Showing papers on "Gas metal arc welding published in 1971"

Combination welding torch

Abstract: A combination welding torch. Adapter means are provided for electric arc welding utilizing a consumable electrode interchangeable with elements for inert gas shielded arc welding utilizing a non-consumable electrode, and connection means are provided for use in the welding torch apparatus, to thereby provide a unitary welding torch usable interchangeably for performance of welding operations.

Method for the ultrasonic welding of wires on the metal surface of a support

Abstract: A method of and a device for the ultrasonic welding of wires comprising a non-metal insulating layer on the metal surface of a support by means of a welding tip which is made to vibrate in a direction parallel to the longitudinal direction of a wire to be welded; according to a previously programmed welding cycle, the insulating layer is first removed locally and the wire is then welded; a preceding mechanical or chemical cleaning of the wires is not necessary. The method according to the disclosure provides a welded joint which has compact dimensions and a high mechanical strength.

Method of and apparatus for welding an end plug onto a nuclear fuel element

Abstract: Welding methods and apparatus for bonding a metallic end plug into an end of a metallic fuel tube or rod for a nuclear reactor. Defects in the weld joint between the fuel tube and end plug are substantially reduced by arc welding in a chamber filled with an inert gas, disposing the welding electrode directly over the joint to be welded, deflecting plasma produced during the welding away from the body of the fuel tube, and directing the plasma into the joint.

Electrical system for automatic arc welding

Abstract: A process and system for welding of the tungsten inert gas (TIG) type is described. A welding torch is mounted on a mechanism which provides for motion of the torch with respect to the work (a pipe being welded) in three different directions. Movement in each direction is electronically controlled so as to obtain preset magnitudes of oscillation of the torch, both vertically and laterally with respect to the work. The vertical oscillation is provided by following the pulsating arc current in accordance with a preselected control function. In addition, the system and process provides for control of substantially all of the parameters affecting the formation of the weld in order to produce improved weldments.

Tubular composite welding wire filled with potassium compounds containing flux

Abstract: A tubular composite welding wire for use in the automatic or semi-automatic welding process, which comprises:

Control apparatus for short-circuit arc welding

Abstract: An apparatus for controlling the feeding of the welding electrode in short circuit metal transfer arc welding which employs a feeding speed detecting circuit. The feeding speed varies according to variations in the period of shortcircuiting between the electrode and the workpiece and the time during which a welding arc is generated.

Process for welding sheet metal coated with layers

Abstract: A method for the connection of sheet metal panels coated on at least one surface with a layer by the electrical fusion of a metal, wherein the improvement comprises the steps of supplying an electric current for the fusion of metal indirectly along the sheet metal of at least one panel to the zone at which said panels are to be connected to each other, and keeping the temperature of an outer layer of at least one of said panels below the melting point of said layer.

Arc welding electrode and process for stainless steel

Abstract: There is disclosed an arc welding process for stainless steel and a flux-cored electrode particularly useful therein which is formulated of components having relatively low moisture absorptivity.

Tungsten inert gas welding control unit with a filler metal feeding means

Abstract: A welding control device for controlling the voltage, current and gas flow rate for a gas tungsten arc welder type welding unit. A motor driven rheostat current decay control is provided to prevent abrupt weld cut-off. The remote console unit comprises a current preset means, a gas control, a voltmeter and ammeter to maintain the voltage and current as well as a filler metal feeding means. The metal filler means is located on and attached to the forward portion of the two button decay control switch.

Electric arc welding process

Abstract: An electric arc welding process for welding together sheets of unalloyed or low alloyed structural steel utilizes a consumable wire electrode under shielded gas and is characterized in that the welding is conducted with a voltage of 25 to 40 V at a current density of 300-400 A/mm2 wire electrode cross-section with the wire electrode having a diameter of about 0.8-1.2 mm and the shielded gas containing at least some CO2.

Short-circuit inert gas consumable electrode process using additions of 10-14% nitrogen

Abstract: A gas shielded consumable electrode welding process for welding of materials such as 9 percent nickel steels and nitrogen stainless steels with relatively inexpensive stainless steel wire which includes utilizing a shielding gas of 10-14 percent nitrogen balance argon, helium or mixtures thereof, and a short-circuit arc deposition as the arcing process.

Method and apparatus for overlaying weld metal which prevents the emission of noxious gases therefrom

Abstract: An inert-gas-shielded submerged arc welding process which prevents emission of noxious gases when overlaying aluminum bronze on a steel base. Apparatus is also disclosed for confining granular flux in the proximity of a welding torch when making an overlay on a cylindrical surface.

Wire attitude control

Abstract: A wire feed apparatus for use in conjunction with the gas metal arc welding process The apparatus includes means for pulling the consummable electrode wire from a reel, a means for giving the wire a radius of curvature and means for controlling the attitude of the wire as it is fed to the work area The attitude is adjusted by means of a skew adjustment on one of the drive wheels which causes the wire to be delivered at a controllable angle to either side of the plane passing through the arc over which the wire has been bent

Effect of Welding Atmospheres and Welding Polarity on the Nitrogen Content of Weld Metals

Abstract: Mild steel and stainless steel were welded in controlled arc atmospheres.Effect of nitrogen partial pressures in the welding atmospheres of N2, N2-Ar, N2-O2, Air, N2-CO2 or N2-H2 and welding polarity on the nitrogen content of weld metals was systematically studied.The main results obtained are summarized as follows:1. The nitrogen content of weld metals made in neutral or reducing atmospheres such as N2-Ar or N2-H2 increases with the increase of the partial pressure of nitrogen.2. The co-existence of oxidizing gas with N2 in the arc atmosphere increases greatly the nitrogen content of weld metals.3. Anomalous absorption of nitrogen was observed at low pressures of the arc atmospheres.4. The nitrogen content of mild steel weld metals made in N2, N2-Ar, or N2-H2 welding atmospheres is not influenced by welding polarity, while the nitrogen content of stainless steeel weld metals made with DCSP is more than that with DCRP.5. In oxidizing atmospheres such as N2-O2 or N2-CO2, weld metals absorb much more nitrogen with DCRP than with DCSP.

Phenomena of the Molten Pool at High Current and High Speed MIG Welding

Abstract: The authors have studied the mechanism of bead formation, taking note of the discontinuous bead, particularly "humping bead" at high current and high speed welding. Following facts are clarified.1. In high current and high speed welding, the difference of temperature between the front part and the rear part of the molten pool is much greater than that in ordinary welding and this temperature difference causes strong surface-tension-stream directing from the front to the rear part of the pool resulting in the discontinuity of the bead.2. The authors have investigated some methods to prevent the formation of the discontinuous bead at high speed welding. The basic conceptions are as follows:a. Gravity control of the streamb. Decrease of temperature difference between the front and the rear part of the molten poolc. Decrease of surface tension of the molten poolThese methods aim to repress the strong stream from the front to the rear of the molten pool.For example, by elongating wire extension the arc takes the form of so-called "rotating arc", which heats the molten pool uhconcentratively different from concentrative heating of spray arc and acts to prevent discontinuity of the bead. Fig. 5 shows the critical relation to get continuous bead at high speed welding. This curve is applicable to every diameter of wire.3. The authors analized "melting efficiency" (see equ. 4) of the bead and clarified the relation between "melting efficiency and bead character". The results show that the welding speed at maximum melting efficiency is the limit to form the continuous bead.

Anti-hygroscopic arc welding coated electrode and the process for producing the same

Abstract: AN ANTI-HYGROSCOPIC ARC WELDING COATED ELECTRODE CONTAINS, AS A BINDER FOR THE COATING MATERIAL OF THE ELECTRODE, A GLASS POWDER HAVING A SOFTENING POINT OF FROM 350* TO 550*C., WHICH MELTS AND COVERS THE GRAINS OF THE COATING MATERIAL, WHEN HEATED TO A TEMPERATURE ABOVE THE SAID SOFTENING POOOINT, SO AS TO FORM VITREOUS FILMS THEREAROUND.

Resistance welding of aluminum

Abstract: Resistance welding such as spot welding of aluminum sheets and the like is greatly enhanced by the provision of a reacted silicate coating which substantially extends the useful life of welding electrodes by reducing pickup of aluminum on the electrode.

Nonconsumable tungsten electrode for arc welding

Abstract: A nonconsumable tungsten or tungsten alloy electrode for arc welding having a cylindrical body ending in a planar end surface characterized by a cavity on the center line of the end surface to produce an annular flat surface at the electrode tip. The cavity is preferably a cylindrical cavity having a diameter in the range of 25 to 50 per cent of the diameter of the electrode and the cavity may terminate in a flat bottom or a conical portion. The tip configuration formed by the cavity improves the dimensional stability of the tip so that the arc formed during welding is concentrated and stabilized at the centerline of the electrode.

Arc welding flux

Abstract: A WELDING FLUX WHICH COMBINES THE ADVANTAGE OF EXCELLENT SLAG REMOVAL IN MULTIPLE PASS DEEP GROVE WELDING AND IS "NEUTRAL" IN THAT THE WELD METAL ANALYSIS IS RELATIVELY UNAFFECTED BY CHANGES IN ARC VOLTAGE.

Weld support for welding apparatus

Abstract: A weld support for a gas shielded metal arc welding apparatus is disclosed as having a welding block provided with a relatively flat surface, a resilient rubber strip around the periphery of the flat surface, a welding chamber within the block and a plurality of gas exhaust passages connecting the welding chamber and the exterior of the block and having bends intermediate their extremities. A shielding chamber is affixed to the welding block around an opening into the welding chamber for receiving and holding a nozzle of the welding apparatus perpendicular to the flat surface of the welding block and enclosing shielding gas fed through the nozzle into the welding chamber. When a weld is being made, the welding block is held against the material being welded to maintain the welding apparatus perpendicular to the material. The rubber strip assists in maintaining this perpendicularity by accommodating any irregularities in the surface of the material. The rubber strip also prevents flow of molten weld material away from the vicinity of the weld spot. The bend in the gas exhaust passages prevent weld spatter from escaping from the welding chamber.

Chemical welding material

Abstract: THE INVENTION PROVIDES A CHEMICAL WELDING COMPOSITION MATERIAL OF A POWDERED LIGHT METAL AND A METAL OXIDE MOLDED UNDER PRESSURE INTO A SOLID FORM, THEREBY PRODUCING A MATERIAL CAPABLE OF PROVIDING CONCENTRATED HEAT TO WELD WORKS QUICKLY, AND ENSURING ADAPTABILITY OF THE COMPOSITION MATERIAL FOR WORKS DIFFICULT TO WELD, SUCH AS WITH DEEP HOLES, NARROW CURVED PARTS, OR LENGTHY WORKPIECES, WITHOUT NEED FOR SPECIAL PROCEDURES OR TOOLS.

Welding arrangement of explosive-plated metal sheets

Abstract: The present disclosure relates to a process and arrangement of elements for welding explosive plated metal sheets which substantially eliminate the formation of cracks when the weld is exposed to mechanical stresses.

On Underwater Plasma Welding

Abstract: Since plasma arc has been considered to be a suitable heat source for wet welding owing to the following factors, the feasibility of underwater welding by it is studied.(1) Plasma arc co-operating with plasma jet can be generated easily and kept in stable state in water, and is less sensitive to variations in torch-to-work spacing.(2) As energy transferred from plasma arc to work is highly concentrated, fusion efficiency of work is high.(3) Plasma arc is constricted by torch nozzle, so its directional property is excellent.(4) Plasma jet, kept operating all the diving time, acts as illuminating light source and makes it easy for the welder to work in water.As the first step to develop the process, preliminary experiments on some of the above-mentioned factors are made in simple welding environment, such as in city water and at water depth of 20 cm. And then butt welding and fillet lap welding under the conditions adopted according to information obtained in the preliminary experiments are done by using steel as base metal for a welded structure of 6 mm in thickness. Results of experiments show that underwater welding by plasma are (semi-transferred type plasma jet, i.e., plasma jet co-operates with plasma arc) can be done easily and stably and the weld has excellent properties in both tensile strength and notch toughness, though the weld metal includes blowholes to some extent. In conclusion, it is ascertained that this process can be put to practical use.

Method of electric-arc welding of tubular products with magnetic control of the arc

Abstract: A method for the electric-arc welding of tubular products, in which a magnetic field is made to act upon the arc so as to control the process of welding, the method characterized in that the magnetic field is established in the welding zone by passing an electric current along the workpiece from a separate current source.

Process for the manufacture of a welding wire, and welding wire

Abstract: A process for the manufacture of a welding wire having a core of base welding steel provided with a covering of an additional element, which comprises depositing a coating of said additional element directly onto the core of base welding steel. Preferably the additional element is deposited by the method of evaporation under vacuum.

Study on the Underwater Welding (Report 1)

Abstract: Underwater welding was experimentally carried out in a water box by coated electrodes and semiautomatic CO2 welding. And It was investigated the occurrence of blowhole was affected by various welding parameters.The following results were obtained:1) Sound deposited metal and welded joints were obtained under flat, horizontal and vertical positions from every coated electrode except the low hydrogen type one. Kinds of power sources and water proofing coatings of electrodes had no special effect on appearance and soundness of bead.2) Welded joints by coated electrodes were superior in tensile strength but inferior in ductility to the mild steel base metal.3) It was difficult to get a sound weld metal by low hydrogen type electrode under water. Blowholes in weld metal were remarkable in all welding current and arc voltage ranges.4) It was also considerably difficult to obtain a weld metal quite free from blowholes by underwater semiautomatic CO2 welding.