含表面裂纹铝合金焊缝低温断裂性能

Fracture Toughness of Surface Cracked Welding Seam of Al-alloy at Low Temperature

本文采用表面裂纹法，利用自行研制的低温多试样拉伸装置，研究了一种航天铝合金材料的焊缝在低温下（２０Ｋ）的断裂性能，并对断口进行了电镜显微分析，为提高质量的焊接提供了依据。

n this paper,surface crack test method(SCTM)was used to study fracture toughness of surface cracked welding seam of Al-alloy at low temperature(20K).Tests were performed on a multi-specimen tensile aparatus adn fractured surfaces were observed by scanning electron microscope(SEM).This study may provide a basis for high quality welding.