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Friction stir welding of thick mixing head shape of the welding performance impact

Author: DengHang
Tutor: HeDiQiu
School: Central South University
Course: Mechanical Manufacturing and Automation Engineering
Keywords: FSW 2219 aluminum alloy Mixing head FLUENT
CLC: TG453.9
Type: Master's thesis
Year: 2007
Downloads: 84
Quote: 0
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Abstract


Friction stir welding in welding 20mm thick aluminum alloy mixing head shape for low sensitivity , it was easier to obtain dense joints with excellent performance , but the application of friction stir welding of aluminum alloys for more than 25mm thickness defects are formed at the bottom easily . In this paper, friction stir welding on thick plate welding in this issue , in order to target the welding high strength aluminum alloy 2219 , 2219 aluminum alloy with high strength , low temperature and high temperature mechanical properties, high fracture toughness , excellent resistance to stress corrosion , etc. features, is the manufacture of large aerospace tank carrying the ideal materials. Taking into account the core technology of friction stir welding . Mixing head on the properties of welded joints role in the normal thickness of square tapered mixing head study based on the proposed reversing a certain angle to get square tapered spiral mixing head . In this paper, computational fluid dynamics theory and its business analytics software FLUENT, established a thick FSW flow field and temperature field model , analyzing different twist angles mixing head and the bottom of the flow field defects inhibition. We applied square tapered spiral mixing head to 30mm thick 2219 aluminum alloy welding , no significant bottom of the weld defects by mechanical properties, fracture analysis , hardness distribution and metallographic analysis of such organization , You can find excellent performance of welded joints . Through numerical simulation analysis, shows that spiral square tapered mixing head compared to conventional mixing head will form a strong downward velocity component , there is insufficient material on the bottom of the well to complement , inhibiting the generation of defects . Through experimental verification of the improved mixing head above the weld 25mm thickness aluminum has a distinct advantage . This paper analyzes the plate while welding process in the second phase θ of the change, and θ the relative strength of the weld .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding process > Pressure welding > Other pressure welding
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