Fracture Toughness of Surface Cracked Welding Seam of Al-alloy at Low Temperature
含表面裂纹铝合金焊缝低温断裂性能

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.