铝合金厚板FSW焊缝成形及金属流动行为分析

发布时间：2019-01-20 17:43

【摘要】：采用三角平面圆锥形搅拌针焊接20mm厚的铝板,分析工艺参数对焊缝成形及金属流动特征影响。随着旋转速度增加,单位时间内金属迁移量增大,焊核区面积增加,疏松区面积减小至消失;而过大的旋转速度反而使疏松缺陷再次出现。适当减小焊接速度,增大单位长度内焊缝热输入,改善焊缝成形,但焊接速度过小易导致焊缝上部受热过多,疏松区及内部孔洞变大。在合适的参数下焊接时,瞬时空腔的出现可使更多塑化金属绕搅拌针做圆周迁移,即提高了沿水平方向的"抽吸-挤压"效应,改善了金属流动性,减少甚至消除焊缝内部缺陷。
[Abstract]:20mm thick aluminum plate was welded with triangular plane conical agitated needle. The influence of process parameters on weld forming and metal flow characteristics was analyzed. With the increase of rotation speed, the metal mobility increases in unit time, the area of weld nugget increases, the area of loose zone decreases to disappear, and the loose defect appears again when the rotation speed is too large. The welding speed is reduced properly, the heat input of weld is increased in unit length, and the weld formation is improved. However, too little welding speed will lead to excessive heating of the upper part of the weld, and the loose area and the inner hole will become larger. When welding with suitable parameters, the appearance of instantaneous cavity can make more plasticized metal move around the stirring needle, that is, the "suction-extrusion" effect along the horizontal direction is increased, and the metal fluidity is improved. Reduce or even eliminate internal defects of weld.
【作者单位】：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;西北工业大学凝固技术国家重点实验室;
【基金】：国家自然科学基金(51265043,51265042) 江西省高等学校科技落地计划(KJLD13055,KJLD12074)~~
【分类号】：TG453.9

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