M/C # B-2 assembly machine, Part # AU-223. Parts must be hot in order for the assembly machine to insert the bearing in. Parts were accumulating in the bowl & not moving on the track due to the vibration & the weight of the track being light. This caused the parts to cool down and assembly is rejecting it. Maintenance welded a metal plate under the inline track, so it does not get effected by the vibration of the bowl and parts now moving smoothly.