Hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser

A tungsten argon arc and hybrid welding technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of high welding cost, slump, poor stability, etc., and achieve the goal of reducing reflectivity and improving absorption rate Effect

Inactive Publication Date: 2011-08-24
CRRC QINGDAO SIFANG CO LTD
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Problems solved by technology

However, when using laser beams to weld aluminum alloys, due to the high reflectivity of aluminum to lasers and fast heat conduction, it is often necessary to use relatively high-power l...

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  • Hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser
  • Hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser

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Embodiment Construction

[0028] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0029] As shown in Figure 2, the composite welding method of the present invention adopts the polarity-variable square-wave argon tungsten arc and the laser composite heat source to carry out butt welding of metal plates or profiles such as aluminum alloys, and the metal plates or profiles can be aluminum alloys, One or two materials in magnesium alloy, copper alloy, titanium alloy and low-alloy steel. This embodiment takes the butt welding of two aluminum alloy plates as an example to describe in detail, wherein the thickness of the aluminum alloy plate is 8mm. The width is 200mm and the length is 1000mm.

[0030] The variable polarity square wave tungsten electrode is Φ2.4mm WC20, the distance between the top of the electrode and the workpiece surface is 3mm, the diameter of the nozzle is 6.0mm, and the stem extension of the tungsten electrode i...

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Abstract

The invention relates to a hybrid welding method of variable-polarity square-wave tungsten electrode argon arc and laser, comprising the following steps: firstly fixing a variable-polarity square-wave tungsten electrode argon arc welding gun and a laser beam transmitting gun, providing a workpiece moving at a constant speed, forming a mode of preposing the variable-polarity square-wave tungsten electrode argon arc welding gun, utilizing the electric arc of variable-polarity square-wave tungsten electrode argon arc welding to remove impurities such as oxide films and the like at the surface zone of the welding workpiece, and leading the workpiece to be in a high-temperature melting state; and then leading laser beams to radiate a welded part, thus deepening the depth of fusion in variable-polarity square-wave tungsten electrode argon arc welding and finishing the welding. By utilizing the welding method adopted by the invention, the reflectivity of metal to the laser can be reduced, and the absorptivity of the metal to the laser energy is improved, so that the effective heating depth of the laser is improved, the depth of fusion of welding seams is enlarged, and the width of the welding seams and the width of heat affected zones are effectively reduced, thus finally a welding piece with deeper depth of fusion, very small heat affected zones and attractive appearance can be obtained.

Description

technical field [0001] The invention relates to a method for butt welding of metal plates or profiles such as aluminum alloys, specifically a method for butt welding of metal plates or profiles such as aluminum alloys by using two heat sources of variable polarity square wave tungsten argon arc and laser at the same time A welding method belongs to the technical field of metal welding. Background technique [0002] Aluminum alloy has many advantages such as low density, good plasticity, easy processing and forming, no low-temperature brittle transition and atmospheric corrosion resistance. It is widely used in aviation, aerospace, high-speed rail trains or other vehicles. Its physical and chemical properties determine its unique weldability. [0003] The TIG welding of aluminum alloy requires not only to play the role of cathode cleaning to remove the dense oxide film on the surface, but also to reduce the burning loss of the tungsten electrode and maintain the shape of the...

Claims

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Application Information

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IPC IPC(8): B23K28/02B23K26/348
Inventor 罗斌杨尚磊吕任远林君山孟立春丁叁叁陈文宾林庆琳
Owner CRRC QINGDAO SIFANG CO LTD
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