A dissimilar welding method for duplex steel and alloy steel

Abstract

The present invention discloses a dissimilar welding method of duplex steel and alloy steel, relates to the technical field of dissimilar steel welding, and aims to solve the technical problem that dissimilar welding of duplex steel and alloy steel is difficult, including using a steel pipe slotting machine to open an outer ring groove at the end of the duplex steel pipe to be welded, and an inner ring groove at the end of the alloy steel pipe to be welded, so that the bidirectional steel pipe and the alloy steel pipe form a plug-in structure, and the axial length of the outer ring groove is greater than the axial length of the inner ring groove; the end of the duplex steel pipe to be welded is plugged in with the end of the alloy steel pipe to be welded, so that the outer ring groove and the outer side of the end of the alloy steel pipe to be welded form a weld, and welding is performed at the weld. The present invention provides support by plugging the end of the duplex steel pipe to be welded with the end of the alloy steel pipe to be welded, reduces the probability of weld cracking, and the outer ring groove and the outer side of the end of the alloy steel pipe to be welded form a weld to facilitate welding, reduce the difficulty of welding primer, and solve the technical problem that dissimilar welding of duplex steel and alloy steel is difficult.

Description

Technical Field

[0001] The invention relates to the technical field of dissimilar steel welding, and more specifically to a dissimilar welding method for dual-phase steel and alloy steel. Background Art

[0002] Duplex steel is mainly composed of iron, carbon, manganese and other elements, and may contain a small amount of other alloy elements such as chromium, nickel, molybdenum, etc. Its characteristic is that different properties are achieved by changing the crystal structure inside the steel. It is mainly composed of two crystal structures, austenite and ferrite, and each accounts for about half. This dual-phase structure enables duplex steel to achieve a good balance between strength and plasticity.

[0003] An iron-carbon alloy is formed by adding one or more alloying elements, such as silicon, manganese, chromium, nickel, molybdenum, etc., to ordinary carbon steel. The type and content of the alloying elements will significantly affect the performance of the alloy steel. The microstructure of the alloy steel may vary depending on the type and content of the alloying elements, but usually it will not contain both austenite and ferrite as the two main phases.

[0004] Directly welding dissimilar steels with submerged arc welding has always been a difficult problem in the field of physical welding. Welding failures are often seen in practical applications in factories. The welding of dissimilar steel pipes is prone to cracking of the entire weld. During welding, the inside of the gap between the two steel pipes to be welded needs to be primed in advance, which places extremely high demands on the workers' welding experience. Dissimilar welding of duplex steel and alloy steel is not easy. In view of this, we propose a dissimilar welding method for duplex steel and alloy steel. Summary of the invention

[0005] The object of the present invention is to provide a method for dissimilar welding of dual-phase steel and alloy steel, so as to solve the technical problem that dissimilar welding of dual-phase steel and alloy steel is difficult.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for dissimilar welding of dual-phase steel and alloy steel, comprising the following steps:

[0007] S1. Use a steel pipe grooving machine to open an outer ring groove at the end of the duplex steel pipe to be welded, and an inner ring groove at the end of the alloy steel pipe to be welded, so that the bidirectional steel pipe and the alloy steel pipe form a plug-in structure, and the axial length of the outer ring groove is greater than the axial length of the inner ring groove.

[0008] S2. Connect the end of the duplex steel pipe to be welded with the end of the alloy steel pipe to be welded, so that a weld is formed between the outer ring groove and the outer side of the end of the alloy steel pipe to be welded.

[0009] S3. Welding at the weld. The present invention uses a steel pipe slotting machine to open an outer ring groove at the end of the duplex steel pipe to be welded, and an inner ring groove at the end of the alloy steel pipe to be welded, so that the bidirectional steel pipe and the alloy steel pipe form a plug-in structure, and the axial length of the outer ring groove is greater than the axial length of the inner ring groove; the end of the duplex steel pipe to be welded and the end of the alloy steel pipe to be welded are plugged in to provide support, reducing the difficulty of welding priming, so that the outer ring groove and the outer side of the end of the alloy steel pipe to be welded form a weld, and welding is performed at the weld, which is convenient for welding, and solves the technical problem that dissimilar welding of duplex steel and alloy steel is difficult.

[0010] Preferably, in step S1, the steel pipe slotting machine includes a base, a mounting groove is provided on one side of the top of the base, a translation mechanism is arranged in the mounting groove, an annular slotting mechanism is arranged on the movable end of the translation mechanism, a motion state adjustment mechanism is arranged on the annular slotting mechanism, and two axis positioning clamping mechanisms are fixedly provided in a linear structure on the other side of the top of the base, and the two axis positioning clamping mechanisms are connected by a linkage mechanism; the translation mechanism is a screw moving structure; the annular slotting mechanism has a slot diameter adjustment rotation state and a slotting rotation state; the annular slotting mechanism includes an L-shaped seat, and the L-shaped seat The L-shaped seat is fixedly provided at the movable end of the translation mechanism, the head end of the L-shaped seat is fixedly provided with a motor A, the head end of the L-shaped seat is rotatably connected with a coupling shaft relative to the position of the motor A, the head end of the coupling shaft is fixedly connected with the output shaft of the motor A, the tail end of the coupling shaft is fixedly provided with a slotted component A, a swivel seat is arranged in the gap between the slotted component A and the head end of the L-shaped seat, the swivel seat is fixedly connected with the bottom end of the L-shaped seat, a swivel hole is provided on the swivel seat, a slotted component B is arranged at the tail end of the slotted component A, a shield is fixedly provided at the tail end of the L-shaped seat relative to the top end of the base, and a swivel slot is provided on the coupling shaft relative to the swivel seat;

[0011] The motion state adjustment mechanism includes a linkage part, an expansion and contraction friction part and an adjustment part. The linkage part is arranged in the gap between the slotted component A and the slotted component B. The expansion and contraction friction part is rotatably arranged on the rotating hole. The friction ends of the expansion and contraction friction part are respectively frictionally matched with the surface of the rotating hole and the surface of the connecting shaft. The adjustment part is rotatably arranged on the rotating groove relative to the position of the expansion and contraction friction part.

[0012] Preferably, the slotted assembly A comprises a ring disk, which is arranged at the tail end of the coupling, and the ring disk is fixedly connected to the tail end of the coupling via a plurality of fan-shaped blocks arranged in a circular equidistant structure, the tail end of the ring disk is provided with a plurality of inclined guide grooves in a circular equidistant structure, a movable ring is movably connected to the inclined guide grooves, a circular cavity A is provided at the tail end of the ring disk relative to the gap positions of the plurality of inclined guide grooves, and an internal gear ring A is fixedly provided at the head end of the circular cavity A.

[0013] Preferably, the slotting component B includes a circular disc, which is arranged on the rear side of the ring disc, and a plurality of centripetal through grooves are opened on the circular disc relative to the plurality of the inclined guide grooves, and a movable block is slidably connected to the centripetal through grooves, and a movable rotating column is fixedly provided at the head end of the movable block, and the movable rotating column is rotatably connected to the movable ring, and both ends of the rear side of the movable block are fixedly connected to both ends of the rear side of the centripetal through grooves by a covering cloth, a milling head is fixedly provided at the rear end of the movable block, and a circular cavity B is opened at the head end of the circular disc relative to the circular cavity A, and an internal gear ring B is fixedly provided at the rear end of the circular cavity B.

[0014] Preferably, the milling head is of a cylindrical structure, and an inclined groove is provided at the tail end of the milling head toward the center.

[0015] Preferably, the linkage part includes a round block, which is arranged in the gap between the circular cavity A and the circular cavity B. A connecting plate B is fixedly provided at the head end of the round block, and a connecting plate A is fixedly provided at the tail end of the round block. The tail end of the connecting plate B is rotatably connected to a gear B through a rotating rod, and the gear B is meshed with the inner gear ring B. The head end of the connecting plate A is rotatably connected to a gear A through a rotating rod, and both ends of the gear A are respectively meshed with the inner gear ring B and the inner gear ring A.

[0016] Preferably, the expansion and contraction friction part includes a sleeve, the sleeve is rotatably arranged on the rotating hole, the sleeve is rotatably connected to the coupling, the tail end of the sleeve penetrates into the circular cavity A and is fixedly connected to the head end of the circular block, the sleeve is provided with a plurality of movable grooves relative to the positions of the plurality of sector blocks, the sector blocks are movably connected to the movable grooves, the sleeve is provided with a plurality of centripetal grooves in an annular equidistant structure relative to the position of the rotating hole, an arc block is slidably connected to the centripetal groove, an embedding groove A is provided on the outer edge surface of the arc block, a friction block A is embedded in the embedding groove A, and the The friction block A is adapted to the rotating hole, and the friction block A is frictionally matched with the rotating hole. An embedding groove B is provided on the inner edge surface of the arc block, and a friction block B is embedded in the embedding groove B. The friction block B is adapted to the surface of the coupling, and the friction block B is frictionally matched with the surface of the coupling. The head end of the sleeve is provided with a plurality of centripetal guide grooves in an annular equidistant structure relative to the positions of the plurality of centripetal slide grooves. A movable rod is movably connected to the centripetal guide groove, and the tail end of the movable rod is fixedly connected to the head end of the arc block. The surface of the head end of the sleeve is provided with a plurality of card-connecting ball grooves in an annular equidistant structure.

[0017] Preferably, the adjustment part includes an adjusting ring, which is rotatably arranged on the rotating groove, and a plurality of adjusting guide grooves are provided on the adjusting ring relative to the positions of the plurality of movable rods, and the movable rods are movably connected to the adjusting guide grooves, and a sleeve is fixedly provided at the tail end of the adjusting ring, and the sleeve is rotatably connected to the surface of the sleeve head end, and a plurality of centripetal column grooves are provided in an annular equidistant structure on the inner edge surface of the sleeve, and a movable column is movably connected to the centripetal column groove, and the movable column and the centripetal column groove are elastically connected by a spring, and a snap-in ball block is fixedly provided at the centripetal point of the movable column, and the snap-in ball block is snap-fitted with the snap-in ball groove, and an adjustment groove is provided on the surface of the adjusting ring.

[0018] The adjusting guide groove comprises an eccentric guide groove, an arc groove A is formed at an eccentric end of the eccentric guide groove, and an arc groove B is formed at a centripetal end of the eccentric guide groove.

[0019] Preferably, the axial positioning clamping mechanism includes a fixed seat, the fixed seat is fixedly mounted on the top of the base, a ring block is fixed on the fixed seat, the tail end of the ring block is provided with a plurality of centripetal grooves in an annular equidistant structure, a connecting ring is fixedly mounted on the outer edge surface of the ring block, the tail end of the connecting ring is provided with a volute ring, the volute ring is rotatably connected to the connecting ring through a swivel, the head end of the volute ring is provided with a plurality of eccentric grooves relative to the positions of the plurality of centripetal grooves, a plurality of clamping blocks are arranged in an annular equidistant structure relative to the positions of the plurality of centripetal grooves in the connecting ring, the clamping end of the clamping block is in a triangular structure, a connecting rod is rotatably connected to the clamping block, two ends of the connecting rod are respectively movably connected to the centripetal groove and the eccentric groove, the bottom end of the volute ring is meshingly connected to a worm, both ends of the fixed seat are fixedly provided with connecting seats relative to the positions of the worm, and the two ends of the worm are respectively rotatably connected to the two connecting seats.

[0020] Preferably, the linkage mechanism includes two transmission gears and a motor B, the two transmission gears are respectively fixed on the two worm gears, the two transmission gears are connected by chain transmission, the motor B is fixed at the top of the base relative to one of the worm gears, and the output shaft of the motor B is fixedly connected to the corresponding worm gear.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention uses a steel pipe grooving machine to open an outer ring groove at the end of the duplex steel pipe to be welded, and an inner ring groove at the end of the alloy steel pipe to be welded, so that the bidirectional steel pipe and the alloy steel pipe form a plug-in structure, and the axial length of the outer ring groove is greater than the axial length of the inner ring groove; the end of the duplex steel pipe to be welded and the end of the alloy steel pipe to be welded are plugged in to provide support, which reduces the difficulty of welding primer, so that a weld is formed between the outer ring groove and the outer side of the end of the alloy steel pipe to be welded, and welding is performed at the weld, which is convenient for welding, and solves the technical problem that dissimilar welding of duplex steel and alloy steel is difficult.

[0023] 2. The present invention adopts a structural design of the annular grooving mechanism 4, and uses a shield plate 48 to prevent waste chips from falling onto the translation mechanism 3 and affecting the operation of the translation mechanism 3. The shield cloth 479 prevents waste chips from entering the centripetal groove 472. In addition, when the disc 471 and the ring disc 441 rotate in the same direction, the positions of the plurality of milling heads 475 are relatively fixed and rotate together, so that the end of the duplex steel pipe to be welded or the end of the alloy steel pipe to be welded can be grooved. When the disc 471 and the ring disc 441 rotate in opposite directions, the movable ring 444 and the movable block 473 are adapted to move on the inclined guide groove 443 and the centripetal groove 472 respectively, so that the ring diameter surrounded by the plurality of milling heads 475 changes relatively, which are respectively used to groove the ends of the duplex steel pipe to be welded or the ends of the alloy steel pipe to be welded of different diameters, thereby improving the functionality of the present invention.

[0024] 3. The present invention further designs the milling head 475 so that the milling head 475 can open an outer ring groove with a trapezoidal cross-section at the end of the duplex steel pipe to be welded, and open an annular groove with a triangular cross-section on the outside of the end of the alloy steel pipe to be welded, so that when the end of the duplex steel pipe to be welded and the end of the alloy steel pipe to be welded are plugged in, the weld formed by the outer ring groove and the outside of the end of the alloy steel pipe to be welded is in the shape of an isosceles trapezoid, which further facilitates the workers' welding at the weld, and improves the welding surface of the end of the duplex steel pipe to be welded and the end of the alloy steel pipe to be welded, thereby improving the welding strength.

[0025] 4. The present invention adopts the structural design of the adjustment part 53, so that the tool is inserted into the adjustment groove 538 and rotated, driving the adjustment ring 531 and the collar 533 to rotate, and the movable rod 5210 adapts to the movement in the gap between the adjustment guide groove 532 and the centripetal guide groove 529, so that the arc block 524 slides along the centripetal slide groove 523, and the positions of several arc blocks 524 are adjusted at the same time, which is convenient for adjustment. Through the further design of the adjustment guide groove 532, when the movable rod 5210 moves to the arc groove A5322 or the arc groove B5323, the several friction blocks A526 are squeezed and rubbed with the rotating hole 46 or the several friction blocks A526. 26 are squeezed and rubbed with the connecting shaft 43, and the reaction force cannot cause the arc groove A5322 or the arc groove B5323 to form relative rotation, thereby ensuring the effect of squeezing and friction, and through further design of the ring 533, when the friction block A526 is squeezed and rubbed with the connecting shaft 43, it is used to open the ring groove of the end of the duplex steel pipe to be welded or the end of the alloy steel pipe to be welded. At this time, the clamping ball block 537 is clamped with the clamping ball groove 5211 to prevent the adjusting ring 531 from self-rotating during high-speed rotation, thereby further improving the stability of the relatively fixed structure formed by the sleeve 521, the round block 511 and the connecting shaft 43. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the steel pipe slotting machine of the present invention in use;

[0027] Figure 2It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the annular slotting mechanism of the present invention;

[0029] Figure 4 for Figure 3 Explosion diagram of some structures;

[0030] Figure 5 for Figure 3 A schematic diagram of a partial structural cross section;

[0031] Figure 6 for Figure 3 Schematic diagram of some structures;

[0032] Figure 7 It is an exploded schematic diagram of the motion state adjustment mechanism structure of the present invention;

[0033] Figure 8 It is a schematic diagram of the cross-sectional structure of the adjustment part of the present invention;

[0034] Fig. 9 It is a schematic diagram of the structure of the axis positioning clamping mechanism and the linkage mechanism of the present invention;

[0035] Fig.10 It is a schematic diagram of the exploded structure of the axis positioning clamping mechanism of the present invention;

[0036] Fig.11 It is a structural schematic diagram of the milling head of the present invention when grooving a duplex steel pipe;

[0037] Fig.12 It is a structural schematic diagram of the milling head of the present invention when grooving an alloy steel pipe;

[0038] Fig.13 The present invention is a structural schematic diagram of the step S2 of plugging the end of the duplex steel pipe to be welded with the end of the alloy steel pipe to be welded.

[0039] Description of the numbers in the figure:

[0040] 1. Base; 2. Mounting slot; 3. Translation mechanism; 4. Annular slotting mechanism; 5. Movement state adjustment mechanism; 6. Axis center positioning clamping mechanism; 7. Linkage mechanism;

[0041] 41. L-shaped seat; 42. Motor A; 43. Coupling shaft; 44. Slot assembly A; 45. Rotating seat; 46. Rotating hole; 47. Slot assembly B; 48. Shield; 49. Rotating slot;

[0042] 51. Linking part; 52. Expansion and contraction friction part; 53. Adjustment part;

[0043] 441, ring disk; 442, sector block; 443, oblique guide groove; 444, movable ring; 445, circular cavity A; 446, inner gear ring A;

[0044] 471, disc; 472, centripetal groove; 473, movable block; 474, movable rotating column; 475, milling head; 476, circular cavity B; 477, inner gear ring B; 478, inclined groove; 479, cover cloth;

[0045] 511, round block; 512, connecting plate B; 513, connecting plate A; 514, gear B; 515, gear A;

[0046] 521, sleeve; 522, movable groove; 523, centripetal slide groove; 524, arc block; 525, embedded groove A; 526, friction block A; 527, embedded groove B; 528, friction block B; 529, centripetal guide groove; 5210, movable rod; 5211, card-connecting ball groove;

[0047] 531, adjusting ring; 532, adjusting guide groove; 533, sleeve ring; 534, centripetal column groove; 535, movable column; 536, spring; 537, clamping ball block; 538, adjusting groove;

[0048] 60, eccentric groove; 61, fixed seat; 62, ring block; 63, connecting ring; 64, swivel; 65, clamping block; 66, connecting rod; 67, worm; 68, connecting seat; 69, centripetal groove; 610, worm ring;

[0049] 71. Transmission gear; 72. Chain; 73. Motor B;

[0050] 5321. Eccentric guide groove; 5322. Arc groove A; 5323. Arc groove B. DETAILED DESCRIPTION

[0051] like Figures 1 to 13 As shown, the present invention relates to a dissimilar welding method of dual-phase steel and alloy steel, comprising the following steps:

[0052] S1. Use a steel pipe grooving machine to open an outer ring groove at the end of the duplex steel pipe to be welded, and an inner ring groove at the end of the alloy steel pipe to be welded, so that the bidirectional steel pipe and the alloy steel pipe form a plug-in structure, and the axial length of the outer ring groove is greater than the axial length of the inner ring groove.

[0053] S2. Connect the end of the duplex steel pipe to be welded with the end of the alloy steel pipe to be welded, so that a weld is formed between the outer ring groove and the outer side of the end of the alloy steel pipe to be welded.

[0054] S3. Welding is performed at the weld seam.

[0055] In an embodiment of the present invention, the steel pipe slotting machine comprises a base 1, a mounting groove 2 is provided on one side of the top of the base 1, and a translation mechanism 3 is arranged in the installation groove 2; the translation mechanism 3 is a screw rod moving structure.

[0056] In an embodiment of the present invention, an annular slotting mechanism 4 is arranged at the movable end of the translation mechanism 3, and the annular slotting mechanism 4 has a slot diameter adjustment rotation state and a slotting rotation state; the annular slotting mechanism 4 includes an L-shaped seat 41, the L-shaped seat 41 is fixedly arranged at the movable end of the translation mechanism 3, a motor A42 is fixedly arranged at the head end of the L-shaped seat 41, a connecting shaft 43 is rotatably connected to the head end of the L-shaped seat 41 relative to the motor A42, the head end of the connecting shaft 43 is fixedly connected to the output shaft of the motor A42, a slotting component A44 is fixedly arranged at the tail end of the connecting shaft 43, a swivel seat 45 is arranged in the gap between the slotting component A44 and the head end of the L-shaped seat 41, the swivel seat 45 is fixedly connected to the bottom end of the L-shaped seat 41, a swivel hole 46 is opened on the swivel seat 45, a slotting component B47 is arranged at the tail end of the slotting component A44, a baffle 48 is fixedly arranged at the tail end of the L-shaped seat 41 relative to the top end of the base 1, and a swivel groove 49 is opened at the position of the connecting shaft 43 relative to the swivel seat 45.

[0057] In an embodiment of the present invention, the slotting component A44 includes a ring disk 441, which is arranged at the tail end of the connecting shaft 43. The ring disk 441 and the tail end of the connecting shaft 43 are fixedly connected by a plurality of fan-shaped blocks 442 arranged in a ring-shaped equal-spaced structure. The tail end of the ring disk 441 is provided with a plurality of inclined guide grooves 443 in a ring-shaped equal-gap structure. A movable ring 444 is movably connected to the inclined guide grooves 443. A circular cavity A445 is provided at the tail end of the ring disk 441 relative to the gap position of the plurality of inclined guide grooves 443. An internal gear ring A446 is fixedly provided at the head end of the circular cavity A445.

[0058] In an embodiment of the present invention, the slotting component B47 includes a disc 471, which is arranged on the rear side of the ring disc 441. A number of centripetal through grooves 472 are opened on the disc 471 relative to the number of inclined guide grooves 443. A movable block 473 is slidably connected to the centripetal through groove 472. A movable rotating column 474 is fixedly provided at the head end of the movable block 473. The movable rotating column 474 is rotatably connected to the movable ring 444. The two ends of the rear side of the movable block 473 are fixedly connected to the two ends of the rear side of the centripetal through groove 472 by a covering cloth 479. A milling head 475 is fixedly provided at the rear end of the movable block 473. A circular cavity B476 is opened at the head end of the disc 471 relative to the circular cavity A445. An internal gear ring B477 is fixedly provided at the rear end of the circular cavity B476. The present invention adopts the structural design of the annular grooving mechanism 4, and uses the shield plate 48 to prevent waste chips from falling onto the translation mechanism 3 and affecting the operation of the translation mechanism 3, and uses the shield cloth 479 to prevent waste chips from entering the centripetal groove 472. In addition, when the motor A42 is controlled to rotate by the external control mechanism, the connecting shaft 43 drives the ring disk 441 to rotate through a plurality of fan-shaped blocks 442. When the circular disk 471 and the ring disk 441 rotate in the same direction, the positions of the plurality of milling heads 475 are relatively fixed and rotate together, so that the end of the duplex steel pipe to be welded or the end of the alloy steel pipe to be welded can be grooved. When the circular disk 471 and the ring disk 441 rotate in opposite directions, the movable ring 444 and the movable block 473 respectively adapt to the activities on the inclined guide groove 443 and the centripetal groove 472, so that the ring diameter surrounded by the plurality of milling heads 475 changes relatively, which are respectively used to groove the ends of the duplex steel pipe to be welded or the ends of the alloy steel pipe to be welded of different diameters, thereby improving the functionality of the present invention.

[0059] In the embodiment of the present invention, the milling head 475 is a columnar structure, and an inclined groove 478 is provided at the tail end of the milling head 475. Fig.11 , Fig.12 and Fig.13 As shown, the milling head 475 can open an outer ring groove with a trapezoidal cross-section at the end of the duplex steel pipe to be welded, and open an annular groove with a triangular cross-section on the outside of the end of the alloy steel pipe to be welded, so that when the end of the duplex steel pipe to be welded and the end of the alloy steel pipe to be welded are plugged in, the weld formed by the outer ring groove and the outside of the end of the alloy steel pipe to be welded is in the shape of an isosceles trapezoid, which further facilitates the workers' welding at the weld and improves the welding surface of the end of the duplex steel pipe to be welded and the end of the alloy steel pipe to be welded, thereby improving the welding strength.

[0060] In the embodiment, a motion state adjustment mechanism 5 is arranged on the annular slotting mechanism 4, and the motion state adjustment mechanism 5 includes a linkage part 51, an expansion and contraction friction part 52 and an adjustment part 53. The linkage part 51 is arranged in the gap between the slotting component A44 and the slotting component B47. The linkage part 51 includes a round block 511, and the round block 511 is arranged in the gap between the circular cavity A445 and the circular cavity B476. A connecting plate B512 is fixedly provided at the head end of the round block 511, and a connecting plate A512 is fixedly provided at the tail end of the round block 511. 13. The tail end of the connecting plate B512 is rotatably connected to a gear B514 through a rotating rod, and the gear B514 is meshed with the inner gear ring B477. The head end of the connecting plate A513 is rotatably connected to a gear A515 through a rotating rod, and the two ends of the gear A515 are respectively meshed with the inner gear ring B477 and the inner gear ring A446; the expansion and contraction friction part 52 is rotatably arranged on the rotating hole 46, and both sides of the friction end of the expansion and contraction friction part 52 are frictionally matched with the surface of the rotating hole 46 and the surface of the connecting shaft 43;

[0061] The expansion and contraction friction part 52 includes a sleeve 521, which is rotatably arranged on the rotating hole 46, and the sleeve 521 is rotatably connected to the connecting shaft 43. The tail end of the sleeve 521 penetrates the circular cavity A445 and is fixedly connected to the head end of the round block 511. A plurality of movable grooves 522 are provided on the sleeve 521 relative to the plurality of sector blocks 442. The sector blocks 442 are movably connected to the movable grooves 522. The sleeve 521 is provided with a plurality of centripetal grooves 523 in an annular equidistant structure relative to the rotating hole 46. An arc block 524 is slidably connected to the centripetal groove 523. An embedded groove A525 is provided on the outer edge surface of the arc block 524. A friction block A526 is embedded in the embedded groove A525. The friction block A526 is adapted to the rotating hole 46, and the friction block A526 is frictionally matched with the rotating hole 46. An embedding groove B527 is provided on the inner edge surface of the arc block 524, and a friction block B528 is embedded in the embedding groove B527. The friction block B528 is adapted to the surface of the connecting shaft 43, and the friction block B528 is frictionally matched with the surface of the connecting shaft 43. The head end of the sleeve 521 is positioned relative to the plurality of centripetal grooves 523 in an annular structure with equal spacing to form a plurality of centripetal guide grooves 529. A movable rod 5210 is movably connected to the centripetal guide groove 529, and the rear end of the movable rod 5210 is fixedly connected to the head end of the arc block 524. The head end surface of the sleeve 521 is annular structure with equal spacing to form a plurality of card-connecting ball grooves 5211. The present invention adopts the above arrangement, so that when the friction blocks A526 and the rotating hole 46 are squeezed and rubbed, the friction blocks B528 and the connecting shaft 43 are separated from the connecting shaft 43, the sleeve 521 and the rotating hole 46 form a relatively fixed structure, and the sleeve 521 and the round block 511 cannot rotate. At this time, the ring disk 441 rotates to drive the inner gear ring A446 to rotate, so that the two ends of the gear A515 and the inner gear ring B477 rotate in the opposite direction, so that the inner gear ring B477 drives the disc 471 and the ring disk 441 to rotate in the opposite direction, which is used to adjust the number of milling heads 475. When a plurality of friction blocks B528 are squeezed and rubbed against the connecting shaft 43, a plurality of friction blocks A526 are separated from the rotating hole 46, so that the sleeve 521, the round block 511 and the connecting shaft 43 form a relatively fixed structure. At this time, the rotation of the ring disk 441 drives the internal gear ring A446 to rotate, and the two ends of the gear A515 are relatively fixed to the internal gear ring B477 and revolve with the internal gear ring A446, so that the internal gear ring B477 drives the disc 471 and the ring disk 441 to rotate in the same direction, which is used for opening the ring groove at the end of the duplex steel pipe to be welded or the end of the alloy steel pipe to be welded.

[0062] In the embodiment of the present invention, the adjusting portion 53 is rotatably arranged on the rotating groove 49 relative to the position of the expansion and contraction friction portion 52. The adjusting portion 53 includes an adjusting ring 531, which is rotatably arranged on the rotating groove 49. A plurality of adjusting guide grooves 532 are provided on the adjusting ring 531 relative to the positions of the plurality of movable rods 5210. The movable rods 5210 are movably connected with the adjusting guide grooves 532. A collar 533 is fixed at the tail end of the adjusting ring 531. The collar 533 is rotatably connected with the head end surface of the sleeve 521. The inner edge surface of the collar 533 is provided with a circular structure with equal spacing. A plurality of centripetal column grooves 534 are movably connected with movable columns 535, the movable columns 535 and the centripetal column grooves 534 are elastically connected via springs 536, a snap-in ball block 537 is fixedly provided at the centripetal point of the movable column 535, the snap-in ball block 537 is snap-fitted with the snap-in ball groove 5211, an adjusting groove 538 is provided on the surface of the adjusting ring 531, the adjusting guide groove 532 includes an eccentric guide groove 5321, an arc groove A5322 is provided at the eccentric end of the eccentric guide groove 5321, and an arc groove B5323 is provided at the centripetal end of the eccentric guide groove 5321. The present invention adopts the structural design of the adjustment part 53, so that the tool is inserted into the adjustment groove 538 and then rotated, driving the adjustment ring 531 and the collar 533 to rotate, and the movable rod 5210 adapts to the movement in the gap between the adjustment guide groove 532 and the centripetal guide groove 529, so that the arc block 524 slides along the centripetal slide groove 523, and the positions of several arc blocks 524 are adjusted at the same time, which is convenient for adjustment. By further designing the adjustment guide groove 532, when the movable rod 5210 moves to the arc groove A5322 or the arc groove B5323, several friction blocks A526 are squeezed and rubbed with the rotating hole 46 or several friction blocks A526. 6 are squeezed and rubbed with the connecting shaft 43, and the reaction force cannot cause the arc groove A5322 or the arc groove B5323 to form relative rotation, thereby ensuring the effect of squeezing and friction, and through further design of the sleeve 533, when the friction block A526 is squeezed and rubbed with the connecting shaft 43, it is used to open the ring groove of the end of the duplex steel pipe to be welded or the end of the alloy steel pipe to be welded. At this time, the clamping ball block 537 is clamped with the clamping ball groove 5211 to prevent the adjusting ring 531 from self-rotating during high-speed rotation, thereby further improving the stability of the relatively fixed structure formed by the sleeve 521, the round block 511 and the connecting shaft 43.

[0063] In the embodiment of the present invention, the other side of the top of the base 1 is fixed with two axial positioning clamping mechanisms 6 in a linear structure. The axial positioning clamping mechanism 6 includes a fixed seat 61, which is fixed on the top of the base 1. A ring block 62 is fixed on the fixed seat 61. The tail end of the ring block 62 is annular and evenly spaced. A plurality of centripetal grooves 69 are opened. A connecting ring 63 is fixed on the outer edge of the ring block 62. A volute ring 610 is provided at the tail end of the connecting ring 63. The volute ring 610 is rotatably connected to the connecting ring 63 through a rotating ring 64. The head end of the volute ring 610 is relatively A plurality of eccentric grooves 60 are provided at the position of the centripetal groove 69, and a plurality of clamping blocks 65 are arranged in a ring-shaped and equidistant structure relative to the positions of the centripetal grooves 69 in the connecting ring 63. The clamping ends of the clamping blocks 65 are in a triangular structure. A connecting rod 66 is rotatably connected to the clamping blocks 65, and the two ends of the connecting rod 66 are movably connected to the centripetal groove 69 and the eccentric groove 60 respectively. A worm 67 is meshedly connected to the bottom end of the volute ring 610, and connecting seats 68 are fixed at both ends of the fixed seat 61 relative to the position of the worm 67, and the two ends of the worm 67 are rotatably connected to the two connecting seats 68 respectively. The present invention designs the axis positioning clamping mechanism 6 so that when the worm 67 is rotated, the worm ring 610 rotates, and the plurality of eccentric grooves 60 rotate so that the two ends of the connecting rod 66 move relative to the centripetal groove 69 and the eccentric groove 60, and the clamping block 65 moves adaptively to form a new clamping cavity for clamping, fixing or disassembling the duplex steel pipe or alloy steel pipe. This structure has an automatic axis positioning function, and the worm gear structure has a self-locking function, and no additional fixation is required for adjustment, making the clamping and fixing of the duplex steel pipe or alloy steel pipe more convenient.

[0064] In the embodiment of the present invention, the two axis center positioning clamping mechanisms 6 are connected by a linkage mechanism 7; the linkage mechanism 7 includes two transmission gears 71 and a motor B73, the two transmission gears 71 are respectively fixed on the two worms 67, the two transmission gears 71 are connected by a chain 72, the motor B73 is fixed at the top of the base 1 relative to one of the worms 67, and the output shaft of the motor B73 is fixedly connected to the corresponding worm 67. Through the above arrangement, the present invention controls the rotation of the motor B73 through an external control mechanism, and the two transmission gears 71 rotate simultaneously through the transmission of the chain 72, so that the two worms 67 rotate simultaneously, which is used to simultaneously control the two axis center positioning clamping mechanisms 6 to clamp, fix or disassemble the dual-phase steel pipe or alloy steel pipe.

[0065] Working principle: This embodiment provides a dissimilar welding method for duplex steel and alloy steel. When used, follow the steps below:

[0066] S1. Adjust the ring diameter formed by the milling head 475 according to the outer ring groove of the duplex steel pipe;

[0067] Use a tool to insert the adjustment groove 538 and rotate it, driving the adjustment ring 531 and the sleeve ring 533 to rotate, and the movable rod 5210 adapts to the movement in the gap between the adjustment guide groove 532 and the centripetal guide groove 529, causing the arc block 524 to slide along the centripetal slide groove 523, and at the same time, the positions of several arc blocks 524 are adjusted, so that the movable rod 5210 moves to the arc groove A5322, several friction blocks A526 squeeze and rub against the rotating hole 46, several friction blocks B528 are separated from the connecting shaft 43, and the sleeve 521 and the rotating hole 46 form a relatively fixed structure, and the sleeve 521 and the round block 511 cannot rotate. At this time, when the motor A42 is controlled to rotate by an external control mechanism, the connecting shaft 43 drives the ring disk 441 to rotate through a plurality of sector blocks 442. The rotation of the ring disk 441 drives the internal gear ring A446 to rotate, causing the two ends of the gear A515 to rotate in the opposite direction to the internal gear ring B477, so that the internal gear ring B477 drives the disc 471 to rotate in the opposite direction to the ring disk 441. The movable ring 444 and the movable block 473 are adapted to move on the inclined guide groove 443 and the centripetal groove 472 respectively, causing the ring diameter surrounded by a plurality of milling heads 475 to change relatively, and the adjustment is appropriate.

[0068] Insert the tool into the adjustment slot 538 and rotate it, so that the movable rod 5210 moves to the arc slot B5323. According to the above principle, the friction blocks A526 are squeezed and rubbed with the connecting shaft 43, and some friction blocks A526 are separated from the rotating hole 46, so that the sleeve 521, the round block 511 and the connecting shaft 43 form a relatively fixed structure.

[0069] S2. Clamp and fix the duplex steel pipe;

[0070] The motor B73 is controlled to rotate by an external control mechanism, and the two transmission gears 71 rotate simultaneously through the transmission of the chain 72, so that the two worms 67 rotate simultaneously, the worm ring 610 rotates, and the eccentric grooves 60 rotate so that the two ends of the connecting rod 66 move relative to the centripetal groove 69 and the eccentric groove 60, and the clamping block 65 moves adaptively to form a new clamping cavity for clamping and fixing the duplex steel pipe or alloy steel pipe;

[0071] S3, with an outer ring groove of a duplex steel pipe;

[0072] The rotation of the ring disk 441 drives the inner gear ring A446 to rotate, and the two ends of the gear A515 are relatively fixed to the inner gear ring B477 and revolve with the inner gear ring A446, so that the inner gear ring B477 drives the disc 471 to rotate in the same direction as the ring disk 441. The motor A42 is controlled to rotate by an external control mechanism, and the positions of the plurality of milling heads 475 are relatively fixed and rotate together, and the translation mechanism 3 is controlled to move by an external control mechanism, so that the end of the duplex steel pipe to be welded or the end of the alloy steel pipe to be welded can be grooved, such as Fig.11 as stated;

[0073] S4, same as step S2, dismantle the duplex steel pipe and fix the alloy steel pipe;

[0074] S5, same principle as S3 and Fig.12 As shown, a triangular-shaped annular groove is opened on the outer side of the end of the alloy steel pipe to be welded;

[0075] S6. Adjust the diameter of the ring formed by the milling head 475 according to the inner ring groove of the alloy steel pipe; same as S1 principle, adjust to a suitable value;

[0076] S7, same principle as S3 and Figure 2 As shown, an inner ring groove is provided in the alloy steel pipe;

[0077] S8. Connect the end of the duplex steel pipe to be welded with the end of the alloy steel pipe to be welded, so that the outer ring groove and the outer side of the end of the alloy steel pipe to be welded form a weld in the shape of an isosceles trapezoid, such as Fig.13 As shown;

[0078] S9. Weld at the weld.

[0079] The embodiments of the present invention disclose preferred embodiments, but are not limited thereto. A person skilled in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not deviate from the spirit of the present invention, they are all within the protection scope of the present invention.

Claims

1. A method for welding dissimilar duplex steel and alloy steel, characterized in that: The following steps are involved: S1. Use a steel pipe slotting machine to open an outer ring groove at the end of the duplex steel pipe to be welded, and an inner ring groove at the end of the alloy steel pipe to be welded, so that the bidirectional steel pipe and the alloy steel pipe form a plug-in structure, and the axial length of the outer ring groove is greater than the axial length of the inner ring groove; S2, plugging the end of the duplex steel pipe to be welded with the end of the alloy steel pipe to be welded, so that a weld is formed between the outer ring groove and the outer side of the end of the alloy steel pipe to be welded; S3, welding at the weld; In step S1, the steel pipe slotting machine comprises a base (1), a mounting groove (2) is provided on one side of the top of the base (1), a translation mechanism (3) is arranged in the installation groove (2), an annular slotting mechanism (4) is arranged at the movable end of the translation mechanism (3), a motion state adjustment mechanism (5) is arranged on the annular slotting mechanism (4), and two axis positioning clamping mechanisms (6) are fixedly provided in a linear structure on the other side of the top of the base (1), and the two axis positioning clamping mechanisms (6) are connected via a linkage mechanism (7); The translation mechanism (3) is a screw rod moving structure; The annular slotting mechanism (4) has a slot diameter adjustment rotation state and a slotting rotation state; The annular slotting mechanism (4) comprises an L-shaped seat (41), the L-shaped seat (41) being fixedly mounted on the movable end of the translation mechanism (3), a motor A (42) being fixedly mounted on the head end of the L-shaped seat (41), a connecting shaft (43) being connected to the head end of the L-shaped seat (41) so as to be rotatable relative to the motor A (42), the connecting shaft (43) being fixedly mounted on the head end of the connecting shaft (43) and an output shaft of the motor A (42), a slotting component A (44) being fixedly mounted on the tail end of the connecting shaft (43), and the slotting component A A swivel seat (45) is arranged in the gap between the head end of the L-shaped seat (44) and the L-shaped seat (41); the swivel seat (45) is fixedly connected to the bottom end of the L-shaped seat (41); a swivel hole (46) is provided on the swivel seat (45); a swivel assembly B (47) is arranged at the tail end of the slot assembly A (44); a shield plate (48) is fixedly provided at the tail end of the L-shaped seat (41) relative to the top end of the base (1); and a swivel groove (49) is provided at the position of the connecting shaft (43) relative to the swivel seat (45); The motion state adjustment mechanism (5) comprises a linkage part (51), an expansion and contraction friction part (52) and an adjustment part (53); the linkage part (51) is arranged in the gap between the slotted component A (44) and the slotted component B (47); the expansion and contraction friction part (52) is rotatably arranged on the rotating hole (46); the two sides of the friction end of the expansion and contraction friction part (52) are respectively frictionally matched with the surface of the rotating hole (46) and the surface of the connecting shaft (43); the adjustment part (53) is rotatably arranged on the rotating groove (49) relative to the position of the expansion and contraction friction part (52).

2. The dissimilar welding method of dual-phase steel and alloy steel according to claim 1, characterized in that: The slotting assembly A (44) comprises a ring disk (441), the ring disk (441) being arranged at the rear end of the connecting shaft (43), the ring disk (441) being fixedly connected to the rear end of the connecting shaft (43) via a plurality of fan-shaped blocks (442) arranged in an annular structure with equal spacing, the rear end of the ring disk (441) being provided with a plurality of inclined guide grooves (443) in an annular structure with equal gaps, a movable ring (444) being movably connected to the inclined guide grooves (443), a circular cavity A (445) being provided at the rear end of the ring disk (441) at a position corresponding to the gaps between the plurality of inclined guide grooves (443), and an internal gear ring A (446) being fixedly provided at the head end of the circular cavity A (445).

3. The dissimilar welding method of dual-phase steel and alloy steel according to claim 2, characterized in that: The slotting assembly B (47) comprises a disk (471), the disk (471) being arranged at the rear side of the ring disk (441), the disk (471) being provided with a plurality of centripetal through grooves (472) opposite to the plurality of inclined guide grooves (443), a movable block (473) being slidably connected to the centripetal through grooves (472), a movable rotating column (474) being fixedly arranged at the head end of the movable block (473), the movable rotating column (474) being rotatably connected to the movable ring (444), both ends of the rear side of the movable block (473) being fixedly connected to both ends of the rear side of the centripetal through grooves (472) via a cover cloth (479), a milling head (475) being fixedly arranged at the rear end of the movable block (473), a circular cavity B (476) being provided at the head end of the disk (471) opposite to the circular cavity A (445), and an internal gear ring B (477) being fixedly arranged at the rear end of the circular cavity B (476).

4. The method for welding dissimilar dual-phase steel and alloy steel according to claim 3, characterized in that: The milling head (475) is in a columnar structure, and an inclined groove (478) is provided at the tail end of the milling head (475) toward the center.

5. The method for welding dissimilar dual-phase steel and alloy steel according to claim 4, characterized in that: The linkage part (51) comprises a round block (511), the round block (511) being arranged in a gap between the round cavity A (445) and the round cavity B (476), a connecting plate B (512) being fixedly arranged at the head end of the round block (511), a connecting plate A (513) being fixedly arranged at the tail end of the round block (511), the tail end of the connecting plate B (512) being rotatably connected to a gear B (514) via a rotating rod, the gear B (514) being meshingly connected to the inner gear ring B (477), the head end of the connecting plate A (513) being rotatably connected to a gear A (515) via a rotating rod, the two ends of the gear A (515) being respectively meshingly connected to the inner gear ring B (477) and the inner gear ring A (446).

6. The dissimilar welding method of dual-phase steel and alloy steel according to claim 5, characterized in that: The expansion and contraction friction part (52) comprises a sleeve (521), the sleeve (521) is rotatably arranged on the rotating hole (46), the sleeve (521) is rotatably connected to the connecting shaft (43), the tail end of the sleeve (521) penetrates into the circular cavity A (445) and is fixedly connected to the head end of the circular block (511), the sleeve (521) is provided with a plurality of movable grooves (522) at positions corresponding to the plurality of sector blocks (442), the sector blocks (442) are movably connected to the movable grooves (522), the sleeve (521) is provided with a plurality of centripetal grooves (523) at positions corresponding to the rotating hole (46) in an annular equidistant structure, an arc block (524) is slidably connected to the centripetal groove (523), an outer edge surface of the arc block (524) is provided with an embedding groove A (525), and a friction block A (526) is embedded in the embedding groove A (525), The friction block A (526) is adapted to the rotating hole (46), and the friction block A (526) is frictionally matched with the rotating hole (46). An embedding groove B (527) is provided on the inner edge surface of the arc block (524), and a friction block B (528) is embedded in the embedding groove B (527). The friction block B (528) is adapted to the surface of the connecting shaft (43), and the friction block B (528) is frictionally matched with the surface of the connecting shaft (43). A plurality of centripetal guide grooves (529) are provided at the head end of the sleeve (521) in an annular structure with equal spacing relative to the plurality of centripetal grooves (523). A movable rod (5210) is movably connected to the centripetal guide groove (529), and the rear end of the movable rod (5210) is fixedly connected to the head end of the arc block (524). A plurality of snap-in ball grooves (5211) are provided on the head end surface of the sleeve (521) in an annular structure with equal spacing.

7. The dissimilar welding method of dual-phase steel and alloy steel according to claim 6, characterized in that: The adjusting portion (53) comprises an adjusting ring (531), the adjusting ring (531) being rotatably arranged on the rotating groove (49), the adjusting ring (531) being provided with a plurality of adjusting guide grooves (532) at positions corresponding to the plurality of movable rods (5210), the movable rods (5210) being movably connected to the adjusting guide grooves (532), a sleeve ring (533) being fixedly arranged at the rear end of the adjusting ring (531), the sleeve ring (533) being rotatably connected to the surface of the head end of the sleeve (521), the sleeve ring (533) being rotatably arranged on the front end of the sleeve (521), and the sleeve ring (533) being rotatably connected to the front end of the sleeve (521). A plurality of centripetal column grooves (534) are provided on the inner edge surface of the ring-shaped equidistant structure, and a movable column (535) is movably connected to the centripetal column groove (534). The movable column (535) is elastically connected to the centripetal column groove (534) via a spring (536). A clamping ball block (537) is fixed to the centripetal point of the movable column (535). The clamping ball block (537) is clamped and matched with the clamping ball groove (5211). An adjusting groove (538) is provided on the surface of the adjusting ring (531); The adjustment guide groove (532) comprises an eccentric guide groove (5321), an arc groove A (5322) is provided at the eccentric end of the eccentric guide groove (5321), and an arc groove B (5323) is provided at the centripetal end of the eccentric guide groove (5321).

8. The method for dissimilar welding of dual-phase steel and alloy steel according to claim 7, characterized in that: The axis positioning clamping mechanism (6) comprises a fixed seat (61), the fixed seat (61) is fixedly mounted on the top of the base (1), a ring block (62) is fixed on the fixed seat (61), a tail end of the ring block (62) is provided with a plurality of centripetal grooves (69) in a ring-shaped structure with equal spacing, a connecting ring (63) is fixedly mounted on the outer edge surface of the ring block (62), a volute ring (610) is provided at the tail end of the connecting ring (63), the volute ring (610) is rotatably connected to the connecting ring (63) via a rotating ring (64), and a plurality of eccentric grooves (60) are provided at the head end of the volute ring (610) at positions opposite to the plurality of centripetal grooves (69). A plurality of clamping blocks (65) are arranged in a circular structure with equal spacing relative to the positions of the plurality of centripetal grooves (69) in the connecting ring (63); the clamping ends of the clamping blocks (65) are in a triangular structure; a connecting rod (66) is rotatably connected to the clamping blocks (65); two ends of the connecting rod (66) are movably connected to the centripetal groove (69) and the eccentric groove (60), respectively; a worm (67) is meshingly connected to the bottom end of the volute ring (610); two connecting seats (68) are fixedly provided at two ends of the fixed seat (61) relative to the positions of the worm (67); and two ends of the worm (67) are rotatably connected to the two connecting seats (68), respectively.

9. The method for welding dissimilar dual-phase steel and alloy steel according to claim 8, characterized in that: The linkage mechanism (7) comprises two transmission gears (71) and a motor B (73); the two transmission gears (71) are respectively fixed on the two worm gears (67); the two transmission gears (71) are connected by a chain (72); the motor B (73) is fixed on the top of the base (1) relative to one of the worm gears (67); and the output shaft of the motor B (73) is fixedly connected to the corresponding worm gear (67).

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