Every new TIG welder faces the same dilemma when striking their first arc. Scratch start feels intuitive but leaves your tungsten looking like it went through a woodchipper. Lift Arc promises cleaner starts but demands equipment you might not have.
Scratch Start TIG involves touching the tungsten electrode to the workpiece and quickly lifting to initiate the arc, similar to striking a match. Lift Arc brings the tungsten close without touching, then triggers the arc when lifted slightly, significantly reducing tungsten contamination risk and producing cleaner welds.
I spent three years running a scratch-start-only setup before upgrading to a machine with Lift Arc capability.
After thousands of arc starts across both methods, I’ve learned when each technique shines and why the contamination difference matters more than you might think.
What is Scratch Start TIG?
Scratch Start TIG is the simplest arc initiation method, working exactly like striking a wooden match.
You touch the tungsten electrode directly to the metal workpiece, then quickly pull back about 1/8 inch to establish the welding arc.
Scratch Start: An arc initiation method where the tungsten electrode makes physical contact with the workpiece and is withdrawn to establish the welding arc. The simplest form of TIG starting, requiring only basic welding equipment.
The technique dates back to the earliest days of TIG welding, before high-frequency technology became commonplace.
Scratch start requires nothing more than a DC power source, a TIG torch, and a foot pedal or finger control. No fancy circuitry needed.
Here’s the basic sequence: Set your amperage, touch tungsten to metal, pull back slightly, and the arc fires. Simple in theory, trickier in execution.
The problem? That momentary contact embeds metal from the workpiece into your tungsten tip.
How to Scratch Start: Step-by-Step
- Set machine to DCEN (Direct Current Electrode Negative)
- Position torch at 70-80 degree angle to workpiece
- Hold tip of tungsten approximately 1/8 inch from metal surface
- Touch tungsten briefly to work surface (like a quick scratch)
- Immediately pull back 1/8 to 3/32 inch to establish arc
- Reduce arc length slightly once welding begins
Most beginners scratch too hard and leave tungsten embedded in the workpiece.
The goal is a feather-light touch, barely making contact before lifting away.
What is Lift Arc TIG?
Lift Arc TIG is a refined starting method that dramatically reduces tungsten contamination.
The tungsten never actually touches the workpiece at full welding amperage.
Lift Arc: An arc starting technology that activates low-current open-circuit voltage when the tungsten approaches the workpiece. When the tungsten touches and lifts, the machine ramps to welding amperage without the high-current contact that causes contamination.
Here’s how it works: The machine detects when the tungsten gets close to the metal. It drops the output to a tiny amperage (usually 2-5 amps). You touch the workpiece at this minimal current, then when you lift, the machine senses the break and ramps to your set welding amperage.
That critical difference means the tungsten touches at nearly zero power instead of full welding amperage.
The result is dramatically less contamination and a tungsten that stays sharp much longer.
Lift Arc requires specific machine circuitry, typically found on inverter-based TIG welders. You cannot add Lift Arc to a basic transformer machine.
How to Lift Arc: Step-by-Step
- Activate Lift Arc mode on your welder (switch or setting)
- Set desired welding amperage
- Hold torch at normal working angle
- Slowly lower tungsten toward workpiece until it makes contact
- The machine automatically reduces current to minimal level
- Lift tungsten slightly to trigger full welding amperage
- Begin your weld immediately
The lift action feels smooth and controlled compared to the quick scratch motion.
Most Lift Arc systems beep or click when the arc establishes, giving you clear feedback.
Scratch Start vs Lift Arc: Side-by-Side Comparison
| Criteria | Scratch Start | Lift Arc |
|---|---|---|
| Tungsten Contamination | High risk | Minimal risk |
| Equipment Required | Basic TIG setup | Inverter with Lift Arc |
| Starting Consistency | Variable, practice-dependent | Highly consistent |
| Tungsten Life | Shorter, frequent regrinding | Longer, less maintenance |
| Learning Curve | Moderate | Easy |
| Arc Quality | Good when done correctly | Excellent, clean starts |
| Equipment Cost | Budget-friendly | Moderate to high |
| Suitable for Aluminum | Difficult | Good with AC capability |
| Production Use | Rare | Common |
| Need High Frequency | No | No |
Key Differences Explained
Tungsten Contamination: The Deciding Factor
Contamination happens when metal from the workpiece transfers to the tungsten electrode during arc initiation.
With scratch start, you’re touching at full amperage. The arc essentially micro-welds the workpiece metal to your tungsten tip.
Lift Arc avoids this by making contact at minimal current. There’s not enough energy to transfer significant material.
Why does this matter? Contaminated tungsten creates an unstable arc that wanders and sputters.
Your weld quality suffers. The arc doesn’t focus properly, and you get inconsistent penetration.
I’ve seen contaminated tungsten turn a perfect weld joint into a porous mess in seconds.
Ease of Learning
Beginners struggle with scratch start because the motion feels unnatural at first.
Too timid and the arc never starts. Too aggressive and you embed tungsten in the workpiece.
Lift Arc forgives these beginner mistakes. The machine handles the tricky timing.
Most students I’ve taught pick up Lift Arc in about half the time it takes to get consistent with scratch start.
That said, learning scratch start first builds valuable torch control skills.
Equipment Reality
Scratch start works on virtually any DC TIG setup, including basic transformer machines.
You can convert a stick welder to scratch-start TIG with minimal investment.
Lift Arc requires an inverter welder with the specific circuitry built in.
This isn’t something you can retrofit to an older machine.
Entry-level TIG welders with Lift Arc start around $400-500, while scratch-start conversion kits can cost under $100.
Pros and Cons of Each Method
Scratch Start Pros:
- Works on basic equipment
- Lower initial cost
- No special machine features needed
- Can convert stick welders to TIG
- Builds fundamental torch control skills
Scratch Start Cons:
- High tungsten contamination risk
- Shorter tungsten electrode life
- Less consistent arc initiation
- Steeper learning curve
- Poor for critical or production welds
- Can leave tungsten inclusions in weld
Lift Arc Pros:
- Dramatically reduced contamination
- Longer tungsten life
- Consistent, reliable starts
- Easier for beginners to learn
- Better weld quality overall
- Suitable for critical applications
Lift Arc Cons:
- Requires specific equipment
- Higher initial machine cost
- Not available on transformer welders
- Cannot retrofit to older machines
Equipment Requirements
Scratch start requires: A DC-capable welding power source, TIG torch with appropriate cable, foot pedal or finger control, shielding gas supply, and tungsten electrodes.
You can use a DC stick welder as your power source with a simple TIG conversion kit.
Lift Arc requires: An inverter-based TIG welder with Lift Arc functionality, TIG torch, foot control, gas supply, and tungsten electrodes.
The key difference is the machine itself. Lift Arc circuitry cannot be added to a basic welder.
Most modern inverter TIG welders from brands like Miller, Lincoln, Everlast, and AHP include Lift Arc as a standard feature.
Quick Summary: Budget $300-500 for a basic Lift Arc capable machine, or under $150 for a scratch-start conversion kit. The investment difference reflects the convenience and quality improvement.
Which Should You Choose?
Choose Scratch Start If:
- You’re on a tight budget
- You already own a DC stick welder
- You’re just experimenting with TIG welding
- You weld occasionally as a hobby
- You don’t mind regrinding tungsten frequently
Choose Lift Arc If:
- You’re serious about learning TIG welding
- You want cleaner welds with less frustration
- You weld frequently enough to justify the cost
- You plan to weld aluminum or stainless steel
- You want production-quality results
My recommendation: Start with scratch start if you’re unsure about TIG welding commitment.
If you stick with it for six months and enjoy the process, upgrade to a Lift Arc machine.
The reduced frustration alone is worth the investment.
Beginner Practice Tips
For Scratch Start Practice:
Practice the scratching motion without the machine on first.
Develop a light touch rather than aggressive contact.
Focus on pulling away quickly and smoothly rather than scratching hard.
Use scrap metal to practice until your starts become consistent.
For Lift Arc Practice:
Let the machine do the work rather than forcing the timing.
Pay attention to the audio feedback from your welder when the arc establishes.
Practice moving from the start directly into your weld path without hesitation.
Focus on maintaining consistent arc length immediately after starting.
Frequently Asked Questions
What is the difference between scratch start and lift arc TIG?
Scratch start TIG involves touching the tungsten to the workpiece at full amperage and quickly lifting to establish the arc. Lift Arc brings the tungsten close at minimal amperage, then ramps to full power when lifted, which significantly reduces tungsten contamination.
Is scratch start bad for tungsten?
Yes, scratch start causes tungsten contamination because the electrode touches the workpiece at full welding amperage. This transfers small amounts of base metal to the tungsten tip, which shortens electrode life and can create weld inclusions.
Does lift arc damage tungsten?
Lift Arc causes minimal tungsten damage because contact occurs at very low amperage (typically 2-5 amps). The lack of high-current contact prevents significant contamination and extends tungsten life considerably compared to scratch start.
Can beginners use scratch start TIG?
Yes, beginners can use scratch start TIG, but it has a steeper learning curve than Lift Arc. Scratch start requires developing a light touch and proper timing. Many instructors recommend starting with scratch start to build fundamental torch control skills.
Do I need high frequency for TIG welding?
No, you do not need high frequency for TIG welding. Both scratch start and Lift Arc are non-HF starting methods that work well for most DC TIG applications. High frequency is primarily useful for AC aluminum welding or specific industrial applications.
Which TIG start method is best for beginners?
Lift Arc is generally better for beginners because it forgives timing mistakes and provides more consistent arc initiation. However, some instructors recommend learning scratch start first to develop proper torch control skills before upgrading to Lift Arc equipment.
