Welding Invar 36

Probaly late here.

A weld of that thickness would probably go best in the mig process. That's a big hole to fill.

As far as I know-there is no Invar 36 filler.

I'd have to research compatibility with available fillers.I'm sure that a compatible filler is available.

I weld Kovar (a related alloy) on a very regular basis. Thinner stuff-1/4" or less. Have been using a nickel 55 or 60 cast iron filler with good success on tig. I don't used de-fluxed stick rod. This bare wire is available, but you have to ask. The last load I got was from Natweld/Inweld. I'm sure there are other suppliers as well.

Good Luck

brande

There is a Nilo 36 filler that is used for welding Invar. Boeing uses it to repair the Invar molds for plane wings.

Inco used to sell it. I have a spool in my storage cabinet.

What sort of wings? Does Invar have some miracle property other than its low tempco? I wouldn't have thought wings were THAT critical.

Ted

Multi-pass TIG? Invar 36 filler rod is available. I have a box of 1/8" diameter I picked up at Boeing Surplus.

Ted

Invar is "invariable" over a wide temperature range.

Fiberglass wing molds have to be able to hold dimension even as the fiberglass heats up while curing.

I got the spool of Nilo 36 and then called Inco to find out what it was.

Ni = Nickle , Lo = low thermal expansion , 36 = 36% nickle

They were very surprised to find that Boeing was dumping it at Salvage because they were paying Inco about $50/lb. for it specifically to repair wing molds.

I tried using it to MIG weld some cast iron once. It kind of worked, but TIG and pure nickle rod worked better.

I still have 2 spools of the stuff.

Thnx folks. You cleared my mind. I picked FC 36, .045 wire will try MIG. Will let you know if I screw up 1mln job order.