Cutter Failure
Bad Surfaces And Too Much Heat
|
|
|
Several problems
- Sloppy brazing - the braze alloy ran all over the steel
- Uneven heating. The side in the right photo got a lot more heat than the side in the left photo. Those nice, little round holes are caused by a metal (usually Zinc) boiling out of the alloy. This is much too hot. The left side has two holes at the very bottom. This side also got too hot . The location of the holes shows that the joint was not heated evenly from top to bottom.
|
The braze alloy wouldn’t stick to the carbide. They kept heating it until it stuck somewhat. I would guess that the braze alloy got liquid enough to form a purely mechanical bond using the roughness in the carbide. This is not a rough piece of carbide so the bond was very weak. For more solutions to Brazing Problems browse our How to Braze Section or take a look at our Brazing Solutions Article. |
|
