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CN-121988875-A - Welding method of super invar alloy workpiece

CN121988875ACN 121988875 ACN121988875 ACN 121988875ACN-121988875-A

Abstract

The application belongs to the technical field of welding, and particularly relates to a welding method of a super invar alloy workpiece. The welding method of the super invar alloy workpiece comprises the steps of butt-jointing first butt-jointed surfaces of two adjacent bottom plates to form a first joint, welding the first joint by adopting laser welding from the first side along the thickness direction of the bottom plates, wherein the first joint is provided with a first side and a second side which are arranged in a back-to-back mode, the first joint is welded, the parameters of the laser welding for welding are that the laser power is 5.6 KW-6.0 KW, the speed is 1.8 m/min-2.0 m/min, the defocusing amount is +3mm- +6mm, and the penetration depth is 5mm. The welding method of the super invar alloy workpiece can ensure the welding quality.

Inventors

  • QIAN CHUNYU
  • DING YONGHONG
  • Yu Runchen
  • WANG YI
  • XIE SHICHAO
  • LIU LIJUN
  • WANG WEIXIN
  • ZHANG QUAN
  • ZHANG RUPING
  • KANG HONGWEI
  • LIU XINYU
  • LIU JIN

Assignees

  • 湖北三江航天红阳机电有限公司

Dates

Publication Date
20260508
Application Date
20260225

Claims (10)

  1. 1. A method of welding a super invar alloy workpiece, the super invar alloy workpiece comprising a plurality of base plates, the base plates having a first interface, the method comprising: abutting first abutting faces of two adjacent bottom plates to form a first joint; The bottom plate is provided with a first side and a second side which are arranged opposite to each other along the thickness direction of the bottom plate, welding the first seam from the first side using laser welding to form a first weld; The parameters of the laser welding for welding the first joint are that the laser power is 5.6 KW-6.0 KW, the speed is 1.8 m/min-2.0 m/min, the defocusing amount is +3mm- +6mm, and the penetration depth is 5mm.
  2. 2. The welding method of claim 1, wherein the base plate comprises a first body, a first boss coupled to the first body, the first boss being located on the second side, and a fourth boss coupled to the first body, the fourth boss being located on the first side, the first boss and the fourth boss each being flush with the first mating surface.
  3. 3. The welding method according to claim 1, wherein a plurality of studs arranged at intervals are arranged on each bottom plate, the studs are positioned on the second side, the studs are provided with second butt joint surfaces, and the studs on two adjacent bottom plates are in one-to-one correspondence; When two adjacent bottom plates are butted, the second butt joint surfaces of the two corresponding studs are butted to form a second joint; the stud has third and fourth sides disposed opposite each other in a thickness direction of the stud, performing double-sided welding on the second joint by adopting laser welding from the third side and the fourth side respectively to form a second welding seam; The parameters of the laser welding for welding the second joint are that the laser power is 4.8 KW-5.0 KW, the speed is 3.5 m/min-3.7 m/min, the defocusing amount is +3mm- +6mm, and the single-sided penetration is 2.7mm.
  4. 4. A welding method according to claim 3, wherein the stud comprises a second body, a second boss and a third boss, both of which are connected to the second body; the second boss is located the third side, the third boss is located the fourth side, the second boss with the third boss with the second butt joint face parallel and level.
  5. 5. A welding method according to claim 3, wherein the inclination angle of the welding gun of the laser welding is 40 ° to 42 ° when welding the second weld bead.
  6. 6. A welding method according to claim 3, wherein, when welding the second weld bead, an arc is struck from the root position of the stud.
  7. 7. A welding method according to claim 3, characterized in that the welding method further comprises: Before the first joint and the second joint are welded, positioning welding is carried out on the first joint; After the positioning welding of the first joint is finished, positioning welding is carried out on the second joint positioned in the middle of the first joint, and then, skip welding positioning welding is carried out on the second joints positioned on two sides of the second joint in the middle of the first joint along the length direction of the first joint.
  8. 8. A welding method according to claim 3, characterized in that: continuously welding the first joint in a segmented manner to form a plurality of first sub-welds arranged at intervals; Performing symmetrical skip welding continuous welding on the second joint along the length direction of the first joint at the third side and/or the fourth side so as to form a plurality of second welding seams; When the number of the second welding seams reaches 40% -60% of the number of the second welding seams, continuously welding the intervals of two adjacent first sub-welding seams to form a plurality of second sub-welding seams arranged at intervals, wherein the first welding seams and the second welding seams form the first welding seams; Performing symmetrical skip welding continuous welding on the rest second joints on the third side to form second welding joints; And on the fourth side, performing symmetrical skip welding continuous welding on the rest second joints along the length direction of the first joints so as to form a plurality of second welding joints.
  9. 9. The welding method according to claim 8, wherein when the number of the first joints is four or more, the welding of the first joints is performed in accordance with a symmetry principle.
  10. 10. A welding method according to claim 3, wherein two coamings are arranged on the bottom plate, the two coamings are located on the second side, a plurality of studs are located between the two coamings, the plurality of coamings on the adjacent two bottom plates are in one-to-one correspondence, the coamings are provided with a third butt joint surface, and grooves are formed in the ends of the coamings, which are away from the studs; when two adjacent bottom plates are butted, the third butt joint surfaces of the two corresponding coamings are butted to form a third joint; welding the third joint by adopting the laser welding; argon arc welding is carried out on the groove; After the coaming plates on the two bottom plates are welded, annealing and stabilizing the workpiece under inert protective atmosphere; the parameters of the laser welding for welding the third joint are that the laser power is 8.5 KW-8.7 KW, the speed is 1.5 m/min-1.8 m/min, the defocusing amount is-6 mm-8 mm, and the penetration depth is 9.5mm.

Description

Welding method of super invar alloy workpiece Technical Field The application belongs to the technical field of welding, and particularly relates to a welding method of a super invar alloy workpiece. Background The super invar alloy is an iron-nickel-cobalt base alloy with an ultralow expansion coefficient, has a very low and stable thermal expansion coefficient, and is very suitable for being used in scenes extremely sensitive to dimensional changes caused by thermal expansion and cold contraction. Due to product requirements, super invar alloys are used. Because of the high cost of the super invar alloy, the super invar alloy is not generally machined integrally for reducing the cost, and is not easy to machine because of the material property of the super invar alloy. Therefore, for product molding, welding is generally selected. However, in the related art, the welding difficulty is high due to the material of the super invar alloy. Disclosure of Invention In order to solve the technical problems, the invention provides a welding method of a super invar alloy workpiece, which aims to at least solve the technical problems of great welding difficulty caused by the material reason of the super invar alloy to a certain extent. The technical scheme of the invention is as follows: A welding method of a super invar alloy workpiece comprises the steps of butting first butting surfaces of two adjacent bottom plates to form a first joint, welding the first joint by adopting laser welding on the first side along the thickness direction of the bottom plates, wherein the parameters of the laser welding on the first joint are that the laser power is 5.6 KW-6.0 KW, the speed is 1.8 m/min-2.0 m/min, the defocusing amount is +3mm- +6mm, and the penetration depth is 5mm. In some embodiments, the base plate includes a first body, a first boss connected with the first body, and a fourth boss connected with the first body, the first boss being located on the second side, the fourth boss being located on the first side, the first boss and the fourth boss both being flush with the first mating surface. In some embodiments, each of the bottom plates is provided with a plurality of studs arranged at intervals, each stud is located on the second side, each stud is provided with a second butt joint surface, the plurality of studs on two adjacent bottom plates are in one-to-one correspondence, when the two adjacent bottom plates are in butt joint, the second butt joint surfaces of the two corresponding studs are in butt joint to form a second joint, each stud is provided with a third side and a fourth side which are oppositely arranged along the thickness direction of the stud, and the third side and the fourth side are used for carrying out double-sided welding on the second joint by adopting laser welding to form a second welding seam, wherein parameters of the laser welding on the second joint are that the laser power is 4.8 KW-5.0 KW, the speed is 3.5 m/min-3.7 m/min, the defocus is +3mm+6mm, and the single-sided penetration depth is 2.7mm. In some embodiments, the stud includes a second body, a second boss, and a third boss, each of the second boss and the third boss being connected to the second body; the second boss is located the third side, the third boss is located the fourth side, the second boss with the third boss with the second butt joint face parallel and level. In some embodiments, the inclination angle of the welding gun of the laser welding is 40-42 ° when welding the second weld joint. In some embodiments, the welding is performed by striking an arc from a root location of the stud while welding the second weld. In some embodiments, the welding method further comprises the steps of performing tack welding on the first joint before welding the first joint and the second joint, performing tack welding on the second joint positioned in the middle of the first joint after the tack welding of the first joint is completed, and performing skip welding tack welding on the second joints positioned on two sides of the second joint in the middle of the first joint along the length direction of the first joint. In some embodiments, the first seam is welded continuously in sections to form a plurality of first sub-seams arranged at intervals, the second seam is welded continuously in symmetrical skip welding mode along the length direction of the first seam on the third side and/or the fourth side to form a plurality of second seams, when the number of the second seams reaches 40% -60% of the number of the second seams, the interval between two adjacent first sub-seams is welded continuously to form a plurality of second sub-seams arranged at intervals, the first sub-seams and the second sub-seams form the first seams, the rest of the second seams are welded continuously in symmetrical skip welding mode along the length direction of the first seams on the third side to form the second seams, and the rest of the second seams