High-power laser arc composite welding energy modulation and welding method
A laser arc and welding method technology, applied in the field of material engineering, can solve problems such as the mechanical impact effect of the molten pool, and achieve the effects of reducing the mechanical impact effect, improving weld formation, and reducing welding spatter
Active Publication Date: 2018-11-16
BEIJING UNIV OF TECH
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In addition, in single high-power laser energy modulation welding, the periodic change of power is bound to have a certain mechanical impact on the molten pool
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[0018] The present invention will be further described below in conjunction with the examples, but the present invention is not limited to the following examples.
[0019] IPG YLS 6kW fiber laser (spot diameter 0.33mm, zero defocus) is used for welding. Taking 2m / min speed welding as an example, the welding characteristic time T is calculated according to the spot diameter c About 10ms. The arc current is 100A and the voltage is 15V. For this parameter, use 8:8(t 1 = 8ms output constant laser power 6kW, t 2 = 8ms laser power is zero, alternating frequency is 63Hz) laser energy modulation mode, the energy modulation welding experiment is carried out on the same low carbon steel plate. The results show that the energy modulation method hardly affects the welding penetration (see image 3 ). When welding with 8:8 modulation, the laser input energy is reduced by 50%. By reducing the input laser energy, 40% energy is reduced in the total energy of hybrid welding under this pr...
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The invention discloses a high-power laser arc composite welding energy modulation and welding method, and belongs to the field of material machining. The method is characterized in that an electric arc current in composite welding is constant, during a time period t1 of a laser output constant power, the electric arc and the laser generate a synergistic effect, and plume is removed; a small holeexists in the electric arc in the laser output modulation power time t2, and the laser modulation power is between zero and P (the P is a constant power in t1 and is larger than 3 kW). The selection of the t1 and the t2 is related to the formation time of the small hole, and the alternating frequency ranges from 10 Hz to 500 Hz. According to a composite mode, the laser is coaxial or paraxial withthe electric arc; the electric arc is a non-consumable electrode inert gas shielded arc, a consumable electrode gas shielded arc or a plasma arc; and a laser beam is a Nd:YAG laser, an optical fiber laser or a disc type laser. According to the method, energy input can be greatly reduced, the welding process is more stable, the welding seam is better formed, and the welding penetration depth is hardly influenced; and due to the fact that the manufacturing energy consumption is greatly reduced, the welding manufacturing process is more environment-friendly.
Description
technical field [0001] The invention belongs to the technical field of material engineering and relates to a material processing method, in particular to a compound heat source energy modulation material processing method. Background technique [0002] In recent years, thanks to the breakthrough of industrial laser technology, especially the breakthrough of fiber laser technology, its maximum stable output power has reached 100kW. The hybrid welding of arc and such high-power laser, on the one hand, through the interaction of laser and arc to produce 1+1>2 synergistic enhancement characteristics, can obtain greater welding penetration or higher welding efficiency. On the other hand, the introduction of arc can overcome the shortcomings of small spot in welding, thereby improving bridging and reducing assembly precision requirements. In addition, the plume produced in this type of high-power laser welding has a serious negative impact on the welding process. The introduct...
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IPC IPC(8): B23K26/348
CPCB23K26/348
Inventor 邹江林王利达肖荣诗徐洁洁
Owner BEIJING UNIV OF TECH