Worming

Technical Support

Struggling with a specific casting defect or just need general technical support?

  • Excessive metal with a worm-like appearance that normally occurs in corners

  • Indicates metal penetrating weak areas, located on the edges of the shell

Causes of this defect are evident in the shell portion of the process; to cure, R&R recommends taking the following actions:

Shell

Poor draining due to high viscosity.


Slurries need to be applied in an even, uniform coat. When the slurry viscosity is too high or the tree is not drained properly, heavy layers of slurry are left behind. Verify that the slurry viscosity is within the recommended operating targets. If not, adjust accordingly.




Poor draining practice.


Slurries need to be applied in an even, uniform coat. If slurry viscosity is in range, the draining technique may be leaving heavy layers of slurry behind. Observe draining technique. If heavy layers of slurry are being left behind in defect-prone areas, draining must be adjusted so that slurry does not build up prior to stucco application.




Gelling primary slurry.


Check binder stability and implement a proper slurry control program including a gelation test.





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