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Method for laser butt-welding copper or aluminum and carbon steel

A welding method and technology of carbon steel, applied in laser welding equipment, welding equipment, welding/welding/cutting items, etc., can solve problems such as non-fusion

Inactive Publication Date: 2007-11-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this invention is used to weld thicker copper or aluminum and steel plate, since the thick plate laser welding seam presents an obvious shape of wide top and narrow bottom, in order to ensure that the whole weld seam can penetrate, the laser beam placed on one side of the steel plate should approach When using copper or aluminum, it will inevitably cause over-melting of the upper part of the weld and cause excessive infiltration of copper into the steel, thus forming pores and other problems that are difficult to solve; and when the laser beam placed on the side of the steel plate is far away from copper or aluminum, although The upper part of the weld will not fuse too much, but the lower part of the weld will cause lack of fusion

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  • Method for laser butt-welding copper or aluminum and carbon steel
  • Method for laser butt-welding copper or aluminum and carbon steel

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The dissimilar metal connection method of copper and carbon steel of the present embodiment: as shown in Figure 1, the butt joint form 5 of the inclined end face is adopted, so that the energy of the laser beam 2 can be absorbed by the carbon steel part 1 of low reflectivity at first and make the carbon The steel melts first; when a small hole is formed, the laser contacts with copper or aluminum, and the small hole has a wall focusing effect on the laser in it, and the absorbed energy is transferred to the side of the copper or aluminum plate through the small hole effect, so that the copper plate is melted, Thus a complete dissimilar metal weld 3 is formed.

[0022] The materials of this embodiment are T2 copper and Q235 carbon steel, each with a plate thickness of 5mm. The plate processing is shown in Figure 2: the T2 copper side end surface is processed to 97°, and the Q235 steel side end surface is processed to 83°, that is, α=83° , using CO 2 The laser has an out...

Embodiment 2

[0025] The connection method of this embodiment is the same as that of Embodiment 1.

[0026] The materials of this embodiment are T2 copper and Q235 carbon steel, each with a thickness of 4mm. The plate processing is shown in Figure 2: the T2 copper side end surface is processed to 95°, and the Q235 steel side end surface is processed to 85°, that is, α=85° , using CO 2 The laser has an output power of 6.0Kw, the focus is adjusted to 2mm below the surface of the workpiece, and the welding speed is 1m / min. The two materials are butted, the laser beam is biased on the steel side, the distance from the carbon steel plate side is d=1.0mm from the center line of the butt joint, and the size of the test piece is 100×30×4mm.

[0027] The results of this example show that: the macroscopic view of the weld seam shows no macroscopic defects, there are no defects such as pores and cracks inside the weld seam, and the weld seam is well formed. The tensile strength of the welded joint r...

Embodiment 3

[0029] The connection method of this embodiment is the same as that of Embodiment 1.

[0030] The materials of this embodiment are T2 copper and Q235 carbon steel, each with a thickness of 8mm. The plate processing is shown in Figure 2: the T2 copper side end surface is processed to 100°, and the Q235 steel side end surface is processed to 80°, that is, α=80° , using CO 2 The laser has an output power of 9.5Kw, the focus is adjusted to 4mm below the surface of the workpiece, and the welding speed is 1m / min. The two materials are butted, the laser beam is biased on the steel side, the distance from the carbon steel plate side is d=2.0mm from the center line of the butt joint, and the size of the test piece is 100×30×8mm.

[0031] The results of this example show that: the macroscopic view of the weld seam shows no macroscopic defects, there are no defects such as pores and cracks inside the weld seam, and the weld seam is well formed. The tensile strength of welded joints rea...

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Abstract

The invention is concerned with the laser butt-joint welding method for copper or aluminum in heterogeneity metal joint technology field. It is: designs the joint between the copper or aluminum and the carbon-steel plate to be slanting end face joint mode without slope, adjusts the focus of the laser beam to the bottom of the welding working piece surface, biases the laser beam to one side of the carbon-steel plate with better absorptivity, in order that another side of the copper or aluminum is heated and melted.

Description

technical field [0001] The invention relates to a welding method in the technical field of dissimilar metal connection, in particular to a laser butt welding method of copper or aluminum and carbon steel. Background technique [0002] It is a technical difficulty in the field of welding to realize high-quality and efficient connection between non-ferrous metals such as copper or aluminum and carbon steel. At present, methods such as friction welding, explosive welding, vacuum diffusion welding, vacuum brazing, and arc brazing can be used for copper or aluminum, and electron beam welding methods can also be used. However, friction welding is generally suitable for welding rods, or rods and plates; explosive welding requires a very harsh safety assurance environment, which is not suitable for the production environment of the factory workshop; vacuum diffusion welding, vacuum brazing, and vacuum electron beam welding require vacuum. Low, the structure and size of the workpiec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/24B23K33/00B23K26/02B23K103/18B23K26/26
Inventor 黄坚姚成武蔡艳高志国吴毅雄
Owner SHANGHAI JIAO TONG UNIV
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