Mike, I'm missing something or have grown way to old. Why weld anything? Don't we still float the preg with pins in slots, etc? Misregistration is mostly caused by improper, nonhomogeneous core and preg selections introduced as too many up books in a press opening that may or may not be properly calibrated and is not properly managed. In a well managed relamination process, a very predictable flow front is effected so everything moves associatively. Therefore, without confining the dynamics of the process, there is little misregistration. I need to go back to school on this, I guess, or not. MoonMan --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------