What kind of metal is this?

[schemi]

I used a piece of what I thought was stainless for an exhaust hanger. It tigs nice and has great color. However, when I try to weld it to 304 stainless, it does not weld good at all. The weld is grey and very porous and cracks in a matter of seconds. This it two thicknesses welded together with no filler. When I grind on it, the sparks are bright white. I had a piece on the anvil to shape it. With the piece on edge I was hitting it with a hammer and just caught the edge of it and got a bright white spark off it

This is what I am trying to do

[H80N]

Spark Test..

Sounds like you may have gotten hold of some Titanium...

Spark test

"Titanium
Although titanium is a non-ferrous metal, it gives off a great deal of sparks. These sparks are easily distinguishable from ferrous metals, as they are a very brilliant, blinding, white color.<sup>[7]



Here is the page on it

http://en.wikipedia.org/wiki/Spark_testing</sup>

[schemi]

I was just reading that. I really like the colors in it. I have a big 2x4' probably 16g sheet of it. It has been floating around my garage for 15 years and I assumed it was stainless. Never had a need for it until now.

[Cgotto6]

Isn't it really light for the size?

[snowbird]

it sparks the same color and type as a lighter. even when water-jet cut.

https://www.youtube.com/watch?v=szkUpaO3R0I