For each specimen, cracks appeared on the chord connecting face, and extended along the weld connecting the plate and chord, which led to the performance degradation and failure of the connection.
对每个试件，裂纹出现在弦管连接表面，沿弦管与节点板的连接焊缝扩展，并导致性能退化及破坏。
2
Occasionally porosity can be found in the face of the weld while sometimes the face may appear porosity free, but deep inside the weld, porosity may exist.
偶尔孔隙中可以找到面对焊缝而有时面对可能出现孔隙免费的，但内心深处的焊缝，孔隙度可能存在。
3
In the microhardness survey test, a pyramid-shaped diamond is impressed into 23 or more points across the face of a weld sample cross section.