How can suck back porosity in a casting be prevented?

Show Answers

Raising the temperature gradient between the mold and the metalEnhancing the molten metal flow rateExpanding the sprue attachment point by flaring itApplying all of the mentioned methods

Explanation

Suck back porosity occurs when molten metal is drawn back into the sprue, causing defects. This issue can be avoided by flaring the sprue attachment point, which helps maintain proper metal flow and prevents air entrapment. Increasing the temperature difference or the flow rate alone does not effectively eliminate this porosity.