pinhole

1.The formation mechanism of orange valvule-like pinhole in rolled aluminium foil was investigated by using optical microscopy,scanning electron microscopy,and energy dispersion X-ray spectrum.

利用光显微镜、扫描电镜、能谱分析等试验手段中"桔瓣"形针孔形成的原因进行了分析。

2.Pinhole. A short unwelded area in the weld line extending through the entire pipe so that fluid will leak out through the area very slowly.

针孔。指焊缝线上位焊接的、贯穿管子整个壁厚的细孔，可导致流体从该孔缓慢漏出。