That's funny
Merriam-Webster has this to say about "sawder"
"\Saw"der\, n. A corrupt spelling and pronunciation of solder"
sawder (according to m-w) is a corrupt pronunciation of solder.
Anywho, as far as I can tell, based on the M-W (an American dictionary), its pronounced "sodder"
sod - like pod
Now, if you check the Macquarie dictionary (reference to Australian English), then its pronounced
solduh
sol as in solemn
and duh...
uh = a in apart,
Moving right along...
Collins English (English as in Great Britain

, sorry I've misplaced my OED)
That's a fun one, 3 alternate pronunciations
1) soel-der, soe as in sew (British pronunciation?)
or
2) sol-der as in solemn (ie Australian pronunciation)
or
3) sodder as in sod (ie American pronunciation)
Collins doesn't bother explaining how to pronounce "der"
I wish I could find my Oxford dictionary
