Gas Porosity: A Guide to Correcting the Problems

The first step in resolving any defect problem to identify the defect type. There are different kinds of porosity that can look similar, so it is absolutely critical to identify the most likely cause before starting the troubleshooting process. A wrong judgment (for example, judging porosity to be shrink when it is really gas) can result in all the corrective efforts being totally wasted. This book provides information on how to best identify the causes of gas porosity in die casting and describes the corrective measures to be taken.

Identification

Flow Porosity and Gas Porosity

Pressure and Gas Porosity

Sources of Gas

Trapped Air

Venting System and Vacuum System

Runner and Gate Design

Steam and Gas From Vaporized Lubricant

Gas From Hydrogen

 Conclusion