CN113210828A - Thick-wall pipe lateral induction straight seam welding device and method thereof - Google Patents
Thick-wall pipe lateral induction straight seam welding device and method thereof Download PDFInfo
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- CN113210828A CN113210828A CN202110601335.9A CN202110601335A CN113210828A CN 113210828 A CN113210828 A CN 113210828A CN 202110601335 A CN202110601335 A CN 202110601335A CN 113210828 A CN113210828 A CN 113210828A
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- 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
- B23K13/00—Welding by high-frequency current heating
- B23K13/01—Welding by high-frequency current heating by induction heating
- B23K13/02—Seam welding
- B23K13/025—Seam welding for tubes
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- 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
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
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Abstract
The invention discloses a thick-wall pipe lateral induction straight seam welding device which comprises a compression roller, a numerical control operating platform, a support frame, an end cover, a hydraulic cylinder, a local induction heating device, an infrared thermometer, a disc-shaped induction coil, a rack, a hydraulic jacking device, a hydraulic telescopic arm, a support shaft, an edge heating module and a coupling block, wherein the support frame is arranged on the upper part of the rack; the invention provides a lateral induction straight seam welding method for a thick-wall pipe, which comprises the steps of preheating the upper side and the lower side of a welding gap of the thick-wall pipe through an induction coil connected with a magnetizer and controlling the axial expansion of a hydraulic cylinder to control the position of a local induction coil, and supplementing heat to the low-temperature part of the side wall of a welding seam; the invention effectively controls the heating range and efficiency by heating through transverse magnetic flux, supplements heat to the low-temperature part by the coil provided with the magnetizer, solves the problem of uneven temperature of the welding surface caused by boundary effect, and can greatly reduce the welding defects of cold welding, slotting, edge wave and the like.
Description
Technical Field
The invention belongs to the field of induction welded pipes, and particularly relates to a lateral induction straight seam welding device and method for a thick-wall pipe.
Background
With the continuous consumption of world energy, deep sea oil and gas are developed gradually in all countries in the world, and with the gradual increase of the seabed depth of oil and gas exploitation and transportation, the water pressure required to be born by a seabed energy transmission pipeline is also enhanced more and more, the wall thickness of the deep sea oil and gas pipeline is one of important technical indexes for bearing the deep sea water pressure, and the production and the manufacture of thick-wall pipes become technical points which need to be overcome urgently; at present, the production process of straight welding seams for manufacturing the pipe used for deep sea oil and gas transportation rarely uses, and the technology of applying induction heating to welding is gradually mature along with the high-speed development of induction heating in the last century, wherein the high-frequency induction welded pipe has the advantages of high welding speed, small welding heat affected zone, weldable thin-walled pipe and the like, and is widely adopted by the manufacturing industry; however, because of the proximity effect and the boundary effect during electromagnetic induction heating, when a high-frequency welded pipe is welded with a thick-wall pipe, the eddy current on the side wall of the welding seam always concentrates towards the inner side and the outer side of the pipe blank, so that the temperature of the inner side and the outer side of the welding seam is high, the temperature of the middle layer of the welding seam is low, and welding defects such as cold welding, slotting, edge wave and the like are generated; for high-frequency welded pipes, the main heating mode adopted at present is that an inductor is matched with an impedor to increase and concentrate a weld magnetic field so as to perform induction heating on a straight weld of the welded pipe; however, the phenomenon of uneven temperature distribution of the side wall of the weld joint is still not solved, so that the straight seam welding of the thick-wall pipe cannot be carried out, and the induction heating cannot be widely applied in the straight seam welding of the thick-wall pipe all the time.
Disclosure of Invention
Aiming at the problems, the invention provides a welding device capable of realizing uniform induction heating of a thick-wall tube blank in the thickness direction, wherein transverse magnetic flux induction heating is carried out on the inner side wall of a welding seam of the tube blank through a magnetic field generated by a disc-shaped induction coil, and meanwhile, the temperature distribution condition of the side wall of the welding seam is measured in real time by an infrared thermometer, so that a local induction coil behind the infrared thermometer is controlled to supplement heat for a low-temperature part, and the aim of uniformly heating the side wall of the welding seam is fulfilled; the whole device can adjust the space position of the support frame where the induction coil is positioned so as to adapt to the welding of pipes with different pipe diameters, and has better universality.
In order to achieve the purpose, the technical scheme adopted by the invention is to provide a lateral induction straight seam welding device for a thick-wall pipe, which comprises a press roller, a numerical control operating platform, a support frame, an end cover, a hydraulic cylinder, a first pair of local induction heating devices, a first pair of infrared thermometers, a second pair of local induction heating devices, a second pair of infrared thermometers, a first disc-shaped induction coil, a second disc-shaped induction coil, a frame, a hydraulic jacking device, a hydraulic telescopic arm, a first support shaft, a second support shaft, an edge heating module and a coupling block; the pressing roller presses and pushes the pipe blank to be welded for transmission; the support frame is arranged in the center of a welding seam of the tube blank to be welded and has the same distance with two side surfaces of the welding seam; a first disc-shaped induction coil, a second disc-shaped induction coil, an edge heating module, a first pair of local induction heating devices, a first pair of infrared thermometers, a second pair of local induction heating devices, a second pair of infrared thermometers and a coupling module are fixedly arranged on the supporting frame; a numerical control operating platform is fixedly arranged at the front end part of the rack, and the tail part of the rack is connected with a hydraulic jacking device; the left side of the rack is fixedly provided with two hydraulic cylinders, and the front end parts of the two hydraulic cylinders are connected with the left end of the hydraulic telescopic arm; the right ends of the two hydraulic telescopic arms are connected with the coupling block, and the coupling block is fixedly connected with the support frame through a first support shaft and a second support shaft; the first support shaft and the second support shaft can translate in the transverse sliding groove at the front end of the rack, end covers are arranged on two sides of the first support shaft and the second support shaft, and the end covers are arranged on the outer side of the transverse sliding groove at the front end of the rack;
two edge heating modules are fixedly arranged in a sliding groove between the upper bracket and the lower bracket on the left side of the supporting frame; a first disc-shaped induction coil is arranged on the right side of the edge heating module, and the bottom of the first disc-shaped induction coil is fixedly connected with a lower support of the support frame; a first pair of infrared thermometers are arranged on an upper support of the support frame on the right upper side of the first disc-shaped induction coil, and a first local induction heating device is arranged on the right side of the first pair of infrared thermometers; a second disc-shaped induction coil is arranged on the right side of the first local induction heating device and is fixedly connected with the lower support of the support frame; and a second pair of infrared thermometers are arranged on the upper support of the support frame at the upper right side of the second disc-shaped induction coil, and a second local induction heating device is arranged at the right side of the second pair of infrared thermometers.
Furthermore, a round hole at the front end of the coupling block is concentric with a round hole of a rectangular open slot at the upper end of the support frame, and the coupling block and the first support shaft form rotary fit; the first support shaft and the transverse sliding chute at the front end part of the rack form sliding fit, so that the first support shaft can translate in the sliding chute under the pushing of the hydraulic cylinder; the round hole in the support frame upside forms clearance fit with first supporting shaft, and the round hole lower extreme is equipped with the rectangle through-hole, forms sliding fit with second supporting shaft.
Further, the edge heating module comprises an embedded sliding block, a long-axis bolt, a nut, a rectangular induction coil and a rectangular magnetizer; the embedded sliding block can slide in a sliding groove between the upper bracket and the lower bracket on the left side of the supporting frame; the long shaft bolt and the nut are used for fixing the embedded sliding block on the supporting frame; the right end face of the embedded sliding block is provided with the rectangular induction coil, and the rectangular induction coil is matched with the rectangular magnetizer.
Furthermore, the local induction heating device comprises a servo motor, a screw rod, a push-pull type sliding block, an L-shaped induction coil and a magnetizer; the servo motor is fixedly arranged at the upper end of the support frame; the screw rod is arranged on the lower side of the servo motor; the screw rod is slidably mounted with the push-pull type; the lower end of the push-pull sliding block is provided with the L-shaped induction coil; the L-shaped induction coil is provided with the magnetizer.
Preferably, the two infrared thermometers on the left side of the support frame measure the temperature of the side wall on the right side of the tube blank, and the two infrared thermometers on the right side of the support frame measure the temperature of the side wall on the left side of the tube blank; the support frame is arranged in the center of a welding seam at the upper end of the tube blank, and the distance between the support frame and the left side wall and the distance between the support frame and the right side wall of the welding seam of the tube blank are the same.
Based on the thick-wall pipe lateral induction straight seam welding device, a welding method of thick-wall pipe lateral induction straight seam welding comprises the following steps:
step S1: setting heating temperature difference delta T and welding temperature T of side wall of welding seam0Length S of tube blank0First disc-shaped induction coil power P1Second, secondDisc-shaped induction coil power P2The linear speed V of the rotation of the compression roller;
step S2: the numerical control operating platform controls the hydraulic jacking device to adjust the height position of the frame according to the size of the thick-walled pipe; controlling hydraulic telescopic arms at the front ends of the two hydraulic cylinders to respectively extend L1 and L2 according to the size of an opening angle of a welding seam and the deformation degree of a pipe blank at the welding seam, so as to realize the adjustment of the axial displacement and the horizontal inclination angle of the support frame on the pipe blank, ensure that a first disc-shaped induction coil and a second disc-shaped induction coil on the support frame are arranged in the center of the side wall of the pipe blank, and enable an upper support and a lower support of the support frame to be parallel to the side line of the side wall of the pipe blank at the welding seam;
step S3: electrifying the rectangular induction coil, and preheating the upper side and the lower side of the side wall of the welding seam through the magnetizer; the temperature and the resistivity of the upper side and the lower side of the side wall of the welding seam are improved, and the eddy current density of the edge of the welding seam during later induction heating is reduced;
step S4: a first disc-shaped induction coil is connected to carry out first comprehensive heating on the inner side of the welding seam; the numerical control console starts to record heating time t, and the temperature distribution of the side wall of the welding seam after being heated by the first disc-shaped coil are measured by a first pair of infrared thermometers on the supporting frame; calculating the temperature difference of the side wall of the welding seam by a numerical control operation table, and the temperature difference Tmax-Tmin|＝ΔT1If the temperature difference of the side wall is delta T1If the temperature is more than or equal to delta T, controlling the first local induction heating device to heat the low-temperature part on the side surface of the welding seam of the tube blank; if surface temperature difference is Delta T1<Δ T, the first local induction heating device is in standby;
step S5: a second disc-shaped induction coil is switched on to carry out second comprehensive heating on the welding seam, and a second pair of infrared thermometers are used for measuring the temperature of the part to be welded; the numerical control operation table calculates the temperature difference of the side wall of the welding seam and the temperature difference Tmax-T0|＝ΔT2If the surface temperature difference is Δ T2>0 and Δ T2The power P of the second disc-shaped induction coil is reduced by the numerical control operation platform when the temperature is more than or equal to delta T2(ii) a If surface temperature difference is Delta T2<0 and | Δ T2The power P of the second disc-shaped induction coil is lifted by the numerical control operating platform when the | ≧ delta T2Up to | Δ T2Delta T is less than or equal to | T; when | Δ T2When | < delta T, the numerical control operation table meterCalculating Tmin-T0＝ΔT3If | Δ T3If the absolute value is more than or equal to delta T, controlling the second local induction heating transposition to heat the low-temperature part on the side face of the welding seam of the tube blank; if surface temperature difference is | Delta T3|<Delta T, the second local induction heating device is in standby;
step S6: calculating V multiplied by t as S; if S0>S, the device continues welding; if S0And if the temperature is less than or equal to S, stopping the device.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
(1) at present, the temperature of a welding point is mainly controlled in a closed loop mode in the pipe welding technology, but the temperature difference in the wall thickness direction of a control pipe is rarely researched; according to the invention, before the side wall of the welding seam is formally heated, the rectangular induction coil is used for preheating the edge of the welding seam, so that the temperature of the edge of the side wall of the welding seam is raised in advance, the electrical resistivity of the edge is improved, the magnetic conductivity of the welding seam is reduced, eddy current generated and gathered at the edge of the welding seam is reduced when the welding seam is formally heated at the later stage, and the influence of a boundary effect is reduced.
(2) Compared with the traditional induction heating mode of an inductor and an impedor, the novel transverse magnetic flux induction heating mode is adopted, magnetic lines of force generated by the disc-shaped induction coil are more concentrated in a region to be welded, accurate heating is carried out on the side wall of a strip weld, the heating efficiency is high, and the heated region is more accurate.
(3) The invention adopts the L-shaped induction coil with the magnetizer to carry out heat compensation on the low-temperature part, so that the side wall with the welding seam is heated uniformly, and the condition of nonuniform heating caused by induction heating proximity effect and boundary effect is solved.
(4) The support frame where the induction coil is located is connected and controlled by the two hydraulic cylinders, the displacement of the support frame in the axial direction of the tube blank is controlled by the expansion of the hydraulic telescopic arms, and meanwhile, the support frame rotates by a certain angle in a vertical plane by means of different elongation of the two hydraulic telescopic arms, so that the deformation angles of the support frame and the welding seam of the tube blank are the same, and the induction coil is ensured to be located in the center of the side of the tube to be welded.
(5) The hydraulic jacking device can adjust the height of the frame according to the pipe diameter of the pipe blank to be welded so as to adapt to different working conditions, and the welding device is wider in universality.
Drawings
FIG. 1 is a schematic structural diagram of a lateral induction straight seam welding device for thick-wall pipes according to the present invention;
FIG. 2 is an isometric view of the thick-walled pipe side induction butt welding apparatus of the present invention;
FIG. 3 is a right isometric view of the thick-walled pipe side induction butt welding apparatus of the present invention;
FIG. 4 is a schematic diagram of an edge heating module of the lateral induction straight seam welding device for thick-wall pipes according to the present invention;
FIG. 5 is a half sectional view of the thick walled pipe side induction butt welding apparatus of the present invention;
FIG. 6 is a cloud chart of the weld side wall temperature measured by the infrared thermometer of the lateral induction straight seam welding device for thick-walled pipes according to the present invention;
FIG. 7 is a cloud of the weld side wall temperature measured by the infrared thermometer of the lateral induction straight seam welding device for thick-walled pipes according to the present invention;
FIG. 8 is a process flow diagram of the welding method of the invention for lateral induction straight seam welding of thick-walled pipes.
The main reference numbers:
1-a compression roller; 2-a numerical control operation table; 3-tube blank; 4-a support frame; 5-end cover; 6-hydraulic cylinder; 7-a screw; 8-a second localized induction heating device; 801-servo motor; 802-lead screw; 803-push-pull slider; 804-an L-shaped induction coil; 805-a magnetizer; 9-a second pair of infrared thermometers; 10-a second disc-shaped induction coil; 11-a first disc-shaped induction coil; 12-a hydraulic jacking device; 13-a frame; 14-hydraulic telescopic arm; 15-a first support shaft; 16-an edge heating module; 1601-an embedded slider; 1602-long axis bolt; 1603-nut; 1604-a rectangular induction coil; 1605-rectangular magnetizer; 17-a bolt; 18-a coupling block; 19-a first pair of infrared thermometers; 20-a first local induction heating means; 21-second support shaft.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains. For example, front, rear, left and right are used for the present invention only for exemplary purposes and are words of convenience for description.
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
As shown in figures 1-7, in the induction welding device of the thick-wall straight welded pipe, a press roll 1 presses and pushes a pipe blank 3 for transmission, a support frame 4 is positioned in the center of the welding seam of the pipe blank 3 and has the same distance with two side surfaces of the welding seam, an end cover 5 is arranged on the surface of the upper end part of a frame 13 through a screw 7, a hydraulic cylinder 6 is arranged on the left end surface of the frame 13, and a numerical control operating platform 2 is arranged on the front end surface of the frame 13.
Two edge heating modules 16 are arranged in the longitudinal sliding groove at the left end of the supporting frame 4 and are uniformly distributed at the upper end and the lower end of the side wall of the welding seam of the tube blank 3 as shown in a local diagram I in figure 1 and figure 2; a first disc-shaped induction coil 11 is arranged on the right side of the edge heating module 16, and a lower end interface of the first disc-shaped induction coil 11 is connected with a lower support of the support frame 4; a first pair of infrared thermometers 19 is arranged on the right upper side of the first disc-shaped induction coil 11, and the first pair of infrared thermometers 19 are arranged at the front end and the rear end of the upper support of the support frame 4; a first local induction heating device 20 is arranged on the left side of the first pair of infrared thermometers 19, and the first local induction heating device 20 is arranged in a first sliding groove of the upper bracket of the support frame 4; a second disc-shaped induction coil 10 is arranged at the left side of the first local induction heating device 20, and the lower end interface of the second disc-shaped induction coil 10 is arranged at the upper side of the lower bracket of the supporting bracket 4; the second pair of infrared thermometers 9 is positioned above the second disc-shaped induction coil 10 and is arranged at the front end and the rear end of the left side of the second sliding chute of the upper bracket of the supporting bracket 4; a second local induction heating device 8 is arranged on the left side of the second pair of infrared thermometers 9, and a first local induction heating device 20 is arranged in a second sliding groove of the upper support of the support frame 4.
A crankshaft of the hydraulic cylinder 6 is connected with a hydraulic telescopic arm 14, and a coupling block 18 is arranged at the front end of the hydraulic telescopic arm 14; a round hole at the front end of the coupling block 18 is concentric with a round hole of a rectangular open slot at the upper end of the support frame 4, and the coupling block 18 and the first support shaft 15 form rotatable fit; the first support shaft 15 and the transverse sliding groove at the front end of the frame 13 form movable fit, so that the first support shaft 15 can translate in the sliding groove under the pushing of the hydraulic cylinder 6.
The local induction heating device 8 comprises a servo motor 801, a lead screw 802, a push-pull type slide block 803, an L-shaped induction coil 804 and a magnetizer 805; the servo motor 801 is connected with the top of an upper support sliding groove of the support frame 4 through a bolt 17, a lead screw 802 is arranged at the lower end of the servo motor 801 and can drive the lead screw 802 to rotate, the lead screw 802 and the push-pull type sliding block 803 form threaded fit, so that the lead screw 802 can drive the push-pull type sliding block 803 to move up and down through rotation, an L-shaped induction coil 804 is arranged at the lower end of the push-pull type sliding block 803, and a magnetizer 805 is arranged at the end part of the L-shaped induction coil.
The two infrared thermometers on the left side of the support frame 4 measure the temperature of the side wall on the right side of the tube blank 3, and the two infrared thermometers on the right side of the support frame 4 measure the temperature of the side wall on the left side of the tube blank 3; the support frame 4 is located 3 upper end welding seams of pipe central authorities, and the support frame 4 is the same apart from 3 welding seams of pipe left and right sides wall distances of pipe.
The edge heating module 16 comprises an embedded slider 1601, a long-axis bolt 1602, a nut 1603, a rectangular induction coil 1604 and a rectangular magnetizer 1605; as shown in fig. 2, a local view is shown in a number i, the embedded slider 1601 is disposed in a longitudinal sliding slot of the support frame 4, and the embedded slider 1601 is fastened with a nut 1603 through a long-axis bolt 1602 and can be fixed by friction with the longitudinal sliding slot of the support frame 4, a rectangular induction coil 1604 is disposed at the front end of the embedded slider 1601, and the rectangular induction coil 1604 is matched with a rectangular magnetizer 1605.
The upper side of the support frame 4 is provided with a round hole which is in clearance fit with the first support shaft 15, and the lower end of the round hole is provided with a rectangular through hole which is in sliding fit with the second support shaft 21.
Before welding, a support frame 4 is placed between welding seams of a tube blank 3 in advance, the height of a rack 13 is adjusted to a proper position through a hydraulic jacking device 12, meanwhile, two hydraulic cylinders 6 are used for pushing the axial extension of a hydraulic telescopic arm 14 to adjust the inclination angle of the support frame and the axial position of the support frame along the tube blank 3, and a first disc-shaped induction coil 11 and a second disc-shaped induction coil 10 on the support frame are ensured to cover the side walls of the welding seams; two edge heating modules 16 at the left end of the support frame 4 are respectively arranged at the upper end and the lower end of the side face of the welding seam of the tube blank 3, and the edge heating modules 16 are screwed and fixed by long-shaft bolts 1602 and nuts 1603.
When the device works, the side wall of the welding seam is preheated by the edge heating module 16, the edge temperature and the resistance of the side wall of the welding seam are improved, the first disc-shaped induction coil 11 carries out first comprehensive induction heating on the side wall of the welding seam, then the first pair of infrared thermometers 19 behind the first disc-shaped induction coil 11 detects the temperature of the side wall of the welding seam, the numerical control operating platform 2 controls the servo motor 801 in the first local induction heating device 20 to move according to the distribution condition of the temperature of the welding seam, the L-shaped induction heating coil 804 moves along the vertical direction of the side wall of the welding seam, the low-temperature part of the side wall of the welding seam is heated, after the side wall of the welding seam is supplemented with heat by the first local induction heating device 20, the side wall of the welding seam is subjected to induction heating by the second disc-shaped induction coil 10, the temperature of the side wall of the welding seam is improved to be welded, and the temperature of the side wall of the welding seam is detected by the second pair of infrared thermometers 9 after the welding seam is heated by the second disc-shaped induction coil 10, the numerical control operating platform 2 controls the servo motor 801 in the second local induction heating device 8 to move according to the distribution condition of the temperature of the welding seam, so that the L-shaped induction heating coil 804 moves along the vertical direction of the side wall of the welding seam, the low-temperature part of the side wall of the welding seam is heated, and the temperature of the side wall of the welding seam is uniform.
Fig. 8 shows a welding process for thick-walled pipes according to the present invention, which is described in detail below:
step S1, in the numerical control operation table 2, setting the heating allowable surface temperature difference delta T of the device to be 40 ℃, the rotating linear speed V of the compression roller 1 to be 5m/min, and the length S of the pipe to be welded020m, welding temperature T01460 deg.C, first disc-shaped induction coil power P130KW, second disc induction coil power P2＝30KW；
Step S2, as shown in FIG. 6, the numerical control operating platform 2 drives the hydraulic jacking device 12 to adjust the height of the frame 13 according to the shaft diameter of the tube blank 3 to be welded; the pressing roller 1 presses and fixes the tube blank 3, so that the welding seam is vertically upward and the support frame 4 is arranged on the symmetrical plane of the welding seam; the numerical control operating platform 2 controls the two hydraulic cylinders 6 to extend L1 and L2 respectively, so that the support frame 4 translates on the symmetry plane of the welding seam along the axial direction of the crankshaft of the hydraulic cylinders 6 and rotates an angle theta to be the same as the pressing deformation inclination angle theta of the welding seam in the tube blank 3, and the steps ensure that the first disc-shaped induction coil 11 and the second disc-shaped induction coil 10 on the support frame 4 cover the side wall of the welding seam of the tube blank 3; adjusting two edge heating modules 16 on the left side of the support frame 4 to be positioned on the upper side and the lower side of the side wall of the weld joint of the tube blank 3, and screwing and fixing the two edge heating modules 16 by long-shaft bolts 1602 and nuts 1603;
step S3, connecting the rectangular induction coils 1604 in the two edge heating modules 16, and heating the upper and lower sides of the side wall of the welding seam of the tube blank 3 after magnetism is gathered by the rectangular magnetizer 1605, so as to increase the temperature of the upper and lower ends of the side wall of the welding seam, thereby increasing the resistance of the upper and lower ends of the side wall of the welding seam and reducing the eddy current density of the edge of the side wall of the welding seam in later induction heating;
step S4, the first disc-shaped induction coil 11 on the right side of the edge heating module 16 carries out first full heating on the side wall of the weld joint of the preheated pipe blank 3, the numerical control operating platform 2 starts to record the heating time T, the first pair of infrared thermometers 19 measures the temperature of the side wall of the weld joint and the distribution condition thereof, and as shown in FIG. 7, T is obtainedmax＝863℃、TminAt 831 ℃, the numerical control console 2 calculates the temperature difference | T of the surface of the welding seam according to the temperature measured by the first pair of infrared thermometers 19max-Tmin|＝ΔT132 deg.C, surface temperature difference Delta T1<Δ T, the first local induction device 20 is in standby;
step S5, the second disc-shaped induction coil 10 carries out the second full heating to the side wall of the welding seam of the tube blank 3, and the second pair of infrared thermometers 9 measures the temperature and the distribution condition of the side wall of the welding seam of the tube blank 3, as shown in figure 8, T is obtainedmax＝1470℃、Tmin1410 ℃, due to | Tmax-T0|＝ΔT 210 ℃ < Δ T, second disc-shaped induction coil 10 power P2The change is not changed;the numerical control operation table 2 calculates the temperature difference | T of the surface of the welding seam according to the temperature measured by the second pair of infrared thermometers 9min-T0If the temperature is greater than delta T at 50 ℃, the numerical control operating platform 2 controls the radial extension h of the servo motor 801 in the second local induction heating device 8 according to the welding seam temperature distribution condition of the second pair of infrared thermometers 9 as shown in fig. 6 and 82So that the L-shaped induction coil 804 moves vertically along the side wall of the welding seam to form the side surface B of the welding seam of the tube blank 32、C2Heating the middle low-temperature part at a fixed point;
and step S6, when t is 4min, v multiplied by t is 20m or more and 20m or less, and welding is stopped.
The position layout of the welding support frame is adjusted through the numerical control operating platform so as to adapt to welding of different tube blanks, meanwhile, closed-loop control of the welding seam temperature is achieved through infrared thermometer surveying and mapping, numerical control operating platform calculation and disc-shaped induction coil power adjustment, and the degree of automation is high during welding; in the aspect of a heating mode, the transverse magnetic flux heating mode adopted by the invention enables the magnetic field generated by the coil to be concentrated at the welding seam, the concentrated heating efficiency of the magnetic field energy is high, and the condition of uneven heating temperature caused by the proximity effect and the circular ring effect in the traditional induction heating is effectively reduced by adopting the uneven and gradient heating method.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a thick-walled pipe side direction response transversal welding device which characterized in that: the device comprises a press roller, a numerical control operating platform, a support frame, an end cover, a hydraulic cylinder, a first pair of local induction heating devices, a first pair of infrared thermometers, a second pair of local induction heating devices, a second pair of infrared thermometers, a first disc-shaped induction coil, a second disc-shaped induction coil, a rack, a hydraulic jacking device, a hydraulic telescopic arm, a support shaft, an edge heating module and a coupling block; the pressing roller presses and pushes the pipe blank to be welded for transmission; the support frame is arranged in the center of a welding seam of the tube blank to be welded and has the same distance with two side surfaces of the welding seam; a first disc-shaped induction coil, a second disc-shaped induction coil, an edge heating module, a first pair of local induction heating devices, a first pair of infrared thermometers, a second pair of local induction heating devices, a second pair of infrared thermometers and a coupling module are fixedly arranged on the supporting frame; a numerical control operating platform is fixedly arranged at the front end part of the rack, and the tail part of the rack is connected with a hydraulic jacking device; the left side of the rack is fixedly provided with two hydraulic cylinders, and the front end parts of the two hydraulic cylinders are connected with the left end of the hydraulic telescopic arm; the right ends of the two hydraulic telescopic arms are connected with the coupling block, and the coupling block is fixedly connected with the support frame through a first support shaft and a second support shaft; the first support shaft and the second support shaft can translate in the transverse sliding groove at the front end of the rack, end covers are arranged on two sides of the first support shaft and the second support shaft, and the end covers are arranged on the outer side of the transverse sliding groove at the front end of the rack;
two edge heating modules are fixedly arranged in a sliding groove between the upper bracket and the lower bracket on the left side of the supporting frame; a first disc-shaped induction coil is arranged on the right side of the edge heating module, and the bottom of the first disc-shaped induction coil is fixedly connected with a lower support of the support frame; a first pair of infrared thermometers are arranged on an upper support of the support frame on the right upper side of the first disc-shaped induction coil, and a first local induction heating device is arranged on the right side of the first pair of infrared thermometers; a second disc-shaped induction coil is arranged on the right side of the first local induction heating device and is fixedly connected with the lower support of the support frame; and a second pair of infrared thermometers are arranged on the upper support of the support frame at the upper right side of the second disc-shaped induction coil, and a second local induction heating device is arranged at the right side of the second pair of infrared thermometers.
2. The thick-walled pipe lateral induction butt welding apparatus according to claim 1, wherein: a round hole at the front end of the coupling block is concentric with a round hole of a rectangular open slot at the upper end of the support frame, and the coupling block and the first support shaft form rotary fit; the first support shaft and the transverse sliding chute at the front end part of the rack form sliding fit, so that the first support shaft can translate in the sliding chute under the pushing of the hydraulic cylinder; the round hole in the support frame upside forms clearance fit with first supporting shaft, and the round hole lower extreme is equipped with the rectangle through-hole, forms sliding fit with second supporting shaft.
3. The thick-walled pipe lateral induction butt welding apparatus according to claim 1, wherein: the edge heating module comprises an embedded sliding block, a long shaft bolt, a nut, a rectangular induction coil and a rectangular magnetizer; the embedded sliding block can slide in a sliding groove between the upper bracket and the lower bracket on the left side of the supporting frame; the long shaft bolt and the nut are used for fixing the embedded sliding block on the supporting frame; the right end face of the embedded sliding block is provided with the rectangular induction coil, and the rectangular induction coil is matched with the rectangular magnetizer.
4. The thick-walled pipe lateral induction butt welding apparatus according to claim 1, wherein: the local induction heating device comprises a servo motor, a screw rod, a push-pull type sliding block, an L-shaped induction coil and a magnetizer; the servo motor is fixedly arranged at the upper end of the support frame; the screw rod is arranged on the lower side of the servo motor; the screw rod is slidably mounted with the push-pull type; the lower end of the push-pull sliding block is provided with the L-shaped induction coil; the L-shaped induction coil is provided with the magnetizer.
5. The thick-walled pipe lateral induction butt welding apparatus according to claim 1, wherein: the two infrared thermometers on the left side of the support frame measure the temperature of the side wall on the right side of the tube blank, and the two infrared thermometers on the right side of the support frame measure the temperature of the side wall on the left side of the tube blank; the support frame is arranged in the center of a welding seam at the upper end of the tube blank, and the distance between the support frame and the left side wall and the distance between the support frame and the right side wall of the welding seam of the tube blank are the same.
6. A welding method for lateral induction straight seam welding of a thick-wall pipe is characterized by comprising the following steps: which comprises the following steps:
step S1: setting heating temperature difference delta T and welding temperature T of side wall of welding seam0Length S of tube blank0First disc-shaped induction coil power P1Second disc-shaped induction coil power P2The linear speed V of the rotation of the compression roller;
step S2: the numerical control operating platform controls the hydraulic jacking device to adjust the height position of the frame according to the size of the thick-walled pipe; controlling hydraulic telescopic arms at the front ends of the two hydraulic cylinders to respectively extend L1 and L2 according to the size of an opening angle of a welding seam and the deformation degree of a pipe blank at the welding seam, so as to realize the adjustment of the axial displacement and the horizontal inclination angle of the support frame on the pipe blank, ensure that a first disc-shaped induction coil and a second disc-shaped induction coil on the support frame are arranged in the center of the side wall of the pipe blank, and enable an upper support and a lower support of the support frame to be parallel to the side line of the side wall of the pipe;
step S3: electrifying the rectangular induction coil, and preheating the upper side and the lower side of the side wall of the welding seam through the magnetizer; the temperature and the resistivity of the upper side and the lower side of the side wall of the welding seam are improved, and the eddy current density of the edge of the welding seam during later induction heating is reduced;
step S4: a first disc-shaped induction coil is connected to carry out first comprehensive heating on the inner side of the welding seam; the numerical control console starts to record heating time t, and the temperature distribution of the side wall of the welding seam after being heated by the first disc-shaped coil are measured by a first pair of infrared thermometers on the supporting frame; calculating the temperature difference of the side wall of the welding seam by a numerical control operation table, and the temperature difference Tmax-Tmin|＝ΔT1If the temperature difference of the side wall is delta T1If the temperature is more than or equal to delta T, controlling the first local induction heating device to heat the low-temperature part on the side surface of the welding seam of the tube blank; if surface temperature difference is Delta T1If the current time is less than delta T, the first local induction heating device is in standby;
step S5: a second disc-shaped induction coil is switched on to carry out second comprehensive heating on the welding seam, and a second pair of infrared thermometers are used for measuring the temperature of the part to be welded; the numerical control operation table calculates the temperature difference of the side wall of the welding seam and the temperature difference Tmax-T0|＝ΔT2If the surface temperature difference is Δ T2> 0 and Δ T2The power of the second disc-shaped induction coil is reduced by the numerical control operation platform when the temperature is more than or equal to delta TP2(ii) a If surface temperature difference is Delta T2< 0 and | Δ T2Power P of lifting disc-shaped induction coil of numerical control operation platform2Up to | Δ T2Delta T is less than or equal to | T; when | Δ T2When | < delta T, the numerical control operation table calculates Tmin-T0＝ΔT3If | Δ T3If the absolute value is more than or equal to delta T, controlling the second local induction heating transposition to heat the low-temperature part on the side face of the welding seam of the tube blank; if surface temperature difference is | Delta T3If the | is less than the delta T, the second local induction heating device is in standby;
step S6: calculating V multiplied by t as S; if S0If the welding speed is more than S, the device continues welding; if S0And if the temperature is less than or equal to S, stopping the device.
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