Influence of bottom-threaded pin on hook morphology and mechanical properties of lap welded joint
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摘要: 选用3 mm厚的7075–T6铝合金为研究对象，研究了根部带有螺纹的搅拌针对搅拌摩擦焊搭接接头钩状缺陷及拉剪载荷的影响. 结果表明，搅拌针上的螺纹可明显改变焊接过程中的材料流动；塑性材料在搭接面上部集中，挤压搭接界面，焊后搭接接头的钩状缺陷向下弯曲；搭接面处焊核区的宽度较搅拌针的直径明显增大. 因搅拌针端部无螺纹，焊接速度较大时接头底部会由于材料无法及时填充而产生孔洞缺陷. 随着搅拌头焊接速度的升高，搭接接头的拉剪载荷先上升后下降，最高载荷在焊接速度为40 mm/min时取得，为23.333 kN.Abstract: Using 3 mm thick 7075-T6 aluminum alloys as the research objects, this work studied the effect of a bottom-threaded pin on hook morphology and mechanical properties of friction stir lap welded joint. The results showed that the thread on the pin could significantly affect the material flow behavior during welding. The plastic material accumulated at the lap interface, squeezing the lap interface, So the hook bended downwards after welding. The width of the stir zone was obviously wider than the diameter of the pin. Because there was on thread on the tip of the pin, void easily appears at the bottom of the stir zone due to incomplete refilling of the plastic material. With increasing the welding speed, the lap shear failure load first increased and then decreased. The maximum failure load of 23.333 kN was obtained at a welding speed of 40 mm/min.
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Keywords:
- thread /
- pin /
- friction stir lap welding /
- hook /
- lap shear failure load
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