With regard to burns during Laser soldering many factors and influences must be taken into account, from positioning, the selection of the correct focus diameter, the optimum solder wire, the process surfaces of the joining partners, through to other influencing variables.
However, there are a few basic settings that prevent surface burns:
Is your laser focus diameter optimised?
This may need to be focussed or defocussed even more. There are various approaches here, especially for stranded wires, PCBs or flex foils. You are welcome to contact us about this.
Is the angle of incidence of the laser correctly selected?
If not, this can be changed to prevent burns caused by reflections. The old physical principle of angle of incidence = angle of reflection must be observed here.
Is the solder in the form of preforms, wires or paste in the right place and available at the right time?
If this is not the case, readjustments must be made here.
Is the axis, laser, plumb line, product or assembly positioning reproducible?
To achieve this, integration of optical position correction is necessary.
Is the surface quality of the connection partners or process surface reproducible or possibly contaminated?
In these cases, you should contact your suppliers or ensure that the surface is cleaned.
Have you selected the correct emission value in your pyrometer temperature control?
These parameters can be checked in the machine settings.
Are your laser and pyrometer cyclically calibrated and/or checked?
If you are unable to do this yourself, you should consider a service call-out.
Are you working with the correct wire feed and retraction speeds and distances? Are you using the optimum solder wire diameter? Does your solder wire have the right flux? Does your solder wire have the right flux?
These parameters are defined as part of our process evaluations. If these are no longer correct or if an evaluation has never been carried out (third-party systems), the manufacturer's service department should be contacted. EUTECT also carries out this work on third-party machines if requested by the customer.
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