Method of hybrid laser-arc welding

FIELD: technological processes.

SUBSTANCE: forming the weld pool by at the same time an electric arc and a laser beam by melting the metal of the filler material in a protective medium consisting of inert and active components. Argon is used as an inert component. The filler material is used in the form of two consumable wires with diameter up to 1.6 mm, which, together with a protective medium, are supplied from a single nozzle. Filling of the outer part of the cutting of edges is carried out by simultaneously melting the wires of a predetermined volume with the formation of an outer roller.

EFFECT: invention makes it possible to increase the productivity of the laser-hybrid welding process, reduce the defects in the formed weld, and improve its mechanical properties.

2 cl, 1 dwg

 



 

Same patents:

FIELD: machine building.

SUBSTANCE: module comprises a guide belt, a movable orbital carriage mounted on the guide belt and able of travelling along it. The carriage includes a longitudinal movement drive and a moving device consisting of a carrying roller system and a gear wheel. A joint monitoring sensor, a welding wire reeling device and a handler are installed on the carriage. The handler consists of two mutually perpendicular linear guides with motors, which can move in respect to each other. The transverse linear guide is equipped by a laser welding head, a wire feeding unit, an arc welding torch, a video camera and a controller.

EFFECT: invention allows for the increase of productivity and efficiency of welding process for fixed ring pipe joints and for the improvement of welded joint quality.

3 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to welding apparatus and method of arc welding with consumable wires. This apparatus comprises first tubular current feeder (2) to direct first consumable electrode (4) to weld pool (6) and to feed welding current to first consumable electrode (4) and second tubular feeder (10) to direct second consumable electrode (12) to said weld pool (6) and to transmit welding current to second consumable electrode (12). One power supply (16) is connected to said first and second tubular current feeders (2, 10) to create equal voltage at said electrodes (4, 12).

EFFECT: higher efficiency and quality.

19 cl, 8 dwg

FIELD: transport.

SUBSTANCE: invention relates to mechanised arc welding by consumable electrode in atmosphere of protective gases. Protective gas is forced through union and injector axial channel into mixing chamber. Rarefaction is developed in the channel between said mixing chamber and header to suck in nanostructured powders from aid header. Protective gas forces powder fed via arc into molten pool. Addition of nanostructured powders to molten pool creates extra centers of crystallisation of weld seam metal microstructure grains formation.

EFFECT: longer life and higher reliability of weld joints.

1 dwg, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to welding wire from stainless steel with flux core for welding zinc-coated steel sheet. Said wire comprises shell from stainless steel filled with flux. Total content of elements introduced in the form of metals or alloys into said shell and said flux, relative to total weight of welding wire, makes, in wt %: C - 0.01-0.05, Si - 0.1-1.5, Mn - 0.5-3.0, Ni - 7.0-10.0, Cr - 26.0-30.0, Fe and unavoidable impurities making the rest. Magnitude F defined the formula given below makes 30-50, F = 3×[Cr%] + 4.5×[Si%]-2.8×[Ni%]-84×[C%]-1.4[Mn%]-19.8 , where [Cr%], [Si%], [Ni%], [C%] and [Mn%], respectively, define total content of Cr, Si, Ni, C and Mn in wire shell and welding wire relative to total weight of the wire. Note here that said flux comprises the following slag-forming materials in wt % with respect to wire total weight: TiO2 - 3.8-6,8%, SiO2 - 1.8-3.2%, ZrO2 - 1.3% or smaller, including 0%, Al2O3 - 0.5% or less, including 0% and total content of said slag-forming materials makes 7.5-10.5%, note here that content of TiO2 makes 50-65% with respect to total weight of slag-forming materials.

EFFECT: ruled out cracking of weld seam, higher hardness and elasticity.

5 cl, 6 dwg, 5 tbl, 2 ex

FIELD: process engineering.

SUBSTANCE: invention relates to mechanised hidden-arc welding by consumable electrodes in atmosphere of protective gases with continuous feed of welding wire. Proposed method comprises welding at continuous feed of welding wire with application of elastic lengthwise vibrations of ultrasound frequency. Lengthwise vibrations are transmitted to electrode metal drop. Said drop is located at welding wire end. Detachment of electrode metal droplet is caused by resonance.

EFFECT: increased drop transfer rate, metal mechanical properties of weld seam, decreased electrode metal sputtering.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to assembly of box-like structures for welding at specialised devices. Proposed method comprises mounting and locking the opposed cover frame and box bottom. Then, corrugated walls are plaid on surfaces of said cover and bottom. Then, two edges are subjected to contact tack welding to produce weld points on both sides of corrugation. Weld points are made at corrugated wall edges adjacent to cover frame and box bottom.

EFFECT: higher quality of welded joints, welding efficiency, lower costs.

FIELD: process engineering.

SUBSTANCE: set of invention relates to arc welding by consumable wire. Proposed method comprises feeding wire at the rate adjusted in compliance with measured electrical parameters in arc space. During sharp voltage drop in said arc space, it is bridged for short interval by controlled power switch located in area closer to welding head while at abrupt voltage rise in said space, wide feed rate is decreased in discrete steps to bridge said gap by said switch. After breaking said switch, wire feed rate is resumed. Proposed plant comprises welding head, power supply, control system with gap space electric parameters transducers and wire feeder. Controlled power switch is arranged parallel with arc space and connected to control system whereto connected is wider feeder that allows varying feed rate in discrete steps and resuming it in response to signals of electric parameter abrupt variation in dap space.

EFFECT: higher welding quality, high welding speed.

3 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: filtering capacitor is connected to outputs of DC source. Switching capacitor is connected by means of top cover to positive sign of DC source and by means of bottom cover through charging choke to anode of charging thyristor the cathode of which is connected to negative sign of the above source. Switching thyristor is connected by means of cathode to bottom cover of switching capacitor and charging throttle and by means of anode to anode of power thyristor. Switching thyristor is connected with one end to positive sign of the above source and with the other end to anodes of power and switching thyristor. Positive sign of current source is connected to the second contact tip through which welding current is supplied at pause to electrode wire. Section of electrode wire between contact tips is connected parallel to switching throttle, power thyristor and throttle. Device implements welding with controlled transfer of electrode metal.

EFFECT: high efficiency owing to use of heat released as a result of current limitation of the pause for melting and pre-heating of extension of electrode wire, which will allow reducing heat inputs to weld joint.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to automatic electric arc welding. Gap is set between butts of rails to be wedded together. Strip is arranged below gap between rails to be filled with filler metal using relevant crystallisers. Filler metal feed rate is controlled by computer during welding. Said strip is made from electrically conducting material. Filler metal represents solid or powder wire and consumable electrode with nonconducting coat with length equal to height of welded rails plus 30-100 mm and with channel to direct said wire. In welding, said electrode is not moved in vertical direction. Said electrode is oscillated across said gap, reciprocates along said gap and oscillated nearby rail foot and head. Said gap is filled with filler wire metal, electrode and its coat metal in zone of rail foot, neck and foot.

EFFECT: efficient method of arc welding.

9 cl

FIELD: process engineering.

SUBSTANCE: invention relates to automatic welding hardware and may be used in laying oil, gas or water pipelines. Proposed apparatus consists of, at least, one carriage supporting, at least, one welding head that allows directed travel of consumable welding electrode along plane (P) of tube joint and feeds current to wire electrode end to generate welding arc and melt filler metal. Welding head comprises, at least, one torch 1 to provide for penetration that may be centered relative to joint plane (P), and, at least, two other supplementary torches 2, 3 to make lateral passes. Torches 2, 3 are arranged one after another behind the first central torch 1 and shifted to both sides from said central torch 1.

EFFECT: possibility to weld thin-wall beveled-edge pipes together by consumable electrode.

11 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to welding of aluminium alloys. Invention can be used in ship building, aircraft engineering, and rocketry, etc. X-like profile of welding edges is formed to perform multipass welding with weld thickening. Every edge comprises central linear section connected by arc-like sections with inclined linear external sections. Arc-like section is curved to radius R=(0.30÷0.50)β, while central linear section is shaped to c=(0.05÷0.10)β, where β is welding edges depth.

EFFECT: higher static strength and fatigue strength of welds.

4 dwg, 3 tbl

FIELD: metallurgy.

SUBSTANCE: temporary beads 3 and 4 are made on thick 2 and thin 1 parts. The bead 3 height is by 3-4 times higher than thickness of part 1. Height of bead 4 is equal to height of bead 3. Bead 4 thickness is determined by equation S2=(1+Δ)·S1. Beads 3 and 4 contact surface is treated by ultrasound in ethyl alcohol. Parts 1 and 2 are secured in welding fixture. Butt joint gap and beads 3 and 4 shift at least 10% of part 1 thickness are ensured. Laser beam 5 is directed to butt joint of beads 3 and 4.

EFFECT: invention increases weld strength due to rational design of the temporary beads.

3 cl, 4 dwg

FIELD: metallurgy.

SUBSTANCE: aluminium steel joint is obtained by fusion welding of a transient two-layered aluminium steel-element with elements from the same materials by fillet welds. Welding is performed with incomplete penetration of each of the layers of the transient element. Legs of the welds adjacent to the transient two-layered element are at least 1.5 and not more than 2.0 of its thickness on the side of the aluminium layer and at least 1.0 and not more than 1.5 of its thickness on the side of the steel layer, and the weld leg adjacent to the aluminium element being welded is within 1.0 to 1.5 of the value of the weld leg adjacent to the aluminium layer of the transient element.

EFFECT: method allows excluding the formation of delaminations at the boundary of the layers of the aluminium-steel element and provides the achievement of fatigue strength and operating reliability of weld joints.

2 dwg, 1 ex, 2 tbl

FIELD: metallurgy.

SUBSTANCE: first, a shell with an outside end thickening of a cylindrical shape and a spherical bottom of a variable cross section is made of an O-bar of high-strength steel like SP-28 or VP-30 of a rolled plate. A reinforced throat is made from carbon steel 35. The thickness of a weld edge of the throat is chosen in the ratio of 2:1 to the thickness of the shell weld edge. The structure is assembled in a welding and assembly device with a removable pad so that the coincidence of axes and an annular manufacturing clearance at the butt, which is equal to 0.10…0.16 of the thickness of the shell weld edge, is provided. Gas-shielded welding is performed.

EFFECT: invention provides the quality of the weld joint from dissimilar steels and the uniform strength of the weld joint.

7 cl, 10 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of large-sized structures of molybdenum and its alloys, for example, at welding of shells of high-temperature gas-static muffle shields. Structure sheet edges are trimmed and formed. T-like copper insert is fitted between trimmed edges to the clearance there between to comply with leg depth. Trimmed edges are welded together by electron beam at incomplete penetration over the height. Welding is performed by repeated heating of non-penetrated trimmed edges with filling of said clearance with said copper insert.

EFFECT: decreased brittleness of the structure.

3 dwg, 2 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to welding of overlap joints and can be used in power production, motor production, ship and railway car building. Power supply is connected. Plasma-forming protective gas is fed. Arc is excited at top element to penetrate both elements. Note here that top element features higher density that that of lower element metal. Depths of top and bottom elements are related as 1:3. Note also that elements are assembled to overlap by at least tem depths of bottom element while welding time is set (2…4)δ seconds where δ is total depth of the elements, mm.

EFFECT: reliable weld.

FIELD: medicine.

SUBSTANCE: device for making stents comprises a core and a sleeve. The core has a rigid and substantially cylindrical outer surface. The sleeve surrounds the core and has a variable inner diameter. The sleeve has a rest inner diameter. The core has an outer diameter. The rest inner diameter is less than the outer diameter. That provides extending the sleeve when fitting the core, and substantially placing it back to the inner rest diameter after the core is removed. According to the second version of the device for making the stents, the sleeve has a variable rest diameter and a working diameter. The working diameter is less than the rest diameter. The sleeve surrounds the core and contacts thereto, when the sleeve obtains the rest diameter. An auxiliary unit for making the stents comprises the sleeve having the inner diameter and configured to extend from the rest diameter to the working diameter after applying the expansive force. The working diameter is more than the rest diameter, which the sleeve has at rest. The sleeve is configured to place back to the rest diameter after the expansive force is removed from there. A method for making the stent by means of the device for making the stents according to the first version providing contacting the sleeve to the core for fastening the sleeve on the core. That is followed by contacting the sleeve to a metal relief sheet. The above sheet is then wrapped about the device, and the sheet ends are welded up to form the stent.

EFFECT: invention provides the protection of the upper surface of the stent during the making process.

30 cl, 9 dwg

Arc welding method // 2530104

FIELD: machine building.

SUBSTANCE: welding method consists in two-sided simultaneous fusion of opposite sides of a joint. The parts being welded are installed in a horizontal plane. Grooving with bevels and noses of 8-12 mm is carried out. One welding electrode is installed at each side of the joint, the said electrodes are shifted in respect to each other in longitudinal direction. The distance between the electrodes is chosen as equal to 1.0-1.5 of the weld pool length of the front arc. Powers of the welding arcs are regulated separately at each electrode. The travel speeds of the welding electrodes and the arcs are equal. Welding in overhead position is carried out on the side of the edge nose by means of a non-consumable electrode which is set ahead in respect to the direction of the welding path. The speed and power of a welding arc are chosen so that to provide for 25-35% penetration from the nose of the bevelled welded edges. Flat-position welding is carried out on the side of the edge nose by a consumable electrode. The power of a welding arc at flat-position welding is chosen so that to provide for 85-75% penetration from the nose. The diameter of the consumable electrode is chosen so that to provide for maximal filling of grooving cross section.

EFFECT: reduction of expenditures on additional material at welding and improvement of welding efficiency.

7 dwg

FIELD: metallurgy.

SUBSTANCE: proposed method comprises making of backing of allowance of one of the parts. Said backing is removed at machining after butt welding at vertical position of the beam. Backing depth and width equal 0.25-0.35 and 0.10-0.15 of butt depth, accordingly. Mark 0.004-0.006 of butt depth is made on back of backing opposite the butt to evaluate visually the absence of bridging by smelting rate.

EFFECT: high-quality weld.

2 dwg

FIELD: metallurgy.

SUBSTANCE: this method comprises machining of edges to make the skews over pipe or sheet with 2-3 mm circular transition to plating layer and nose from plating layer in the form of rectangular ledge. Skew of edges over pipe or sheets to nose is broken at angles of 1-2 and 4-8 degrees. Nose from plating layer is 2.5-3.5 mm high and 3.4-4.7 mm long. In compliance with second version, method comprises machining of edges to produce skew with nose over pipe or sheet and bore with skew on plating layer side to depth larger than thickness of the latter. Skew of edges over pipe or sheet to nose features angle of 1-2 degrees. Nose is shaped to rectangular ledge and is 1.8-2.3 mm high and 3.2-5.2 mm long while bore features skew angle of 52-57 degrees.

EFFECT: lower material input, simplified design of welding set, higher quality of weld.

3 cl, 2 dwg

FIELD: machine building.

SUBSTANCE: module comprises a guide belt, a movable orbital carriage mounted on the guide belt and able of travelling along it. The carriage includes a longitudinal movement drive and a moving device consisting of a carrying roller system and a gear wheel. A joint monitoring sensor, a welding wire reeling device and a handler are installed on the carriage. The handler consists of two mutually perpendicular linear guides with motors, which can move in respect to each other. The transverse linear guide is equipped by a laser welding head, a wire feeding unit, an arc welding torch, a video camera and a controller.

EFFECT: invention allows for the increase of productivity and efficiency of welding process for fixed ring pipe joints and for the improvement of welded joint quality.

3 cl, 3 dwg

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