Friction stir butt welding device used for titanium-nickel dissimilar materials and machining method thereof
A technology of friction stir welding and friction stir, applied in metal processing equipment, welding/welding/cutting items, manufacturing tools, etc., can solve thermal stability, creep resistance notch sensitivity reduction, difficulty in increasing welding speed, plasticity , Fracture toughness reduction and other issues, to achieve the effect of improving protection, reducing welding defects, and reducing axial downward pressure
Pending Publication Date: 2020-07-17
TONGLING UNIV
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Problems solved by technology
At the beginning of friction stir welding, the weld is in a low temperature state, and the stirring head will be severely worn or even broken
[0004] 2) It is difficult to increase the welding speed
This makes it very limited when welding high melting point and high hardness metals
[0005] 3) High welding load
Oxygen and nitrogen can form interstitial solid solutions in titanium, which seriously distorts the crystal lattice of titanium, increases its strength and hardness, reduces its plasticity and fracture toughness, and reduces its thermal stability, creep resistance, and notch sensitivity.
Method used
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Embodiment 1
[0039] Such as figure 1 As shown, a friction stir butt welding device for dissimilar materials of titanium and nickel includes a workbench, a friction stir welding mechanism and a laser heating mechanism. The workbench is used to place and fix the workpiece to be welded. The surface of the workbench is set There is a heat shield 1. By setting the heat shield 1, the temperature gradient in the thickness direction of the weld can be reduced, so that the bottom of the welded workpiece also has a sufficient softening effect, thereby increasing the flow and flow of the material in the bottom area of the workpiece during the welding process. The bottom of the workpiece can also be fully mixed, reducing welding defects and improving weld quality.
[0040] The friction stir welding mechanism includes friction stir welding equipment, and the output end of the friction stir welding equipment includes a stirring head 6 and a gas protection mechanism, and the stirring head 6 is used for...
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Abstract
The invention relates to a friction stir butt welding device used for titanium-nickel dissimilar materials and a machining method thereof. The friction stir butt welding device comprises a workbench and a friction stir welding mechanism, wherein the friction stir welding mechanism comprises friction stir welding equipment, the friction stir butt welding device further comprises a laser heating mechanism, the output end of the friction stir welding equipment comprises a stirring head and a gas protection mechanism, and the gas protection mechanism comprises a protective gas hood. According to the friction stir butt welding device used for the titanium-nickel dissimilar materials and the machining method thereof, two laser heat sources are introduced on the basis of conventional friction stir butt welding, so that the hardness of titanium and nickel is reduced, the hardness of the titanium and nickel is equivalent after the titanium and nickel are softened, the dissimilar materials to bewelded are softened synchronously, and the problems of downward pressure of a stirring head shaft, radial stress of a stirring needle and uneven stress in the welding process can be greatly reduced.
Description
technical field [0001] The invention belongs to the technical field of friction stir welding equipment, and in particular relates to a friction stir butt welding device for dissimilar materials of titanium and nickel and a processing method thereof. Background technique [0002] Friction stir welding is widely used in the welding of low melting point and high performance metal materials such as aluminum alloy and magnesium gold. Seam quality is reduced, welding deformation is reduced, and welding materials are saved. With the development and promotion of friction stir welding technology, more and more attention has been paid to the friction stir welding technology of iron-based alloys, titanium alloys, nickel-based alloys and other high melting point metals, but the shortcomings of traditional friction stir welding technology are gradually exposed . Its main disadvantages are as follows: [0003] 1) Abrasion of the mixing head. At the beginning of friction stir welding, ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B23K20/12B23K20/14B23K20/24B23K20/26B23K103/18
CPCB23K20/122B23K20/14B23K20/24B23K20/26B23K2103/18
Inventor 王东生徐礼锋刘玥杨浩朱元洋肖睿张一驰
Owner TONGLING UNIV