Does anyone have theories regarding the size/placement/number of air
holes needed for safety when soldering closed shapes? An example:
Imagine a cylinder 25 mm tall made of 0.5 mm sheet and closed on
both ends with 0.5 mm sheet. Put an 8 mm hole in each end and stick a
tube (25 cm long; 8 mm ext. dia. with 0.5 mm wall) thru the tube.
Solder the tube and the cylinder together. What is needed in the way
of air holes (size/placement/number) in the part of the tube which
lies within the cylinder in each of these situations:
The tube is open at both ends.
The tube is capped at both ends, and one end has a 2.5 mm hole.
A colleague of mine says there is a BIG difference between one
2mm-hole as opposed to two 1mm-holes. Do you agree?
Another factor is if you solder only one end of the cylinder to the
tube leaving the second end with a tight (but non-hermetic) fit. Is
the amount of air that can escape through a tight, unsoldered fit
There are of course MANY factors in determining safety air holes:
size of closed shape, thickness of sheet, relative proportion of size
of shape to thickness of sheet, complexity of the total item (how
many such shapes are connected), etc. My present project involves
three closed shapes (cone, cylinder, and triangular ‘cylinder’)
soldered to a tube whose outer diameter goes from 6mm to 8mm to 5mm
to 2.5mm. Each soldering will require multiple considerations, but I
was hoping someone might have some general principles…Failing that,
theories regarding the above examples would be of great interest.
By the way, there will be two more closed shapes (dome and sphere)
on the tube. They will be threaded onto the tube last, and then the
whole complex item will be closed with a 2mm-diameter screw into the
open end of the tube).
Janet in Jerusalem