Drive motor sealing barrel laser welding manufacturing method

Abstract

The invention discloses a drive motor sealing barrel laser welding manufacturing method. A high power laser beam is subject to single-face welding and double-face molding welding, an annular rigid clamp in special design and a V-shaped groove type on the back face are adopted in the welding process, laser spot welding positioning is firstly carried out according to the sealing barrel special structure after clamping, a high-frequency impulse modulation laser procedure is adopted for welding, a welding seam track is subject to symmetrical welding, machining is carried out after welding to remove surface welding seam sinking parts and welding seam roots, and a control rod drive motor sealing barrel with a certain wall thickness is obtained. According to the drive motor sealing barrel laser welding manufacturing method, effective welding seam fusion depth is larger than 10 mm, the welding seam width is smaller than 1.5 mm, and the good pressure-resistant sealing performance is achieved.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant construction, in particular to a laser welding manufacturing method for a sealing cylinder of a driving motor. Background technique [0002] At present, the domestically developed CRDM driving motor for demonstration fast reactors is a switched reluctance type, which has the advantages of simple structure, higher reliability and flexibility compared with the third-generation driving motor. The key part inside the motor is the sealing cylinder assembly, which is manufactured by alternating welding of a plurality of magnetically conductive rods (ferrite or martensitic stainless steel) and non-magnetically conductive rods (austenitic stainless steel). The magnetic difference from non-magnetic rods realizes the magnetic circuit design of the drive motor, which can flexibly adjust and control the start, operation and shutdown of nuclear reactor fuel rods. [0003] The sealing cylinder of C...

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Problems solved by technology

Due to the large heat input of traditional arc welding, the welding deformation is large, and it is difficult to achieve the large depth-to-width ratio weld seam required by the sealing cylinder

Although the electron beam welding has high power density, small heat input, and can obtain a weld with a large aspect ratio, but because the electron beam is a space current, it will magnetize the magnetically permeable material during welding, and the magnetized magnetically permeable material makes the electrons The beam shifts to it, which makes it difficult to fuse the middle and lower parts of the weld, and cannot guarantee the mechanical properties and sealing performance of the weld

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