Repair welding method for self-locking friction plug
A self-locking, repair welding technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of inability to integrate and high equipment cost, and achieve the effect of less defects, good performance and small deformation
Active Publication Date: 2019-03-19
CAPITAL AEROSPACE MACHINERY +1
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Problems solved by technology
The friction plug repair welding process has high requirements on equipment, requiring an axial forging pressure of 100KN, a maximum spindle speed of 8000rpm, and an emergency stop time of the equipment within 1s, which is much higher than the current level of domestic friction stir welding machines. Repair welding equipment cannot be integrated in the existing storage tank production line, and the equipment cost is also high
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Embodiment Construction
[0032] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0033] The present invention provides a method for repairing point defects in the welding seam of a carrier rocket tank, comprising a plug rod 1 and a plug hole 2, wherein the plug hole 2 and the plug rod 1 are both conical structures and have threads processed on the surface, and the plug rod 1 and The products to be repaired are made of the same material, the size of the plug hole 2 and the plug rod 1 are different, and the length of the threaded area of the plug rod 1 is greater than the height of the plug hole 2; before repairing welding, pre-drill holes at the welding defect and process the plug hole 2 according to the requirements. 2. Select the appropriate plug rod 1 for the size. When repairing welding, first align the plug rod 1 with the plug hole 2 and insert the plug rod 1 into the plug hole 2. The high speed rotation of the plug ro...
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Abstract
The invention belongs to the technical field of repair welding of friction plugs and particularly relates to a repair welding method for a self-locking friction plug. The repair welding method comprises the following steps that internal inclusions and a bottom unfused defect are excluded, and a suitable plug hole is formed in the defect part; a workpiece with the plug hole is fixed to a tool, a welding machine is operated to adjust the position of a plug rod, and the axial central line of the plug hole coincides with the axial center of the plug rod; the welding machine is operated to clamp the plug rod to descend slowly and make contact with the surface of an inner thread of the plug hole; the workpiece with the plug hole is static, the plug rod rotates at a high speed, and the surface ofan outer thread of the plug rod and the surface of the inner thread of the plug hole makes contact and conduct friction to generate heat; the plug rod rotates stably and then moves downwards in the axial direction till the lower end face of the plug rod is flush with the lower end face of the plug hole, the plug rod is kept rotating at the high speed, and the plug hole makes contact with the thread of the plug rod completely; upsetting force is applied downwards in the axial direction of the plug rod, and pressure maintaining is conducted; and shutdown is conducted, and the redundant part, protruding out of the plug hole, of the plug rod is eliminated. According to the repair welding method, the welding efficiency and quality of a storage box can be improved.
Description
technical field [0001] The invention belongs to the technical field of friction plug repair welding, in particular to a self-locking friction plug repair welding method. Background technique [0002] The new dual-shoulder friction stir welding technology adopts the upper and lower shoulders to weld, of which the lower shoulder can play the role of a support pad, which solves the complex problem of the back tooling of conventional friction stir welding, and also fundamentally solves the root problem. Therefore, it has broad application prospects in the circumferential seam welding of the new generation of large launch vehicle tanks. However, due to the technical characteristics of double-shoulder friction stir welding, there are key holes at the tail of the circumferential seam welding. In order to realize the engineering application of double-shoulder friction stir welding in the tank girth, it is necessary to carry out high-quality repair of the keyhole after welding. In ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B23K20/12B23K20/24
CPCB23K20/127B23K20/24
Inventor 杨君高彦军田志杰熊林玉孙世烜李超计鹏飞董康英马小玉
Owner CAPITAL AEROSPACE MACHINERY