Method and device for welding tube type heat exchanger by using laser scanning

A tube-and-tube heat exchanger, laser scanning technology, applied in the direction of laser welding equipment, welding equipment, tubular objects, etc., can solve the problems of incompatibility, huge equipment, high cost, etc., and achieve wide application value, heat exchange area and heat conduction The effect of improving efficiency

Inactive Publication Date: 2009-12-02
SHANGHAI INST OF LASER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In traditional laser welding, the beam is usually fixed, the workpiece is displaced along the weld track on the working platform, the laser beam is focused on the surface of the workpiece for weldin

Method used

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  • Method and device for welding tube type heat exchanger by using laser scanning
  • Method and device for welding tube type heat exchanger by using laser scanning
  • Method and device for welding tube type heat exchanger by using laser scanning

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The high-power laser uses a kilowatt-level carbon dioxide laser with a laser wavelength of 10.6 μm. An industrial-grade carbon dioxide laser with better beam quality can be used, such as Rofin DC350 high-power carbon dioxide laser. The beam expander lens and focus lens used in the dynamic focusing optical system are all processed with high-quality zinc selenide materials. The optical components of the beam expander lens and focus lens must be sputtered to obtain a high-quality carbon dioxide laser 10.6μm wavelength anti-reflection coating to Ensure that the system has certain damage resistance and service life under high-power laser working conditions.

[0025] Set the outer diameter of the stainless steel tubes used in the tube-and-tube heat exchanger, the diameter of the array of round holes on the upper and lower positioning plates, the hole spacing, and the diameter and wall thickness of the tubes, and make computer-controlled processing files:

[0026] According to...

Embodiment 2

[0029]The high-power laser uses a high-power fiber laser. The high-power fiber laser has small size, excellent beam quality, and is maintenance-free. The laser wavelength is 1.06 μm. Industrial-grade high-power fiber lasers produced by IPG or SPI can be selected. The laser power range is 200w- 1000w, due to the good quality of the fiber laser beam, a very fine focused spot can be obtained, the weld seam is more uniform and smooth, and the laser energy is optimized by controlling the beam pulse width modulation. The beam expander lens and focus lens used in the dynamic focusing optical system are all made of high-quality quartz or sapphire materials. The optical components of the beam expander lens and focus lens must be sputtered to obtain a high-quality fiber laser 1.06μm wavelength anti-reflection coating to ensure The system has certain damage resistance and service life under high-power laser working conditions. High-power fiber laser dynamic focus scanning welding is more...

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Abstract

The invention discloses a method and a device for welding a tube type heat exchanger by using laser scanning. Under the control of a computer program and according to tube parameters of the tube type heat exchanger, data such as laser parameters, dynamic focusing scanning control parameters, and the like is determined, and the heat exchanger components are welded and processed by adopting a laser beam deflection scanning method. The device for realizing the method comprises a high power laser, a collimated beam expander, a diaphragm with water cooling, a dynamic focusing system, an XY beam positioning scanner, a CCD photographing system, a Z-axis liftable workbench and a computer control system. The invention has the advantages that after the welded workpiece is fixed, only the focused laser beam is arranged in a determined three-dimensional processing space under the control of the computer program, and the tube type heat exchanger is subjected to non-contact type welding along a welding seam locus in a dynamic focusing laser beam scanning welding method. The invention overcomes the difficulty in the manufacturing of the tube type heat exchanger and realizes the precision manufacturing of a stainless steel ultrathin-wall tube type miniature heat exchanger.

Description

technical field [0001] The invention relates to a method and device for laser scanning welding of a tubular heat exchanger, belonging to the technical field of laser processing. Background technique: [0002] Heat exchangers are also called heat exchangers, and heat exchangers can be divided into tube type, plate type and other types according to the shape and structure of their heat transfer surfaces. With the development of modern society, the demand for energy is increasing. Thermal energy is one of the main forms of energy expression. While petrochemical resources have caused great pollution to the living environment of human beings, they are also accelerating the depletion of non-renewable resources. About 80% of thermal energy utilization is converted into different uses through heat exchangers. If the heat transfer efficiency of the heat exchanger can be improved, the energy utilization rate will be greatly improved. Tube-and-tube heat exchanger is a traditional sta...

Claims

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Application Information

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IPC IPC(8): B23K26/20B23K26/02B23K26/12B23K26/04B23K101/04B23K26/21
Inventor 王又良沈可余张伟王健超姜兆华潘涌沈冠群
Owner SHANGHAI INST OF LASER TECH
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