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Ultrasonic coaxial auxiliary laser welding method for plate heat exchanger

A plate heat exchanger and laser-assisted technology, which is applied in the field of material processing, can solve the problems of reducing the utilization rate of ultrasonic vibration, cumbersome design and operation of side shafts, and the reduction of ultrasonic vibration effect, so as to avoid weld porosity defects, enhance joint strength and Corrosion resistance, the effect of improving the performance of welded joints

Active Publication Date: 2016-03-23
CHANGCHUN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the ultrasonic vibration is non-contact, it greatly reduces the utilization rate of ultrasonic vibration, wastes a lot of ultrasonic resources, and the effect of ultrasonic vibration is significantly reduced; in addition, the side-axis design is cumbersome to operate during welding

Method used

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  • Ultrasonic coaxial auxiliary laser welding method for plate heat exchanger
  • Ultrasonic coaxial auxiliary laser welding method for plate heat exchanger
  • Ultrasonic coaxial auxiliary laser welding method for plate heat exchanger

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Such as figure 2 , 3 The schematic diagram of the laser welding auxiliary process equipment is shown. The design of the laser welding auxiliary process equipment is as follows: Since the welded part of the plate has a groove-like structure with a concave up and a convex down, in order to facilitate the clamping and positioning of the plate, strengthen the support at the weld bead, and improve the upper and lower The contact conditions of the plates at the weld bead facilitate the implementation of gas protection on the back of the weld. On the bottom plate of the welding workbench 7, a hole with a height 0.1 mm larger than the welding groove depth of the heat exchanger plate 6 is processed. Boss, and in the center of the boss, mill out a welding reserved groove 10 with a width not less than 3mm, at least 2mm smaller than the bottom of the welding groove, and a groove depth not exceeding 3mm; at the same time, welding protection is provided every 200-300mm The gas chan...

Embodiment 2

[0052] Such as figure 2 , 3 The schematic diagram of the laser welding auxiliary process equipment is shown. The design of the laser welding auxiliary process equipment is as follows: Since the welded part of the plate has a groove-like structure with a concave up and a convex down, in order to facilitate the clamping and positioning of the plate, strengthen the support at the weld bead, and improve the upper and lower The contact conditions of the plates at the weld bead facilitate the implementation of gas protection on the back of the weld. On the bottom plate of the welding workbench 7, a hole with a height 0.1 mm larger than the welding groove depth of the heat exchanger plate 6 is processed. Boss, and in the center of the boss, mill out a welding reserved groove 10 with a width not less than 3mm, at least 2mm smaller than the bottom of the welding groove, and a groove depth not exceeding 3mm; at the same time, welding protection is provided every 200-300mm The gas chan...

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Abstract

The invention discloses an ultrasonic coaxial auxiliary laser welding method for a plate heat exchanger, before a plate sheet of the plate heat exchanger is welded, a self-designed laser welding auxiliary process device is used for clamping the plate sheet of the heat exchanger, in a process of performing the laser welding, high frequency ultrasonic vibration is applied, the ultrasonic vibration and laser beams are applied in a coaxial manner, during laser welding, an ultrasonic vibration tool directly contacts with the plate sheet of the heat exchanger. The laser welding auxiliary process device designed according to the invention can effectively solve the problems of clamping difficulty of plate sheets made from different materials of the heat exchanger and gas protection of a welding connector, meanwhile, an auxiliary action of the ultrasonic vibration can reduce or eliminate a welding residual stress, refine welding seam crystal grains, homogenize a welding seam tissue, and reduce pore and crack defects, thus improving a welding anticorrosion performance and mechanical performances, and prolonging the service life of the plate heat exchanger.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to an ultrasonic coaxial-assisted laser welding method for materials commonly used in plate heat exchangers. The method belongs to the field of material processing, and is a novel and efficient welding method for plate heat exchangers. Background technique [0002] Plate heat exchanger is a highly efficient and compact heat exchanger, which can work normally in high temperature, high pressure and acid-base environment. It is widely used in chemical industry, machinery, metallurgy and other industries, but with the rapid development of modern industry, work Different environments require plate heat exchangers to have more excellent performance, so there are often pressure and temperature limitations and compatibility problems between fluids and gaskets during the use of plate heat exchangers. Laser welding has the advantages of fast speed, small deformation, large aspe...

Claims

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Application Information

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IPC IPC(8): B23K26/346
CPCB23K26/0093
Inventor 石岩陈俊科刘佳张宏刘双宇刘凤德倪聪李云峰
Owner CHANGCHUN UNIV OF SCI & TECH
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