What Current and filler rod? Anybody do it before? Can you join ti to stainless?
you are correct! Or you can make a trailing cap for your torch (which is kinda hokey, but it will work ok) You need to keep the metal blanketed in argon until it cools.I believe to weld Titanium, you have to completly enclose the part being welded in an inert atmoshpere. In other words you'd have a sealed box, full og Argon, to weld it, not just what comes out of the torch tip.
where did you find this info i would like to read more about this. As far as the blast and friction welding im not even sure you can use these processes with titanium i just know you can use it with aluminum ,steel, and stainlessI am surprised your books didn't mention anything like this:
a few quick quotes I found:
"What really separates titanium welding from most other types of GTAW is the need for an argon cover on the weld’s back side. Wherever the titanium is heated, brittle alpha-case can form. For very complex parts with interior passages or parts that require a lot of welding repairs, glove boxes may offer an economical answer. For parts too large to fit through the glove box, special flexible polyethylene plastic bags, complete with attached gloves, can be used. Use a purge monitor to see when the bag contains clean-enough argon, strike an arc, and weld away. Working in airtight gloves, especially for extended periods, can be hot, but doing so is part of the challenge of working with titanium."
"Gas-tungsten arc welding is the most widely used process for joining titanium and titanium alloys except for parts with thick sections. Square-groove butt joints can be welded without filler metal in base metals up to 2.5 mm thick. For thicker base metals, the joint should be grooved, and filler metal is required. The heated weld metal in the weld zone must be shielded from the atmosphere to prevent contamination with oxygen, nitrogen, and carbon, which will degrade the weldment ductility."
welding it to dissimilar metals
"Titanium reacts readily with air, moisture, grease, dirt, refractories, and most other metals to form brittle compounds. Reaction of titanium with gases and fluxes makes common welding processes such as gas welding, shielded metal arc, flux cored arc, and submerged arc welding unsuitable. Likewise, welding titanium to most dissimilar metals is not feasible, because titanium forms brittle compounds with most other metals; however, titanium can be welded to zirconium, tantalum and niobium."