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Laser energy modulation welding method

A welding method and laser energy technology, applied in laser welding equipment, welding equipment, manufacturing tools, etc., can solve the problems of unstable penetration welding process, excessive energy input, and reduced welding speed, so as to reduce the deformation of welded parts , The welding seam is formed obviously, and the effect of reducing energy

Active Publication Date: 2018-09-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high power of the laser introduces a new problem: even for stainless steel with excellent welding performance, the penetration welding process is extremely unstable
On the one hand, in order to obtain a greater penetration depth, it is necessary to increase the power of the laser and reduce the welding speed; on the other hand, after increasing the laser power and reducing the welding speed, there is a problem of overheating of the molten pool caused by excessive energy input

Method used

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Effect test

Embodiment 1

[0019] IPG YLS 6kW fiber laser (spot diameter 0.33mm, zero defocus) is used for welding at varying speeds. See figure 2 At low speed, the inflection point time from the fast forming process to the slow forming process of the small hole is about 6ms (this time is related to the laser parameters and the physical properties of the material, and it can be roughly estimated to be half of the welding characteristic time at low speed), the plate moves to the right, and the initial welding The penetration formation process at the location is very rapid.

[0020] Taking 2m / min speed welding as an example, the welding characteristic time T c About 10ms. It can be seen that the small hole has been basically formed in the first 6ms of the welding characteristic time, and the laser output energy in the last 4ms has little effect on the penetration depth. For this parameter, 6:4 (laser energy is output in the first 6ms, the laser power is zero in the next 4ms, and the alternating frequenc...

Embodiment 2

[0023] A laser energy modulation welding method, comprising the following steps:

[0024] 1) The laser beam is applied to the plate to be welded, and the welding pool is protected by inert gas;

[0025] 2) The modulation waveform of laser output power adopts "\" type, see image 3 (b) shown. that is t 1 The laser power in the time period is constant as P, and t 2 The power of the laser in the time period starts from P and decreases linearly to 0W;

Embodiment 3

[0027] A laser energy modulation welding method, comprising the following steps:

[0028] 1) The laser beam is applied to the plate to be welded, and the welding pool is protected by inert gas;

[0029] 2) The modulation waveform of laser output power adopts "V" type, see image 3 (c) shown. that is t 1 The laser power in the time period is constant as P, and t 2 The change waveform of laser power in time period adopts "V" shape;

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Abstract

The invention relates to a laser energy modulation welding method and belongs to the technical field of laser material processing. The laser energy modulation welding method is characterized in that during welding, power modulation output welding is performed through laser energy according to certain modulation frequency and the laser welding characteristic time (the spot diameter is divided by welding speed). The specific characteristics include that the laser output constant power time t1 and the laser output modulation power time t2 occur alternately, and the alternate frequency is 10 Hz-500 Hz; and within the t2 time period, the laser power ranges from zero W to P (P is the constant power within the t1). Selection of the t1 and the t2 is related to the welding characteristic time. Thewelding method has the advantages that laser energy input can be reduced substantially, the acute evaporation process of a molten bath is weakened, deformation of a welded part is reduced obviously, and the welding penetration is nearly not affected; and the manufacturing energy consumption is reduced substantially, and thus the welding manufacturing process is more environment-friendly.

Description

technical field [0001] The invention relates to a welding method, which belongs to the technical field of laser material processing, in particular to a laser energy modulation welding method. Background technique [0002] Compared with traditional welding technology, laser welding has significant advantages such as high energy density, fast welding speed, large weld depth-to-width ratio, and good joint performance. It is considered to be one of the most dynamic joining technologies in the welding field. It is widely used in nuclear power, marine, national defense and other fields. In recent years, with the rapid development of these fields, higher requirements have been put forward for welding thickness and quality. For example, the thickness of some parts to be welded in nuclear reactors exceeds 100mm, and laser welding technology has faced new challenges. At present, feasible methods include arc narrow-gap multi-layer filling welding, laser narrow-gap multi-layer filling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/12
CPCB23K26/123B23K26/21
Inventor 邹江林郭士慧肖荣诗杨武雄王利达
Owner BEIJING UNIV OF TECH