Hi Phil,
Depending on design, the commercially available soldering bars remain
sufficiently flat up to about 2 inches in length [for more details, see my papers
Engelmaier, W., “Transverse Joulean Heated Soldering Tool for Mass Terminations,”
Proc. NEPCON/West, Anaheim, CA, February 1979, pp. 228-235.; and Engelmaier,
W., “Transverse Joulean Heated Double-Sided Reflow Soldering Machine for Mass
Terminations,” Proc. NEPCON/West, Anaheim, CA, February 1981, pp. 333-339].
Actually more of a concern may be temperature uniformity, which becomes even
more of a concern with lead-free solders.
One other concern is the amout of solder present—too much and you get shorts,
too litlle, well...One solution is a soldering bar with a bottom surface that
is not flat, but rounded, thus giving you solder joints that get thicker away
from the bar center and thus being able to successfully accommodate a larger
variation in solder volume.
Werner
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