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Laser electrical arc complex welding method for intensifying current magnetohydrodynamics effect

A magnetohydrodynamic, laser arc technology, applied in laser welding equipment, arc welding equipment, welding equipment and other directions, can solve the problems of poor gap adaptability, narrow weld seam, etc., to improve surface forming, weld surface forming improvement, The effect of gap adaptation improvement

Inactive Publication Date: 2008-05-14
BEIJING UNIV OF TECH
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Problems solved by technology

In this case, a set of external power supply is required to provide auxiliary current to the welding area, and at the same time, due to the narrow weld seam after welding, its gap adaptability is poor

Method used

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  • Laser electrical arc complex welding method for intensifying current magnetohydrodynamics effect

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Embodiment Construction

[0016] Referring to accompanying drawing 1 for the technical solution of this embodiment, a laser-arc coordinated arrangement is adopted, and a filler wire 3 is added at the same time. An electric arc 10 is placed behind the laser beam 5, wherein the electric arc 10 can be a TIG arc or a plasma arc.

[0017] The filler wire 3 is fed in from the front of the molten pool 11 , and the welding current flows from the welding wire 3 through the molten pool 11 and the arc 10 to form a current loop. Most of its current flows through the molten pool, generating electromagnetic force in the molten pool.

[0018] During welding, the two poles of the welding power source 1 are respectively connected to the tungsten pole 8 and the welding wire 3, and most of the welding current flows through the welding pool 11 through the welding wire 3, which strengthens the magnetohydrodynamic effect of the arc current. Since the electromagnetic force is proportional to the square of the current densit...

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Abstract

The invention relates to a laser-arc hybrid welding method which reinforces dynamic effect of current and magnetic fluid, belonging to technical field of laser material processing. The invention is characterized in that: a synergistic arrangement of laser and electric arc is adopted and a filler wire is added simultaneously; wherein, the electric arc and the wire are arranged at both sides of a laser beam; the wire is arranged in the front and is contacted with a workpiece, and the electric arc is arranged at the back; the two polarities of the welding power are connected with a tungsten electrode and the wire respectively; the welding power forms a current loop by flowing through a weld pool and the electric arc by the wire, and most of the welding power flows through the weld pool and produces electromagnetic force. The invention has the advantages that the energy coupling efficiency and the stability in the welding process are both highly improved by fully utilizing influence of dynamic effect of arc current and magnetic fluid on the heat exchange situation and the flowing state of the weld pool, and the surface forming state of a weld joint is greatly improved because of the significantly improved tolerance of the electric arc arranging at the back of the weld pool to the wire fluctuation.

Description

technical field [0001] The invention relates to a laser arc hybrid welding method which strengthens the current magnetohydrodynamic effect, and belongs to the technical field of laser material processing. Background technique [0002] Laser welding has outstanding advantages such as high energy density, fast welding speed, small heat input, small welding deformation, and excellent joint performance. It is considered to be the most advanced material joining technology. However, due to the poor bridging performance of pure laser welding, the requirements for workpiece groove preparation and assembly accuracy are extremely high, which largely restricts the industrial application of laser welding technology. At the end of the 1970s, British scholars proposed the concept of laser and TIG (non-melting inert gas shielded welding) arc hybrid heat source welding. At present, laser-arc hybrid welding has become one of the frontiers of laser welding technology research. [0003] Laser...

Claims

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Application Information

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IPC IPC(8): B23K28/02B23K9/00B23K26/20B23K26/348
Inventor 肖荣诗吴世凯杨武雄张松张寰臻陈铠
Owner BEIJING UNIV OF TECH
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