This way could measure the properties and shows the distribution law of every narrow zone of the welded joint especially the bond line .

该方法能够准确地测定 焊接接头各狭窄区域内材料的性能值以及它们的变化规律，特别是 熔合线附近材料性能的变化梯度。

The results show that the most nonuniformity of mechanical properties and micro structure is located in the bond of the welded joint and the bond is the weakest zone of the welded joint .

结果表明，在 熔合区组织不均匀性与力学性能不均匀性最为 严重，是 焊接接头最薄弱的环节。

The testing results showed that the weakest fracture toughness of welded joints was at the overheated zone of HAZ nearing the bond line and the low toughness brittle failure was caused by the existance of the widmanstatten structure and structural heredity of HAZ .

结果表明， 焊接接头断裂韧性的薄弱环节在热影响区（HAZ）近 熔合线的过热区，该区中粗大的魏氏组织和部分组织遗传现象是导致低韧性脆化的主要原因。

The second one is to investigate the corrosion properties of laser welded Ti The third one is to investigate the bond strength of low-fusing porcelain to laser welded Ti .

第三部分是研究激光 焊接对钛铸件和钛专用瓷 结合强度的影响。