In article , Roy
wrote:

I got tasked (by the better half) to make good onmy promise to make
her some outside wrought iron items. Trellis, gate way arches, tables,
stands, arbors etc etc etc....(she has quite an extensive list).
Anyway I got a King Decorative Metal Supply catalog of all kinds of
pre-made components for this type stuff, and have a question or two on
welding things up.

Lots of their design compnents are made from cast iron. Lots are made
out of cast aluminum, however the cast alum pieces have steel weld
tabs cast into them so joining them to structural steel tube is not a
problem. Just how do you attach the cast iron pieces to the tube? Is
this normally welded to the tube by way of MIG or is it brazed O/A

I have only a MIG, and stick machine, but a lot of what the wife wants
is cast iron decorative compnents such as a series of corner brackets
and freizes etc that need to be incorporated into the trellis and
arbors etc. Is MIG suitable to attach the cast iron to the steel
support tubes?

What had started out as a simple project using a ring roller and
scroll former soon turned into a nightmare once the wife seen all the
designs and components in the King Metals catalog, now its a nightmare
trying to decide what one really wants and what components to
use........
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Opinions expressed are those of my wifes,
I had no input whatsoever.
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Usually the cast iron pieces are annealed so they are weldable.
The simplest solution is to Stick weld them with nickle rod, or MIG
weld them with stainless steel wire.
309 would be my choice in SS.