5A06铝合金厚板双丝PMIG焊接头组织与性能

发布时间：2018-01-18 00:31

本文关键词：5A06铝合金厚板双丝PMIG焊接头组织与性能　出处：《焊接学报》2015年06期 　论文类型：期刊论文

【摘要】：采用双丝PMIG协同式高效焊接方法对板厚为60 mm的5A06铝合金进行了焊接试验,获得了优良的焊接接头,并对焊接接头进行了金相组织和力学性能分析.结果表明,母材保持轧制态纤维状组织,焊缝组织细密均匀,主要为α(Al),β(Mg2Al3)及部分Mg2Si杂质相.接头平均抗拉强度和断后伸长率分别为306.17 MPa和11.93%,达到母材的90.5%和61.5%.对比接头各层显微组织和力学性能发现,热输入影响焊接接头热影响区宽度和力学性能.在焊接热输入最小的正面盖面层,焊缝组织更细,热影响区宽度更窄,试样力学性能更好.
[Abstract]:The welding test of 5A06 aluminum alloy with plate thickness of 60mm was carried out by using double-wire PMIG synergistic high-efficiency welding method, and the excellent welding joint was obtained. The microstructure and mechanical properties of the welded joint were analyzed. The results showed that the base metal kept the fibrous structure in rolling state, and the weld microstructure was fine and uniform, mainly 伪 -Al). 尾 -Mg2Al3) and some Mg2Si impurity phases. The average tensile strength and elongation after break are 306.17 MPa and 11.93% respectively. 90.5% and 61.5 of the base metal are achieved. The microstructure and mechanical properties of each layer of the joint are found. Thermal input affects the width and mechanical properties of the HAZ of welded joints. In the front cover with the smallest heat input, the microstructure of weld is finer, the width of HAZ is narrower, and the mechanical properties of the specimens are better.
【作者单位】：南京理工大学材料科学与工程学院;北京新立机械有限责任公司;
【基金】：国家自然科学基金资助项目(51075214) 基础科研资助项目(A2620132004) 江苏省自然科学基金资助项目(BK20131261)
【分类号】：TG457.14
【正文快照】： 0序言铝合金是最重要的结构材料之一,5A06铝合金由于强度高、比重小、抗腐蚀性能好,在航空航天、交通运输等领域得到了广泛应用.铝及铝合金的线膨胀系数、导热系数约为钢的两倍,凝固时的体积收缩率达6.5%左右,焊接铝合金特别是大厚度、大型构件铝合金时,在脆性温度区间内因应

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