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Technical notes...
 
We hope these notes are of interest - do call us or use the contact form if you need any further advice...
 
Soldering - Definition
Soldering basics
Soldering points - Metallurgy
Thermodynamic fundamentals
Chemical fundamentals
Geometrical fundamentals
Automatic iron soldering
The soldering tool
The thermodynamic behavior
Selection of soldering tips
   
Geometrical fundamentals
solder geometrical fundamentals
solder geometrical fundamentals
Fig 7: Solder geometrical fundamentals
In general, reproducible situations must be ensured. The tolerances consider all subassemblies like: Indexing, work piece carrier, work pieces, system of coordinate and used soldering tools. These sub-tolerances often sum up considerably. Aci-ecotec soldering systems can process tolerances of +/- 0.3mm, depending on the soldering point. Reproducible soldering points are not possible with larger tolerances. The soldering pads should have a minimum width of 0.3mm. The larger the contact surface of the soldering tip, the better the heating of the soldering point and consequently the soldering result.
Sharp edges or corners have an negative influence on the flowing behavior of the solder.
The best for the soldering process is a so-called 90 degrees corner, in which the soldering tip can be inserted and pressed against the soldering point. In general, one can proceed that the total tolerance must not exceed +/- 0,3. (Fig. 6 and 7) Do not forget: The total tolerance
is not made up soley by the work piece tolerances, but also by the tolerances of the work piece fixtures and the transport system and applies for the three dimensions. A closer investigation of the tolerance often shows that this requirement would result in unacceptable single tolerances. What is to do now, what are the possibilities to bring the positioning of the soldering point in relation to the soldering tool within the required tolerance field?
Soldering connection between punched parts and bent parts
 
Automatic iron soldering