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.
CN113333941APending Publication Date: 2021-09-03HARBIN ELECTRIC POWER EQUIP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HARBIN ELECTRIC POWER EQUIP
Publication Date
2021-09-03

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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.
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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...

Claims

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