Your First MIG Weld: Practice Project 

Reading about welding and actually welding are two different things. At some point you have to put the gun in your hand and strike an arc. This project is designed to be that moment — low stakes, structured, and focused entirely on building the fundamentals.

No finished product required here. No joints to fit up, no dimensions to hit. Just flat plate, a MIG welder, and the specific skills that everything else in welding builds on.

Although my first time welding was in high school, I still remember the sparks jumping off the arc like it was yesterday. It was a bit scary at first — there was a lot happening, and it was hard to look at everything that I needed in order to ensure a proper bead. But that quickly went away, and everything slowed down, even though the machine settings didn’t change.

Why Flat Plate First

Flat plate on a flat table is the simplest possible welding scenario. No joint geometry to worry about, no fitup, no vertical or overhead position challenges. You can focus entirely on the three fundamentals: gun angle, travel speed, and stickout.

Professional welders practice on flat plate when they’re learning a new machine or a new wire. It’s not a beginner-only exercise — it’s the fastest way to develop feel for what the machine is doing.

Once you can run a straight, consistent bead on flat plate, every other position and joint type is a variation on that foundation.

Before You Strike an Arc

Set your machine using the door chart for 1/8” steel with 0.035” wire. This is your starting point — you’ll probably adjust from there, and that’s fine. Run a test bead on scrap before you start the practice sequence.

• Confirm gas is flowing (15–20 CFH)
• Ground clamp on clean bare metal, close to the work
• Wire stickout approximately 3/8” to 1/2” past the contact tip
• Plate sitting flat and stable — clamp it down if needed
• PPE on: hood, gloves, jacket, boots

The Practice Sequence

Work through these exercises in order. Each one builds on the last. Use a fresh piece of plate or move to a clean area between exercises so you’re reading the bead without other welds in the way.

Exercise 1: Straight Stringer Beads

A stringer bead is a straight, narrow bead with no side-to-side weave. It’s the foundation of everything.

Set up:

• Mark a straight line on your plate with a soapstone or marker
• Position the gun at a 10–15 degree push angle (gun tilted slightly forward in the direction of travel)
• Hold the contact tip 3/8”–1/2” from the plate

Run the bead:

1. Lower your hood, get comfortable, and find your starting position before pressing the trigger
2. Press the trigger and pause briefly at the start — let the puddle establish before moving
3. Move at a steady pace following your marked line — smooth and consistent
4. Release trigger at the end; hold the gun in position briefly to let gas shield the crater

What you’re looking for: a bead that’s the same width from start to finish, with consistent ripple pattern. If it narrows at the end, you sped up. If it’s wider in the middle, you slowed down.

Run 4–6 stringer beads. By the third one, you should be noticing your speed consistency improving.

Exercise 2: Adjust and Compare

Now you’re going to intentionally run bad beads so you can see what the controls actually do. This exercise is worth more than most people think.

Run each of the following, labeling the plate with soapstone after each one:

• Voltage 2 steps lower than your baseline — note the bead height and appearance
• Voltage 2 steps higher — note the flattening and potential undercut
• Wire speed 20% slower — note what happens to the arc sound and puddle
• Wire speed 20% faster — note the stubbing or buildup
• Travel speed too fast — move at roughly double your normal pace
• Travel speed too slow — move at half pace, watch for burn-through risk

After running all six, go back to your baseline settings and run a clean stringer. You’ll feel the difference immediately. More importantly, you’ll have a visual reference for what off-settings look like — so you can diagnose problems in real welds later.

Exercise 3: Starts and Stops

In real welding, you rarely run one continuous bead. You stop, reposition, restart. How you start and stop affects weld quality.

Common problems:

Cold starts: pressing the trigger at the very beginning of a new bead area on cold metal often creates a stubby, poor-looking start. Solution: start slightly ahead of where you want the bead to begin, then move back.

Crater cracks: stopping abruptly leaves a crater at the end of the bead that can crack as it cools. Solution: pause briefly at the end before releasing the trigger, or back-step the last 1/4” of the bead. Some machines have a crater fill setting.

Practice starting and stopping cleanly across a full plate — aim for 8–10 start/stop pairs. Focus on getting a clean tie-in between where you stopped and where you restart.

Exercise 4: Weave Beads (Introduction)

A weave bead moves side to side as you travel, depositing a wider bead than a stringer. It’s used to fill wider gaps and build up material.

The basic weave: move the gun in a small side-to-side C or Z pattern as you travel. The width of the weave shouldn’t exceed 3 times the wire diameter — for 0.035” wire, keep the weave under about 1/8” wide. 0.035” wire deposits a slightly wider bead than thinner wire, which works in your favor here, but resist the urge to go wider. Past that and you risk cold laps (unfused edges) and porosity.

Run 3–4 weave beads. You’re not trying to master this — just introduce the motion and feel how the puddle responds to the side-to-side movement.

How to Read What You Welded

After each exercise, take your hood off and actually look at the beads. Here’s a quick reference:

What ‘Good’ Looks Like at This Stage

Beginners often have unrealistic expectations for what their first welds should look like. Here’s an honest calibration:

• Your first session: inconsistent width, some porosity, questionable starts and stops. Normal.
• After 3–4 sessions: bead width becoming more consistent, sound dialed in, starts improving
• After 8–10 sessions: stringer beads looking clean and repeatable, able to adjust settings purposefully

The goal at the end of this exercise is not perfection. It’s familiarity — with how the machine sounds, how the puddle moves, and how the controls respond. Everything else builds from that.

The real aha moment for me came when I was able to stop looking at the bright light (the arc) and actually start watching the puddle. I could see the sides wet out into the base metal. Once I got there, I really noticed the sound. It was very uniform. If I reduced my stickout, I could hear the weld speed up — and the reverse when I increased it. 

Where to Go Next

Once your flat plate stringers are consistent, you’re ready for joints. A lap joint (two pieces overlapped) or a T-joint (two pieces at 90 degrees) are the natural next steps — they’re the most common joint types in real fabrication and introduce the concept of welding in a corner rather than on an open surface.