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In the scratch start vs lift arc TIG choice, lift arc wins for almost every welder: it starts the arc with a light touch and lift, keeps tungsten out of the weld and saves the point on your electrode. Scratch start only makes sense when you’re turning a basic DC stick welder with no lift function into a TIG setup for non-critical steel.
The deciding factor is tungsten contamination. A scratch start drags hot tungsten across the work and can leave bits of it in the weld. A lift arc start touches at low current first, so the full arc never fires until the tungsten is clear of the metal.
| Feature | Scratch Start | Lift Arc |
|---|---|---|
| How the arc starts | Tungsten struck across the work like a match | Tungsten touched, then lifted about 1/16 in |
| Current at contact | Full set amperage | Low sensing current until you lift |
| Tungsten contamination | Highest risk | Low risk when done right |
| Tungsten point | Wears and needs regrinding often | Stays sharp longer |
| Machine needed | Any DC stick welder plus a gas-valve TIG torch | Welder with a Lift TIG mode |
| Electrical interference | None | None |
| Code work needing non-contact starts | No | No (needs high frequency) |
| Best for | Occasional DIY steel repairs | Steel and stainless DC TIG at home or in the shop |
What Is Scratch Start TIG?
Scratch start is the oldest way to start a TIG arc. You drag the tungsten across the workpiece with a motion like striking a match, and the arc forms as the tip pulls away.
The welder puts out full current the moment the tungsten touches. Everlast notes that the tungsten gets hot almost instantly, and small pieces can break off and stick in the weld. That’s why most scratch start setups are a DC stick machine, a TIG torch with a gas valve on the handle and an argon bottle.
What Is Lift Arc TIG?
Lift arc (often labeled Lift TIG) starts the arc by lightly touching the tungsten to the work, then lifting it. The machine senses the short and holds a very low current until you pull away.
ESAB’s method, as described in Industrial Machinery Digest: rest the back edge of the cup on the work, rock forward until the tungsten touches, press the torch switch, hold about 1 second, then rock back to a gap of about 1/16 in. Once the arc lights, hold an arc length close to the tungsten diameter. ESAB stresses that you touch the tungsten lightly and never scratch it.
Scratch Start vs Lift Arc TIG: Key Differences
Lift arc beats scratch start on weld cleanliness, tungsten life and ease of starting. Scratch start wins on only one point: it works on a stick welder you may already own.
Tungsten Contamination
Winner: lift arc. Scratch starts can leave tungsten inclusions, and on critical work those starts may need to be ground out and rewelded. ESAB says a proper lift start almost entirely removes the risk of tungsten inclusions. Everlast adds that lift start is still not 100% clean.
Tungsten Wear
Winner: lift arc. Each scratch rubs and overheats the tip, so you regrind more often. A lift start keeps the point on the tungsten, which also keeps the arc focused.
Ease of Starting
Winner: lift arc. With scratch start, a slow strike welds the tungsten to the puddle and you snap it free. Lift arc has a simple rhythm (touch, switch, lift) that most beginners learn in a few tries.
Equipment and Cost
Winner: scratch start, if you already own a DC stick welder. You only add a gas-valve TIG torch, a regulator and argon. Lift arc needs a machine with a Lift TIG mode, but many inverter stick and TIG welders include one.
Metals and AC Welding
Tie by scenario. Both methods are DC starts, so both suit mild steel and stainless. Everlast calls lift start a much better option than scratch start for steel and stainless, but not a good option for aluminum. For AC aluminum, plan on a machine with high frequency start.
Electrical Interference
Tie. Neither method uses high frequency, so neither one disturbs nearby electronics. ESAB notes that HF current can interfere with laptops and CNC machinery, which is one reason lift arc was developed.
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Where High Frequency Start Fits
High frequency (HF) start is the third option, and it never touches the work at all. ESAB describes it as a high-voltage, low-current, high-frequency signal on the welding lead that ionizes the gap so the arc jumps across.
Some codes for pressure vessels and process piping require non-contact starts, which rules out both scratch and lift arc. ESAB also notes that HF components add hundreds of dollars to a power source. For home DC TIG on steel and stainless, lift arc gets you most of the HF benefit for less money.
Where Each One Fits
- Converting an old DC stick welder for a few steel repairs: scratch start.
- Learning TIG welding on mild steel at home: lift arc.
- Stainless exhaust, brackets and food-grade parts: lift arc.
- Welding next to a CNC table or computer: lift arc.
- AC aluminum: high frequency start.
- Code pipe and pressure vessels that call for non-contact starts: high frequency start.
If you’re shopping for a machine, the start method is one line on the spec sheet next to amperage and AC/DC output. Once it’s home, the steps to set up a TIG welder are the same for both start types: torch, gas, ground, tungsten and polarity.
Tips for Cleaner Starts With Either Method
- Run the torch on DCEN (electrode negative) for steel and stainless.
- Start on a scrap tab or a copper start block, then carry the arc onto the joint.
- Match the tungsten electrode size to your amperage so the tip doesn’t overheat at the start.
- Open the gas before you touch down so argon covers the tip.
- If the tungsten dips into the puddle, stop and regrind it. A contaminated tip makes every later start worse.
Which One Should You Choose?
Choose scratch start if:
- You already own a DC stick welder with no Lift TIG mode
- You weld mild steel a few times a year
- The parts are non-critical and nobody will X-ray them
Choose lift arc if:
- You’re buying a machine and want clean DC TIG on steel or stainless
- You’re learning TIG and want fewer stuck tungstens
- You weld near electronics that HF could disturb
Need AC for aluminum or code-required non-contact starts? Skip both and get high frequency start.
Safety Note
With scratch start on most stick welders, the output is live at the torch the whole time the machine is on, and there’s no trigger to stop it. Lay the torch on an insulated holder, never on the bench, and switch the machine off before you change tungsten. Wear dry gloves and a helmet set to the right shade for your amperage.
Frequently Asked Questions
Is Lift Arc Better Than Scratch Start for TIG?
Yes, for most welders. Lift arc touches the tungsten at low current and only fires the full arc after you lift, so you get far less tungsten in the weld and a sharper tip. Scratch start is only worth it when your DC stick welder has no Lift TIG mode.
Can You Weld Aluminum With Lift Arc TIG?
Not well. Aluminum needs AC TIG, and lift arc is a DC start method found mostly on DC machines. Everlast says lift start is not a good option for aluminum and calls high frequency start the only acceptable choice. Pick an AC/DC welder with HF start for aluminum.
Does Scratch Start TIG Contaminate the Weld?
It can. The tungsten carries full current the moment it touches, so it heats almost instantly and small pieces can break off into the weld. On critical work, those scratch starts may need to be ground out and rewelded. For hobby steel repairs, the risk is usually acceptable.
Can I TIG Weld With a Stick Welder?
Yes, if it has DC output. Add a TIG torch with a gas valve, an argon regulator and a bottle, and set the machine to DCEN. Use scratch start if the welder has no Lift TIG mode. AC-only stick welders can’t run steel TIG properly.
How Do You Do a Lift Arc Start?
Rest the cup’s back edge on the work and rock forward until the tungsten lightly touches. Press the switch, hold about 1 second, then rock back to a gap near 1/16 inch. The arc lights as you lift. Touch lightly; scratching defeats the purpose of lift arc.
Final Words
Scratch start vs lift arc TIG comes down to the machine in front of you. If it has a Lift TIG mode, use it every time for cleaner welds and longer tungsten life.
Keep scratch start for a converted stick welder and simple steel jobs. Move to high frequency start once aluminum or code work enters the picture.
