Showing papers on "Filler metal published in 1984"

Hot-wire TIG welding apparatus

Abstract: A hot wire TIG welding apparatus has a current detector for detecting the peak period and base period of the arc current. The welding apparatus further has a controller which controls, in response to the detection signal from the current detector, the operation of the wire heating power supply such that the wire heating power is supplied only during the base period of the arc current. According to this arrangement, a hot wire switching TIG welding apparatus can be produced using commercially available power supply systems for TIG arc welders, without requiring substantial change or modification of the control circuits in the TIG arc welders.

Partially consumable spacer chill rings and their use in welding pipe joints

Abstract: A partially consumable spacer chill or welding ring includes a generally cylindrical non-consumable base metal ring having an outside diameter of such a size as to snugly fit the inside diameter of the pipe end to be welded. A circular consumable filler metal spacer ring is medially attached to the outer periphery of the base metal ring and extends peripherally radially outwardly to function as a spacing device between adjacent ends of two lengths of pipe to be joined. The consumable spacer ring may be affixed to the base metal ring in a plurality of circularly offset locations by spot welding or may be press-fitted in an alignment groove in the base ring. The consumable spacer ring becomes filler metal during welding.

Structure of Vacuum Brazed BNi-5 Joint of Inconel 718

Abstract: Structural investigations of the brazed joint of Inconel 718 with BNi-5 filler metal were carried out on specimens with geometries simulating a real joint. Three identification methods applied in parallel were used. Fused and solidified filler metal showed the presence of at least four microstructural components: the dominant γ-solid solution, two binary eutectics (G phase + γ) and (θ-phase + γ@#@), and prismatic objects identified as cr-phase. The influence of brazing time and temperature was studied with specimens heated in accordance with three different thermal regimes. The Ni-base γ-phase solidifies in dendritic form and contains Cr, Fe, Nb, and Mo, the concentrations of which are dependent on the thermal regime and on the distance from the former liquid-solid interface. The intermetallics (G, 0) and the matrix form binary and ternary eutectics. In overheated brazed joints the filler metal penetrates into the grain boundaries of the base metal, resulting in the formation of new phases. The dominant phase was identified as a hexagonal Laves phase (λ,). The diffusion zone in the base metal can be divided into two subregions. In subregion I the precipitating phase is a Nb-rich G-phase, while in subregion II, the depth of which can be directly related to the width of the gap, preferentially oriented carbides of Nb and Ti are formed. The phase formation in the BNi-5 brazing of Inconel 718 may be described by a quasi-quarternary diagram on the Ni-Cr-Nb-Si system.

Laser welding method and apparatus

Abstract: A laser welding method and apparatus for welding stacked coated members (1. 2 1 in which voids in the welds are positively eliminated. A spacer (14) is disposed between the two members (1, 2) to be welded. This provides a path (16) for discharging gas formed by heating the coating matenal. The method and apparatus of the invention are useful for the laser welding of base members coated with metals having a lower melting point than the metal of the base, paints and oils. Preferably, the width of the gap is in a range of 0.1 mm to 0.5 mm.

Al alloy brazing sheet

Abstract: PURPOSE:To provide a vacuum brazing sheet for an Al alloy heat exchanger having excellent corrosion resistance by using an Al alloy contg. Cu, Mn, etc. as a core material and cladding an Al alloy brazing filler metal. CONSTITUTION:The Al alloy material formed by using the Al alloy contg. 0.25-1.0wt% Cu, 0.3-1.5wt% Mn, =1 kinds of any among <0.3wt% Mg, <0.3wt% Cr and <0.3wt% Zr as the core material and cladding on one or both surface thereof is used as the Al alloy material which can be brazed in a vacuum without using a flux, unlike in the conventional practice, in the stage of producing the Al alloy heat exchanger. The Al alloy brazing sheet having the improved corrosion resistance is obtd. without spoiling formability and brazability.

Build-up welding method

Abstract: PURPOSE:To perform uniform and stable build-up welding with good working efficiency, by scanning a flat beltlike filler metal on a base material longitudinally by reflected laser light while scanning continuously said metal back and forth in the transverse direction thereby melting the filler metal. CONSTITUTION:Laser light 7 is oscillated by a laser oscillator 6, and is cast onto an electromagnetic oscillating mirror 9 through a lens 8. The mirror 8 is oscillated at a prescribed angle as shown by an arrow 11 to cast the laser light 7 to a stationary mirror 10 at the width equal to the width of a filler metal 4. Then, the laser light 7 reflected by the mirror 10 scans the filler metal 4 at the width 12 equal to the width of the metal 4 and melts the filler metal thereby forming a molten pool 13 on the material 1. Here, the material 1 is moved in an arrow 3 direction at a specified speed by transfer rolls 2, 2 and the metal 4 is supplied to the pool 13 by feed rolls 5, 5-, whereby a smooth and continuous build-up part 14 is formed on the material 1.

Clad brazing filler metal for joining ceramics and metal or the like and composite body composed of ceramics and metal or the like using said brazing filler metal

Abstract: PURPOSE:To provide a titled brazing filler metal which can join materials having considerably different coeffts. of thermal expansion with a simple heating operation by uniting adjacently an Ag layer, Cu layer, Ag-Cu alloy layer, Ag layer and Cu layer, etc. and Ti layer to one body and specifying the content of Ti. CONSTITUTION:A brazing filler metal consists of an Ag layer, Cu layer or Ag-Cu alloy layer or an Ag layer and Cu layer and a Ti layer adjacent thereto and contains the Ti specified to 3-80wt% by th total weight of said layers and is used for joining ceramics and a metal, etc. by heating in a non-oxidizing atmosphere, by which the composite body composed thereof can be formed. One or both of a metal layer having a low coefft. of expansion such as W, ''Kovar'' or the like and a metal layer having a low Young's modulus such as Cu, Ag or the like are adjacently united to the above-mentioned brazing filler metal layer and the metal is used as a clad brazing filler metal for joining, then the residual stress or strain to be applied on the composite material obtd. by joining with said material and cooling is decreased.

Method of brazing with nickel based alloy

Abstract: A nickel based metal alloy consists essentially of about 25 to 35 atom percent palladium and about 15 to 20 atom percent silicon the balance being essentially nickel and incidental impurities. The alloy is especially suited for use as a filler metal in joining steels and superalloys at temperatures less than 1000° C.

The Nitrogen Absorption of Stainless Steel Weld Metal by Gas Tungsten Arc Welding

Abstract: Using an arc atmosphere controlling chamber, effects of the welding conditions and atmosphere on the nitrogen content of the stainless steel weld metal by gas tungsten arc welding were investigated in comparison with those on the iron weld metal. The results are as follows:(1) The temperatures of stainless steel and iron molten pools were measured as about 1530°C and 1630°C, respectively.(2) The nitrogen content of stainless steel weld metal decreased with increasing the welding current, as well as that of iron weld metal.(3) The nitrogen content of stainless steel weld metal hardly depended on the arc length, as well as that of iron weld metal.(4) The nitrogen content of stainless steel weld metal increased with increasing the travel speed, while that of iron weld metal hardly depended on the travel speed.(5) The nitrogen content of stainless steel weld metal increased with the nitrogen partial pressure at low nitrogen partial pressure region, and was constant at the nitrogen partial pressure region above 0.2 atm in N2-Ar gas mixture atmosphere, as well as that of iron weld metal.(6) The nitrogen absorption by stainless steel weld metal was discussed with equilibrium data.

Method and device for welding plastically deformable materials

Abstract: The welding speed of plastically deformable materials when using high power density energy sources, for example a focused laser beam (34) is limited by the formation of defects (cracks, shrinkage cavities, pinholes etc.) in the welding or closed to the latter (butt-joint 11). In order to increase the welding speed while avoiding those defects, the present invention proposes the deformation of the welding (butt-joint welding 11) and the neighbouring areas of the metal sheets (14, respectively 15) so as to press the melted mass formed for the welding and provided by the welding seam, to avoid shrinkage cavities as well as pinholes and to prevent welding strains by plastic deformation in the butt-joint welding area (11). Simultaneously to the deformation of the butt-joint welding (11), it is possible to proceed to its smoothing.

Material for brazing

Abstract: PURPOSE:To prevent deterioration of insulation resistance due to rust and improve strength of brazing by mixing limited quantity of germanium and platinum to silver. CONSTITUTION:The material for brazing is made by adding 0.05-10wt% germanium and 0.2-5wt% platinum to silver. Germanium lowers range of using temperature of brazing filler metal and prevents migration of silver, a principal component of the brazing filler metal. When the content is less than 0.05wt%, above-mentioned property is not given, and when it is more than 5wt%, strength of brazing lowers. Platinum is a component that improves wetting property. However, when the content is less than 0.2wt%, above-mentioned property is not given, and when it is more than 5wt%, effect of preventing migration of silver of germanium is deteriorated.

Improvement of fatigue strength in welded joint part

Abstract: PURPOSE:To improve easily and inexpensively the fatigue strength in a welded joint part in a short time by heating and remelting the surface layer of a weld bead by a heat source of a non-consumable electrode type and shaping the surface shape thereof then cooling the same. CONSTITUTION:A TIG welding torch 7 connecting to a power source 11 for welding and an inert gas source 12 is prepd. as a heat source in a welded Tee joint formed by joining base metals 1, 1 with a weld bead 2. Inert gas 10 is released from the tip 9 of the torch 7 and an arc is generated between a tungsten electrode 8 and the surface 2a of the weld bead in the atmosphere of said gas. The surface 2a of the weld bead is heated by the heat of said arc by which the surface layer 2b is remelted to flow by itself, and is shaped to a smooth surface condition 2c when cooled and solidified. An undercut 5 and crater (not shown) are buried to improve fatigue strength simultaneously with shaping in this case. It is effective to mix said layer with the surface layer 2b remelted with a suitable filler metal for added improvement of the fatigue strength.

An Evaluation of Austenitic Fe-Mn-Ni Weld Metal for Dissimilar Metal Welding A Fe-Mn-Ni alloy system shows promise as a low cost substitute for Fe-Cr-Ni filler metals

Abstract: The Fe-Mn-Ni alloy system has been examined as a potential austen­ itic filler metal substitute for the traditional Fe-Cr-Ni alloys. Microstructure, thermal expansion behavior, and mechanical properties of Fe-Mn-Ni weld metal at two chromium levels (1.2 and 9 wt-%) have been evaluated. A general equation for weld metal austenite phase stability, which accom­ modates the apparent complex concen­ tration dependency of manganese, nick­ el, and chromium, has been developed. This equation is offered as an alternative to the Schaeffler equivalent equations for the austenite-martensite transformation side of the Schaeffler diagram.

Joining method of ni base heat resistant alloy

Abstract: PURPOSE:To perform liquid phase joining having high heat resistance and strength in a joint part by forming a boride layer on the surface in the joint part of an Ni base heat resistant alloy contg. a specific amt. of Cr, Fe, Co as well as Ti, Al then heating the same under press-contact. CONSTITUTION:The surface in the joint part of one or both of materials to be joined is subjected to a boriding treatment to form a boride layer having 0.005- 0.15mm. depth in the stage of performing liquid phase joining of an Ni base heat resistant alloy contg. 8-35wt% Cr, 0.1-40% >=1 kinds of Fe and Co, 0.1-15% >=1 kinds to Ti and Al, etc. The joining members are heated to 1,050-1,280 deg.C under press-contact with each other and are thus subjected to liquid phase joining in a non-oxidizing atmosphere of a vacuum, inert gas, etc. The joint part having high strength is obtd. by the above-mentioned method without using a brazing filler metal of powder or quickly cooled foil.

Longitudinal seam welding of uoe steel pipe

Abstract: PURPOSE:To perform satisfactory longitudinal seam welding of a UOE steel pipe by welding the outside surface side of a solid or clad steel blank pipe consisting of a stainless steel, nickel alloy, etc. subjected to O forming by a combination of plasma welding and other kind of welding and the inside surface side by TIG welding. CONSTITUTION:The joint part of a solid or clad steel blank pipe consisting of a stainless steel, nickel alloy or non-ferrous metal, etc. subjected to U and O forming is joined by a combination of plasma, SAW or MIG welding, etc. and TIG welding on the outside surface side to increase the welding speed and to prevent various kinds of brittleness and crack. The inside surface side is joined by TIG welding or a combination of MIG welding and TIG welding to flatten the bead and to prevent defect. The defect-free longitudinal seam welding of the UOE steel pipe is executed with high efficiency by such combined welding.

Brazing filler metal for joining zirconia and stainless steel

Abstract: PURPOSE:To form a joined part having substantial heat resistance and high toughness by using a brazing filler metal formed by incorporating a specific ratio each of Ni, Mn, B and Ag into Zr to join zirconia and stainless steel. CONSTITUTION:The brazing filler metal consisting, by weight %, of 10-35% Ni, 0.5-5% Mn, 0.1-1.0% B, 0.5-5% Ag and the balance Zr is prepd. The stainless steel and zirconia are butted by using such brazing filler metal and are heated to melt the brazing filler metal in a vacuum or reduced atmosphere contg. a small amt. of inert gas, by which the stainless steel and zirconia are joined.

Welding method of aluminum by yag laser

Abstract: PURPOSE:To perform surely airtight welding without generation of cracks, by using Al and an Al alloy or the Al alloys with each other as welding base materials, interposing a filler metal consisting of the Al alloy differing from the base materials and welding the same by a YAG laser. CONSTITUTION:A filler metal 10 consisting of an Al alloy differing in components from a welding base material 8 consisting of an Al alloy and a welding base material 9 consisting of Al is interposed between said base materials, and the materials are grasped under pressure from both sides onto a moving table 5 by means of jigs 6, 7. The pulse laser light from a YAG laser oscillator 1 is irradiated at a high output and a high repetitive rate from a nozzle 4 onto the weld zone of the materials 8, 9; at the same time, the table 5 is moved in an arrow direction. The materials 8, 9 are successively welded while the materials are welded together with the metal 10. Since the metal 10 melts into weld beads, the high temp. strength is improved by the silicon contained therein and the airtight welding is accomplished without generation of cracks.

Welding method of stainless steel piping

Abstract: PURPOSE:To reduce a welding cost by disposing successively plural pieces of stainless steel pipes on the same axial lines, sealing gaseous nitrogen therein, and joining the successive junctures thereof by inert gas welding CONSTITUTION:Stainless steel pipes 10, 12 are adjoined to each other on the same axial line, and the outside ends of both pipes 10, 12 are respectively closed A feeding port 14 and a discharging port 16 for gaseous nitrogen are respectively provided to the closed ends of the pipes A tungsten electrode 20 is positioned above the juncture of the pipes 10, 12, and the open end of a welding torch 18 is positioned to face the central part The gaseous nitrogen is fed and filled through the port 14 into the pipes 10, 12, and gaseous argon 22 is discharged from the inside of the torch 18; at the same time, an arc is generated between the electrode 20 and the pipes 10, 12 and a filler metal 24 is inserted into the arc to perform welding The oxidation of the inside surface of the weld zone is prevented and the welding cost is reduced by using gaseous nitrogen for the inert gas in the above-mentioned way

Indirect brazing of structural ceramics for uncooled diesels

Abstract: An important technological advance was made recently when processes were demonstrated for brazing partially stabilized zirconia (PSZ) to nodular cast iron (NCI) at a temperature sufficiently low (735/sup 0/C) as not to degrade the properties of NCI. This advance was enabled by a new process, termed the active substrate process, rather than by the usual active filler metal approach. The brazing is performed in vacuum and utilizes treatment of the ceramic surface with an active agent to trigger wetting and strong bonding, in conjunction with a ductile, low-melting filler metal. The cast iron is specially treated to enable the filler metal to braze to it. Single-cycle (one-stage) processes are detailed for joining PSZ to NCI with a titanium transition piece (TP) to minimize strain on the ceramic and also without the TP. Preliminary data are presented on shear strength at the braze interfaces and on resistance to thermal shock and thermal cycling of 2.5-cm dia demonstration joints.

Production of heat exchanger formed of aluminum

Abstract: PURPOSE:To obtain a titled heat exchanger which prevents pitting in particular and has good corrosion resistance by brazing a tube material on the outside surface of which a prescribed amt. of Zn is deposited and a fin material on which a brazing filler metal consisting of an Al-Si alloy having the lower m.p. than the tube material in an inert gaseous atmosphere. CONSTITUTION:Zn is deposited to 0.5-25g/m on the surface of a tube material. On the other hand a fin material on which a brazing filler metal consisting of an Al-Si alloy having the m.p. lower than the m.p. of said tube material is coated is prepd. The tube material and the fin material are assembled to a prescribed construction and the assembly is brazed at about 580-600 deg.C in an inert gaseous atmosphere of N2, etc. Brazing is thus accomplished by decreasing considerably the evaporation of Zn, by which the sacrificial anode of the Al material is improved and the heat exchanger formed of Al having improved corrosion resistance is obtd.

Vacuum brazing sheet for aluminum

Abstract: PURPOSE:To obtain the titled brazing sheet with high suitability to brazing and superior resistance to grooving due to erosion by using a brazing filler metal made of an Al alloy having a specified composition consisting of Si, Mg, Bi, Be and Al as a shell material and a corrosion resistant Al alloy as a core material. CONSTITUTION:One side or both sides of a core material made of a corrosion resistant Al alloy are clad with a brazing filler metal made of an Al alloy consisting of, by weight, 7-13% Si, 0.4-2% Mg, 0.01-0.2% Bi, 0.0005-0.01% Be and the balance Al with inevitable impurities as a shell material to obtain a vacuum brazing sheet for Al. The sheet forms a satisfactory fillet in vacuum brazing and inhibits grooving due to erosion, so a sound vacuum-brazed article can be obtd.

Metallurgical reaction and deposit fusion boundary microstructure under a stationary plasma arc

Abstract: Alloy element loss, decarburization in melted region and microstructural change of a deposit fusion boundary under a stationary plasma arc have been investigated by a first-order kinetic and interfacial microstructure. The cylindrical specimens of iron-based alloys, Fe-C, Ni-C, and Co-C alloys were locally melted by a plasma arc using argon plasma gas and Ar+H2 shielding gas, and the rates of alloy element loss and decarburization in the melted region were measured. Moreover, the fusion boundaries experienced when nickel, iron, Ni-Fe filler metals were deposited on iron, Fe-C, nickel and cobalt base metals, were evaluated metallographically. The initial rate of alloy element loss decreases as follows: Fe-Al>Fe-Mn>Fe-Cr>SGI-Mg>Fe-Ni. The loss reaction mechanism is metallic evaporation and the rate seems to be limited by transport in the gas boundary layer. The magnitude of decarburization is as follows: Ni-C>Fe-C> Co-C. The decarburization rate in Fe-C alloy is assumed to be governed by a process involving mass transfer in the gas phase and the molten metal. However, at low carbon concentrations, the rate appears to be limited by transfer in liquid metal. Fusion boundary deposited with nickel filler metal on iron is regular, but with carbon added to iron, an infiltration of deposit metal into adjacent base metal occurs. The fusion boundary with iron deposited on nickel is irregular where thin Ni-Fe solid solution is formed. In a deposited fusion boundary of cobalt with iron, nickel, and Ni-Fe filler metals, FeCo compound formation occurs, with cobalt dissolving into the nickel deposit metal resulting in a tongue-like structure produced by nickel penetration and a fine columnar substructure formation produced by Ni-Fe diffusion.

Raw material sheet for sintered metallic body and its production

Abstract: PURPOSE: To obtain a raw material sheet for a sintered metallic body having the improved peeling strength to a base material by sticking a brazing filler metal to the adherend surface of a sheet-shaped material obtd. from a kneaded mixture composed of sinterable metallic powder and resin binder and finishing the sheet to have the desired thickness. CONSTITUTION: The synthetic resin binder is mixed with a powder mixture composed of a sinterable metal consisting of self-fluxing Ni alloy powder and Mo powder, etc. and is kneaded. The mixture is subjected to rolling, etc., by which a plastic sheet-shaped material So is obtd. The brazing filler metal Hs made into a net shape, etc. is surposed on such material So and the material is passed through a rolling mill M to penetrate the metal Hs into the adherend surface of the material So, thereby sticking said metal. The material So is at the same time finished to a desired thickness. The raw material sheet St for the sintered metallic body having the considerably improved peeling strength to the base of the sintered body is easily obtd. by the above-mentioned method. COPYRIGHT: (C)1986,JPO&Japio

Brazing filler metal and composite target for x-ray tube

Abstract: PURPOSE:To provide a brazing filler metal which joins securely a high melting metallic material and graphite by consisting the same of clad foil provided with an Ni or Co layer on the surface of a metallic material of Zr alone, a Zr alloy of the specific compsn contg W, Mo, Ni, etc or Ti, Nb, Ta, etc CONSTITUTION:This brazing filler metal consists of the clad foil provided with an Ni or Co layer having 001-20mum thickness on the surface of one kind of metallic materials such as Zr simple substance, a Zr-W alloy contg <=30wt% W, a Zr-Mo alloy contg <=30% Mo, a Zr-W-Ni alloy contg <=30% W and <=20% Ni, a Zr-Mo-Ni alloy contg <=30% Mo and <=20% Ni, or Ti, Nb, Ta, etc Said material joins securely a high melting metallic material and graphite This brazing filler metal is particularly adequately applicable as a brazing filler metal for joining the W or its alloy, W or its alloy/Mo, etc and graphite of a composite target for the rotating anode of an X-ray tube

Brazing method of lead frame

Abstract: PURPOSE:To prevent the generation of a bridge due to an excessive brazing filler metal at the end section of a ceramic substrate by mounting dummy leads absorbing the excessive brazing filler metal on both outsides of a lead row. CONSTITUTION:Wide leads 14, 15 for absorbing an excessive brazing filler metal are formed to a lead frame 1. The excessive sections 12, 13 of a brazing filler metal 5 are held so as to be in contact with the leads 14, 15, and heated up to a brazing temperature. Since the excessive brazing filler metals 12, 13 adhere on the noses 18, 19 of the leads 14, 15 under a melted state and are absorbed, solder in the same quantity as terminals 7 normally brazed also adheres on terminals 16, 17, and no bridge is generated. A lead connecting member 2 is cut along cutting lines 20, 21, and the leads 14, 15 for absorbing excessive solder are detached, thus obtaining a ceramic substrate with the leads in which all terminals 4 are brazed normally without being bridged.

Production of welded pipe by overhead tig welding

Abstract: PURPOSE:To obtain a pipe which is usable as welded, by curving a thin sheet of an N-, Co- or Fe-base alloy to a pipe shape of a small diameter, directing the groove of the unwelded pipe downward, and subjecting the groove by TIG welding with the welding torch in an overhead position from the outside diameter side. CONSTITUTION:A groove part 1 of about <=5 deg. angle and about <=alphamm. root gap is provided on the outside diameter side of an unwelded pipe A, and is positioned to face downward. A backing strip permitting free blowing of back shielding gaseous Ar is pressed to the bore side of the groove 1. On the other hand, a welding torch 2 is held upward on the outside diameter side thereof to direct the arc 5 generated from a tungsten electrode 9 toward the groove 1 thereby TIG- welding the groove in one layer without using any filler metal. The formation of weld beads which are extremely sound and are free from any overhang or depression on both front and rear sides is thus made possible. This method is adapted to a welded pipe of 1-4mm. wall thickness and 15-50mm. bore.

Filler metal for diffusion joining of ferritic heat resistant steel

Abstract: PURPOSE:To form a joint part having the metallic texture and joint strength equivalent to those of a base material consisting of a ferritic heat resistant steel by specifying the compsn. of a filler metal for diffusion joining of the ferritic heat resistant steel. CONSTITUTION:The compsn. of a filler metal for diffusion joining of a ferritic heat resistant steel of this invention consists of 5-22atom% boron, 0-12atom% silicon, 0-20atom% carbon, 0-20atom% chromium, and the balance iron with unavoidable impurities. Since the filler metal consists essentially of iron without contg. Ni, the joint part does not form any dissimilar and brittle phase and has the compsn. equivalent to the compsn. of the base material, i.e. the ferritic heat resistant steel.