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Automatic tracking type laser welding method for micro-slender weld joint of nuclear reactor coolant pump

A coolant pump and laser welding technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve problems such as unqualified welds, deviations between laser beams and weld tracks, etc.

Pending Publication Date: 2021-09-03
HARBIN ELECTRIC POWER EQUIP
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Problems solved by technology

[0007] The purpose of the present invention is to provide a nuclear reactor coolant pump micro-long-range weld automatic tracking laser welding method, to avoid the existence of laser beam and weld track deviation in the process of laser welding micro-long-range welds, resulting in the occurrence of unqualified welds

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  • Automatic tracking type laser welding method for micro-slender weld joint of nuclear reactor coolant pump
  • Automatic tracking type laser welding method for micro-slender weld joint of nuclear reactor coolant pump

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Embodiment approach

[0023] The shielding sleeve is a cylindrical piece spliced ​​by two shielding sleeve plates. For the form of the cylindrical piece, see figure 1 , the shielding sleeve plate contains two fine long-distance welds, the positions of the first weld 1 and the second weld 2 are shown in figure 2 , the specific implementation plan is as follows:

[0024] (1) The continuous laser welding process is adopted. Applicable base metal thickness < 1mm, weld length less than 4000mm, I-shaped groove, assembly gap less than 0.1mm;

[0025] (2) Use the fine seam tracker for real-time automatic tracking, and complete the automatic adjustment of the beam during the welding process of the fine long-distance seam;

[0026] (3) Welding parameters: using the orthogonal method, defocus amount: +5 ~ +8mm; continuous laser output power is set to 400w ~ 700w; welding speed 300 ~ 400mm / min; welding shielding gas adopts argon-helium mixture, the composition 50% Ar+50% He, gas flow 25~35CHF; high-purity ...

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Abstract

The invention relates to an automatic tracking type laser welding method for a micro-slender weld joint of a nuclear reactor coolant pump, which adopts a continuous laser welding process method and is suitable for an I-shaped groove with the thickness of less than 1mm, the weld joint length of less than 4000mmm and the assembly clearance of less than 0.1 mm; and a micro welding seam tracker is adopted for real-time automatic tracking, and automatic light beam adjusting work in the micro long-range welding seam welding process is completed. The continuous laser process with the micro welding seam tracking device is matched with the precise wire feeding and arc suppression control technology to effectively avoid the defects of large heat input amount, large welding deformation, low process size precision and poor stability problems in a traditional tungsten electrode argon arc, and the defects of easy welding deviation, inaccurate wire feeding position, poor arc suppression quality and the like in an existing laser welding method. The design requirements of the coolant pump component of the nuclear main pump reactor are effectively met. The achievement has very high application value in engineering.

Description

Technical field: [0001] The invention relates to an automatic tracking laser welding method for micro-fine long-distance welding seams of nuclear reactor coolant pumps. Background technique: [0002] The nuclear reactor coolant pump is a key component of the cooling system of the nuclear power unit. Its function is to make the coolant form a forced circulation and transfer the heat generated in the reactor to the steam generator. The shielded main pump motor is vertical, water-cooled, and has a squirrel-cage structure. The stator winding and rotor winding are separated from the high-voltage medium by the stator and rotor shielding sleeves. The cavity formed between the stator and the rotor shielding sleeve communicates with the pump chamber and bears the pressure of the reactor coolant system. Therefore, the shielding sleeve has strict sealing performance and performance requirements such as corrosion resistance, heat resistance, and fatigue resistance. [0003] The shieldi...

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Application Information

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IPC IPC(8): B23K26/044B23K26/12B23K26/24B23K26/70
CPCB23K26/24B23K26/044B23K26/12B23K26/702
Inventor 刘大为宋丹杜雷张晨光李雅范王晓文张锁瑶赵志伟黄秀波赵环宇郑维于勇王向春薛林慧
Owner HARBIN ELECTRIC POWER EQUIP
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