unwelded

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。线上位接的、贯穿管子整个壁厚的细孔，可导致流体从该孔缓慢漏出。

and a recently approved Uniform Fire Code Standard,80.106, requires a mechanical ventilation rate of 200 fpm across all unwelded fittings).

近来通过的统一消法标准80.106要求通过所有无接装置的机械通风速度为200fpm）。