A Method for Improving the Quality of Al-cu Dissimilar Metal Friction Stir Welded Butt Joints

A technology of friction stir welding and dissimilar metals, which is applied in the direction of welding/welding/cutting articles, welding equipment, metal processing equipment, etc., and can solve the problem of not significantly improving the welding quality of friction stir welding joints of Al-Cu dissimilar metals, joint machinery There is no obvious improvement in performance, etc., to achieve the effect of improving mechanical properties, simple machining, and simple processing methods

Active Publication Date: 2020-08-14
AEROSPACE ENG EQUIP SUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in order to improve the welding quality of Al-Cu dissimilar metal FSW joints, researchers at home and abroad have carried out a lot of research work, and studied the following process methods, such as: adding barrier layers [Liu H J, Shen J J, Xie S, et al. Weld appearance and microstructural characteristics of friction stir buttbarrier welded joints of aluminum alloy to copper[J]. Science and Technology of Welding and Joining, 2013, 17(2):104-110.], follow-up rolling after welding to improve structure[CN106181020 A], copper side plus external heat source [Zhao Pengcheng et al. Effect of external heat source on aluminum-copper friction stir welding [J]. Journal of Welding Society, 2017, 38(6):69-72.], double-pass friction stir welding [Jin Yuhua et al. Forming and interface structure of Cu-Al joint after double-pass friction stir welding[J]. Journal of Lanzhou University of Technology, 2017, 43(4):28-32.] Stirring head bias[Galvão I , Loureiro A, Verdera D, et al. Influence of Tool Offsetting on the Structure and Morphology of Dissimilar Aluminum to Copper Friction-StirWelds[J]. Metallurgical & Materials Transactions A, 2012, 43(13):5096-5105.] et al. The welding quality of friction stir welded joints of Al-Cu dissimilar metals has not been significantly improved, especially the mechanical properties of the joints have not been significantly improved

Method used

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  • A Method for Improving the Quality of Al-cu Dissimilar Metal Friction Stir Welded Butt Joints
  • A Method for Improving the Quality of Al-cu Dissimilar Metal Friction Stir Welded Butt Joints
  • A Method for Improving the Quality of Al-cu Dissimilar Metal Friction Stir Welded Butt Joints

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Experimental program
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Effect test

Embodiment 1

[0023] 1) Processing of weldments with serrated edges: Take one piece of 6061-T6 aluminum alloy and T2 copper plate with a length of 100 mm, a width of 50 mm, and a thickness of 4 mm, and press the edge of the two plates along the welding butt joint edge on the butt joint surface The trapezoidal sawtooth is processed along the normal line of the weld and distributed in array along the welding length direction. The long side of the trapezoid is 3.00 mm long, the short side is 1.27 mm long, and the height is 1.5 mm. The interval between each sawtooth is 1.5 mm.

[0024] Use sandpaper to remove the oxide skin on the surface of the welding and serrated edges, and then wipe with alcohol to remove the oil stains and other impurities on the weldment.

[0025] 2) Friction stir welding: Firstly, the two weldments processed above are butted together along the sawtooth edge. Misalignment and offset are not allowed in the butt joint of the sawtooth, and the maximum butt gap is less than 0....

Embodiment 2

[0028] 1) Processing of weldments with serrated edges: Take a piece of 7075 aluminum alloy and a brass plate with a length of 100 mm, a width of 50 mm, and a thickness of 5 mm. The trapezoidal sawtooth is machined in the normal direction and arrayed along the welding length direction. The long side of the trapezoid is 3.00 mm, the short side is 1.27 mm, and the height is 1.5 mm. The interval between each sawtooth is 1.5 mm.

[0029] Use sandpaper to remove the oxide skin on the welding surface, and then wipe with alcohol to remove oil and other impurities on the test plate.

[0030] 2) Perform friction stir welding: butt the two processed test plates along the sawtooth edge, the butt joint sawtooth is not allowed to have misalignment and offset, and the maximum butt joint gap does not exceed 0.25 mm. The length direction of the weld seam when viewed from the top of the butt welded parts is as follows: figure 2 The jagged edges shown are visible, and then the butt-connected t...

Embodiment 3

[0033] 1) Processing of weldments with serrated edges: Take industrial pure aluminum and T2 copper pipe fittings with a diameter of 500, a length of 250 mm, and a thickness of 3 mm. The trapezoidal sawtooth is processed in an array distribution along the length direction. The long side of the trapezoidal sawtooth is 3.00 mm, the short side is 1.27 mm, and the height is 1.5 mm.

[0034] Use sandpaper to remove the oxide skin on the welding surface, and then wipe with alcohol to remove oil and other impurities on the test plate.

[0035] 2) Friction stir welding: butt the above-mentioned two pipe fittings along the sawtooth edge, the butt joint serrations are not allowed to have misalignment and offset, and the maximum butt joint gap is less than 0.15 mm. The welded parts after butt joint can be seen along the sawtooth edge of the weld seam on the surface of the pipe fittings when viewed from above, and then the butt welded parts are clamped on the friction stir welding machine ...

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Abstract

The invention discloses a method for improving the quality of an Al-Cu dissimilar metal friction stir welding butt joint. The method specifically comprises the steps that the edges of butt-joint sidesof an aluminum welding part and a copper welding part used for welding are firstly machined into engaged sawtooth sides, then the welding parts on the two sides are in butt joint along the sawtooth sides, and then friction stir welding is carried out. The treatment method is simple, only simple machining is needed, and cost is low; welding seam forming of Al-Cu dissimilar metal friction stir welding can be obviously improved, and the metal mixing degree and the plastic flow behavior of Al-Cu dissimilar metal in the welding process are improved; and meanwhile, the area of an Al-Cu welding interface is increased, the bearing capacity of the joint is increased, the distribution state of a brittle IMC along the interface is changed, and the mechanical performance of the joint is obviously improved.

Description

technical field [0001] The invention belongs to the field of friction stir welding of heterogeneous metals, and in particular relates to a method for improving the quality of friction stir welding butt joints of Al-Cu heterogeneous metals. Background technique [0002] FSW technology is a solid phase welding technology invented by the British Welding Institute (TWI) in 1991. FSW shows great advantages in addition to welding aluminum alloys, magnesium alloys, copper alloys, titanium alloys, etc., and has greater advantages in welding dissimilar metals than other methods. Al-Cu heterogeneous welded joints have broad application prospects in the fields of power electronics and automotive engineering, but there are still great technical problems in Al-Cu welding that have not been resolved, such as poor welding formation and serious sticking of aluminum by the stirring head during welding As a result, the welding process cannot continue, the joint strength is low and there is b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K33/00B23K20/12B23K103/18
CPCB23K20/12B23K33/00
Inventor 郭伟强徐红勇邓建峰吉华李文晓吴廷光王晓涛司福建
Owner AEROSPACE ENG EQUIP SUZHOU CO LTD
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