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Four-Ball Weld Point

Glossary Term

Definition and Purpose

The Four-Ball Weld Point is a critical parameter defined in ASTM D2596. It represents the load at which a lubricant can no longer prevent metal-to-metal contact, resulting in the welding of standard steel balls used in the test. This point is essential for evaluating the extreme pressure properties of a lubricant and its ability to protect against wear and seizure under high-load conditions.


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