brass to brass with a tig is as easy as welding steel it needs a lot of head like aluminium but it's welded with toriated electrode sharpen to a fine point on a streight polarity like steel it's the best of both world . i prefere pure argon but argon helium mix is the way to go there you will need to purge the tube to prevent incurtion on the revese (or inside the tube). i normaly use part of my plate as welding rod it's exactly the same aloy so no trouble in fusing but if need be i wil use uncotaded silicone bronze or copper chromium aloy