Why Bell-Mouth Happens in Pipe Grooving and How to Reduce It
Bell-mouth is a common pipe-end deformation problem in roll grooving, especially on thin-wall or larger diameter pipes. This article explains why it happens, including pipe support, pressure control, roller matching, and pipe-end preparation, and shares practical ways to reduce deformation and improve groove consistency in daily steel pipe grooving work.
May 13,2026









