Silver soldering Cast Iron

[JD]

Can you silver solder cast iron?
I have to machine a spigot for a milling slide so I can mount it to my lathe saddle.
If silver soldering is possible would it be better to screw cut the parts or leave them plain.
Thanks John 

[daz]

Yes
http://www.cupalloys.co.uk/joining-cast-iron-c100028.html
You can also braze and soft solder (I think)
Make sure everything is cleaned with a (stainless) wire brush and preheat your parts. Cooling is also important, make sure it is slow. You can also use MIG if you have one, I have used mig before with varying degrees of success.
Type "soldering cast iron" or "welding cast iron" into google and you will have enough reading to keep you going for a few years. Also have a look at http://www.mig-welding.co.uk/forum/index.php
A british based forum with all types of welding and metal joining, a VERY informative site with tutorials and some sh*t hot welders/fabricators. I thought I could weld until I came accross that site, then I realised I was only sticking bits of metal together.

daz

[Davo J]

Have a read of this thread below, in post 2 Forrest Addy talks about silver brazing a gib together and bead blasting it before hand, it might help you out.
http://bbs.homeshopmachinist.net/showthread.php?t=51114

Dave

[John Hill]

Soft solder is possible and has the advantage of minimal heating. 

[JD]

Thanks gents for your input and the links, lots to read much appreciated.
John