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Showing papers on "Gas metal arc welding published in 1975"


Journal ArticleDOI
TL;DR: In this paper, the authors describe measurements of the temperature distribution and the composition of the plasma-MIG arc system using optical spectroscopy and conclude that only a very small part of the wire current flows through the bright inner arc.
Abstract: Describes measurements of the temperature distribution and the composition of the plasma-MIG arc system using optical spectroscopy. It is found that the central part of the arc contains the elements Fe, Mn, Cu, Ca and Ar at a temperature of about 7000K. The outer regions of the arc show only argon spectral lines and have much higher temperature value ( approximately=13000K). From these measurements a number of conclusions can be drawn about the physical properties of the plasma-MIG welding arc. The most important conclusion is that only a very small part of the wire current flows through the bright inner arc.

56 citations


Patent
21 Nov 1975
TL;DR: In this article, a deformation deformation of definite curvature is used to restore the wire delivered from a welding nozzle to the deformation in a definite period from a delivery hole of the welding nozzle in butt welding of thick board.
Abstract: This invention provides arc welding methods and arc welding apparatus which weld materials by giving a plastic deformation of definite curvature to wire itself in a process before supplying the wire to a welding nozzle, restoring the wire delivered from the welding nozzle to the plastic deformation of definite curvature, delivering rotatively the end of the wire in a definite period from a delivery hole of the welding nozzle in butt welding of thick board, especially narrow gap welding.

26 citations


Patent
21 Nov 1975
TL;DR: In this article, a method of large current gas shielded arc welding is proposed, where the welding is accomplished at high speed by a single electrode or tandem sequence electrodes in an atmosphere of a mixed shielding gas comprising essentially of an inert gas with an addition of less than 30% of carbon dioxide gas or less than 5% of oxygen and supplied at an overall flow rate of 50 to 200 l/min.
Abstract: A method of large current gas shielded arc welding wherein the welding is accomplished at high speed by a single electrode or tandem sequence electrodes in an atmosphere of a mixed shielding gas comprising essentially of an inert gas with an addition of less than 30% of carbon dioxide gas or less than 5% of oxygen and supplied at an overall flow rate of 50 to 200 l/min by using large diameter solid wire consumable electrodes of low alloy steel material with a diameter of 3.0 to 6.4 mm φ under the following conditions: welding speed 300 to 1500 mm/min; welding current, 600 to 1500 amp; and arc voltage, 23 to 36 volts. With this method, the welding of steel can be accomplished at high speeds with a reduced heat input and an improved efficiency and it is particularly well suited for the welding of open tubes for very low temperature line pipe which must retain a high degree of toughness at very low temperatures.

20 citations


Patent
22 Aug 1975
TL;DR: In this paper, the ductile junction of metal-sheathed composite wire, such as flux-cored welding wire for use in automatic arc welding machines, is provided by process comprising resistance upset welding.
Abstract: Ductile junction of metal-sheathed composite wire, such as flux-cored welding wire for use in automatic arc welding machines, is provided by process comprising resistance upset welding

16 citations


Patent
02 Jun 1975
TL;DR: In this paper, a method of welding corner joints by means of a multiple electrode submerged-arc welding and adapted to be utilized for the manufacture of a hollow square steel pillar and the like structural frameworks is disclosed.
Abstract: A method of welding corner joints by means of a multiple electrode submerged-arc welding and adapted to be utilized for the manufacture of a hollow square steel pillar and the like structural frameworks is disclosed. The method of welding is effected under the following three conditions: 1. The distance between first and second electrodes is 30 to 80 mm, 2. The current flowing through the second electrode is 60 to 85% of the current flowing through the first electrode, and 3. The welding heat input H is given by H ≦ 24d.t KJoule/cm where t is a thickness of a steel flange plate in cm and d is a required penetration depth in cm, whereby a weld bead is completed by a single pass of welding.

14 citations


Patent
29 Jan 1975
TL;DR: The narrow gap butt welding of aluminum and aluminum alloy plates of a thickness more than 20 mm with a nonconsumable electrode is conducted by inserting a filling material into a welding groove, applying a direct current of more than 300 A between said non-consumeable electrode which does not have a sharp end and said plates to be welded with straight polarity, maintaining an arc length from 0.5 to 5 mm and shielding the welding groove area with a shielding gas comprising at least 50% helium as mentioned in this paper.
Abstract: The narrow gap butt welding of aluminum and aluminum alloy plates of a thickness more than 20 mm with a non-consumable electrode is conducted by inserting a filling material into a welding groove, applying a direct current of more than 300 A between said non-consumable electrode which does not have a sharp end and said plates to be welded with straight polarity, maintaining an arc length from 0.5 to 5 mm and shielding the welding groove area with a shielding gas comprising at least 50% helium.

14 citations


Patent
17 Nov 1975
TL;DR: In this article, the chemical composition of a mixed shielding gas fed to the electrodes is selected in such a manner that the chemical compositions of the shielding gas feed to the leading electrode or electrode group differs relative to that feed to a trailing electrode or group to have a different active gas volume ratio and in this way the weld metal layers formed by the preceeding and following welding operations are homogenizing to ensure uniformity of the properties at every positions in the weld zone.
Abstract: of the Disclosure In a multiple electode gas shielded arc welding method wherein a plurality of electrodes are arranged along the welding seam line of a piece of metal to be welded and the continuous gas shielded arc welding of the piece is accomplished simultaneously by the electrodes, the chemical composition of a mixed shielding gas fed to the electrodes is selected in such a manner that the chemical composition of the shielding gas fed to the leading electrode or electrode group differs relative to that fed to the trailing electrode or electrode group to have a different active gas volume ratio and in this way the chemical composition of the weld metal layers formed by the preceeding and following welding operations are homogenizing to ensure uniformity of the properties at every positions in the weld zone.

12 citations


Patent
17 Jul 1975
TL;DR: In this article, a method and apparatus for feeding welding flux to both the leading and trailing sides of the strip electrode used in a submerged arc strip cladding process is described, where the flux burden is caused to increase from a first depth directly behind the strip to a maximum depth at the trailing edge of the weld crater region where the quantity of liquid metal and liquid slag is a minimum.
Abstract: A method and apparatus is disclosed for feeding welding flux to both the leading and trailing sides of the strip electrode used in a submerged arc strip cladding process. In order to prevent distortion of the bead shape the pressure due to the weight of the flux burden is controlled to be less in the region of the molten metal and slag pools lying directly behind the welding arc. The flux burden is caused to increase from a first depth directly behind the strip to a maximum depth at the trailing edge of the weld crater region where the quantity of liquid metal and liquid slag is a minimum.

9 citations


Patent
15 Aug 1975

9 citations




Patent
19 Nov 1975
TL;DR: In this paper, a method of multiple electrode gas-shielded arc welding is described, in which a plurality of electrodes are arranged along the welding seam line of a piece of metal to be welded and the continuous gas shielded arc welding of the piece is accomplished simultaneously by the electrodes, the chemical.
Abstract: of the Disclosure In a method of multiple electrode gas shielded arc welding wherein a plurality of electrodes are arranged along the welding seam line of a piece of metal to be welded and the continuous gas shielded arc welding of the piece is accomplished simultaneously by the electrodes, the chemical. composition of the electrode wire of the electrode or electrode group for depositing a proceeding layer or layers is selected to differ from that of the electrode wire of another electrode or electrode group for depositing a subsequent layer or layers, whereby the chemical composition of the weld metal made by the preceed-ing welding operation is brought near to that of the weld metal made by the following welding operation and thus the uniform properties are ensured for the welding metals at the respective positions in the weld zone.

Patent
01 Jul 1975
TL;DR: In this paper, an electric arc is maintained between a welding wire and a workpiece in a thermally ionized gas, which is produced by an arc maintained between the workpiece and the inner surface of a nozzle which acts as a non-consumable electrode as a substitute for a separate tungsten electrode.
Abstract: Method of arc welding in which an electric arc is maintained between a welding wire and a workpiece in a thermally ionized gas which is produced by an electric arc maintained between the workpiece and the inner surface of a nozzle which acts as a non-consumable electrode as a substitute for a separate tungsten electrode.


Patent
Minoru Oishi1, Naoki Okuda1, Makoto Tomita1, Nobumasa Ohkubo1, Kogane Kazuo1, Yonezawa Kazuo1 
10 Feb 1975
TL;DR: In this article, a method of vertical welding of aluminum and aluminum alloys comprising welding Al or an Al alloy while oscillating in a welding groove an electrode in a closed pattern corresponding substantially to the groove shape, wherein the welding is conducted by using a welding current higher by 10 to 150 A than the base welding current at least during oscillation of the electrode along the groove face of one of the materials to be welded while the electrode is pursuing courses of oscillation along both groove faces.
Abstract: A method of vertical welding of aluminum and aluminum alloys comprising welding Al or an Al alloy while oscillating in a welding groove an electrode in a closed pattern corresponding substantially to the groove shape, wherein the welding is conducted by using a welding current higher by 10 to 150 A than the base welding current at least during the course of oscillation of the electrode along the groove face of one of the materials to be welded while the electrode is pursuing courses of oscillation along both groove faces of the materials to be welded.


Patent
25 Jun 1975
TL;DR: In this article, an aqueous dextrin solution which has been prepared in a specific viscosity is mixed and added in the flux to apply the solution on the flux uniformly, and further applying a suitable quantity of calcium stearate on the surface thereof thereby to make it possible to carry out effective welding.
Abstract: PURPOSE:To provide the subject flux wherein an aqueous dextrin solution which has been prepared in a specific viscosity is mixed and added in the flux thereby to apply the solution on the flux uniformly, and further applying a suitable quantity of calcium stearate on the surface thereof thereby to make it possible to carry out effective welding.


Patent
17 Jun 1975
TL;DR: Flux-cored wire for automatic or semi-automatic arc welding process, comporting specific powder compositions as detailed in the description, which are high in amounts of metallic powders, mixed with metallic silicate solution to form a paste and baked before its introduction within a low-carbon or low-alloy steel sheath as mentioned in this paper.
Abstract: Flux-cored wire for automatic or semi-automatic arc welding process, comporting specific powder compositions as detailed in the description, which are high in amounts of metallic powders, mixed with metallic silicate solution to form a paste and baked before its introduction within a low-carbon or low-alloy steel sheath.

Patent
25 Jul 1975
TL;DR: An improved electrode and electrode working tip for a gas tungsten arc welding apparatus is described in this paper, where the face of the working tip is formed as a narrow ring coaxial with the electrode and having an area less than the area of electron emission for the operating currents of the electrode.
Abstract: An improved electrode and electrode working tip for a gas tungsten arc welding apparatus. The face of the working tip of the electrode is formed as a narrow ring coaxial with the electrode and having an area less than the area of electron emission for the operating currents of the electrode. The reduced area of the narrow annular ring forces the area of electron emission to spread to the immediately adjacent walls. The improved electrode working tip provides a more stable and uniform plasma of reduced diameter for improved precision and repeatability in welds which is the ability to consistently reproduce welding parameters. The electrode tip also has a significantly increased working life.

Patent
27 May 1975
TL;DR: In this paper, a lay-down arc welding electrode with improved weld penetration is described, which includes a core wire surrounded by flux, a portion of which has been longitudinally removed or has been otherwise made thinner than the flux surrounding the remainder of the arc wire.
Abstract: A lay down arc welding electrode with improved weld penetration is described. The welding electrode includes a core wire surrounded by flux, a portion of which has been longitudinally removed or has been otherwise made thinner than the flux surrounding the remainder of the arc wire. The direction of arc is adjusted by varying the shapes of core wire and flux. During welding the arc welding electrode rests on a tack weld. This causes directional angle (α) to the root of the weld to increase and the divergence angle (β) to decrease, resulting in improved penetration of disposed metal. An apparatus is described for continuous lay down arc welding using the described arc welding electrode.




Patent
21 Feb 1975
TL;DR: In welding materials, such as a composite electrode enclosing a flux within a tubular hoop, a combination of a solid electrode and a flux, a core electrode coated with a flux and the like, for welding aluminum-coated steel comprising on weight basis less than 1.5% of Si, and 2 to 15% of CaF 2 and 15 to 50% of a mixture of oxides having a basicity ranging from 1.0 to 12.5, the balance being substantially Fe as discussed by the authors.
Abstract: In welding materials, such as a composite electrode enclosing a flux within a tubular hoop, a combination of a solid electrode and a flux, a core electrode coated with a flux and the like, for welding aluminum-coated steel comprising on weight basis less than 1.5% of Si less than 1.0% of Mn, and 2 to 15% of CaF 2 and 15 to 50% of a mixture of oxides having a basicity ranging from 1.0 to 12.5, the balance being substantially Fe.




Patent
17 Jul 1975
TL;DR: In this paper, a slag breaker is used to break up an accumulation of fused flux particles which tend to form a sheet in front of the welding arc which, if permitted to form would block the flux feed into the welding area on the leading side, thus permitting uniform flow of flux to insure complete submergence of the arc in the flux material.
Abstract: The invention relates to an improvement in apparatus for carrying out the submerged arc surfacing of metallic work pieces with metal electrode strips melting in an electric arc while forming welding beads upon the work piece. A slag breaker comprising a series of parallel plate portions disposed substantially perpendicular to the surface of the electrode strip is positioned on the leading side of the electrode strip adjacent the region of the electric arc. The slag breaker serves to break up an accumulation of fused flux particles which tend to form a sheet in front of the welding arc which, if permitted to form would block the flux feed into the welding arc on the leading side. The slag breaker thus serves to prohibit formation of such a sheet and thereby permits uniform flow of flux to insure complete submergence of the arc in the flux material thus minimizing the chance of the arc flashing through the flux burden and resulting in defects in the deposited cladding material.