Unequal-thickness heterogeneous dual-phase steel cold metal transition welding technology

A cold metal transition and welding process technology, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve problems such as difficult welding, large heat input, electrode wear, etc., to reduce welding heat input and good mechanical properties , Good effect of welding seam formation

Pending Publication Date: 2019-05-28
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As automobiles become lighter and the thickness of materials becomes thinner, the heat input of traditional MIG / MAG welding is large, and it is easy to weld through the thin plate, resulting in large deformation after welding.
The electrode of resistance spot welding will be gradually worn out during the welding process, so its heat input will not be guaranteed after repeated welding, which will affect the welding result
Laser welding has the disadvantages of high assembly requirements, difficult welding of high reflectivity materials (such as aluminum and copper), and high investment costs.

Method used

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  • Unequal-thickness heterogeneous dual-phase steel cold metal transition welding technology
  • Unequal-thickness heterogeneous dual-phase steel cold metal transition welding technology
  • Unequal-thickness heterogeneous dual-phase steel cold metal transition welding technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this implementation case, the CMT (cold metal transition) welding process parameters are selected as: 1.4mm thick steel plate on top, 1.2mm thick steel plate on bottom, wire feeding speed: 3.0m / min, welding speed: 400mm / min. The welding torch is inclined at an angle of 70° to the steel plate in the direction perpendicular to the welding direction. The welding wire is a low-alloy welding wire with a diameter of 1.2mm, and the dry elongation of the welding wire is 10mm. The protective gas composition is 80%Ar+20%CO 2 A mixture of argon and carbon dioxide was used as the shielding gas.

[0036] The unequal-thickness heterogeneous dual-phase steel plates are used to form lap joints, and the width of the lap joints is 10mm. It is then welded using a CMT (cold metal transfer) welder.

[0037] In this example, the obtained weld is as Figure 4 As shown, the weld seam is uniform, and the welded lap joint is formed smoothly and beautifully; Figure 5 As shown, there is n...

Embodiment 2

[0039]In this implementation case, the CMT (cold metal transition) welding process parameters are selected as: 1.4mm thick steel plate on top, 1.2mm thick steel plate on bottom, wire feeding speed: 3.0m / min, welding speed: 500mm / min. The welding torch is inclined at an angle of 70° to the steel plate in the direction perpendicular to the welding direction. The welding wire is a low-alloy welding wire with a diameter of 1.2mm, and the dry elongation of the welding wire is 10mm. The protective gas composition is 80%Ar+20%CO 2 A mixture of argon and carbon dioxide was used as the shielding gas.

[0040] The unequal-thickness heterogeneous dual-phase steel plates are used to form lap joints, and the width of the lap joints is 10mm. It is then welded using a CMT (cold metal transfer) welder.

[0041] In this example, the obtained weld is as Figure 7 As shown, the weld seam is uniform, and the welded lap joint is formed smoothly and beautifully; Figure 8 As shown, there is no...

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Abstract

The invention discloses an unequal-thickness heterogeneous dual-phase steel cold metal transition welding technology, and relates to a metal welding technology. The technology comprises the followingsteps that the surfaces of to-be-machined plates are processed through acetone under the clean experimental environment, and it is ensured that the surfaces of the to-be-machined plates are free of oil contamination and impurities; the unequal-thickness heterogeneous dual-phase steel plates are placed on a testbed in an overlap joint mode; a welding mode is set through a control panel of a CMT welding machine, after the welding mode is determined, a welding gun is put on an automatic trolley fixture and subjected to position and angle adjusting, and after it is determined that the to-be-weldedparts of the test pieces are consistent with the welding gun in moving direction, welding is conducted; and welding is carried out through a left welding method. According to the unequal-thickness heterogeneous dual-phase steel cold metal transition welding technology, by adopting cold metal transition welding, in the welding process, various welding technology parameters are adjusted, the technology condition is improved, and it is ensured that welded seams are good in form, uniform, smooth and free of macroscopic defects. Especially, through the technology, welding heat input is effectivelydecreased, the cost is reduced, and connectors good in mechanical property can be obtained.

Description

technical field [0001] The invention relates to a metal welding process, in particular to a cold metal transition welding process for heterogeneous dual-phase steels with unequal thickness. Background technique [0002] In recent years, the lightweight of automobile manufacturing has become one of the important means to achieve the purpose of energy saving and emission reduction. High-strength steel has become the dominant automobile lightweight material and has great application prospects. Whether it is in the current car body manufacturing market or in the future for a long time, high-strength steel will be the primary material for car body materials. Therefore, the quality, efficiency and reliability of welded joints of heterogeneous duplex steels with unequal thickness are very important. [0003] As automobiles become lighter and the thickness of materials becomes thinner, the heat input of traditional MIG / MAG welding is large, and it is easy to weld through thin plate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/235B23K9/02
Inventor 刘岩叶海青张露馨姚宇
Owner SHENYANG UNIV
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