Abstract

Friction stir lap welding (FSLW) experiment has been conducted on 3mm thick AZ80 extruded sheet and 2.3mm thick AZ31B rolled sheet. The influence of the shape of the taper thread mixing head on microstructure has been discussed. Pores forming, hooked defects, interface migration, tissue distribution have been analyzed. The organization of both sides of nugget zone (NZ) is arranged diagonally above, due to the corresponding resultant force along the thread of pin. NZ was collided to form a cascade "onion ring" by plastic microstructure rotating with thread of the pin and dropping from concave of mixing head conical body. Cavity defect was concerned with the poor deformation of AZ80 magnesium alloy placed underneath and relevant organization collision.

Highlights

  • There are many lap joints in aerospace, shipbuilding and light-rail structures

  • Naik et al [4] showed that Friction stir lap welding (FSLW) parameters affect hook size of AZ31B magnesium alloy joint where the joint has been fractured

  • Xing [6, 7] demonstrated that the height of interface migration increased with the increase of plunge depth of shoulder and interface migration of the retreating side was higher than the advancing side in FSLW joint of aluminum alloy

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Summary

Introduction

There are many lap joints in aerospace, shipbuilding and light-rail structures. Due to lightweight, low energy consumption, green remanufacturing requirements of various industries, magnesium alloys are often chosen for lap joints [1]. Friction stir lap welding (FSLW), a solid-state bonding, can be used as an alternative approach [2]. Naik et al [4] showed that FSLW parameters affect hook size of AZ31B magnesium alloy joint where the joint has been fractured. Jana et al [5] studied the influence of mixing head shape on the performance of magnesium alloy and steel lap joint. Wang et al [8] discussed the influence of the length of the needle on hook type size and joint performance. Al-badour et al [9] established a finite element model to simulate dissimilar alloy FSLW of different mixing needle. Jagadeesha [10] friction stir butt welded dissimilar aluminum and magnesium alloys at low speed.

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