Back shielding gas introducing device and method for laser-MIG hybrid welding of high-strength aluminum alloy

A composite welding and shielding gas technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of poor back forming and easy generation of pores, so as to reduce weld porosity, improve back forming and welding efficiency The effect of improving the quality of the weld seam

Pending Publication Date: 2021-05-28
NANJING UNIV OF SCI & TECH
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Problems solved by technology

During laser-MIG hybrid welding of 7A52 high-strength aluminum alloy, there are still problems such as poor formation of the back surface and easy generation of defects such as pores

Method used

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  • Back shielding gas introducing device and method for laser-MIG hybrid welding of high-strength aluminum alloy
  • Back shielding gas introducing device and method for laser-MIG hybrid welding of high-strength aluminum alloy
  • Back shielding gas introducing device and method for laser-MIG hybrid welding of high-strength aluminum alloy

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Embodiment Construction

[0043] In order to make the purpose, scheme and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with schematic diagrams of the device and specific embodiments. The embodiments described below are only used to explain the present invention, and the present invention is not limited to this application way.

[0044] An aluminum alloy laser-MIG composite welding back-pass protective gas device includes a workpiece table 1, a gas-guiding copper pipe 2, a fixing bolt 3, a copper backing plate 4, and a baffle plate 7. The air guide copper pipe 2 is symmetrically placed on both sides of the workpiece table; the copper backing plate 4 is placed in the groove of the workpiece table;

[0045] The workpiece table 1 has a size of 1.6m*1m*0.6m, and its material is 304 stainless steel.

[0046] The front of the workpiece table 1 is a working surface for placing materials to be welded, and the front is provided with a thread...

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Abstract

The invention belongs to the field of metal welding, and relates to a back shielding gas introducing device and method for laser-MIG hybrid welding of a high-strength aluminum alloy. The back shielding gas introducing device comprises a workpiece table, a gas guide copper pipe, fixing bolts, a copper base plate, baffle plates and another gas guide copper pipe, wherein the copper base plate is placed in a groove formed in the working face of the workpiece table; the gas guide copper pipes used for introducing back shielding gas are symmetrically placed on the two sides of the bottom in the groove of the workpiece table and symmetrically arranged in U-shaped holes I in the bottom of the groove; and threaded holes are formed in the two sides of the workpiece table, matched with the fixing bolts and used for fixing the baffle plates to the workpiece table. When the device is used for welding a 7-series high-strength aluminum alloy plate, the problems that hot cracks are prone to occurring, the back face is poor in forming, and air holes are prone to being generated can be solved, and a good butt joint is obtained.

Description

technical field [0001] The invention relates to the field of metal welding, in particular to a back-passing shielding gas device and method for laser-MIG hybrid welding. Background technique [0002] Aluminum alloy has the characteristics of low density, high specific strength, good corrosion resistance and low temperature performance, non-magnetic, good formability, etc., and is widely used in automobiles, aerospace, ships and other fields. As an important category of aluminum alloys, high-strength aluminum alloys are widely used in the aerospace industry, high-speed trains, light vehicles, ships, etc., to meet the ever-growing requirements for lightweight structures. Especially under the trend of energy saving, emission reduction and automobile lightweight, high-strength aluminum alloy welding will be more and more widely used in automobile manufacturing, aerospace and other fields. [0003] Laser-MIG hybrid welding combines the advantages of laser welding and arc welding...

Claims

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Application Information

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IPC IPC(8): B23K28/02B23K26/348B23K26/12B23K26/70
CPCB23K28/02B23K26/348B23K26/12B23K26/702
Inventor 王克鸿许雪宗雷济旭宋正东金鸣李能何思源邵浩彬喻嘉熙时孝东
Owner NANJING UNIV OF SCI & TECH
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