Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
  • B23K25/00—Slag welding, i.e. using a heated layer or mass of powder, slag, or the like in contact with the material to be joined
  • B23K25/005—Welding for purposes other than joining, e.g. built-up welding

Definitions

• the present invention is a cylindrical or cylindrical member having a very cylindrical surface of a roll or a sled, and is an electro-slurry for performing a large-diameter or ultra-thin wall. It relates to the overlay welding method. The present invention also relates to an electroslag overlay welding apparatus for a member having a cylindrical surface.
• the electroslag welding method to which the electroslag surfacing method belongs, is based on the electroslag remelting method, which is known as a method for obtaining high-quality metals.
• the principle of dissolution is the same.
• electro-ladder welding the molten metal located below the molten slag layer is cut off from the atmosphere and immersed in the molten slag layer.
• a large current is supplied to the molten slag layer to melt the consumable electrode and the base metal surface by the heat generated by the slag, and to reduce the amount of electrode consumption.
• the lumps are gradually formed from bottom to top in the vertical direction, and then welded onto the base material.
• Electro-slag welding is used for welding thick plates or overlaying thick-walled members.
• Japanese Patent Publication No. 44-9905 proposes a mouth overlay method in which the mold and the base material are simultaneously rotated and only the base material is rotated down.
• the thickness is 50 to 100 mm! ) This is known from the above
• a copper alloy 2 was
• the build-up welding proceeds while the consumable electrode 4 whose component has been adjusted in advance is always supplied into the slag bath 3.
• the base material 1 has a higher melting point than the consumable electrode 4 because of its low alloy content, so the molten metal 7 of the base material becomes the metal pool 6 for overlaying. Even if it falls, it immediately solidifies, or if it hardly coagulates, the viscosity decreases and it cannot diffuse enough to the metal pool 6. If sufficient dispersion does not occur, it will solidify in the shape shown in Fig. 8 and become a non-uniform structure 9-1.
• the above-mentioned non-uniform structure 9-1 may be formed in the layer 9-2 as the welding progresses, and may extend to the build-up surface. is there .
• the purpose is to solve the points.
• the present invention uses a different material overlay method to lead high-quality composite rolls.
• Another object of the present invention is to process large-diameter members and produce high quality products.
• a part with a cylindrical surface where thick build-up metal can be welded
• the present invention is intended to supply cooling water to the rotating mode.
• Cooling water supply / drainage device that is not affected by welding heat
• the poles can withstand such a large current supply.
• a non-consumable electrode such as carbon or carbon
• the lithium oxides in the slag and the carbon dioxide and Si0 2 , MnO Reacts to generate CO gas forms a foam, covers the slag surface, degrades weldability, and oxidizes the electrode with air on the top surface of the slag.
• the tip of the electrode wears out, the shape of the electrode changes, the gap between the electrode and the base material fluctuates, which affects the penetration depth of the base material and causes the melting. This makes it difficult to control the penetration depth.
• the melting point of the cladding metal is low, so the high melting point used in low C SiO for flux. , MnO, etc., to lower the melting point of the flux.
• the inventor used a hoop-shaped coil as an electrode.
• the present inventor has proposed a composite coil electrode.
• the present invention uses a base material for the following reasons]? It is rotating.
• the reason is that a large current can be supplied to one electrode, and the number of electrodes can be extremely small (about 10 electrodes. Degrees or less).
• the base material is rotated with the same electrode, sufficient current can be supplied to the base material side and the mold steel slag bath by the base material rotation. This is a force that ensures the completeness of the melting and welding of the material and the good mirror surface of the build-up metal on the mold side.
• One of the purposes of rotating the base material here is to generate a uniform slag temperature in the circumferential direction even with a small number of electrodes. Due to the rotation of the slag bath in the circumferential direction, the slag temperature can be made uniform. In other words, by increasing the cross-section of the electrode, the slag bath temperature is made uniform in the radial direction of the slag bath and in the circumferential direction by the rotation of the base material.
• the required electrode length is almost equal to the welding length. In this case, the height of the entire equipment is low], and the operation is easier than in the case where molten metal is not added.
• F _ C -'FI of neutral current of this unbalanced part
• the value is at most 100 A.
• the use of a polyphase AC power supply also means that when overlaying with equipment that uses large currents, leakage of magnets prevents the inside drop due to magnetic leakage. There are advantages to stable operation such as prevention of reduction of power factor and prevention of equipment heating.
• a build-up space which is provided near the base material and which can move upward as the build-up operation progresses;
• a molten metal addition azotushi and a metal plate that is installed above the build-up space and that can move upward as the build-up operation progresses.
• Fig. 1 is a drawing illustrating the electroslag overlay method.
• FIG. 3 is a plan view of the apparatus of FIG.
• FIG. 4 is a diagram showing the connection adopted in the present invention.
• Fig. 5 shows a power supply system employed in the present invention.
• Fig. 6 shows the relationship between penetration ratio and metal pool ratio.
• Figure 8 is a drawing showing the relationship between the molten metal ratio and the metallographic 'one' ratio.
• FIG. 12 shows an electro-laser according to one embodiment of the present invention.
• FIG. 2 is a partial cross-sectional front view of the cladding apparatus.
• Fig. 13 is a cross-sectional view along the line A-A in Fig. 12.
• Figure 15 is a partially enlarged view.
• the above distance requirement is for a base material of, for example, 700 ⁇ $ 5.
• a single electrode will supply a current of 2000 to 500 OA.
• the target large current can be supplied with at most about 10 electrodes, which is an advantage of easy build-up. .
• multiple consumable electrodes 12 are used because the multi-phase AC power supply can be used and the heat source is Dispersion ⁇ : ⁇
• the welding current which is the basic operating factor (welding conditions) of electroslag welding, is considered.
• the range is larger than AZan in degrees.
• the former method 3 ⁇ 4 is adopted, and the neutral point of the power source “0” (No. It is necessary and necessary to connect Fig. 4) to the roll base material 10 (Figs. 2 and 3).
• the necessity for a polyphase power supply is explained below in comparison with the case of a single-phase power supply.
• each electrode When performing multi-electrode welding with one single-phase power supply, each electrode is connected in parallel. If the dissolution rate differs between the electrodes, one electrode will be deeply immersed in the slag bath, but the voltage during the slag of the electrode will decrease, and the other electrode will have a large current Flow, causing the voltage to be the same for each electrode. Yes. Also, the difference in current and voltage is caused by electrode immersion.
• the penetration depth of the base metal depends on the amount of the molten metal to be added. Since the amount is slightly affected, it is desirable to set the amount to be added to the target penetration depth, and then to control the penetration depth by current and voltage.
• the business is also large-scale D.
• the depth is 200-500 orchid and the bottom has a hole diameter of 3-6 ram0
• the nozzle If the nozzle is used and the temperature of the hot water is controlled, it can be added at a substantially constant speed of, for example, 15 per minute through the nozzle hole of five thighs. The level of the tubing drops during the overlay operation
• a slip ring is provided to connect the neutral point of the multi-phase welding power source to the base metal being used. The connection of the neutral point of the welding power source to the base metal is described above.
• the slag bath must always be located at the top of the mold. For this reason, it is necessary to either increase the mode as the welding progresses or lower the base material. In this case, the position of the tundish is always kept at a constant distance from the slag bath surface to prevent a change in the molten metal charging position. Therefore, the tandem is synchronized with the mold so that it is always at the same distance as the mold in order to keep the distance from the mold constant, and the movement is fixed or fixed. Need to be done.
• four columns 34 supporting the fixed floor 31 support the bridge 35 and are installed on the fixed floor 31.
• the base material 10 is held vertically.
• An up and down moving bed 33 for raising and lowering the driving means described below is provided with an opening equipped with a mirror type guided by a column 34.
• the driving means is a motor 148 installed on the gantry].
• the motor 17 and the hood 8 surrounding the roll base material 10 on the inner surface are constituted. Raise and lower all at once.
• the consumable electrode 12 is fixed to a single electrode support arm 43 (FIG. 11), which is supported by four wires 25]).
• Wire 3 5
• the par-shaped consumable electrode 12 is raised and lowered.
• the multi-phase AC welding power supply 11 (hereinafter referred to as power supply 11) is placed on a fixed floor 31 and connected in a star.
• Each of the three phases u, V, and w of the star connection mediate the ring busper 42, and the flexure bridge 44! ) Power is being supplied to each electrode.
• the pedestal 35 is disconnected from the power supply line, and no conduction occurs between the electrode support arm 43 and the consumable electrode 12.
• the neutral point "0" of the power supply 11 is determined by the cable 47]?
• the stand 18 is installed at the top right of the figure 10 so that the molten finance 13 flows from the nozzle into the center of the molten slag 14. If the molten metal 13 in the tandem 18 decreases, the position of the nozzle flow varies slightly, and the tandem 18 is moved to the roll mother. Slightly displaces radially and horizontally with respect to the axis of material 10 0
• the synchronous rotation mechanism between the roll base material 10 and the mold 17, hereinafter referred to as the synchronous rotation mechanism, is a roll.
• the base material 10, the mold 17, and a separate drive motor 21 1 And 26 are installed, and this is based on sersin 22] 9
• the rotation speeds are matched and synchronized.
• the electrode supporting arm 43 has a ring shape having a substantially arc-shaped opening in approximately one fourth of the figure. Avoids interference with the dish 18. In addition, when molten metal 13 is added to the tandem 18, it can be easily introduced using a ladle.
• the apparatus comprises: a fixed floor;
• a turn table installed on a fixed floor and supporting the base material vertically
• OMFI It has a star connection output and has a constant voltage characteristic.
• the base material is electrically connected to the neutral point of the star connection.
• Electrode lifting equipment that can simultaneously move up and down using consumable electrodes
• Tungsten for adding molten metal that can move upward
• a vertically rotating device wherein the floor is movable vertically.
• the columnar base material 50 has an upper clamp
• the turntable 61 is rotatably installed on the fixed floor 70, and rotates the columnar base material 50.
• the mount 60 to which the upper clamp device 66 is connected is supported by four columns 59.
• the driving force of the driving motor 54-1 is transmitted through the worm reducer 57-1 and the driving force transmission gear 57-2 to the rotor joint 6. It is supplied to 2 and transmitted to turntable 61.
• a rotating speed detector 54-2 and a synchronous load 65 per rotation of the motor will be provided for the moving motor 54-1.
• a mold 52 surrounding the columnar base material 50 on the inner surface and a built-up metal heat insulator 53 are integrally provided for convenience including the continuous connection 20, and the working lift floor,
• the vertical moving floor 6 extending from the mounting floor and the drive motor 55-1 suspends the mold 52 and the heater 53.
• the mold 52 and the heater 53 are provided concentrically with the cylindrical base material 50.
• the vertical moving bed 64 is in accordance with the chain 68.) The vertical moving bed 64 can be moved up and down by following the balance weight 69 via the split 67.
• the drive power of the drive motor 1 5-1 is the worm reducer
• the drive motor 55-1 uses the rotation speed detector 55-2
• V. IFO The motors are monitored, electrically connected to the drive motors 54-1, and their rotations are synchronously controlled by the synchronizer 65.
• Fig. 12 One of the features shown in Fig. 12 is that power is externally applied to the roll base material and the mold, respectively, and that they are rotated synchronously. Further, it has a feature that facilitates the supply of cooling water as described below. ⁇
• the cooling water to be supplied to the mold 52 is not divided into molds.
• a rotor joint 62 and a fixed joint 63 are provided below a columnar base material 50 maintained in a vertical position.
• These joints including water conduits (not shown), are far from the welding heat source and therefore do not have significant thermal effects, and are combatable. It can be a cut-off facility.
• the synchronous rotation of the mold 52 and the columnar base material 50 may be performed by one motor, but it is preferable.
• drive motors (55.1-1, 54.1-1) are separately installed and a single motor is used to synchronize them. When using it, it is necessary to rotate the mold and the base metal at the same time by mechanically displacing them and synchronize them, but it is long. It is difficult to mechanically link the base metal because the mold rises as the welding progresses.
• FIGS. 12 and 13 show, for simplicity, the stand, the multi-phase AC power supply and the slip, but the essential parts of the hardfacing equipment are shown. J), its operation and its relationship with other components are described with reference to FIGS. 10 and 11]. It will be clear.
• the equipment described with reference to FIGS. 14 and 15 consists of a fixed floor
• a rotary joint mounted on a fixed floor and having holes for supplying and discharging cooling water
• the rotating base metal is connected to the neutral point of the star connection.
• a mold K which defines a build-up space, is located near the base material, and can be moved upward as the build-up operation proceeds.
• the columnar base material 50 is vertically rotatably held between an upper clamp device 66 and a lower clamp device 96.
• Each clamp is firmly framed by a frame 60, four columns 59, and a fixed floor 70.
• a mold 52 surrounding the cylindrical base material 50 with an annular inner surface is water-cooled, and a water supply joint 83 is formed. Drainage-has a joint 84]), which communicates with these 83 and 84, and the joint 83 and 84 together with the bucket 86 It is placed on the support stand 87.
• the support base 87 includes a projection 87-1 attached to the periphery 3 thereof, and is rotatably mounted on a horizontal roller 88 through this horizontal part.
• the support base 87 is guided by a vertical roller 89 during its rotation, and this vertical roller 89 restricts the horizontal displacement of the vertical part of the projection 87-1.
• the position of the vertical roller 89 is adjusted according to the screw 121].
• the driving mechanisms, collectively indicated by 100, of the synchronous rotating mechanism are a drive motor 792, a worm reducer 781-2, a rotation transmission gear 85, and a cell machine. 80 and are operatively connected to each other to rotate the mold 52.
• An operator floor 69 may be provided adjacent to the floor 90.
• the floor 90 receives the driving force of the motor 56 (FIG. 14) and, via a sprocket 67, a chain 6 having a weight 69. 8] It is possible to move up and down freely.
• the lower clamp device 96 (Fig. 14) is located concentrically with the rotation axis of the columnar base material 50, and intervenes through the rotor-choice 63 provided at the erect center. And is provided on the fixed floor 70. In order to rotate the reel in synchronization with the rotation of the base metal, the reel for hose 105 is replaced by c :: n in Fig. 15. It is preferable to provide them as shown. Lower clamp
• Hose 105 is (a) reel
• Mouth-Tally-Joint 6 3 is provided from the inner rotating body 63-1 and the outer case 63-2 3 ⁇ 4
• a water supply port 108 and a drain port 109 are provided. (Not shown)]?
• ⁇ -Tally junction 6 3 Prevents water leakage during rotation.
• the inner rotating body '63 -1 is fixed to the lower clamp 96 and is rotatable by the drive mechanism 100.
• the outer case 63-1 is fixed to the fixed floor 70.
• Lower crank: 7 ° device 96 is supported on support mat 1 1 1 via thrust pairing 1 1 2, with radial pair ring 13 on outer casing 9, which smoothens the rotational movement of the cylindrical base material 50.
• the drive mechanism of the synchronous rotation mechanism is composed of a rotation transmission gear 57-2 and a worm.
• cladding devices shown in Fig. 14 and Fig. 15 are operated as follows.
• Electroslag overlay welding was performed with the following base metal and turning conditions.
• the composition is 1.6% C, 2 ⁇ Cr, 3 ⁇ Ni, 1% Mo remaining! ) Fe.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Arc Welding In General (AREA)
• Control Of Resistance Heating (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=26449579

Family Applications (1)

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Cited By (8)

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Citations (1)

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• 1980
  • 1980-12-23 CA CA000367397A patent/CA1164056A/en not_active Expired
  • 1980-12-23 GB GB8041208A patent/GB2067109B/en not_active Expired
  • 1980-12-23 SE SE8009093A patent/SE443311B/sv unknown
  • 1980-12-24 IT IT8026977A patent/IT1209379B/it active
  • 1980-12-29 US US06/220,725 patent/US4373128A/en not_active Expired - Fee Related
  • 1980-12-29 BR BR8008533A patent/BR8008533A/pt unknown
  • 1980-12-29 DE DE3049283A patent/DE3049283C2/de not_active Expired
  • 1980-12-29 FR FR8027658A patent/FR2472435A1/fr active Granted
  • 1980-12-30 AU AU65900/80A patent/AU535772B2/en not_active Ceased
• 1981
  • 1981-01-05 WO PCT/JP1981/000001 patent/WO1981001812A1/ja not_active Ceased

Patent Citations (1)

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