What's inside
As an Amazon Associate I earn from qualifying purchases. This post may contain affiliate links at no extra cost to you.
Titanium exhaust work is less about maximum amperage than about controlling heat and keeping oxygen away from the hot metal. A small, well-equipped TIG machine can weld thin exhaust tubing; a high-output machine without a purge setup can still produce brittle, contaminated welds.
What titanium exhaust welding requires
Most exhaust tubing is thin enough that a machine with a 200-amp rating has ample capacity. The more important features are stable low-amperage output, foot-pedal control, high-frequency start, and a good torch. For tubing around 0.035–0.065 inch thick, you will often work in roughly the 25–70 amp range, depending on joint fit, position, and heat sinking. These are starting points, not settings to copy blindly.
Use DC electrode negative (DCEN), pure argon shielding, and a clean, close-fitting joint. Titanium needs protection on the front and back of the weld while it is hot. That means torch shielding, trailing shielding where practical, and an argon back purge inside the tube. A machine cannot compensate for a poor purge. If the back of the weld turns gray, chalky, or white, treat it as contaminated rather than relying on appearance from the outside.
TIG welder options compared
| Welder type | Best fit | Trade-off |
|---|---|---|
| 200-amp inverter DC TIG | Dedicated titanium exhaust work and most thin stainless or mild-steel fabrication | No AC aluminum TIG; quality and pedal feel vary by machine |
| AC/DC TIG machine | A shop that also welds aluminum | Costs more, and the AC function is unnecessary for titanium |
| Basic scratch-start DC TIG setup | Occasional, non-production work on a tight budget | Less convenient arc starting and limited control; harder to manage delicate starts and stops |
Best all-around choice: a 200-amp DC TIG package
For a home exhaust project or small fabrication shop, a reputable inverter DC TIG package is usually the sensible buy. Look for adjustable amperage, a foot pedal, high-frequency start, post-flow adjustment, and a torch that can accept common consumables. A unit with a 10–200 amp range is more than powerful enough for exhaust tubing; low-end stability and pedal response matter more than the headline maximum.
Compare packages carefully. Some include a pedal and regulator, while others require those purchases separately. A pedal is particularly useful on thin tube because you can reduce heat as the puddle grows. A quality regulator and a leak-free gas setup matter too: unstable flow can pull air into the shield, while excessive flow can create turbulence and contamination.
Browse 200-amp DC TIG welders with a foot pedal and verify what each package actually includes before buying.
When AC/DC is worth paying for
An AC/DC TIG welder makes sense if you also plan to weld aluminum. Its AC capability is not needed for titanium, which is welded on DCEN. If titanium exhaust is the main job, putting the extra budget toward a proper purge kit, a torch, and fit-up tools will generally improve results more than buying AC output.
AC/DC machines can also be a better long-term shop purchase if material variety is the priority. The trade-off is cost and potentially more controls to learn. Don’t choose one simply because its maximum amperage is higher; thin-wall titanium does not benefit from a large current rating by itself.
When a cheaper DC machine is enough
A lower-cost DC TIG machine can work if it has stable output at low amperage and you can add a pedal or otherwise control current reliably. For a one-off project, a basic machine may be adequate when the joints are accessible and you have time to practice on scrap. The compromise is usually convenience and control, not a lack of raw power.
Scratch-start equipment is less forgiving for repeated starts on thin tubing because the electrode can stick or disturb the joint during arc initiation. If your plan includes several short sections, tight bends, or many tack welds, high-frequency start is worth prioritizing. Check the machine’s duty cycle at the current you intend to use; a short exhaust job may not need a heavy industrial rating, but repeated work can expose a small machine’s limits.
Budget for shielding and preparation
Titanium welding requires clean handling. Remove oil, paint, oxide, and fingerprints from the joint area with dedicated, uncontaminated tools. Use clean filler matched to the material, and avoid touching cleaned edges with bare hands. A close fit reduces the time the metal is exposed to heat and makes burn-through less likely.
Plan for an argon purge arrangement with a way to control flow and vent displaced gas. Seal the tube ends as needed, but leave a vent: trapping expanding gas in a heated tube can disturb the weld. Purge thoroughly before striking an arc, then maintain protection through the hot part of the cooling cycle. A trailing cup or gas lens can help shield the face, particularly on an exposed weld.
For consumables and setup, compare TIG argon purge kits for tubing alongside the welder. Also allow for argon, tungsten electrodes, suitable filler, and clean stainless brushes reserved for the job. A weld with heavy oxidation is a warning sign; increasing amperage is not the fix. Check purge coverage, gas leaks, drafts, fit-up, and shielding before changing machine settings.
A practical buying checklist
Before ordering, confirm DC TIG capability, a usable low-amp range, high-frequency start if you want easier arc initiation, and compatibility with a foot pedal. Check whether the supplied torch and regulator suit your work and whether replacement consumables are easy to find. A 120-volt machine may handle thin tubing, but input-power limits can reduce its usable output; a 240-volt supply gives more headroom, though it is not automatically necessary for this application.
Finally, practice on offcuts of the same tubing and wall thickness. Tune current and travel speed until the bead is consistent, the joint penetrates without sagging, and the backside remains protected. For titanium exhaust work, that combination of a modest DC TIG welder, careful purge, and clean technique is a better purchase strategy than paying for amperage you will never use.