T/CI 062-2022 Active

Scope: This document specifies the water immersion automatic ultrasonic testing method and quality grading for gas valves of medium-speed internal combustion engines. This document is applicable to gas valves with welded surfaces and friction-welded rods of medium-speed internal combustion engines. Main technical content: The method outline uses water immersion automatic detection. Specifically: a) The welded layers on the valve surfaces of gas valves and the near-surface defects on the friction-welded rods are detected using water immersion line-focused probes; b) The internal defects on the friction-welded rods of gas valves are detected using water immersion flat probes. 6. Detecting System 6.1 The performance of ultrasonic testing instruments shall comply with the requirements of GB/T 27664.1. 6.2 Probes shall comply with the requirements of GB/T 27664.2 and JB/T 12466. 6.2.1 Probes are divided into water immersion line-focused probes and water immersion flat probes. 6.2.2 The recommended frequency of water immersion line-focused probes is 10 MHz. 6.2.3 The recommended frequency of water immersion flat probes is 2.5 MHz, and the diameter of the probe chip should cover the diameter of the gas valve being inspected. 6.3 Coupling agent shall preferably use distilled water as the coupling agent, and add special anti-rust agents. It is strictly prohibited to use corrosive liquids as the coupling agent. 6.4 The combined performance of the automatic detection system shall comply with the requirements of GB/T 27664.3 and JB/T 12725.