Dye Penetrant & Leak Testing of Copper Castings
渗透探伤与气密性检测
标签：渗透探伤, 气密试验, 氦检漏, ASTM E165
铜铸件表面缺陷检测首选取色渗透（PT）：喷渗透剂停留 5–10 min、清洗后显像 10–30 min，在 ≥1000 lx 白光下判读，执行 ASTM E165/E1417。气密件（阀体、管接头）充 0.4–0.6 MPa 氮气浸水检漏，要求更高时用氦质谱检漏（灵敏度 10⁻⁶ Pa·m³/s 级）。注意连通性缩松会缓慢渗漏，须保压 15–30 min 才能暴露；内部缺陷则 X 光按 ASTM E272 评级。验收等级必须写进图纸（注明 ASTM 或 ISO 级别），否则检验争议无据可依。
For copper castings, surface inspection starts with dye penetrant: dwell 5–10 min, develop 10–30 min after cleaning, and read under white light of 1000 lx or more per ASTM E165/E1417. Pressure parts (valves, fittings) get 0.4–0.6 MPa nitrogen with underwater bubble testing, upgraded to helium mass-spectrometer leak detection (10⁻⁶ Pa·m³/s class) for tighter specs. Interconnected porosity weeps slowly — hold pressure 15–30 min to expose it — while internal defects are radiographically graded to ASTM E272. Acceptance levels must be stated on the drawing (ASTM or ISO grade); otherwise inspection disputes have no baseline.