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Current-assisted laser brazing method or laser fusion brazing method

A brazing method and laser melting technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of low energy utilization rate, uneven interface reaction space, poor wetting and spreading ability, etc., and achieve improved surface forming quality, promotion of wetting and spreading, promotion of homogenization effect

Inactive Publication Date: 2011-01-05
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of poor wettability and spreadability of solder in traditional laser brazing and laser fusion brazing, spatially inhomogeneous interfacial reaction and low energy utilization rate, and provides a current-assisted laser brazing method or laser melting Brazing method

Method used

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  • Current-assisted laser brazing method or laser fusion brazing method

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specific Embodiment approach 1

[0022] Specific implementation mode one: the following combination figure 1 with figure 2 Describe this embodiment, the current-assisted laser brazing method or laser fusion brazing method of this embodiment: during the welding process of the laser brazing method or laser fusion brazing, two base materials are connected to one power output end of the auxiliary current power supply, The other power output end of the auxiliary power supply is connected to the welding wire or the non-melting electrode through the welding controller. electrode.

[0023] The specific steps of the method described in this embodiment are:

[0024] Step 1. Pretreatment of the two base metals to be welded;

[0025] Step 2, fixing the two base materials to be welded on the workbench, and connecting the two base materials to an auxiliary current power supply;

[0026] Step 3, placing the welding wire or the non-melting electrode in front or behind the laser beam along the welding direction;

[0027...

specific Embodiment approach 2

[0042] Specific implementation mode two: the following combination image 3 with Figure 4 Describe this embodiment, the difference between this embodiment and Embodiment 1 is that the welding process parameters in step 4: the laser power is 1.4kW, the shielding gas flow rate is 20L / min, the welding auxiliary current is 100A, and the welding speed is 0.5m / min, the auxiliary current power supply adopts pulse power supply, and the welding auxiliary current pulse time t and pulse interval time t 0 The ratio of t / t 0 is 3, and the others are the same as those in Embodiment 1.

[0043] This embodiment provides a specific example to illustrate the effect of the method of the present invention, image 3 It is the morphology of Ti / Al dissimilar alloy laser fusion brazing joint without auxiliary current. Figure 4 It is the morphology of Ti / Al dissimilar alloy laser fusion brazing joint with auxiliary current. image 3 The process parameters are: laser power P=1800W, welding speed V...

specific Embodiment approach 3

[0044] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the welding process parameters in step 4: the laser power range is 100W-6kW, the shielding gas flow rate is 5L / min-20L / min, and the welding auxiliary current The range is 10A~10kA, the welding speed is 0.5m / min~2m / min, the auxiliary current power supply adopts pulse power supply, and the welding auxiliary current pulse time t and pulse interval time t 0 The ratio of t / t 0 1.5 to 3, and the others are the same as those in Embodiment 1.

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Abstract

The invention relates to a current-assisted laser brazing method or laser fusion brazing method, and belongs to the field of welding. The invention aims to solve the problems of poor moistening and spreading capabilities of brazing materials, and space nonuniformity and low energy utilization efficiency of interface reaction in the traditional laser brazing and laser fusion brazing. In the welding process, two mother metals are connected to one output end of an auxiliary current power supply, the other output end of the auxiliary power supply is connected with a welding wire or a non-fusion electrode through a welding controller, a laser beam is vertically incident to a welding seam, and the welding wire or the non-fusion electrode is added along the front or back side of the welding direction of the laser beam. The method comprises the following steps of: 1. pretreating two mother metals to be welded; 2. fixing the two mother metals to be welded on a worktable, connecting the auxiliary current power supply to the two mother metals; 3. putting the welding wire or the non-fusion electrode at the front or rear side of the welding direction of the laser beam; 4. and starting the laser welding, switching on the auxiliary current power supply, and coordinating and controlling the matching relation between the laser beam and the auxiliary current so as to implement welding.

Description

technical field [0001] The invention relates to a current-assisted laser brazing method or a laser fusion brazing method, which belongs to the field of welding. Background technique [0002] With the rapid development of industries such as automobiles, electronics, and aerospace, laser brazing and laser fusion brazing have been widely used. However, since the laser is a local heating welding method with a large temperature gradient, a series of complex physical and chemical processes such as the wetting and spreading of the liquid solder, the interface reaction and its homogenization will occur during the welding process. The following problems often arise during the process: [0003] First, the wettability and spreadability of the solder during laser melting and brazing is poor, and sometimes it is even necessary to add flux or use flux-cored wire to solve it; [0004] Second, in the laser brazing process, the interfacial reaction between the entire solid / liquid contact i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/20B23K1/005
Inventor 李俐群张新戈陈树海
Owner HARBIN INST OF TECH
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