Method of dip-transfer surfacing

FIELD: engines and pumps.

SUBSTANCE: electrode and part are connected to the DC welding source by reverse polarity circuit. Transferring the material of the vibrating electrode is carried out by the arc occurring while retracting the electrode from the part surface after their contact. In every moment of the electrode contact with the part surface, a positive current pulse of the capacitor discharge is supplied to the electrode, the parameters of which are selected from the conditions for providing the process of electric-spark alloying the part surface by the electrode material with the creation of the diffusion layer in the area of said contact. The capacitor discharge current pulse is supplied with the energy of 0.5-10.0 J at the capacitor charge voltage of 30-100 V.

EFFECT: possibility of reducing the welding current while processing thin-walled parts, with the simultaneous increased strength of the weld surface adhesion with the part metal.

2 cl, 1 dwg, 1 tbl

 



 

Same patents:

FIELD: metallurgy.

SUBSTANCE: device contains the housing with a loading window, a supply channel and a nozzle, a feeding screw with drive, and a bin. The bin is attached to the loading window of the housing and fitted with the regulator of the cross section of the loading window. The regulator is implemented as a tray fixed in the bin with a possibility of movement along the loading window. The supply channel is executed with a constant diameter along the whole length of the channel. The screw is installed in the supply channel with a gap 1-2.5 mm with reference to the channel wall. The screw is made with a variable pitch with reduction of pitch towards the furnace charge supply.

EFFECT: detail surface hardening.

4 cl, 2 dwg

FIELD: metallurgy.

SUBSTANCE: under method the size of vanadium carbide particles is reduced, and they are uniformly distributed over the volume of the austenite-martensite matrix of the hardened layer based on Fe-Cr-V-Mo-C system without pores, lack of fusion and cracks.

EFFECT: invention ensures significant reduction of the coating wear.

1 tbl, 2 dwg

FIELD: agriculture.

SUBSTANCE: invention can be used for application of wear-resistant coatings on working surface of parts of tillers, having a shape of oblique wedge using fusion welding. The wear-resistant filler material is applied to the said surface in the form of parallel strips with a thickness of the weld layer of 2-4 mm at a right angle to the direction of displacement of the working surface of the part at a distance from each other of not more than 15 times the layer thickness. The strips are applied to the upper and lower inclined faces in the area of compressing stress of the working surface of the part with a shift from each other by the same distance in the direction of movement of the parts. The width of the weld strips on the work surface of the parts is set not more the double thickness of the weld layer.

EFFECT: invention enables to reduce the wear rate of the working surface of the parts by deformation and reduction of the density of the surface active layer of the soil in the area of the greatest intensity of friction.

2 cl, 4 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy and can be used for reconditioning of worn-out working rolls. First damaged ply is removed mechanically to heat the roll to 150-270°C. Arc deposition of wear-proof coating is performed with powder wore feed to welding area in at least three plies not over 9 mm in depth. Directly after deposition said roll is heated to 250-300°C and held thereat for at least one hour followed by cooling to not over 60°C.To get built-up ply over 9 mm in depth, powder wire is pre-deposited on roll surface to produce extra sub ply of preset depth. For deposition of extra sub ply powder wire is used that contains the following elements, wt %: 0.25-0.45 C, 0.7-1.2 Cr, 0.5-1.2 Mn, 0.15-1.2 Si, Cu<0.3, Ni<0.4, Fe making the rest. For deposition of wear-proof ply powder wire is used that contains the following elements, wt %: 0.25-0.45 C, 2.0-2.7 Cr, 0.5-1.2 Mn, 0.15-1.2 Si, 7-11 W, 0.15-0.55 V, Fe and gas- and slag-forming components making the rest.

EFFECT: higher wear resistance, longer life.

2 cl

FIELD: process engineering.

SUBSTANCE: invention can be used for application of wearproof coatings on tiller working surfaces. Wearproof filler is built up on part working surface as strips with 2-4mm-deep ply at the angle to part working surface displacement path. Said strips are applied clockwise or counter clockwise in curvilinear path of loop-like cycloid shape. Distance between extreme points of built-up ply side surface at strip symmetry lengthwise axis is set equal to 1-3 sizes of built-up ply width. Angle between built-up strip symmetry lengthwise axis and working surface displacement path makes 0-90 degrees. It is possible to apply wearproof filler composed of blocks of two or three parallel strips. Adjacent strips can be shifted relative to each other along loop-like section mirror axis through half their length.

EFFECT: decreased rate of wear.

3 cl, 6 dwg

FIELD: machine building.

SUBSTANCE: wear-resistant adding material is welded up along the working surface of a part with streamline shape, the said material is presented as identical strip sections 2-4 mm thick which are parallel to each other, arranged in staggered order at the right angle to the direction of the part's working surface movement. The length of the strip sections is 5-7 times more than their width, and the distance between them amounts to not more than the width of the welded up strip, and the distance between the adjacent strips is equal to the strip width. The longitudinal symmetry axis of the central welded up strip is placed in the same plane as the symmetry axis of the working surface is, in the movement direction of the latter.

EFFECT: invention allows for the decrease of wear rate of base metal in the zone of most intense friction of the part's working surface with streamline shape by means of increasing the degree of deformation and hoeing of the near-surface active soil layer in the movement direction.

2 dwg

FIELD: process engineering.

SUBSTANCE: invention can be used for production of filler rods for surfacing of drill tools in contact with well walls, for example, blade drill bits. Solid alloy is ground to required grain size of hard alloy grit to be cleaned of dust and fine fragments. Brass wire is cut to lengths powder solder ingredients are mixed. Initial components are laid layer-by-layer. First thin layer of solder is filled in mould bottom, first half of hard alloy grit portion is laid and levelled. Hard alloy grit remainder is laid on solder second layer. Brass wire lengths are laid on solder third layer without allowances to fill in the fourth solder layer. Mood is placed, without mixing or displacing of components, into induction furnace and heated to fusion of brass wire lengths and solder. Mould withdrawn from furnace, produced filler rods are cooled down. Said mould is composed of graphite plate with recesses for several filler rods.

EFFECT: higher mechanical properties of the rods, higher reliability and longer life of welded parts.

9 cl, 3 dwg

FIELD: metallurgy.

SUBSTANCE: melting material for steel material acting as base metal contains the following, wt %: C from 0.2 to 1.5, Si from 0.5 to 2, Mn from 0.5 to 2, Cr from 20 to 40, Mo from 2 to 6, Ni from 0.5 to 6, V from 1 to 5 and W from 0.5 to 5, the rest is Fe and inevitable impurities.

EFFECT: weld metal is characterised by high resistance to corrosion and abrasion wear, as well as high impact hardness at room temperature.

13 cl, 11 dwg, 4 tbl, 7 ex

FIELD: process engineering.

SUBSTANCE: invention relates to hardening of parts operated under abrasive wear conditions. Dip-transfer surfacing of wearproof material with application of graphite electrode is executed. Facing material represents a cermet composite containing consolidated alloys of carbides, borides, nitrides and reinforcing ceramic superhard inclusions of boron carbide, corundum and carbocorundum. Simultaneously wit surfacing, surface being hardened is alloys with boron, nitrogen and carbon. After surfacing, the part is heated in furnace to 750…770°C and held for 1.5…2 minutes. Then, quenching and low tempering are performed at part heating to 150…160°C and holding for 8…10 minutes.

EFFECT: two- threefold increase in toughness, threefold increase in wear resistance.

1 tbl

FIELD: machine building.

SUBSTANCE: method of layer-by-layer wear-resistant building-up welding of steel bearing races of rotary supports of jib cranes in the medium of shielding gases includes the making of layers without preheating and after-welding heat treatment. The building-up welding is performed by stably austenitic welding materials in conditions excluding the quenching of the detail under the first layer. After building-up welding of the first layer and its curing the building-up welding of the second and consequent layers with chrome-manganese materials in conditions excluding the mixing and through penetration of the first layer, and also quenching of built-up detail. The first layer is made at a forward speed 2-5 m/h with stably austenitic welding materials of the type Sv-Kh15N25AM6 or welding rods EA-395/9, NIAT-5, ANZhR-1, ANZhR-2 and EA-48/N22. The second and consequent layers are made at a speed 18-25 m/h with austenitic chrome-manganese materials of the type Sv-Kh18N7G7 or welding rods TsNIIN-4.

EFFECT: excluding possibility of formation of hardening patterns in quenched steel, which result to cooling cracks under the building-up welding.

2 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention may be used in welding of straight, curved and ring butts. Welding torch, welding wire feed device and vibrator are arranged on strut slide. Strut is arranged on support and incorporates horizontal motion drive. Support is arranged on cam to turn about horizontal axis. Cam is mounted in journal to turn vertically. Journal is arranged on support to turn about vertical axis. Torch vibrator consists of plate secured to welding torch, axle with rocker fitted thereon, fixed and moving plates, and motor with cam fitted on output shaft. Lengthwise slot is made in every plate. Motor may displace along said slot and be locked in preset position. Cam is passed through moving fixed plate slot and extended into moving plate slot.

EFFECT: accurate adjustment of torch to butt, higher quality of welding.

2 cl, 6 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to welding technologies. Proposed method comprises subjecting welded joint to ultrasound impulse oscillations. Said ultrasound impulse oscillations are introduced directly into welding bath via welding electrode in welding at frequencies of 22.7 to 24.0 kHz.

EFFECT: higher efficiency.

1 dwg

FIELD: vibration-electric arc welding processes and equipment at feeding electrode wire, possibly in motor and ship building industry branches, at oil and gas production, tool making industry branch.

SUBSTANCE: method comprises steps of continuously feeding electrode wire and imparting to it in addition reciprocation motion of different amplitude. Reciprocation motion of electrode wire end is provided by means of crank-connecting rod mechanism having rod of apparatus for feeding electrode wire by alternating impulses of reciprocation motion. Said rod is mounted on free end of connecting rod; it has opening for clamping wire and it is normal relative to axis of duct for feeding wire. Welding process is realized at burning electric arc cyclically excited due to electrode wire and part short circuiting occurred by action of dynamic force when oscillation amplitude of electrode wire end is maximal. Drops of melt electrode wire are transferred by action of dynamic force between time moments of short circuiting when oscillation amplitude of electrode wire end is minimal. Oscillation amplitude of electrode wire end is determined according to crank radius, angular velocity of crank rotation and length of connecting rod with use of expression at and where S - length of duct for feeding wire; L - distance between rotation axis of crank and slide; b - motion value of slide relative to axis of duct for feeding electrode wire or wire bending value; R - crank radius; ω - angular velocity of crank rotation; t - time; m - length of connecting rod; p - length of rod; Loa - distance between rotation axis of crank and axis of duct for feeding wire.

EFFECT: improved quality of welding.

2 cl, 4 dwg

FIELD: vibration-electric arc welding processes and equipment at feeding electrode wire, possibly in motor and ship building industry branches, at oil and gas production, tool making industry branch.

SUBSTANCE: method comprises steps of continuously feeding electrode wire and imparting to it in addition reciprocation motion of different amplitude. Reciprocation motion of electrode wire end is provided by means of crank-connecting rod mechanism having rod of apparatus for feeding electrode wire by alternating impulses of reciprocation motion. Said rod is mounted on free end of connecting rod; it has opening for clamping wire and it is normal relative to axis of duct for feeding wire. Welding process is realized at burning electric arc cyclically excited due to electrode wire and part short circuiting occurred by action of dynamic force when oscillation amplitude of electrode wire end is maximal. Drops of melt electrode wire are transferred by action of dynamic force between time moments of short circuiting when oscillation amplitude of electrode wire end is minimal. Oscillation amplitude of electrode wire end is determined according to crank radius, angular velocity of crank rotation and length of connecting rod with use of expression at and where S - length of duct for feeding wire; L - distance between rotation axis of crank and slide; b - motion value of slide relative to axis of duct for feeding electrode wire or wire bending value; R - crank radius; ω - angular velocity of crank rotation; t - time; m - length of connecting rod; p - length of rod; Loa - distance between rotation axis of crank and axis of duct for feeding wire.

EFFECT: improved quality of welding.

2 cl, 4 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to welding technologies. Proposed method comprises subjecting welded joint to ultrasound impulse oscillations. Said ultrasound impulse oscillations are introduced directly into welding bath via welding electrode in welding at frequencies of 22.7 to 24.0 kHz.

EFFECT: higher efficiency.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention may be used in welding of straight, curved and ring butts. Welding torch, welding wire feed device and vibrator are arranged on strut slide. Strut is arranged on support and incorporates horizontal motion drive. Support is arranged on cam to turn about horizontal axis. Cam is mounted in journal to turn vertically. Journal is arranged on support to turn about vertical axis. Torch vibrator consists of plate secured to welding torch, axle with rocker fitted thereon, fixed and moving plates, and motor with cam fitted on output shaft. Lengthwise slot is made in every plate. Motor may displace along said slot and be locked in preset position. Cam is passed through moving fixed plate slot and extended into moving plate slot.

EFFECT: accurate adjustment of torch to butt, higher quality of welding.

2 cl, 6 dwg

FIELD: metallurgy.

SUBSTANCE: welded joint welding bath is filled with successive electrodes. Ultrasonic vibrations are fed to one of welding electrodes in a welding bath at 30-70% of volume of welding bath filling with molten metal by prior electrodes.

EFFECT: invention improves quality of welded joint macrostructure in case of automated submerged multiarc welding, and also removes its internal defects in form of slag inclusions, pores.

2 dwg, 1 ex

FIELD: engines and pumps.

SUBSTANCE: electrode and part are connected to the DC welding source by reverse polarity circuit. Transferring the material of the vibrating electrode is carried out by the arc occurring while retracting the electrode from the part surface after their contact. In every moment of the electrode contact with the part surface, a positive current pulse of the capacitor discharge is supplied to the electrode, the parameters of which are selected from the conditions for providing the process of electric-spark alloying the part surface by the electrode material with the creation of the diffusion layer in the area of said contact. The capacitor discharge current pulse is supplied with the energy of 0.5-10.0 J at the capacitor charge voltage of 30-100 V.

EFFECT: possibility of reducing the welding current while processing thin-walled parts, with the simultaneous increased strength of the weld surface adhesion with the part metal.

2 cl, 1 dwg, 1 tbl

FIELD: processes for surfacing with use of lying electrode, possibly restoration of worn surfaces of parts in different industry branches.

SUBSTANCE: method for surfacing bead of rollers of road building machines comprises steps of arranging roller in such a way that its axis is vertical; dividing surfaced zone of bead by technological sectors; forming electrodes of n mutually joined rods bent along arcs of sectors and arranging them on surfaced area of respective sector with gap; supplying flux and additive powder material to surfaced zone; connecting electrode and part with power source for exciting electric arc and performing surfacing; placing electrodes on sectors of bead simultaneously along the whole circle; electrically connecting front end of one electrode with bead; at surfacing narrow beads, forming electrodes of n mutually joined rods arranged one over another.

EFFECT: enlarged manufacturing possibilities of method for surfacing parts with annular worn surface, lowered cost, enhanced efficiency of process.

3 cl, 5 dwg, 1 ex

FIELD: processes for surfacing by means of lying electrode, possibly manufacture of crowns of teeth of digging machines working in condition of intensified wear.

SUBSTANCE: method comprises steps of placing electrodes with gap on part to be surfaced; using flux and additive powder material; exciting electric arc between electrode and surfaced surface; performing multi-layer surfacing alternatively on upper and lower sides of crown; using steel substrate whose width is equal to distance between lateral faces of crown and whose length is equal approximately to difference of length values of new and worn crowns along axis of lateral side; arranging steel substrate in direction of plane crossing axes of lateral faces of crown and welding it to crown along contour of wear; fixing crown with welded substrate in such a way that at first its upper side is arranged horizontally, then its lower side is arranged horizontally; placing electrodes across lengthwise axis of crown at first on substrate and then on surfaced zones until their complete restoration.

EFFECT: enhanced quality of restored surface, lowered cost and simplified technique of process.

3 cl, 5 dwg, 1 ex

FIELD: restoration of cast iron rolling rolls with journals damaged at operation.

SUBSTANCE: method comprises steps of mechanically removing damaged layer and performing electric arc surfacing of rotated roll in place of damaged layer removal while feeding steel austenite wire electrode with diameter 3 - 5 mm to welding zone. Surfacing is realized at density of electric current 30 - 40 A/sq. mm and at electrode feeding speed 80 - 110 m/h. After surfacing journal is subjected to spontaneous cooling.

EFFECT: possibility for completely restoring geometry size of operational properties of damaged roll at keeping the same values of its hardness and strength.

1 tbl, 1 ex

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