本研充是用自制的温室弯曲专用装置(带体视显微镜及照相机)对Ti-6A 1-4V钦合金薄板TIG焊接接头进行弯曲试验，直接现察及拍摄裂纹起始及扩展的动态过程，对炸缝表面氧化层进行俄歇能谱分析，对接头进行金相及电镜观察。结果丧明，焊缝表而不同程度的固态氧化对弯曲塑性有-定影响，似不如组织影响强烈。焊后经:730℃/6hr真空退火，能改善焊缝组织提高其弯曲塑性。

This paper describes the results of bending test at roo m tem perature forTIG welded joints of Ti-gAl-.lV alloy sheet using a special bending test app-aratus developed in the authors laboratory.The dynamic processes of the initiation and propagation of cracks during bending were。directly observed and photographed by- a stereo microscope.The oxide layers of the weld sur-face were analyzed by Auger electron spectroscope.人nd the microstructure of the joints was observed under optical and electron microscopes.The test re-suits show that the effect of the microstructure of welded joints on bending ductility is greater than that of oxidation degree of the weld surface.The microstructure and the bending ductility of the weld can be improved by vacuum annealing at 730℃/6hr.