FAQ
About galling (seizure) of soft metal
By using metal mold with metal adhered to it, part of the metal will melts due to frictional heat and thus galling will occur.
Soft metals are more likely to adhere and cause galling.
Adhering: the bonding that occurs when 2 types of metals approach one another at an atomic level
Galling: the state when the friction factor increases suddenly from adhering or welding
Affinity mechanism: 1) Adhering > Galling > Affinity 2) Galling > Affinity
Q&A in the same category in this question
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Can a carbide be fixed into position via magnetic fixture during processing?
While carbide is magnetic it is weak, making use of magnetic chucks dangerous.
We recommend using a vice, reinforcing plate, or bonding adhesive. -
What’s the difference between EDM cracks and heat affected layers?
Both occur from thermal energy during EDM. An heat affected layer is made of melted and solidified Co and WC particles, and a crack occurs from EDM impact or the stress of shrinkage from melting and solidifying.
An altered layer occurs only on part of the processed layer, but a crack may occur through the original material, as well. -
I would like to have tapping applied to the carbide parts.
We recommend direct tapping. Tapping is done after taking into account the amount of shrinking that will occur during sintering.
It is tougher than electrical tapping or bush brazing.
If any pitch accuracy is required, we recommend electrical tapping or brazing.
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