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Laser welding method

A laser welding and laser technology, applied in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problem of reducing the strength of the welding part, achieve a good welding state, and inhibit the effect of air bubbles

Active Publication Date: 2016-10-12
PANASONIC INTPROP MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the laser beam is irradiated to a wide area of ​​the workpiece, bubbles will be generated inside the molten pool, and the strength of the welded part will be significantly reduced.

Method used

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Examples

Experimental program
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Embodiment approach

[0029] use Figure 1 to Figure 14 This embodiment will be described.

[0030] First, use figure 1 and figure 2 The laser welding system for carrying out the laser welding method of this embodiment is demonstrated. It should be noted, figure 1 It is the laser welding system 10 using the galvano scanner (Galvano Scanner) 2 of this embodiment. figure 2 It is the laser welding system 20 using the robot 8 of this embodiment.

[0031] exist figure 1 Among them, the laser welding system 10 has a laser oscillator 1 , a galvanometer scanner 2 and a scanner control device 5 . The laser oscillator 1 generates laser light 23 . The vibrating mirror scanner 2 has two vibrating mirrors 3 , two vibrating mirror motors 4 , and an Fθ lens 6 . The vibrating mirror 3 two-dimensionally changes the trajectory of the laser beam 23 . The two vibrating mirror motors 4 rotate the respectively connected vibrating mirrors 3 . In addition, the two vibrating mirror motors 4 are controlled by a ...

Embodiment 1

[0056] Below, with respect to comparative example 1 and comparative example 2, utilize Figures 9 to 11 Example 1 for carrying out the present invention will be described. Figure 9 The results of laser welding in this example are shown, (a) is a plan view of the upper surface, and (b) is a plan view of the lower surface. Figure 10 It is a sectional view showing the principle of laser welding in this embodiment. Figure 11 The state of the laser welding of this Example is shown, (a) is a top view, (b) is a cross-sectional view. It should be noted that sometimes for Figure 3-5 The same structures are assigned the same reference numerals, and descriptions thereof are omitted.

[0057] Figure 9 Shows the welding state (processing result) of the upper surface and the lower surface of the workpiece when the laser welding of the spiral orbit is performed on the overlapped workpiece under the third welding condition, (a) is a plan view of the upper surface, (b) ) is the plan ...

Embodiment 2

[0071] Below, use Figure 12 Example 2 for carrying out the present invention will be described. Figure 12 It is a plan view showing the state of laser welding in this embodiment. It should be noted that, for Figure 11 The same reference numerals are used for the same structures in (a), and description thereof will be omitted.

[0072] As for the spiral track 51 of the laser beam 23 , if the adjacent tracks 51 are at equal intervals, the temperature is higher at a portion closer to the center of the melting pool 22 . Therefore, the molten pool 22 tends to be enlarged, and the laser beam 23 is easily irradiated to the molten pool 22 . In order to avoid this situation, the laser welding method of the present embodiment such as Figure 13 As shown, when welding is performed by irradiating the laser beam 23 spirally from the inner side toward the outer side, the irradiation start position at which the laser beam 23 is irradiated spirally is set as the second starting point 5...

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Abstract

This laser welding method has a first step and a second step. In the first step, a first workpiece and a second workpiece are overlaid in a first work area. In the second step, the first workpiece and the second workpiece are irradiated with a laser light in the first work area while the laser light is moved in a spiral path. Also in the second step, the first workpiece and the second workpiece are melted by irradiation of the laser light to form a liquid-phase portion. Also in the second step, the laser light is moved so as not to irradiate the liquid-phase portion a second time.

Description

technical field [0001] The present invention relates to a laser welding method for irradiating a laser beam in a spiral shape to a processed object of a lap joint. Background technique [0002] In the laser welding method of lap welding workpieces by laser irradiation, in order to increase the gap margin between the workpieces, the method of filling the gap by widening the molten pool by irradiating the laser beam to a wide range of the workpieces is often used. Laser welding method. However, when the laser beam is irradiated over a wide area of ​​the workpiece, air bubbles are generated inside the molten pool, and the strength of the welded portion is remarkably lowered. Therefore, many methods of removing air bubbles generated inside the molten pool have been proposed. [0003] Patent Document 1 describes a method of removing air bubbles by irradiating laser light to the molten pool to stir the molten pool. In addition, Patent Document 2 describes a method of eliminatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/28B23K26/244
CPCB23K26/0876B23K26/22B23K26/244B23K26/0626B23K26/082
Inventor 中川龙幸向井康士川本笃宽藤原润司松冈范幸
Owner PANASONIC INTPROP MANAGEMENT CO LTD
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