Patent ID: 9339885
Filing Date: 2016-05-17
CPC Classification: B23K,H01L

Claim Text:
1. A method for dispensing flux-free solder onto substrate places of a substrate by means of a dispensing apparatus comprising a dispenser head which comprises a stamp, an ultrasonic head configured to apply ultrasound to the stamp and a wire feed, wherein the stamp has a working surface which has a recess open to a lateral surface of the stamp, wherein the wire feed feeds the solder wire under an angle diagonally to the surface of the substrate, and wherein a heatable support heats the substrate to a temperature above the melting temperature of the solder, the method comprising the following steps: A) moving the dispenser head to a predetermined position above the next substrate place onto which solder is to be dispensed, B) lowering the stamp until wherein the height mentioned in B2 and B3 is set in such a manner that the working surface of the stamp is wetted with solder in the later following step D, C) dispensing flux-free solder to the substrate place by: D) moving the dispenser head along a predetermined path in order to distribute the solder on the substrate place, and simultaneously applying ultrasound to the stamp, and E) raising the stamp, wherein step D is carried out either after step C3 or already begins during step C2.