首页|铝合金薄板FSLW界面hook沟成形特征及其对接头力学性能的影响

铝合金薄板FSLW界面hook沟成形特征及其对接头力学性能的影响

Formation Characteristic of hook at the Interface and Its Influence on Mechanical Properties of Friction Stir Welding Aluminum Alloy Sheet Joints

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本文选用1mm厚2A12-T4铝合金薄板进行搅拌摩擦搭接焊实验,通过改变焊接速度,研究其对焊接界面hook沟成形特征及接头力学性能的影响.结果表明,hook沟成形特征受焊接热输入影响较大,当采用95mm/min低焊接速度焊接时,由于焊接热输入大,塑性金属沿焊缝厚度方向上发生剧烈的环形迁移运动,促使hook尾部向上弯曲并堆积大量金属氧化物,有效搭接厚度较小;增加焊接速度至118mm/min时,焊接热输入降低,焊核区塑性金属挤压界面冷金属向上迁移的能力下降,导致hook沟尾部开始向下弯曲;继续提高焊接速度至235mm/min时,hook尾部受到塑性金属向下迁移的力大于向上迁移的力,迫使其向下弯曲,但在尾部产生了机械互锁效应,且焊缝有效搭接厚度明显增大,所获的接头拉剪力最大,高达3.790kN,其平均抗拉线强度为400N/mm,接头呈现明显的韧性断裂;继续增大焊接速度,则不利于提高接头成形质量.
In this paper,2A12-T4 aluminum alloy sheet with a thickness of 1mm were selected for friction stir lap welding(FSLW),and influence of welding speed on hook formation characteristic and mechanical properties of FSLW joints was studied.The results show that,the formation characteristic of the hook is greatly affected by welding heat input.When a low welding speed of 95mm/min is used during FSLW process,as the welding heat input is large,weld plastic metal generates a violent circular migration along the thickness direction,and which causes the end of hook bending upward and a large amount of metal oxides accumulate,resulting in a small effective sheet thickness.When the welding speed is increased to 118mm/min,the welding heat input decreases,and the ability of cold metal to migrate upward decreases at the welding interface,resulting in the hook end beginning to bend downward.Increasing continuously welding speed to 235mm/min,the driving force of migration downward of the hook end is greater than that of the migration upward,causing the hook end bending downward.Moreover,a phenomenon of mechanical interlocking forms at the end,and the effective sheet thickness of the weld significantly increases,which can result in a maximum tensile shearing force of 3.790kN.The average tensile shearing strength is 400N/mm.The fracture mode of the joints presents obvious ductile fracture.It is not conducive to improving the forming quality of the joints with further increasing the welding speed.

aluminum alloy sheetfriction stir lap weldinghookformation characteristicmechanical properties

王金锴、毛育青、戴浩、彭倩群、李智勇、刘泽宇、柯黎明

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南昌航空大学轻合金加工科学与技术国防重点学科实验室,南昌 330063

江西昌河航空工业有限公司,景德镇 333002

铝合金薄板 搅拌摩擦搭接焊 hook沟 成形特征 力学性能

国家自然科学基金江西省主要学科学术和技术带头人培育计划青年人才项目江西省杰出青年基金项目江西省研究生创新专项资金项目

52****452021****230282022****214012YC2***-***9

2023

航天制造技术
首都航天机械公司

航天制造技术

影响因子：0.318
ISSN：
年,卷(期)：2023.(6)
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