On Jul 14, 12:06*pm, Matty F wrote:
On Jul 14, 11:00 pm, cynic wrote:

Cast is VERY difficult to weld properly. the usual way is to slowly
heat the piece up to red hot, weld it with appropriate rods and cool
it down slowly. Unless you know someone with the right skills its
going to be expensive.
I'd be inclined to try brazing then make a shaped clamp plate to go
over the flange and once complete hide it with paint. Is it an exhaust
pipe from some static engine or something else?

The pipe is bolted inside a firebox that's red hot and contains steam
at 110 psi.

In days of yore, there were steam boilers that ran at a few PSI made
out of cast iron sections. They were intended for heating buildings
and common in America but not over here.

However they are inherently extremely dangerous devices. People have
been killed by boiler failures.
Cast iron has been outlawed for seventy or eighty years for steam
vessels. You need to forget all about this project or someone could
get killed.

All steam vessels by law have to be insured and inspected annually.
There's absolutely no way you could achieve this, it would fail any
inspection.