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<title>Read the Weld — Anthony Large</title> <title>Read the Weld — Anthony Large · Field guide to reading a MIG weld</title>
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<meta property="og:description" content="Thirty-one seconds, narrated, on my 4ort.mov channel."> <meta property="og:description" content="A narrated film and field guide on reading a MIG weld: the feel test, heat-color tells, and tying in the toes. By Iowa welder Anthony Large.">
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<a href="https://anthony-large.4ort.net/films/read-the-weld">WATCH &nbsp;▶&nbsp; READ THE WELD</a> <a href="https://anthony-large.4ort.net/films/read-the-weld">WATCH &nbsp;▶&nbsp; READ THE WELD</a>
</div> </div>
<figure>
<img class="hero" src="https://images.pexels.com/photos/15056622/pexels-photo-15056622.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
alt="Close-up of a weld bead under the blue arc"/>
<figcaption>A bead under the arc. Close read the ripple and the color — that's the whole story.</figcaption>
</figure>
<p>Every bead is a sentence, and the machine writes clean if you hand it a clean page. Most guys chase dials — amps, wire speed, voltage. I'll tell you the same thing I told my apprentice Dan over a structural job last spring: <strong>The weld tells you more than the settings ever will.</strong> Read the bead and you're reading the truth.</p> <p>Every bead is a sentence, and the machine writes clean if you hand it a clean page. Most guys chase dials — amps, wire speed, voltage. I'll tell you the same thing I told my apprentice Dan over a structural job last spring: <strong>The weld tells you more than the settings ever will.</strong> Read the bead and you're reading the truth.</p>
<div class="rule"></div> <div class="rule"></div>
<h2>1. The Feel Test</h2> <h2>1. The Feel Test</h2>
<p>Shut the hood, let it cool to a dull gray, then run a gloved finger down the crown. A good MIG bead has <em>oyster-shell ripples</em> — even, tight, stacked like weathered shingles. Too flat and glassy means you were cold and fast; the toes never tied in. Too gutted — a valley down the middle — and you've got a cold-lap pocket waiting to crack. The ripple is the metal settling as the puddle freezes, and it always tells the truth about travel speed.</p> <p>Shut the hood, let it cool to a dull gray, then run a gloved finger down the crown. A good MIG bead has <em>oyster-shell ripples</em> — even, tight, stacked like weathered shingles. Too flat and glassy means you were cold and fast; the toes never tied in. Too gutted — a valley down the middle — and you've got a cold-lap pocket waiting to crack. The ripple is the metal settling as the puddle freezes, and it always tells the truth about travel speed.</p>
<div class="narrow">Speed sings. Ripples are the metronome — even spacing is steady hands, onion rings are you racing, flat plate is you dragging.</p> <div class="narrow">Speed sings. Ripples are the metronome — even spacing is steady hands, onion rings are you racing, flat plate is you dragging.</div>
<h2>2. Color Is the Lie Detector</h2> <h2>2. Color Is the Lie Detector</h2>
<p>The heat-affected zone reads off in temper colors, exactly like a blacksmith's blade. Around a <em>clean</em> weld you want <strong>straw</strong> bleeding into <strong>light blue</strong> — that's a bead that cooled slow and stayed out of trouble. Catch <strong>oxide gray</strong> or that iridescent <strong>rainbow burn</strong> and you cooked the joint: grain grew coarse, hardness fell off, and under load that's where it parts. Chromoly and stainless get pickier than mild — one shade past straw and you've burned the corrosion resistance out of the tube.</p> <p>The heat-affected zone reads off in temper colors, exactly like a blacksmith's blade. Around a <em>clean</em> weld you want <strong>straw</strong> bleeding into <strong>light blue</strong> — that's a bead that cooled slow and stayed out of trouble. Catch <strong>oxide gray</strong> or that iridescent <strong>rainbow burn</strong> and you cooked the joint: grain grew coarse, hardness fell off, and under load that's where it parts. Chromoly and stainless get pickier than mild — one shade past straw and you've burned the corrosion resistance out of the tube.</p>
<div class="narrow">Over-spec is a habit, not a virtue. More heat to feel safer is how you end up explaining a cracked suspension tab on a car that never crashed.</p> <div class="narrow">Over-spec is a habit, not a virtue. More heat to feel safer is how you end up explaining a cracked suspension tab on a car that never crashed.</div>
<h2>3. Tie In The Toes</h2> <h2>3. Tie In The Toes</h2>
<p>The two lines where the weld meets the base metal — the toes — are where every joint lives or dies. Feather the toe into the parent plate, no sharp notch, no undercut. Then tie each pass into the previous one's crown, overlapping about a third. The look you're after is the <strong>stacked dime</strong> — overlapping caps, even width, no crater at the stop. That crater's a stress raiser; a crater crack will find you at three in the morning after the part goes in.</p> <p>The two lines where the weld meets the base metal — the toes — are where every joint lives or dies. Feather the toe into the parent plate, no sharp notch, no undercut. Then tie each pass into the previous one's crown, overlapping about a third. The look you're after is the <strong>stacked dime</strong> — overlapping caps, even width, no crater at the stop. That crater's a stress raiser; a crater crack will find you at three in the morning after the part goes in.</p>