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Article: Regulating reduced pressure testing for evaluating hydrogen levels.(vacuum control)
- Article from:
- Modern Casting
- Article date:
- February 1, 2006
CopyrightCOPYRIGHT 2006 American Foundry Society, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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The reduced pressure testing of aluminum melts for evaluating hydrogen levels in the molten alloy has been performed using the same basic method for more than 50 years. But, while reduced pressure testing is a fairly simple procedure, faulty practices and a lack of control of important variables can distort the test results and lead to wide variations in metal quality with disastrous effects upon scrap levels and casting properties.
The True Reduced Pressure (T.R.P.) Test unit has been designed by Q.C. Designs Inc., St. Joseph, Mich. (marketed by Pyrotek, Spokane, Wash.) to minimize operator influences and eliminate many of the common sources for error in the ...