Showing papers on "Filler metal published in 1977"

Method for fabricating a rotary drill bit and composite compact cutters therefor

Abstract: A method for fabricating a drill bit comprising a plurality of composite compact cutters by furnace brazing each cutter in a recess in the crown of the drill bit. In one embodiment, each cutter is comprised of a mass of bonded polycrystalline abrasive, a substrate bonded to said abrasive mass and a thin layer of brazing filler metal coating the exposed surface of the substrate. In another embodiment, the cutter comprises a composite compact cutter blank bonded to one end of a cemented carbide pin, and a thin layer of brazing filler material coating the substrate of the blank and the carbide pin. In both embodiments, the coating of brazing filler metal is applied to the cutters by dipping in a molten bath of the filler metal.

Comparative Distortion in Three-Unit Fixed Prostheses Joined by Laser Welding, Conventional Soldering, or Casting in One Piece

Abstract: This study was conducted to evaluate objectively the relative distortion in three-unit bridges joined by laser welding, soldering, or one-piece casting techniques, Each procedure was replicated five times. Laser welding and one-piece castings of three units were found to be significantly superior to soldering. The laser welding was most reliable.

Welding Process Technology

Abstract: Preface 1. Properties and classification of welding processes 2. The welding arc 3. Flux-shielded arc welding 4. Gas-shielded arc welding 5. Unshielded and short-time arc welding 6. Resistance welding 7. Thermochemical welding 8. Radiant-energy welding 9. Solid-phase welding 10. The selection of welding processes 11. Automatic welding 12. Economic considerations Index.

Method and apparatus for tig welding

Abstract: A method for TIG welding by using a plurality of nonconsumable electrodes extending frm the tip of a TIG welding torch and one filler wire fed through a space between the electrodes, each electrode being independently supplied with power. A molten pool is formed by melting both the base metal to be welded and the filler wire by means of arcs generated between respective electrodes and the base metal. Melting of the base metal is mainly controlled by the arc produced by one of the plurality of electrodes while melting of the filler wire is mainly controlled by the arc generated by the other electrode.

Controlled weld-pool solidification structure and resultant properties with yttrium inoculation of Ti--6Al--6V--2Sn welds

Abstract: The program discussed was designed to improve weld quality in Ti-662 sheet. The approach was based on establishing an alloy addition which could be introduced to the weld puddle via the welding filler metal and would provide a relatively homogeneous fine precipitate for grain size control. Yttrium was selected because of its low solid solubility in the titanium alloy and high affinity for oxygen, (-90,000 cal/mole free energy of formation per oxygen atom vs. -70,000 cal/mole for titanium at 3100 F, i.e., 1704/sup 0/C).

Method of arc welding under water

Abstract: In a method of arc welding under water or at superatmospheric pressure (or both) the weld is made in a chamber containing a gaseous atmosphere. The weld metal is deposited from flux-cored welding wire whose core contains strong deoxidant(s) such as aluminium, magnesium, titanium, zirconium, lithium and calcium. A shielding gas containing a selected proportion of oxygen or oxygen-containing gas but consisting mainly of an inert gas such as argon or helium is employed to surround the arc. The shielding gas is constituted by the atmosphere in the chamber.

Combination welding torch for shielded inert gas or electric arc welding

Abstract: Welding torch comprises a combination collet body which functions interchangeably for electric arc welding, of the open arc type using a consumable electrode, or for inert gas shielded welding using a non-consumable electrode The collet body has a screw-threaded collar at one end which is screwed into the welding head At the other end, it has a slitted or splined chuck The slightly enlarged central body portion between the collar and the chuck includes a plurality of gas vents For open arc welding, a consumable electrode, interposed into the chuck, is secured in place by a constricting metal adapter sleeve which also serves to close the gas vents For inert gas shielded welding, the consumable electrode and the metal adapter are replaced by a nonconsumable electrode and a ceramic shield open at one end The open vents permit inert gas to escape under the ceramic shield and surround the nonconsumable electrode during the welding process

Method of welding laminated sheed metals

Abstract: PURPOSE:To accomplish welding of two assemblies of laminated sheet metals together in a proper fusion width by preventing the peeling of sheet metals and the development of defective welding through irradiation of electron beam or the like along a weld line, with clamping of press plates having a given thickness, made of the material identical to the metals so arragned on the surface of the metal assemblies or placed in contact therewith.

Method of connecting metallic parts by means of arc fusion welding

Abstract: A method of connecting metallic parts, and metallic parts so produced, by means of arc fusion welding by producing a low volume welding seam (narrow gap welding), wherein the workpiece parts to be jointed and forming a narrow gap are initially welded at their butt joint by means of, for instance, electron-beam welding, plasma-arc welding, laser-beam welding or argon arc-welding to produce a base seam with or without filler material, and thereafter the workpiece flanks forming the narrow gap are united by alternately depositing weld beads at first one and the other workpiece flank by submerged-arc welding.

A review of minor element effects on the welding arc and weld penetration

Abstract: A critical review of all the available literature pertaining to welding arc and weld penetration has been undertaken The review revealed several studies which indicate that the intentional or unintentional addition of small amounts of halides to the base material significantly improves weld penetration The presence of oxygen in the weld materials has been reported to have both positive and negative effects on the depth and shape of the weld Various other elements present in the base material have been alluded to as a means of changing the penetration characteristics of the GTAW process In particular, aluminum addition to the arc or excessive aluminum in the base material has been observed to produce a flared arc at the anode surface In many cases these changes are accompanied by variations in the arc voltage which, if properly interpreted can act as a warning signal for potential problems The general conclusion of all the published reports stress the need for additional systematic study and further research into this problem area in order to understand the causes and effects that have been noted experimentally An attempt has therefore been made to provide some beginning and rationale for understanding how the properties of minor elements can affect the factors which influence weld penetration In particular, the factors discussed relate to changes in the work function of both the anode and cathode surfaces, the arc voltage and arc configuration, in addition to surface tension effects of the weld puddle and arc stability In order to provide much-needed additional experimental data to this problem area, a spectroscopic analysis of a typical GTAW arc was undertaken and a simple test initiated to determine the "penetration" qualities of various heats of EN 82 filler material The results and conclusions of these studies are reviewed

Composite piston for high performance engines - has thermal cracking preventing welding ring on piston cavity edge

Abstract: The composite piston for an internal combustion engine has upper and lower part. The upper part has cavity for combustion chambers, and is used in high performance engines. The upper edge of the piston top face cavity is especially protected against thermal cracking. A ring of high temperature resistant material is welded on the edge (20) of the combustion chamber cavity in the piston. This ring is welded without use of filler metal by electron beam welding on the piston upper part (12) or by friction welding. A conical seat between the ring (16) and the piston upper part (12) is provided for welding. A tubular component can be welded by friction welding and excess material is removed by machining.

Preliminarily treating method for diffusion welding of stainless steel, aluminum or aluminum alloy

Abstract: PURPOSE: To enable the effective diffusion welding, by electrolyzing in the electrolytic solution using the welding material consisting of stainless steel or Al(alloy) as the anode, removing the oxide and nitride coating on the surface and then immediately plating a specified metal respectively using the welding material as the cathode. COPYRIGHT: (C)1978,JPO&Japio

Method and apparatus for resistance welding

Abstract: PURPOSE:To supply optimum welding current and enable the carrying out of always accurate and stable welding by judging whether the welding works are properly held or not by supplying weak current before resistance welding thereby supplying optimum welding current by sending the current supply command to the welding power source. CONSTITUTION:Prior to welding work, the optimum welding conditions obtained by experiment are set in an AC welding power source 20. The welding works 1, 1' are sandwiched and pressed by electrodes 2, 2' and switches S1, S2 are closed by a sampling signal generator 11 to supply the sampling signal to the welding electrodes 2, 2'. The electric quantity generated is input to a comparator 13 and is compared with the electric quantity in a normal welding state before the current supply. If the electric quantity is abnormal, the subsequent current supply is stopped by a stop signal generator 14. In case it is normal, the output signal of the comparator 13 is put in the clock circuit 23 of the AC welding power source 20 to command the start of supplying welding current.

Method of and apparatus for welding sheet steel panels

Abstract: A method of and apparatus for welding sheet steel panels by submerged arc welding is described. By providing one or, depending on the thickness of the sheet steel panels, more than one pair of closely spaced wire electrodes in the weld gap with the simultaneous introduction of additional filler metal carrying no current, preferably in the form of a metal powder, disadvantages associated with known methods may be avoided.

Heat resisting copper base brazing filler metal

Abstract: A heat resisting copper base brazing filler metal consisting essentially of by weight percent, 10 to 20 manganese, 2 to 10 nickel, 0.5 to 4.0 tin, 0.5 to 4.0 indium and balance copper. The brazing filler metal provides sound, tight joints with excellent strength retention at elevated temperatures.

Inductive preheating of wire or strip welding electrodes - before immersion in melting bath or before arc ignition

Abstract: Wire- or strip electrodes are inductively heated before immersion in melting bath or before ignition of arc. After passing through weld current contact, the electrodes are passed through an induction circuit. Preheating achieved can be varied and can be brought to 1000 degrees C, according to welding process and alloy compsn. Inductive preheating of currentless wire- or strip electrodes takes place directly (30-50 mm) before immersion in melting bath. Heating method can be applied to electrodes of all profiles and dia., for welding processes including metal active-, MIG, TIG, submerged arc-, electroslag and filler wire welding, opt. under a protective gas. Inductive preheating of filler wire electrodes helps to achieve an additional drying of the often hygroscopic flux fillings. Fusing efficiency is not reduced. Burning down of alloying elements is reduced, and degradation of alloying elements, by dilution with substrate material is prevented.

Nickel-base brazing filler metals for aircraft gas turbine application

Abstract: Brazed joints of the nickel-base brazing filler metal demonstrated superior ambient temperature shear strength as well as ambient temperature and 482/sup 0/C (900/sup 0/F) fatigue strength when compared to the substantially more expensive gold-base filler metal in laboratory mechanical testing A similar fatigue strength advantage was observed at these temperatures for aluminide-coated braze joints of filler metal compared to gold base filler metal On the basis of laboratory testing to simulate the engine environment, both uncoated and aluminide-coated brazed joints of nickel and gold base filler metal-displayed excellent oxidation and salt corrosion resistance Repair procedures of individual braze joints were established and demonstrated for nickel base brazing filler metal Acceptable experience in both manufacturing and engine testing has led to incorporation of the cost-effective nickel base brazing filler metal into a production engine model

Device and welding torch for plasma-mig-welding

Abstract: A compact plasma-MIG welding torch in which the contact tube and the nozzle are directly connected together electrically, thereby enabling welding with a very short extension of the welding wire

One-side arc welding method for 9% ni steel

Abstract: PURPOSE: To obtain sufficient welded joint strength as well as uniform Uranami in one-side arc welding of thin 9% Ni steel by specifying the shape of bevel, the compsn. of a weld material and that of a secondary filler metal so as to reduce dilution of a weld metal with the base material. COPYRIGHT: (C)1978,JPO&Japio

Method for butt-welding cylindrical metallic rods

Abstract: The disclosure relates to a method and a device for butt-welding rotational cylindrical metallic rods without filler metal and without forming a rim or deformation in the welded area. The method consists of bringing the two ends coaxially to be welded into contact proximity without compression and applying welding power while simultaneously rotating the two rods in relation to the welding heat source around their common rotational axis to an extent of more than one complete revolution.

Method of making knives

Abstract: A method of making knives in which a separate blade and handle are bonded together by electron-beam welding which reduces the susceptibility to corrosion at the weld area and thereby increases the knife life. In addition, the blade can be unhardened when welded, and hardened after welding to reverse any structural changes occurring in the metal adjacent the weld and thereby more reliably reduce the susceptibility to corrosion at the weld area. The step of hardening the blade after welding can be used to provide satisfactory corrosion resistance in knives where separate blades and handles are joined by other welding techniques such as electrical seam and oxyacetylene welding.

Stainless steel filler metal and sintered alloy to be welded which hav e good weldability

Abstract: PURPOSE:Offering stainless steel filler metal and stainless steel-sintered material of high quality whose composition is strictly controlled and which can be easily formed into wires and straps, are low-priced in generall and have good weldability.

Welding dissimilar metals, e.g. steel to copper-nickel-iron alloy - using nickel filler wire contg. stabilising element

Abstract: Dissimilar materials such as a ferrite material and a copper-nickel-iron alloy are welded using a filler metal composed of Ni contg. a small amt. of a stabilising element e.g. 0.5-1.5% Mn and/or Si. Used for welding tube bundles to tube plates in the prodn. of heat exchangers. Strong welds free from defects are obtd.

Method for welding workpiece parts by means of an energy beam

Abstract: In an energy beam welding method, as an electron beam welding method, wherein an elongated body or wire of filler material is introduced in a welding zone produced by the beam and comprising fused material, the filler material body is used to act on the fused material to prevent it from flowing out of the welding zone, which would cause voids and other defects of the seam produced. The method is particularly useful in welding thick workpieces as sheet metal plates with thicknesses of one to two inches and more.