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2060-T8铝锂合金是具有低密度、高比强度，及精采低温机能的新型轻量化航空质料。回收光纤激光器并填充5087（Al-Mg-Zr）焊丝焊接2 mm厚2060-T8铝锂合金，研究了工艺参数对焊接讨论热裂纹敏感性的影响，阐明白焊接讨论的显微组织及力学机能。研究功效表白，结晶裂纹敏感性随激光功率和焊接速度的增加而增加，随送丝速度的增加而低落。在激光功率为3 kW、焊接速度和送丝速度为3 m/min的工艺参数下讨论成形精采，无焊接裂纹，焊接讨论的平均抗拉强度为309 MPa，断裂产生在焊缝区。同焊缝上部及下部对比，MG游戏平台，焊缝腰部熔合线四周细晶区等轴晶数量较多且柱状晶明明细化，这与熔池活念头制与界线层厚度有关。

要害词

Abstract

2060-T8 Al-Li alloy is a new aircraft material with low density, high specific strength and well properties in low temperature conditions. 2060-T8 Al-Li alloy in 2 mm thick is welded by fiber laser with 5087 (Al-Mg-Zr) filler wire. The cracking susceptibility of joints obtained under different welding parameters is investigated. The microstructure and mechanical properties are analyzed as well. The result indicates that, a higher laser power or a larger welding speed causes the increase of crack number, and a lower wire feeding rate results in a higher cracking susceptibility. Under the condition of 3 kW laser power, 3 m/min welding speed and 3 m/min wire feeding rate, the weld with great formation and few welding defects are obtained. The average tensile strength of joints reaches to 309 MPa, and the tensile fractures occur in the weld zone. At the waist of weld, the fine equiaxed grains are in larger quantities and the columnar crystals are more refined than the upside and downside near the fusion line, which resultes from the mode of fluid flow in weld pool and the thickness of the boundary-layer.

增补资料

中图分类号：TN249;TG456.7

DOI：10.3788/cjl201441.1003009

所属栏目：激光制造

基金项目：国度自然科学基金(51175008)

收稿日期：2014-04-21

修改稿日期：2014-05-18

网络出书日期：--

作者单元    点击查察

安娜：北京家产大学激光工程研究院, 北京 100124
张心怡：北京家产大学激光工程研究院, 北京 100124
王启明：北京家产大学激光工程研究院, 北京 100124
杨武雄：北京家产大学激光工程研究院, 北京 100124
肖荣诗：北京家产大学激光工程研究院, 北京 100124

接洽人作者：安娜(annaanna@emails.bjut.edu.cn)

备注：安娜(1990—)，女，硕士研究生，主要从事铝锂合金激光加工方面的研究。

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