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| Chinese National Standard Category: Air intake/exhaust system |
| English Title: | Internal combustion engines-Intake and exhaust valves-Part 4:Friction welding valves—Ultrasonic testing |
| Chinese Title: | 内燃机 进、排气门 第4部分：摩擦焊气门 超声波探伤 |
| Standard No.: | JB/T 6012.4-2008 |
| Category No.: | J93 |
| Issued by: | NDRC |
| Issued on: | 2008-6-4 |
| Implemented on: | 2008-11-1 |
| Status: | valid |
| Superseded by: | |
| Superseded on: | |
| Abolished on: | |
| Superseding: | JB/T 5093-1991 |
| Word Count: | 4000 words |
| Similar Standards: |
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