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2219合金TIG补焊接头亮线影像成因及其力学性能
彭江涛1,欧阳婷婷1,龚习1,李庆庆1,韩磊1
天津航天长征火箭制造有限公司,天津 300462
摘要:
针对2219合金TIG补焊接头X射线底片亮线影像,开展2219合金不同坡口面角TIG补焊接头组织及性能研究。通过X射线、扫描电镜及能谱仪分析接头底片亮线影像位置对应的微观形貌及成分,并通过拉伸试验评价补焊接头力学性能。结果显示:在0~20°随坡口面角α值的增大,X射线底片上亮线影像的黑度逐渐降低;Cu含量较高的α(Al)+θ非平衡共晶组织对X射线的散射与吸收作用较强,是X射线底片亮线影像的成因;坡口面角α角侧受电磁搅拌作用弱于β角侧,其固-液界面前沿的边界层宽度大于β角侧,且温度梯度及边界层内的成分过冷度均大于β角侧,促进了α角侧枝晶的生长。当β角为20°时,在0°~20°随着α角度值增大,接头的抗拉强度与延伸率逐渐增大,20°时获得了优良的室温力学性能。X射线底片上存在亮线影像的补焊接头力学性能满足型号使用要求,亮线影像结构可不按焊接缺陷处理。
关键词:  坡口面角  X射线影像  非平衡共晶组织  微观形貌  力学性能
DOI:10.12044/j.issn.1007-2330.2020.03.015
分类号:TG444
基金项目:
Bright Line Image Formation and Mechanical Properties of 2219 Alloy TIG Repairing Welding Joints
PENG Jiangtao1, OUYANG Tingting1, GONG Xi1, LI Qingqing1, HAN Lei1
Tianjin Aerospace Long March Rocket Manufacturing Co.Ltd.,Tianjin 300462
Abstract:
The microstructure and properties of TIG repairing welding joints of 2219 alloy with different bevel angle were studied against the bright line image in the X-ray film.After X-ray detection,SEM observation,energy spectrum analysis,and tensile test,it was found that,the blackness of bright line image in the X-ray film decreased gradually,with the increase of the α bevel angle at the range of 0° to 20°.In addition,the α(Al)+θ non-equilibrium eutectic structure with high copper content,had a stronger effect on X-ray scattering and absorption,which was the cause of bright line image in the X-ray film.Meanwhile,the electromagnetic stirring nearby the α bevel angle was weaker,and the boundary layer width in front of the solid-liquid interface was wider,than that of beside the β bevel angle.Also the temperature gradient and the degree of constitutional supercooling in the boundary layer was larger than that of alongside the β bevel angle,both of which promoted the growth of the dendrites beside the α bevel angle.When the β bevel angle was for 20°,the tensile strength and elongation of the joint gradually increased with the increase of α bevel angle,in the range of 0° to 20°,and the excellent room temperature mechanical property was obtained at 20°.The bright line image in the X-ray film of the repair welding joint could not be treated as the welding defect.
Key words:  Bevel angle  X-ray image  The non-equilibrium eutectic  Microstructure  Mechanical properties