How to TIG Weld: Steps, Settings & Tips

Learning how to TIG weld is the biggest jump in control you can make as a welder. The process is slower and fussier than MIG, but it lays down the cleanest, most precise beads of any method, which is why it wins the jobs where the weld actually shows.

It is also the toughest process to pick up. You steer the torch with one hand, feed filler with the other, and ride the amperage with a foot pedal, all at the same time. Expect a learning curve, and if you can grab an hour of hands-on time with an experienced welder, take it.

This guide walks you through the whole process, from picking a tungsten to laying your first bead, plus the settings and clean-up habits that separate a solid weld from a black, porous mess.

What Is TIG Welding?

TIG stands for Tungsten Inert Gas, though the technical name is Gas Tungsten Arc Welding (GTAW). It is a process that uses a non-consumable tungsten electrode to deliver the current to the welding arc.

TIG is a method of welding best suited for precision work. It handles awkward angles, curves, and thin gauge materials better than almost any other process. It is also the go-to method for exotic metals and can join dissimilar metals together effectively.

While it is slower than MIG, TIG welding is superior for thin sections of mild and stainless steel, as well as non-ferrous metals like aluminum, magnesium, and copper alloys.

How Does TIG Welding Work?

TIG welding uses extreme heat generated by an electrical arc. This arc jumps from the tungsten electrode in your torch to the metal surface you intend to weld. Typically, temperatures can reach up to 11,000 degrees Fahrenheit.

A constant power supply creates this arc, which is conducted through a column of ionized gas and vapors. Unlike MIG welding, the electrode does not melt into the weld. Instead, you feed a separate filler rod into the pool with your other hand. The area is protected from oxidation and contamination by an inert shielding gas, usually Argon.

Creating a good TIG weld requires coordination. The color of the weld should match the base metal, and the bead should be consistent in width and height. You must keep the torch at an even distance from the surface to ensure a smooth outcome. Aim for a tight arc gap of about 0.125 inches (1/8 inch) for the best control.

What You Need

Welding involves high heat, electricity, and UV radiation. You must prioritize safety before touching the machine.

• Auto-darkening welding helmet (essential for TIG precision).
• TIG welding gloves (thinner leather for dexterity).
• Welding respirator (important for confined spaces).
• Fume extractor.
• Fire-resistant weld jacket (cotton or leather).
• Weld sleeves.
• Leather work boots.

To get the job done, you will need the following equipment:

• TIG welding machine.
• Argon gas cylinder (100% Argon).
• Tungsten electrodes.
• Filler metal rods (matched to your base metal).
• Gas regulator and hose.
• Ground clamp.
• Foot pedal (for amperage control).

How To TIG Weld

Here is a basic guide to using the TIG welding method. For this walkthrough, we will focus on welding 6061 aluminum, as it is a common TIG application.

1. Select the Electrode

For aluminum, you traditionally use a pure tungsten rod (Green). However, modern inverter machines often work better with Lanthanated (Blue or Gold) tungsten, which works on both steel and aluminum. Check your machine’s manual for the best recommendation.

2. Grind the Electrode

Brand new rods have flat tips and need shaping. For welding steel (DC), you grind the tungsten to a sharp pencil point. For aluminum (AC), you typically want a slightly balled tip, or a truncated point if you are using a modern inverter machine.

Always grind your tungsten lengthwise (parallel to the rod), never sideways, so the grind lines run down the point and keep the arc stable. For DC work, a taper about 2.5 times the electrode diameter is a good rule of thumb.

3. Insert the Electrode Into the Torch

Loosen the back cap of the torch and slide the tungsten in. The tip should stick out roughly 0.25 inches (a quarter inch) from the ceramic cup. Tighten the back cap to lock it in place.

4. Choose the Right Settings

You will typically see two main polarity options on a TIG unit. Select AC (Alternating Current) for welding aluminum. If you were welding steel or stainless, you would use DCEN (Direct Current Electrode Negative).

Set your amperage based on the metal thickness; a general rule is 1 amp per 0.001 inch of thickness. Set the “Post-Flow” (gas timer) to about 5 seconds. This keeps the gas flowing after you stop welding to protect the cooling tungsten and puddle from oxidizing.

On AC for aluminum, two extra dials matter. AC balance sets how much of each cycle cleans versus penetrates; start near 70 percent electrode-negative for solid penetration with a narrow cleaning band. AC frequency tightens the arc, and 70 to 100 Hz is a friendly starting point, with a push toward 120 Hz focusing the cone for tight corners. Leave both near the middle of their range until you can read the puddle.

5. Turn the Gas On

Open the valve on your main gas cylinder. For TIG, you almost always use 100% Argon. Helium mixes are rare and usually reserved for very thick industrial applications.

Set your regulator to read between 15 and 25 CFH (Cubic Feet per Hour). If the flow is too low, your weld will turn black and porous. If it is too high, turbulence can pull air into the weld.

6. Prepare the Workpiece

TIG welding requires surgical cleanliness. Use a stainless steel wire brush (dedicated only to aluminum) to remove the oxide layer. Wipe the metal down with acetone to remove any oils or grease.

Clamp the metal to your table to prevent warping. Attach your ground clamp directly to the workpiece or the metal table. Ensure the connection point is clean bare metal.

7. Suit Up

TIG welding produces intense UV light that can cause “arc eye” and skin burns very quickly. Put on your helmet, jacket, and gloves. Ensure no skin is exposed. Since TIG is quiet and doesn’t spark much, it is easy to forget how dangerous the light is, keep covered.

8. Get Comfortable

Do a “dry run” before you light the arc. Move your hand along the path of the weld to ensure you can reach the end without getting tangled in the cable or blocking your view. Good body positioning is half the battle.

9. Initiate the Arc

Hold the electrode about 1/8 inch away from the metal. Do not touch it. Press the foot pedal gently to start the gas and the arc. You will see the cleaning action of the AC current (little white spots) stripping the oxide off the aluminum.

Increase the pedal pressure until a shiny, fluid puddle forms. This is your weld pool.

10. Establish the Puddle

Once the puddle forms, ease off the pedal slightly to maintain size without melting through. Aluminum conducts heat fast, so you need to be aggressive with heat at the start and then back off as the metal soaks up the temperature.

11. Add Filler and Move

With the puddle established, use your other hand to “dip” the filler rod into the leading edge of the puddle. Dip, then pull the rod back slightly. Move the torch forward a tiny amount, and dip again.

This rhythm, move, dip, move, dip, creates the “stack of dimes” look. Keep the rod inside the gas shield zone even when you aren’t dipping it to prevent it from contaminating.

12. Types of Weld

The easiest joint to practice is the “bead on plate,” just running lines on a flat piece of metal. Once confident, move to a “fillet” weld (T-joint) or a “butt” weld (two flat pieces edge-to-edge).

13. Power Off

When you reach the end of the weld, slowly let off the foot pedal. Do not snap it off instantly; tapering the amperage down prevents a “crater” or hole from forming at the end of the weld. Keep the torch in place for a few seconds to let the post-flow gas cool the weld.

TIG Welding Safety

Welding is rewarding but inherently risky. Adopting these best practices keeps you safe.

Check Your Connections

Before striking an arc, inspect your cables. A loose connection causes resistance, heat build-up, and poor arc quality. Tighten your ground clamp and torch leads.

Fire Safety

Clear the area of cardboard, oily rags, or sawdust. TIG doesn’t throw sparks like stick welding, but hot globules of filler metal can drop. Keep a fire extinguisher rated for electrical and metal fires nearby.

Electrical Hazards

Never weld in wet conditions or with wet gloves. You are part of an electrical circuit, and water lowers resistance, increasing shock risk. Keep hydration separate from your workstation.

Ventilation Matters

While TIG is cleaner than MIG welding, ozone and metal fumes are still generated. Aluminum welding creates ozone, and stainless steel can release hexavalent chromium. Always keep your head out of the plume and use a respirator or shop ventilation.

Top Tips for TIG Welding

Clean Everything Twice

We cannot stress this enough: TIG creates weak, porous welds if the metal is dirty. If you think it is clean, wipe it with acetone one more time. The same goes for your filler rod; wipe it down before use.

Watch Your Torch Angle

Keep your torch angled about 15 to 20 degrees away from the direction of travel (pushing). If you angle it too much, you lose gas coverage and heat focus. If you hold it perfectly straight, it is hard to see the puddle.

Get Comfortable

TIG requires fine motor skills. Prop your wrist or forearm on the table or a support bar to stabilize your hand. You cannot create a steady bead if your hand is shaking in the air.

Grind Tungsten Correctly

Always grind your tungsten vertically so the grind marks run the length of the point. If you grind sideways (creating rings), the arc will wander and become unstable.

Rescue a Contaminated Tungsten

If you dip the electrode into the puddle or graze it with the filler rod, the arc turns hissy and wanders and the weld dirties instantly. Stop and re-grind the tungsten past the contaminated tip. You cannot burn the impurities off by cranking the amperage; that only spreads them. Keeping the tip 2 to 5 millimeters off the pool is the habit that prevents most dips in the first place.

Upgrade to a Gas Lens

A standard collet body works, but swapping in a gas lens, a mesh screen that smooths the argon into steadier laminar flow, gives noticeably better coverage and lets you stick the tungsten out farther to see the puddle. It is one of the cheapest changes that visibly cleans up a beginner’s welds.

FAQs

Is TIG Stronger Than MIG?

It depends on the application, but TIG welds are generally considered higher quality. Because you have precise control over the heat input and filler amount, TIG welds are often cleaner and free of defects, making them the standard for critical aerospace and automotive structural work.

Do You Push or Pull TIG Welding?

You should almost always use the push method for TIG welding. This means tilting the torch slightly back and moving it forward. Pushing gives you a better view of the puddle and ensures the gas shield protects the area you are about to weld.

Can You TIG Weld Without Gas?

No, TIG welding is impossible without shielding gas. The “IG” stands for Inert Gas. Without Argon to displace the oxygen, the tungsten electrode will burn up instantly, and the metal will foam up with porosity.

How Do You Add Filler to TIG Welding?

You add filler by “dipping” or “dabbing” the rod into the leading edge of the weld pool. Do not hold the rod in the fire continuously. Dip it in to add metal, then pull it back slightly (but keep it inside the gas shield) to prevent it from melting prematurely.

Why Are My TIG Welds Black?

Black, sooty TIG welds mean the weld oxidized because shielding gas failed to cover it. The usual causes are argon flow set too low (aim for 15 to 25 CFH), a draft or fan blowing the gas off the pool, or snatching the torch away before the post-flow finishes. Keep post-flow running at least 5 seconds, block any breeze, and a gas lens will steady the coverage.

Is TIG Welding Easy to Learn?

TIG is generally considered the hardest welding process to learn. It requires using both hands and one foot simultaneously. However, with patience and practice, anyone can learn it. Once mastered, it offers the most control of any welding type.

Is TIG Welding as Strong as Stick?

Yes, TIG welding is often stronger than Stick welding because it is cleaner. Stick welding relies on flux, which can sometimes get trapped inside the weld (slag inclusions), weakening it. TIG uses pure gas and metal, resulting in a dense, pure weld deposit.

Can I TIG Weld Without Gloves?

Absolutely not. Even though TIG doesn’t spark much, it emits massive amounts of UV radiation, more than other processes. Welding without gloves will give you the equivalent of a severe sunburn in minutes and increases the risk of skin cancer.

What Is the Hardest Metal to TIG Weld?

Titanium is often cited as the hardest because it requires perfect shielding. It reacts instantly to oxygen, so you need a “trailing shield” or a purge chamber to keep the back and front of the weld covered in argon until it cools completely.

What Metals Cannot Be TIG Welded?

You generally cannot TIG weld metals with very low melting points, such as lead or zinc. Cast iron is also notoriously difficult to TIG weld due to its high carbon content, which causes cracking; stick welding or oxy-acetylene brazing is usually preferred for cast iron repairs.

Why Does My Tungsten Keep Melting?

A tungsten that melts or balls up is almost always a polarity problem, so use DCEN (electrode negative) for steel and stainless. On DCEP (electrode positive) the heat concentrates on the torch instead of the metal and cooks the tip. Too much amperage for the electrode diameter, or a tungsten already fouled from dipping, will do it too, so regrind past any contamination before you blame the machine.

What AC Settings Should I Use for Aluminum?

Start aluminum near 70 percent AC balance (electrode negative) and 70 to 100 Hz frequency, then adjust from what the puddle tells you. More electrode-negative balance drives penetration and leaves a narrower cleaning band, while higher frequency tightens the arc cone for corners and thin edges. Set amperage around 1 amp per 0.001 inch of thickness and run 100 percent argon.

It’s All About the TIG

TIG welding takes patience. It might be tougher to pick up than MIG welding, but the payoff is worth the effort. Once you master the “stack of dimes,” you can weld everything from bicycle frames to aircraft parts with pride.

Get your safety gear sorted, clean your metal until it shines, and start practicing your beads. The control you get with TIG is unmatched.