Showing papers on "Shielding gas published in 1982"

Multiple passage conduit for fume extracting welding gun

Abstract: An improved flexible hose having particular utility for a fume extracting welding gun is described. The hose has a smooth outer surface, an inner cylindrical compartment which receives the power cable and welding wire and a plurality of radial webs which define compartments for extracting fumes and for conveying shielding gas to the welding site.

Method of welding titanium alloy parts with titanium insert

Abstract: A method of welding opposite end surfaces of two titanium alloy parts kept in alignment by a high energy-density welding process such as electron beam welding, laser beam welding or TIG arc welding, characterized by closely interposing an insert member of either practically pure titanium or Ti-Al binary alloy containing up to 3 Wt % of Al. Owing to thorough alloying of the inserted titanium with the constituents of the fused base metal, the weld metal in a weld joint obtained by this method is sufficiently high in both strength and toughness. By an optional postwelding heat treatment, the strength of the weld metal can further be enhanced.

Arc welding gun with gas diffuser and external cooling conduit

Abstract: A welding wire gun operable in the high temperature environment of a high current density welding system. The welding gun includes a tubular member through which welding wire and shielding gas are adapted to pass. A gas diffuser member is mounted upon one end of the tubular member and, in turn, supports a welding tip therein such that the end of the welding tip projects beyond the diffuser in the direction of the joint to be welded. Additionally, the welding gun is constructed to provide for flowing of a coolant material around the tubular member proximate the diffuser member for maintaining the welding tip below its melting or distortion temperature. A tubular nozzle member is supported at one end from the diffuser member and extends beyond both the diffuser member and the welding tip in such a way as to define an annular shielding gas chamber about the diffuser and welding tip. Gas passages formed through the diffuser communicate with the annular gas chamber and are angularly oriented with the central axis of the diffuser and welding tip so as to maximize the velocity and minimize turbulence of the gas flow through the gun to thereby maintain a high energy shielding gas envelope around the welding wire and weld puddle.

Tubular composite arc welding electrode for vertical up welding of stainless steel and nickel-base alloys

Abstract: In a tubular composite electrode for depositing stainless steel or nickel-base alloy weld metal, satisfactory performance in vertical up welding is achieved through the inclusion in the electrode core of a slag mix comprising 15 to 60% weight percent zirconium dioxide.

Hot wire arc welding torch assembly

Abstract: A hot wire welding torch assembly includes a nonconsumable metal electrode 12, a filler metal 6 fed to a weld puddle 11 fomed by an arc 10, a collet body 15 for holding the electrode, a shielding gas nozzle 3, and a torch body 1 molded from a synthetic resin for coaxially mounting the collet body and shielding gas nozzle. A highly dielectric and heat-proof insulating bushing 14 is provided between the torch body and a clamping holder 2 for mounting the torch body 1 to a filler metal torch 4 to prevent any relative slippage between the two torches and avoid electrical shock hazards.

Sleeve-to-tube welder

Abstract: A welding apparatus for internally welding sleeves to tubes comprises a central shaft with an electrode attached thereto which are capable of being inserted in a tubular member. A plurality of remotely actuable seals are disposed on the welding apparatus and around the electrode for establishing a sealed chamber in the sleeve in which the welding may take place. The welding apparatus is capable of supplying an inert shielding gas to the sealed chamber for pressurizing the sealed chamber during the welding process and while the electrode completes a weld around the inner circumference of the sleeve. The apparatus may also be used to internally braze the sleeve to the tube.

Development and Application of Dabber Gas Tungsten Arc Welding for Repair of Aircraft Engine, Seal Teeth

Abstract: Dabber TIG welding can be defined as a modification of an automatic TIG welding system. Modifications, both mechanical and electronic, combine to cause an intermittent filler wire feed to the molten weld puddle. This interrupted action allows for momentary cooling of the weld puddle. Energy input, as heat, for a given time span is reduced by this action. In addition the interruption allows solidification of the puddle with resultant narrow, uniform bead. This weld mode is characterized by shallow heat affected zones and precise weld build up configurations. This paper describes the application of this procedure to Gas Turbine Seals.Copyright © 1982 by ASME

T-joint welding method

Abstract: PURPOSE:To execute T-joint welding which forms stably and uniformly a penetration bed on the left and right, by making the end edge of the second member press-contact with the reverse side of a groove-like groove of the first member, generating an arc on the surface side of the groove, and also providing an alternating field CONSTITUTION:The end edge of the second member 3 is butted so as to be orthogonal to the reverse side of a groove of the first member 1 having a groove-like groove 2, a W electrode 4 and the first member 1 are electrified from a welding power source 5, an arc 6 is generated on the center line Y of the second member 3 on the surface side of the groove 2, and a molten metal 13 is formed by melting a filler rod (omitted in the figure) Also, at the same time, an alternating current is made to flow from a power source 9 to a coil 8 of an enameled copper wire, etc wound to a torch body 7, protecting a weld from the air by making shield gas 10 of inert gas flow, an alternating field being orthogonal to a welding current is formed, the molten metal 13 is rocked and stirred, and a T-joint weld having a uniform penetration bed is formed on the left and right leg parts by a solidified weld metal 14

Method for detecting reflected light amount of laser beam

Abstract: PURPOSE:To detect reflected beams in a maximum reflected light region and realize an excellent welding position detection, by detecting reflected beams of a laser beam from a welding position with a light receiving mirror and photoreceptor sensor, both of which are installed in a welding head CONSTITUTION:An He-Ne laser beam 4 for detecting welding position is oscillated in addition to a CO2 laser beam 2 for welding by overlapping the laser beam 4 upon the laser beam 2, and the laser beams are irradiated upon an object to be welded 10 through a condenser lens 8 and folded mirror 6 The reflected amount of the above mentioned He-Ne laser 4 is detected by a photoreceptor sensor 12 through a light receiving mirror 14 and small-sized lens 15 installed in the space between the condenser lens 8 and folded mirror 6, and a welding head is oscillated in the left-right direction with a welding groove 13 at the center, and thus the welding position can be easily judged by a minimum amount of reflected light At the time of welding, the light receiving mirror 14 can be retracted from the optical path by bringing up the bodytube 16 of the photoreceptor sensor 12, and, moreover, influence of weld fume is minimized because a welding shield gas 17 is supplied into the welding head 7

Dc arc welding machine

Abstract: PURPOSE:To permit drawing out of stored data by inputting of kinds of shilding gases and wire diameters by a using the kinds shielding gases and wire diameters as parameters and determining the storage area of the welding conditions wherein the electric current and voltage at the welding are made one set CONSTITUTION:An output voltage control circuit 3 rectifies AC input and applies the DC voltage of the assigned voltage value of an arithmetic control circuit 9 to an arc part A wire control circuit 4 also controls the feed speed of a wire with the voltage or current of the assigned current value of the circuit 9 The circuit 9 receives the reference welding voltage and current set in output voltage and current setting circuits 10, 11, makes operation with the kinds of shielding gases, the diameters of wires, the thickness of welding materials, etc and stored the data obtained by the operations On the other hand, it outputs control voltage value and current value respectively to the circuits 3, 4 Said kinds of the shielding gases and the diameters of the wires are so selected and set as to conform always to the kind of the gas and the diameter of the wire currently set by respective selection circuits 15, 16, and the these are inputted to the circuit 9

High-power laser and arc welding of thorium-doped iridium alloys.

Abstract: The arc and laser weldabilities of two Ir-0.3% W alloys containing 60 and 200 wt-ppm Th have been investigated. The Ir-0.3% W alloys doped with about 60 wt-ppm Th are used as post-impact containment material for radioactive fuel in thermoelectric generators that provide electrical power for outer planetary missions. 18 refs.

Automatic contactless torch guidance along the seam centre line during shielding-gas arc welding

Abstract: In this burner guiding the arc (10) as a sensor for automatically, using contactless welding technique to joint center, with resulting viewed during welding via the weld (11) the light intensity distribution (14, 15) of the light / plasma arc (10) as a control / regulating variable for the movement of the welding torch (1) is used. Extending through the horizontal and vertical deviation of the course of the welding torch (11) resulting asym metrical incident light intensity (16, 17, 18, 18a) controls / regulates the Brennernachfuhrung.

Gas shielded welding torch

Abstract: PURPOSE:To provide a gas shielded welding torch which can eject shielding gases at a high velocity and can weld inside surfaces having small clearances by fixing a shielding plate inserted with a wire guide to the wire guide near the preceding end in a gas cup and providing flow passages passing through the inside and outside of the gas cup. CONSTITUTION:The shielding gases to be supplied into a gas cup 1 is accumulated to high pressure in a gas chamber 8, and are ejected at a high velocity to materials 6 to be welded through an annular nozzle 4 or the nozzle 4 and nozzles 4'. In this case, the shielding gases are ejected as cylindrical laminar flow accurately at a high velocity to around the preceding end of a welding wire 5 unlike in the prior art; therefore, the biased flow of the shielding gases or the inclusion of air is obviated. More particularly, in the case in which the shielding gas is ejected from the nozzle 4 and the nozzles 4', double shielding is provided with the cylindrical shielding gas, whereby weld beads are shielded thoroughly. Since the shielding gases are ejected at a high velocity, sticking of spatters on the gas cup 1, etc. in the stage of welding is prevented.

Method and device for laser welding

Abstract: PURPOSE:To obtain a defectless weld zone having no welding defect such as porosity, by receiving the laser beam irradiated on a material to be welded through a condenser lens with an oscillating reflecting mirror and welding the material while oscillating the focal position thereof in the weld line direction. CONSTITUTION:A laser beam 2 is irradiated through the 1st reflecting mirror 10, a condenser lens 11 and the 2nd reflecting mirror 12 together with a shielding gas to a material 1 to be welded. The mirror 12 is mounted on a holder 13 which is pinned freely turnably to a frame 14. A lever 15 is pinned freely rotatably to the frame 14, and the lever 15 is oscillated by the effect of an eccentric disc 17 and a spring 19 attached to the frame 14. The oscillation thereof is transmitted with a push bar 16 to the holder 13 and the reflecting mirror is oscillated in the direction of the arrows by said oscillation cooperatively with a spring 18 whereby the pierced hole 16 in the molten pool is elongated long in the weld line direction and the generation of porosity is prevented.

Highly tenacious ac mig welding method

Abstract: PURPOSE:To obtain a welding metal superior in tenacity at a low temperature, by making prescribed conditions for the shield gas composite consisting essentially of inert gas and the combination of wire components. CONSTITUTION:A shield gas atmosphere is obtained by mixing 0.5-20% carbonic acid gas and/or 0.1-5% oxygen and rest inert gas. A steel wire having component parameters 0.7-1.9% P, 0.005-0.15% Ti, 0.0005-0.015% B, 0.01- 0.3% C, <=0.6% Si, <=2.5% Mn, and rest Fe which satisfy expression is used. Welding is performed with a welding current of AC 150-1,500A. Thus, a welding metal superior in tenacity at a low temperature is obtained.

Gas shielded arc welding method and multiple gas shielding nozzles

Abstract: PURPOSE:To reduce the usage of a costly shielding gas by maintaining the shielding gas dynamic pressure from an inner nozzle higher than the shielding gas dynamic pressure from an outer nozzle in performing gas shielded welding of Al or the like by using multinozzles. CONSTITUTION:In gas-shielded welding of Al or Al alloys, the multinozzles constituted of an inner nozzle 1, an outer nozzle 2 or further an outermost nozzle 3 are used. A welding tip 4 is provided in the nozzle 1, and the leading end part of the nozzle is sliced in a direction of intersecting obliquely at an angle theta with the axial centers of the tip 4 and an electrode 8 at the leading end thereof. The nozzle 3 is made rotatable, and movable forward and backward. In welding, gaseous He which is high in potential gradient of arcs but is costly is ejected from the nozzle 1 and gaseous Ar which is inexpensive and is low in arc potential gradient from the outer nozzle. The costly gaseous He is effectively utilized for shielding, and the large-current large-heat input welding is accomplished with the less use of the gaseous He.

Pulse arc welding method

Abstract: PURPOSE:To enhance the stability of globule migration and improve welding work by detecting the timing for flying of a globule from a consumable electrode, and controlling pulse current supply time in such a manner that the migration of the globule takes place in the pulse current supply time. CONSTITUTION:A device of performing the above-described pulse arc welding is constituted as follows: The above-described device is constituted of a consumable electrode 7, the arc 9 generated between the electrode 7 and materials 10 to be welded, a shielding gas 8, a reference time generator 12, etc. When the voltage of the arc 9 is first detected, the waveform shown is obtained and therefore this waveform is shaped and controlled, whereby the timing tau for detaching of a globule from the electrode 7 is measured with a measuring device 13. Next, the time tau for detaching of the globule and a pulse current supply time Tp are compared in a comparator 14 and a pulse welding source 6 is controlled with a regulator 15 so that the pulse current supply time is Tp when tau Tp.

Welding machine for producing titanium tubes - under an inert gas shield, e.g. of argon

Abstract: Titanium tubes are welded from rolled sheet under an inert gas shield The equipment comprises a table with a lengthways slot A carriage straddles the slot forming a gas holding enclosure It also carries the welding torch, its nozzle close to the slot A longitudinal support holds the rolled sheet against the underside of the table The edges to be welded are aligned with the slot The shielding gas, eg argon, is piped to the hollow centre of the support and passes into a groove below the joint Two lips, fixed to the underside of the table, pinch the sheet against the edges of the groove, to prevent escape of gas This type of welding is frequently carried out in an evacuated chamber, to which argon gas is introduced For long lengths the equipment described is more economical, and uses less gas

Wire for welding of cr-mo type heat resisting steel

Abstract: PURPOSE:To obtain weld metal which is good in welding workability and is good even after the heat treatment by specifying the composition of a wire for narrow gap welding to be accomplished while oscillating an electrode with a shielding gas consisting of Ar and CO2. CONSTITUTION:A shielding gas is a mixture of Ar and 10-25% CO2, and while an electrode is oscillated in both end directions of a groove at <=15mm. groove spacing, Cr-Mo type heat resisting steel is welded. The composition of a wire for welding used is specified to contain essential components of by wt% <=0.095 C, <=0.50 Si, 0.40-0.90 Mn, <=0.30 Cu, 2.20-2.60 Cr, 0.90-1.20 Mo, <=0.04 V and <=0.008 Sn+Sb+As, <=0.010 P, <=0.015S and, if necessary, <=0.006 B and the balance substantially Fe. If the wire of such component range is used, welding workability is improved, and besides the weld metal of good tensile strength, impact value and annealing embrittleness sensitivity is obtained.

Flux cored wire for submerged arc welding

Abstract: PURPOSE:To perform welding with easy start of arc and high stability of arcs at a high rate of deposition by using a flux cored wire of a specific compsn. contg. stainless steel powder in submerged arc welding of stainless steel. CONSTITUTION:A flux of the following compsn. is packed in a stainless steel hollow wire of the same material as the stainless steel to be welded as a flux cored wire to be used in submerged arc welding of stainless steel: A flux which contains 0.5-20% 1 or >=2 kinds among rutile, ilmenite and zircon sand by weight of the wire, 0.05-3% 1 or >=2 kinds among potash feldspar, silica and wollastonite, 0.2-5% 1 or >=2 kinds among calcium carbonate, lithium carbonate and barium carbonate, 0.3-2% fluorides such as CaF2 and wherein stainless steel powder is so mixed at <=25% ratio that weld metal and the materials to be welded have the same compsn.

Electric power source for welding

Abstract: PURPOSE:To provide an electric power source for welding which is easy to operate and provides welding results of high quality by so constituting the same that the output in the stage of crater welding is operated automatically from the output in the stage of welding and can be set. CONSTITUTION:The set inputs in a setter 10 for setting welding outputs and crater welding outputs are inputted to an arithmetic circuit 15 via an input circuit 14. In the circuit 15, the states of welding and crater welding are discriminated and in the case of the crater welding, the crater welding output relating to the welding output is operated and outputted by the processing stored in the storage part in the circuit 15. The voltage of the crater welding is set by the output current in the stage of the crater welding determined by the circuit 15 by referring to the kinds of welding materials, the kinds of weld shielding gases and the diameters of welding wires by switching elements 11-13. The voltage value suited for the crater welding current is fetched from the storage part and is inputted to an output circuit 16. As a result, the output in the stage of the crater welding is obtained automatically from the output in the stage of welding. Here, 17 in the figure denotes the controlling element for the welding output.

Sequence controlling circuit for arc welding

Abstract: PURPOSE:To obtain a controlling circuit that can change over welding conditions in a short time by providing >=2 discharge routes for a capacitor, amplifying the electric current flowing in one of them with a transistor, and flowing large discharge current in the other route on account of this amplification thereby reducing the discharge time of the capacitor. CONSTITUTION:This circuit consists of the 1st relay 2 connected to a DC electric power source 1, and controlling the supply of welding current between an electrode and the work, the 2nd relay connected to the power source 1, and controlling feeding of a welding wire, the 3rd relay 8 connected to the power source 1 and controlling the changeover of welding conditions and crater welding conditions, a current detecting relay for the current between the electrode and the work, a solenoid valve 10 for controlling the supply of shielding gas, a trigger switch 4 connected to the 2nd relay and controlling a sequence control timing, a capacitor 16 connected to the 3rd relay, a discharge resistance 17 and a transistor 31 connected to each of the 1st and 2nd discharge route of the capacitor and a charge resistance connected to the charge routes.

Method for surface hardening of titanium or titanium alloy

Abstract: PURPOSE:To enhance anti-wear property of a titanium surface by ionizing nitrogen in plasma arce by using a plasma torch capable of flowing a shield gas to react with a molten part of a titanium base material. CONSTITUTION:By using a plasma torch 1, from a operating gas passage 3, an inert gas, for example, an argon gas or a gas obtained by mixing 30% or less nitrogen in said argon gas is flowed and, from a shield gas passage 6, an inert gas, for example, a mixed gas of argon and nitrogen for preventing oxidation of a titanium of a titanium alloy material 7 is flowed. Then, plasma arc 9 is generated between an electrode 4 and said base material 7. By generating the arc 9, a surface of the base material 7 is heated and, further, melted. At the same time, nitrogen in the shield gas is ionized by the arc and the resultant nitrogen ion infiltrate into and diffuse throughout said base material to generate hardening reaction thereof.

Corona discharge treatment of plastic formed product surface

Abstract: PURPOSE:To effectively perform titled treatment without requiring any large equipment and a large quantity of a shielding gas, by blowing at a specific speed a mixed gas with a composition other than that of the air on the corona discharge-treating surface of a plastic formed product. CONSTITUTION:For example, a plastic film 6 is fed from the direction of B to the metal drum 1 revolving in the direction of A, and is drawn out in the direction C. Along with shielding from the air the entire corona-discharged space containing the discharge electrode 3 using a cover 2, while providing the electrode 3 with a gas ejecting exit 5 and blowing an inert gas (e.g., N2, CO2) on the film surface through a gas-feeding tube 4 to replace the ambient air by the inert gas, a high-frequency voltage is applid between the electrode 3 connected to a high voltage generator and the drum 1 covered with the film 6 such as of polyester, thus performing the objective corona discharge treatment.

Method and device for monitoring welding in gas shielded arc welding

Abstract: PURPOSE:To detect the inclusion of air into an arc part directly, accurately, and quickly by detecting the intensity of the spectral lines of nitrogen in particular released from the arc. CONSTITUTION:The intensity of the nitrogen spectral lines of the specific wavelength region where detection sensitivity to air inclusion is high released from the welding arc is detected with the intensity of the background lines near the same or the intensity of the spectral lines of the arc constituting components as a reference. If this welding arc is a TIG arc, the peak line and the like of a shielding gas are used. Thence, said detected value is compared with the preset reference value, whereby the air inclusion into the arc part is detected directly, accurately and quickly. It is preferable to detect the intensity of the nitrogen spectral lines particularly in terms of a ratio with the background value near the wavelength thereof or the intensity value of the spectral of the arc constituting components as a reference. Out of the spectral lines of N, the wavelength region near 4630.6Angstrom or 5679.6Angstrom is optimum because there are less disturbing lines and the intensity is higher than the spectral lines of other wavelength regions.

Gas shielded electric welding torch - having integral mounting head with fuse extraction openings

Abstract: The gas shielded electric welding torch has an external fume extn. housing enclosing a swan-neck, the end of which is provided with a diffuser and a shielding gas nozzle enclosing a contact tube which form an extension of the welding wire guide tube extending through the swan-neck. The swan-neck nozzle and housing are assembled together by an annular head with a series of openings through which fumes can be drawn into the housing from outside the torch. The provision of a solid, fume extraction head simplifies the MIG torch construction and allows a slender tapered torch and to be provided to facilitate welding operations.

Welding wire for cr-mo type heat resistant steel

Abstract: PURPOSE:To provide a titled welding wire having good welding workability when used in narrow groove welding by contg. C, Si, Mn, Cr, Mo and Ti as essentially components and further >=1 kinds of V, B and Ce, as well as Sn, Sb, As, P and S. CONSTITUTION:A welding wire for Cr-Mo type heat resistant steel for narrow groove welding to be accomplished by using Ar contg. 10-25% mixing ratios of CO2 as a shielding gas, and welding while oscillating an electrode in both end directions of the groove at =1 kind of <=0.04% V, <=0.06% B and <=0.07% Ce are contained other than the above-mentioned composition, and the sum of Sn+Sb+As is specified at <=0.00%, P at <=0.010% S at <=0.010%, and the balance is constituted of Fe. By this welding wire, the weld metal having superior performance after heat treatment is obtained.