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1·Weld metal zone are mostly acicular ferrite which can improve the weld zone toughness.

焊缝金属区晶粒分布均匀，焊缝金属区多为针状铁素体，能够提高焊缝区的韧性。

2·The results show that microstructure of weld zone greatly changes in the radial direction.

结果表明，焊缝组织沿径向有较大的变化。

3·The tensile strength and the elongation percentage of the parent metal and the weld zone increased slightly.

冲击处理使焊缝区和母材区的强度和伸长率均有所增加。

4·Results After stress-corrosion test, there was no discoloration in the weld zone of the laser-welded cast samples.

不进行应力腐蚀试验的激光焊接铸钛试样作为对照组。

5·The weld zone is the weakest in welded joint due to effects of chemical components of filler and crystallization process.

因焊丝合金化学成分和结晶过程的影响，焊缝处是合金接头的薄弱环节。

6·Original preheating temperature: the temperature of the workpiece in the weld zone immediately prior to any welding operation.

初始预热温度是指任何焊接操作开始之前，焊接区域内工件的瞬时温度。

7·The hardness tests on welding joints prove this by showing that the hardness reduces in fusion area, and increases slightly in weld zone.

通过对焊接接头的硬度检测，发现熔合区硬度下降，焊缝区略有上升。

8·The fracture rod has cracks in the microstructure of weld zone, intergranular cracks exists in the coarse grain zone of the weld heat affected zone.

进一步比较了断裂拉杆和已经产生裂纹的拉杆焊缝区的显微组织，发现在焊缝的热影响区粗晶区存在沿晶裂纹。

9·Crack propagation conducts alternatively between the weld zone and the partially molten zone, and is not strictly to rupture at W/F boundary surface.

裂纹扩展在焊缝区和半熔化区之间交替进行，并非严格按W／F界面破断。

10·After solution treatment, the weld grains become coarse along with a large amount of granular precipitates dispersed in weld zone and base metal zones.

经过固溶处理后，焊缝组织晶粒变大，焊缝区和母材区弥散分布着大量的颗粒状析出物。