The lowest arc voltage across the arc load is detected during a predetermined time period immediately preceeding the onset of each current pulse. The pulse repetition rate is controlled on the basis of this detected voltage so that the detected arc voltage becomes constant.

Method of welding

Abstract: Virgin metal and metal alloy components are welded with and without filler material using a laser without cleaning the surfaces to be joined of mill scale and/or surface oxides, paints grease and other forms of contamination, and without edge preparation. The uncleaned, unprepared surfaces are placed in contact with each other, and a 100% through the thickness laser keyhole weld without filler metal is made in one pass, full penetration is achieved by two laser keyhole welds without filler metal (one made from each side), or resistively heated filler wire is fed into the metal pool of a laser conduction weld in one or more passes along each side of the confronting surfaces to be joined. Quality welds are made despite gaps of varying size up to about 0.125 inches between the parts to be joined.

Method for controlling gas metal arc welding

Abstract: The heat input and mass input in a Gas Metal Arc welding process are controlled by a method that comprises calculating appropriate values for weld speed, filler wire feed rate and an expected value for the welding current by algorithmic function means, applying such values for weld speed and filler wire feed rate to the welding process, measuring the welding current, comparing the measured current to the calculated current, using said comparison to calculate corrections for the weld speed and filler wire feed rate, and applying corrections.

Brazing filler metal

Abstract: PURPOSE:To form a brazed product having good quality by using an alloy contg. Au, B, Cr, Si, and Pd respectively at specific ratios and consisting of the balance Ni as a brazing filler metal. CONSTITUTION:The compsn. of the brazing filler metal consists, by weight, 1-30% Au, 0.5-5% B, 0.5-15% Cr, 0.5-10% Si, 1-30% Pd and the balance Ni. At least either one kind of Fe and Co is incorporated at 0.5-7% into the above-mentioned components according to need. An alumina crucible is used to melt the brazing filler metal and a thin sheet thereof is prepd. by melting the brazing filler metal in a gaseous Ar atmosphere by high-frequency induction heating and pouring the melt onto single roll. Such thin sheet is brazed to a nickel alloy, stainless steel, etc. in a gaseous Ar atmosphere. The brazing filler metal is formed by discharging the melt thereof to a rotating fluid or injecting the same by water or an inert gas. The product which has a high degree of joining, is highly resistant to heat and corrosion and has shallow penetration depth of oxidation is obtd. by such brazing filler metal.

Method of producing an aluminum heat exchanger

Abstract: A method of producing an aluminum or aluminum alloy heat exchanger which involves the use of an aluminum-silicon alloy brazing filler metal element bearing zinc. During brazing, a diffused zinc layer is formed on the surface of the brazed connection and on the surface of the heat exchanger core in the vicinity thereof to protect the heat exchanger against corrosion.

Joining Joining of silicon nitride with Al-Cu alloys

Abstract: The sessiie drop technique was used to evaluate the equilibrium contact angle and work of adhesion of molten Al-Cu alloys on Si3N4 at 1373 K under vacuum. The wettability of Al-Cu alloys on Si3N4 is improved by an addition of copper content up to 20 at%. The joining of Si3N4 to Si3Ni4 was also conducted using Al-Cu filler metal at a brazing condition of 1373 K for 3.8 ksec. The dependence of strength of the Si3N4 joint against the copper content in the filler corresponds to the copper content dependence of work of adhesion for molten Al-Cu alloy on Si3N4. The superior wettability and mechanical property of filler provide the superior strength of Si3N4 brazed with the filler. In particular, the Si3N4 joint brazed with Al-1.7 at% Cu filler exhibits the maximum fracture shear strength of 188.3 MPa at room temperature. This superior strength of Si3N4 brazed with Al-1.7 at% Cu filler is maintained at elevated temperatures up to 850 K.

The Weldability of an Al-Li-Cu Alloy

Abstract: The development of low-density aluminum-lithium alloys for aerospace applications provides industry with an attractive alternative to fiber-reinforced composites for reducing weight while maintaining the fabrication cost advantages of aluminum. In this study, gas metal arc (GMA), gas tungsten arc (GTA), and electron beam (EB) welding processes were used to evaluate the potential fusion weld-ability of alloy 2090 (Al-2.2 Li-2.7 Cu-0.12 Zr). The results indicate that, with proper filler alloy selection, 2090 may be easily welded with a low sensitivity to weld solidification cracking. The weld porosity of 2090, the source of which is hydrogen enriched surface oxides, may be eliminated by chemically or mechanically milling the surface prior to welding. The dominant modification in the heat-affected zone of 2090 weldments is dissolution of strengthening phases. This degradation is reduced by the use of high energy density heat sources, such as an electron beam, or post-weld thermal treatments.

Control of deposition rates in hot wire TIG welding

Abstract: (1987). Control of deposition rates in hot wire TIG welding. Welding International: Vol. 1, No. 8, pp. 736-742.

Brazing sheet made of aluminum

Abstract: PURPOSE:To greatly improve the strength and pitting corrosion resistance after brazing so that the weight of a heat exchanger for automobiles can be reduced by using a specific Al alloy as a core material and cladding an Al alloy brazing filler metal to both or one face thereof. CONSTITUTION:The alloy having the compsn. contg., by weight, 0.5-1.0% Si, <=0.2% Fe, 0.5-1.0% Cu, 0.5-1.5% Mn, 0.1-0.5% Mg, and the balance Al is adjusted to 40-400mum crystal grain sizes and is used as the core material. The Al alloy brazing filler metal is superposed on both or one face thereof and the material is hot rolled at a specified temp. by which said material is clad on the core material. As a result, the brazing sheet exhibits the high strength adequete for brazing the heat exchanger made of the Al alloy and is improved in the brazing property and the pitting corrosion resistance. The weight of the heat exchanger is thus reduced.

Method of welding involving weld bead shaping and arc deflection and apparatus for practicing said method

Abstract: A method and apparatus for welding involving directing a high velocity stream of gas at an angle to a welding arc in the direction of travel of the welding arc and onto the molten pool of metal formed by the arc as the molten pool solidifies, and a method and apparatus for injecting particles into the molten pool just prior to its solidification concurrently with the flow of high velocity gas.

Short-circuiting arc welding process

Abstract: The method of controlling the welding operation in short-circuiting arc welding with regularly alternating arc-burning phase and short-circuiting phase, with which not only is the formation of spatter eliminated to the greatest possible extent and a sound weld obtained and the noise during welding reduced but the energy consumption is also significantly reduced, is constituted in such a way that the actual welding current and the actual welding voltage are continuously detected and the instantaneous welding power is calculated The welding current and/or the welding voltage is then reduced in a controlled manner to such an extent that the instantaneous welding power does not exceed a predetermined maximum value

Low melting point cu-ag alloy brazing filler metal having good wettability

Abstract: PURPOSE:To improve wettability and to stabilize the performance of a brazed part for a long period of time by incorporating a specific ratio each of Ag, Pd and Si and a specific ratio of 1 or 2 kinds of B and Li into a brazing filler metal. CONSTITUTION:The Cu-Ag alloy brazing filler metal contg. 25-65% Ag, 0.5-25% Pd, 0.25-6.5% Si and 0.01-0.8% 1 or 2 kinds of B and Li ad consisting of the balance unavoidable impurities is produced by applying an ordinary melting method and plastic working method. The Cu-Ag alloy brazing filler metal obtd. in such a manner has a low vapor pressure and low m.p. and exhibits good wettability in the stage of brazing; in addition, said metal obviates the generation of the base metal crack arising from the intrusion of solder. The performance of the brazed part is thus stably assured for a long period of time.

Gold brazing alloy

Abstract: PURPOSE:To improve brazing strength and to prevent the contamination in a furnace by adding at least one kind of In, Sn and Ga at prescribed % to respectively specific weight % of Au, Ag and Cu elements. CONSTITUTION:Au, Ag and Cu are incorporated as basic elements into a gold alloy and the contents thereof are specified to 35-75wt.% Au, 5-40% Ag and 10-30% Cu. The gold brazing alloy is formed by further adding at least one kind of In, Sn and Ga in place of Cd and Zn components thereto. The contents of the respective elements are limited to 0.5-10% In, 0.5-10% Sn and 0.5-10% Ga at this time. Au acts as the basic element and Ag and Cu improve the flowability and brazing strength of a brazing filler metal. In, Sn and Ga lower the m. p. of the alloy and improve the flowability. The brazing strength is, therefore, improved and since Cd and Zn are not incorporated into the alloy, the contamination in the furnace is prevented.

Welding method which provides a weld with corrosion protection

Abstract: A welding method for metal parts includes preparing the surface areas of the parts to be welded to provide bare metal surfaces which are clean and dry, clamping said parts together, coating the bare metal surface with a liquid coating comprised of zinc dust, manganomanganic oxide fume, and organic binder, permitting the coating to dry, and welding the coated surfaces together by gas metal arc welding.

Filler metal for tig welding

Abstract: PURPOSE: To obtain filler metal with the satisfactory separating property of slag by allowing to contain the specific quantity of TiO 2 , CaF 2 , AlF 3 , Mn and Ti in a wire formed of the stainless steel skin and further, filling flux with a specific value of a simple substance or a compound of Bi therein CONSTITUTION: The titled TIG welding filler metal uses a pipe or band steel as the skin and indicates the wire having a wire cross section such as a shape where the edge of the band steel is tucked in the inside, a shape where the end faces are butted to each other, etc, and the filling flux 8 is filled in the inside of the skin 7 which is formed tubularly from the pipe or the band steel of the stainless steel The filling flux 8 contains, by weight, 3W12% TiO 2 , 005W5% AlF 3 , 05W25% Mn and 005W15% Ti and further, the total of the simple substance or the compound of B"i contains 0001W05% expressed in terms of Bi A satisfactory root pass reverse side beam is obtained in the TIG one-side welding of the stainless steels by a synergetic effect of these elements COPYRIGHT: (C)1988,JPO&Japio

Method pertaining to the explosion welding of very thin metal layers

Abstract: A method of explosion welding very thin plastic foil to a thicker base material. By fastening a soft material of low acoustic velocity in position on the metal foil prior to carrying out a welding operation, the pressure differences which prevail in the pressure wave incident on the metal foil are equalized in a manner to maintain a uniform pressure wave during the welding sequence. The inventive method enables the explosion welding of thin metal layers having a thickness as low as some few microns.

Joining method for aluminum and steel material

Abstract: PURPOSE:To join an aluminum material and steel material with strong strength by brazing the aluminum coated joining part of a steel material and the joining part of the aluminum material by using an aluminum base brazing filler metal and flux. CONSTITUTION:In case of joining the aluminum material of an aluminum alloy pipe, etc. and the steel material of a steel pipe, etc., an aluminum plating is made on the joining part at least of the above steel material side. The above aluminum plating is preferably by the hot dipped aluminum coating using an pure aluminum alloy. The aluminum coated joining part of the above steel material and the joining part of the aluminum material are then brazed by using the aluminum base brazing filler metal of Al-Si, etc., and a flux. As for the above flux, a fluorine flux is suitable. In this way the product with good joining operability and good corrosion resistance on the joining part and high reliability in the joining strength and airtightness as well is obtd.

Magnetic control device for arc welding

Abstract: PCT No. PCT/EP85/00506 Sec. 371 Date Jul. 10, 1986 Sec. 102(e) Date Jul. 10, 1986 PCT Filed Oct. 1, 1985 PCT Pub. No. WO86/02028 PCT Pub. Date Apr. 10, 1986.The invention relates to a device for welding of metallic parts with tubular cross section with an electric arc, having at least two magnets with the same polarity, surrounding the weld seam line annularly with their pole faces. In such a welding device, the pole faces are easily contaminated with weld splashes, during welding. Such contamination has a negative influence on the electric arc path and the weld seam line is deteriorated. In order to avoid such contamination, the invention proposes that the pole faces (4) be provided each with a covering protection ring (5), presenting an inner surface (7) inclined towards the weld seam line.

Submerged arc welding method for stainless steel

Abstract: PURPOSE: To obtain weld metal with stable quality by forming an electrode of a flux-cored wire filled with alloy content metal, a deoxidizer and a metallic nitride at the specific rate and using melt flux to perform submerged arc welding of stainless steel. CONSTITUTION: Powdery materials consisting of ≥1 kind of Ni, Cr, Mo and Mn, ≥1 kind of, by weight, 0.5W15% Al, Si, Mg and Ca-Si, 0.5W5% N-Cr and/or 0.5W10% N-Mn and the balance of inevitable impurities are granulated and adjusted by a caking agent. These granules are dried and subsequently, filled in inside space of a tubular wire of stainless steel. The flux-cored wires obtained by this method are arranged to a first electrode and first and second electrodes for welding with two electrodes and welding with more than three electrodes respectively in the multiple electrode submerged arc welding method for the stainless steel. Stainless steel solid wires are arranged to the other electrodes. Further, the melt flux is used to perform the titled welding. COPYRIGHT: (C)1989,JPO&Japio

Ultrasonic Wire Bonding Using a Complex Vibration Welding Tip

Abstract: Ultrasonic wire bonding using a complex vibration welding tip is proposed and studied to improve welding characteristics of ultrasonic wire bonding of thin various metal wires. The welding system designed consists of a complex transverse vibration rod driven by a 40 kHz and a 60 kHz ultrasonic longitudinal vibration systems. These vibration systems are driven simultaneously by independent vibration controllers and amplifiers. Welding specimens used are 0.05 mm to 0.15 mm diameter aluminum wires and 1.0 mm thick copper plates. These welding specimens are welded successfully by the complex vibration welding equipment. And also, using this method, the weld strength of wire bonding becomes independent to the direction difference between welding tip vibration and wire length.

Aluminum brazing sheet

Abstract: PURPOSE:To provide a brazing sheet having high strength and excellent brazability by using an Al alloy contg. Mg as a core material and providing Al or Al alloy to prevent the diffusion of Mg and Si between the core material and brazing filler metal. CONSTITUTION:The brazing sheet 6 is prepd. by cladding the brazing filler metals 8 via the Si and Mg diffusion preventive layers 10a to both faces of the core material 7. The brazing sheet 6 is erected on a substrate 9, etc., and is brazed by an NB method, etc. The brazing filler metal 8 is clad via the Si and Mg diffusion preventive layer 10a on one face of the core material 7 and the Mg diffusion preventive layer is provided to the face which is not clad with the brazing filler metal 8. The high strength, excellent brazability and good paintability are assured by such brazing sheet. An industrial effect to permit the thickness reduction of the brazing sheet or the like is thus expected.

Resistance diffusing junction method

Abstract: PURPOSE:To discharge an excess solder, to diffuse sufficiently as a thin film-like liquid phase and to enable a storing joining by using a specific brazing filler metal having high diffusivity, melting only the brazing filler metal by resistance heating and pressing simultaneously. CONSTITUTION:The brazing filler metal 1 contg. the element of high diffusivity of Si, B, P, Cr, etc., is interposed between joining materials A and B and the electrode 2 for electrifying and pressing is respectively abutted to the joining material A and the other end side. A resistance heating current is fed from an electrifying power source 3 to the electrifying and pressuring electrode 2 to energize a pressing force from a pressurizing mechanism 4. At this time, the brazing filler metal part is concentrically pressurized and melted. The melted brazing filler metal is immediately discharged by pressurizing, a thin film like liquid phase is formed on the joining part, the component of high diffusivity in the solder is diffused on the joining face and the m.p. of the liquid face rises simultaneously, hence the solder of the specified temp. is solidified and joined.

Base treatment method in melt joining

Abstract: PURPOSE: To join the objective material for melt joining in a high strength by projecting the granular body consisting of zinc, Al or those alloys on the outer surface by executing a base treatment on the surface of a base steel stock. CONSTITUTION: In case of joining a dissimilar material by melting it to a steel the granular body consisting of zinc, Al or those alloys at its outer surface at least is projected on the surface of a base steel stock as the base treatment or after forming the plating layer of those metals a blast treatment is executed on this plating layer. The brazing filler metal in a molten state is thus well wetted to the surface in brazing and the solidified brazing filler metal is joined with high strength by the anchor effect and fastner effect for the surface. Similarly in diffused joining an insert metal is well wetted to the surface, the joining objective material of a ceramic, etc., itself in thermal spraying as well respectively and they are strongly joined by showing anchor effect and fastener effect. COPYRIGHT: (C)1989,JPO&Japio

Lap resistance welding method for al material to fe material

Abstract: PURPOSE: To obtain a welded joint part with high strength and high ductility by using a second insert material such as Al brazing filler metal, etc., in addition to a first insert material such as an aluminized steel plate, etc. CONSTITUTION: The first insert material 7 and the second insert material 8 are interposed between a steel 5 such as carbon steel or stainless steel, etc., and an Al material 6 made of Al or an Al alloy. There are the aluminized steel plate forming Al or Al alloy (including the Al brazing filler metal) layers on both sides of a steel plate and the aluminized steel plate forming an Al or Al alloy layer on one side of a steel plate as the first insert material 7. Further, there are the Al brazing filler material of an Al solder simple substance, an Al brazing sheet cladding Al solder on both sides of an Al alloy plate and an Al brazing sheet forming Al solder on one side of an Al alloy plate as the second insert material 8. The first insert material 7 and the second insert material 8 are interposed so that these are arranged at the steel 5 side and the Al material 6 side respectively. COPYRIGHT: (C)1988,JPO&Japio

Manufacture of al clad steel plate

Abstract: PURPOSE: To manufacture a clad steel plate by a simple stage without spoiling the joining property by interposing a Zn or Zn alloy layer on a steel plate to superpose an Al plate thereon and heating and melting these under proper conditions. CONSTITUTION: The interposing layer made of Zn or a Zn alloy is provided as brazing filler metal on the top of the steel plate and the Al plate is set up thereon. These are heated above the melting temperature of the Zn or Zn alloy and below the melting temperature of Al and cooled after the interposing layer is formed to liquid phase in a vacuum or in a nonoxidizing atmosphere. The interposing layer is molten and joined with both Al plate and steel plate and the Al cladding steel plate is obtained. The continuous mass production of the clad steel can be carried out by the simple stage with little pre-working and after-working. COPYRIGHT: (C)1989,JPO&Japio

Brazing method for conductor terminal

Abstract: PURPOSE:To execute brazing of a conductor terminal of a high strength and a high heat resistance by placing a brazing filler metal on a joint part of one conductor coil, heating it and forming an alloy layer and a brazing filler metal on the interface and the surface, respectively, and thereafter, inserting it between conductor terminals of the other side, which have been brought to U-shaped working, and heating and pressing it between a pair of electrodes. CONSTITUTION:Preliminary soldering 2 is performed to a joint part of a conductor coil 1 being a material to be joined, a joint part of the other conductor terminal 3 is brought to U-shaped working 4, and said coil 1 is combined with this part. That is to say, a cross section of said joint part is combined with electrodes 5, 5 of an electric conduction heating and pressure device, and thereafter, the preliminary solding 2 is performed by electric conduction heating, and an alloy layer 6, and an unreacting solder layer 7 are formed continuously between the coil 1 and solder, and on the upper layer part of the alloy layer 6, respectively. Subsequently, electric conduction working is executed through the electrodes 5, 5, and a thin alloy layer 8 is formed between the terminal 3 and a solder material 7. Thereafter, the electric conduction heating is further continued and by applying the pressure, unreacting solder 10 is joined and discharged, and the coil 1 and the terminal 3 are joined by each alloy layer 9.

Gold alloy filler metal

Abstract: PURPOSE:To lower a liquid phase temp. and to enable brazing at a low temp. by specifying the contents of Ag, Cu, Zn, Ga, and Sn in a gold alloy filler metal. CONSTITUTION:The component compsn. of the gold alloy filler metal is specified, by weight %, to 35-60wt.% Au, 8-35% Ag, 10-30% Cu, 5-15% Zn, 0.5-10% Ga, and 0.5-10% Sn. The reason for limiting the component compsn. is to confine Au to a 35-60wt.% range in order to obtain K9-K14 gold alloy filler metal. Ag contributes to an improvement in flowability and brazing strength. There is no effect at <8wt.% and the increase of the m.p. is high when the content exceeds 35wt.%. Zn lowers the m.p. of the gold alloy filler metal and improves the flowability thereof. The effect of lowering the m.p. is low at <5wt.% and the brazing strength is degraded if the content exceeds 15wt.%. Ga; Sn lower the m.p. of the gold alloy filler metal and improve the flowability thereof. There is no effect at <0.5wt.% and the embrittlement increases to degrade the strength when the content exceeds 10wt.%. 0.5-10% In is incorporated into this gold alloy filler metal at need.