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September 27, 2022
2. Leakage method: The leakage part of the casting is placed at the lowest position, the metal trapping agent is dissolved in water, and the pressure of the solution is raised to about 1.5 times of the working pressure of the casting by the water pressure test method, so that the water containing the trapping agent passes through the sand hole. The filtering action blocks the binder in the sand hole. As the leakage continues, the binder in the sand eye gathers more and more, and finally the sand hole is blocked. After stopping the leakage, keep the pressure for 20 minutes, then let go of the trapping agent and leave it for 24~28h to let it dry naturally and the binder solidify. Repeat the test and use it without leaking water.
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