A method is provided for forming a ball at a lower end of a material solder wire which is arranged generally vertically. The method comprises the steps of: forming an upward stream of an oxygen-free gas surrounding the solder wire; bringing a lateral flame of combustion to a ball forming position adjacent...http://www.google.fr/patents/US5538176?utm_source=gb-gplus-shareBrevet US5538176 - Method of forming a ball end for a solder wire
