Method of laser-arc welding of vertical joints of thick-sheet steel structures

FIELD: technological processes.

SUBSTANCE: invention relates to a method of laser-arc welding of thick-sheet steel structures and can be used in various industries. Hybrid laser-arc head is used. Arc burner is located in front of laser beam in the direction of its movement, grooving is made in X-shap, opening angle of which does not exceed 20° at each side, and nose ranges from 40 to 50% of the blank thickness. Node of X-shaped grooving is welded in one pass on all nose sections, when hybrid laser-arc welding head moves from top to bottom with the laser beam located perpendicular to the section of connection zone surface. Further filling at each side of grooving is made with transverse oscillations of laser-arc head.

EFFECT: high quality of welded joints due to increased strength, absence of lack of fusion and reduction of thermal influence zone size.

1 cl, 1 dwg

 



 

Same patents:

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: process engineering.

SUBSTANCE: invention relates to cutting of fragile nonmetallic materials, for example, quartz glass, etc. Proposed method comprises making a local notch at workpiece edge in cutting line, heating the latter by laser beam and cooling it by coolant at relative displacement of material and laser beam with coolant. For cutting, workpiece is heated by laser beam before making said notch to be made in laser beam zone or immediately there behind. Notch is made at relative displacement of workpiece at the rate v with time delay with respect to beginning t of heating by laser beam defined by equation t=Ask/v where A is half the elliptic beam in direction of displacement or round beam radius, k varies from 1 to 2.5.

EFFECT: expanded possibilities owing to application of LUT cutting method.

1 tbl, 5 dwg

FIELD: metallurgy.

SUBSTANCE: device comprises source 3 to form heat feed zone 11 on part surface 10, device 5 to feed welding filler 13 into said zone 11 and device 15 to displace heat source 3 and filler feed device 5 relative to part surface 10. Control unit 17 with control program controls displacement so that welding power and heat feed zone diameter are set to ensure cooling rate of at least 8000 K per second at material crystallisation. Depth of remelting previous layer is set proceeding from the condition of formation of polycrystalline weld seam.

EFFECT: rules out cracks.

14 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and may be used in welding different materials by laser radiation. Plane of but joint between said parts is inclined along tangential line to segment of welded seam thermal effect. Laser radiation is focused to material with higher heat resistance at a distance from butt plane. But joint plane inclination angle and focus distance are determined with due allowance for inhibiting evaporation of low-melting metal. Laser radiation is fed onto welded surfaces to heat welding zone to melting temperature to produce, thereafter, a welded seam.

EFFECT: possibility to weld different metals together.

3 dwg

FIELD: electricity.

SUBSTANCE: method includes fixation of polarised flat piezoceramic plate and cutting with laser beam. Fixation is carried out in cuvette on surface of cooling liquid or on gasket from porous material impregnated with cooling liquid, amount of which is maintained at the level of gasket. Cutting is done by focused interrupting laser beam along circuit of cut item in one or more stages with simultaneous cooling of cutting circuit. Device comprises laser, control system, mechanisms of optical elements moving, technological table with cuvette of soft magnetic material installed on it and partially filled with water, on bottom of which there is a porous material intended to locate cut flat piezoceramic plate, and fixation device of specified plate.

EFFECT: simplified technology of manufacturing of flat piezoceramic items of various configuration and dimensions and improvement of their properties and parametres due to provision of usage of whole surface of piezoelement.

7 cl, 3 dwg

FIELD: technological processes.

SUBSTANCE: invention may be used for creation of different single crystal processing tools, medical tools, for creation of electric contacts with metal on the surface of semiconductor and other diamonds. Preliminarily surface of diamond single crystal is polished to 5th class of roughness (according to state standard GOST 2789-73) and degreased. Degreased surface of diamond single crystal is coated with intermediate layer with thickness of 0.05÷0.4 mm from mixture of nanodispersed powders of ferric oxides with size of particles of 20÷40 nm and fullerene C60. Ratio of ferrous oxides content to fullerene C60 makes 10-50:90-50 wt %. Then place of contact is exposed to pressure of 2.0÷5.0 GPa and simultaneously to shift effect by rotation at the angle of 100÷1000 degrees.

EFFECT: higher strength and quality of diamond single crystal binding to metal.

3 cl, 3 ex

FIELD: physics; lasers.

SUBSTANCE: present invention pertains to laser technology, particularly to the method of cutting pyrographite using laser, and can be used in instrument making, and mainly in electronics. Laser radiation with central mode TEM00 is focused on the material. The focus of the beam is directed on the surface of the material, while keeping the density of the incident power within the 106-107 W/cm2 range. The work piece is moved at speed ranging from 1 to 3 mm/s. The cutting process parameters are determined by the expression , where K is the coupling factor of parameters, chosen from the condition 7·10-5≤K≤12·10-5; f is the repetition frequency of the laser radiation, τ is the pulse duration of the laser radiation, d is the diameter of the spot of focused laser radiation, and h is the thickness of the work piece. A laser with yttrium aluminium garnet active element, with controlled distribution of power in the section of the beam is used.

EFFECT: high quality of cutting material with a smaller heat affected zone during optimum process modes.

2 cl, 1 ex

The invention relates to wear-resistant and optimized tribological working surface of the cylinder

FIELD: process engineering.

SUBSTANCE: invention relates to production of steel sheet articles from different-depth steel sheet or strips. Billets are welded together along the butt to get the weld (7) composed by edges of steel sheet or strip workpiece. To rule out loss of quenched structure produced by heating to austenitising temperature, at least one edge of sheet or strip (8, 9) is coated before welding with thick fluid or solid powder or aerosol-like matter including at least one component increasing the strength of the weld (10).

EFFECT: higher weld strength.

28 cl, 2 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to machine for production of polar plates by laser cutting. This machine comprises bed, laser cutting assembly, cutting manipulator to drive laser cutting assembly, control system and at least one strip feeder. Strip feeder comprises manipulator for gripping, means for strip feeding to preset length and strip release means. Cutting and gripping manipulators are arranged at the bed. Means for strip feeding to preset length is arranged between gripping manipulator and strip release means. Control system is connected with cutting manipulator, gripping manipulator and means for strip feeding to preset length.

EFFECT: production of plates for lithium-ion storage batteries and super capacitors by laser technology, higher quality of plates.

10 cl, 5 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to laser plasma welding of metals and device to this end. Invention can be used for welding of such materials as steel and aluminium by combined laser plasma effects. Welding parts are preheated in the weld area by plasma flux. Laser beam is directed to but of welding parts. Produced weld is additionally heated by plasma flux. Plasma flux is shaped to circle while laser radiation is fed via geometrical centre of circular plasma flux to said butt. Device for laser plasma butt welding of metals comprises plasma flux and laser radiation sources. Plasma flux source comprises outer and inner ring electrodes to produce plasma flux located in one plane with their geometrical centres aligned at one point. Laser radiation source can feed laser radiation via said geometrical centre.

EFFECT: intensified welding, lower rate of weld cooling, higher strength of the weld.

2 cl, 1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates for surface processing to get glossy and dull sections. In compliance with this process, surface pre-coated with first copper ply and second ply including bottom nickel ply and top chromium ply is subjected to selective removal of chromium ply on sections to be frosted. Selective removal is performed by laser displaced above the surface. Note here that laser exposure and power are adjusted to get various texture. Then, ply of noncorrosive metal containing zirconium and chromium is evaporated from vapour phase on said surface.

EFFECT: production of glossy and frosted surface sections.

5 cl

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