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The Study of Interface Migrate Behavior in Friction Stir Weld Lap Joint

Author: LuoKai
Tutor: XingLi
School: Nanchang University of Aeronautics and
Course: Materials Processing Engineering
Keywords: Friction Stir Welding Lap joint Migration interface Vertical migration Three -stream metal flow model
CLC: TG453.9
Type: Master's thesis
Year: 2010
Downloads: 147
Quote: 1
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Abstract


LY12 (CZ) aluminum alloy friction stir welded lap welds, by observing the morphology of the weld cross-section analysis, the characteristics of migration in the weld interface, summed up the shape of the mixing head and welding technology the parameter migration interface morphology; weld tensile tests the migration interface morphology tensile properties of the weld; labeled material, as in aluminum foil and plastic weld metal migration behavior, The formation process of the migration interface analysis; Finally, control of migration in the weld interface from the two aspects of the welding parameters and welding process optimization. The study results show that: the friction stir welding lap joints migration interface in real terms as a lack of fusion defects, the forward edge of the migration generates migration interface original lap interface length to be less than the return side; weld migration left threaded mixing head interface migrate upward, the right threaded mixing head welding seam migration interface downward migration, return the edge migration interface vertical migration is greater than the forward edge weld; vertical migration of the interface with the increase in the length of the stirring pin increased with the rotational speed of the decrease and the increase of the welding speed increases. Shear fracture specimen occurrence of brittle fracture, tensile fracture specimen ductile fracture occurred the fracture are brittle fracture of the migration interface in all samples; the migration interface vertical migration greatest impact on the performance of the weld, and the greater the vertical migration, the worse the tensile properties of the weld. The three-dimensional flow friction stir welding weld metal can metal flow model of the \shoulder following friction flow. Friction stir welding lap weld interface migration has the following characteristics: the migration interface migration direction depends on the type of stirring pin surface thread; migration in the mixing head is the same welding conditions, the the interface vertical migration depends on the unit stirring pin within the migrated amount of the metal by the vertical direction; static mixing head in the case of the horizontal distance depends on the biasing force of the shaft shoulder, the migration interface migrate to the weld nugget. Two welding welding using a single mixing head the stirring pin surface unthreaded cylindrical glossy mixing head welding weld in vertical migration interface migration; Use the left and right threaded mixing head hybrid welding process uses migration The migration characteristics of the interface to reduce the tensile force plate of the stress concentration value, thereby increasing the joint fracture can withstand the maximum load; this topic, the offset distance is 4mm, and the vertical sectional view of the welding direction outwardly two welding process The agreed weld fracture load highest 19.0KN.

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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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