Ketan , with only a few of PTH's yo' right, saves time, as long as you have decent welders. I would not solder upside > solder runs down the component too readily , flooding/swelling the legs, it's a mess . Solder from PTH components side , with legs properly trimmed , than you have no problems , good heat approach, full barrel. Needless to say a tear of solder on iron will get you there faster, operators have a bad habit of keeping tip dead/"clean"/dry/cold, by ever so diligent wipes ! Feed wire between leg and tip poked to hole, some of the handsoldering seen would give Jim fits, never just assume it's simple enough > it ain't . Desire of add flux abolishment is indeed commendable . ave a goood wknd pk -----Original Message----- From: Ketan Bhatt [mailto:[log in to unmask]] Sent: Friday, 18 August 2000 15:32 To: [log in to unmask] Subject: [TN] Manual soldering of PTH joint from component side. Hi TechNetters !! I am facing a typical problem. Our boards have 80~90 smt components on them and all are on one side. Balance of PTH components are on both the sides so after reflow, we use manual soldering. I am looking forward to do manual component insertion and soldering from component side to save time. My question is - Is it the right way to solder the component from comp side? How do we ensure proper filling of PTH and proper joint at solder side? We are using no-cleaned cored solder wire from Kester. Presently we are using additional flux but I want to eliminate it. Looking forward to your answer. Thank you in anticipation. Bye, Ketan Bhatt Secure Meters Limited. India. ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################