Parts 1 and 2 of this series covered the physics and the cut test data. This one starts where most welders actually start: with a problem they can’t explain.
The Symptoms Welders Are Actually Searching For
- “Why is my welding lead getting hot after 10 minutes?”
- “My welding ground clamp is getting hot — is that normal?”
- “Welding ground clamp melting — what’s wrong?”
- “MIG welder loses power after a few minutes”
- “Welder arc feels weak even with correct settings”
- “Welding cable overheating — machine keeps shutting down”
“CCA vs copper” is the answer — not the question. Most welders don’t know they have a CCA problem until someone in the thread tells them to cut open the lead.
What to Check When Your Welding Lead Gets Hot
Lincoln Electric’s technical guide on selecting the proper size welding cables identifies the variables that determine welding circuit resistance and heat buildup:
- Output current — A cable rated for 150A will overheat at 200A sustained.
- Total circuit length — Lincoln specifies total loop length: electrode lead + work lead combined.
- Duty cycle — Cable sizing must account for actual sustained use, not just peak amperage.
- Allowable voltage drop — Excessive resistance causes voltage drop at the arc, affecting bead quality.
- Conductor material — At the same cross-section, CCA carries approximately 64% more resistance than pure copper.
- Clamp contact area and termination quality — Worn clamps, loose crimps, and corroded connections create localized high-resistance points independently of cable material.
“The proper cable size depends on the amperage, the total length of the welding circuit, and the duty cycle of the welding application.”
— Lincoln Electric — Selecting the Proper Size Welding Cables
Reddit: What r/Welding Actually Discusses
- Users who cut open a damaged lead and found CCA — often after the lead had already overheated or melted. The visual confirmation consistently generates significant thread engagement.
- Users building ground leads with 0-gauge CCA who report difficulty striking an arc — with community responses pointing to undersized conductor cross-section as the likely cause.
- Users who replaced a budget ground clamp and lead and reported improved arc stability — with the community noting that clamp contact area, termination quality, and conductor size all contribute independently of material.
- Users asking whether replacement lead costs exceed the machine’s value — a common outcome when budget welders ship with undersized CCA leads that fail under sustained use.
Find current discussions: search site:reddit.com/r/Welding "welding leads getting hot" or site:reddit.com/r/Welding "ground clamp melting" in Google.
YouTube: The Format That Makes Brands Respond
The cut test format that generates the most community trust combines sustained load testing, infrared temperature measurement, physical cross-section comparison, and on-camera brand results. When amcustomfab published this combination — with ArcCaptain’s official account responding publicly — it set the standard for what the welding community now expects from any brand making cable quality claims.
▶️ See the full temperature data and test breakdown in Part 2 →
Instagram: Where the Community Reacts in Real Time
📹 amcustomfab’s original cut test reel — cross-section comparison, infrared temperature data, and ArcCaptain’s official response in the comments.
101 likes · 19 comments · April 14, 2026 · @amcustomfab
Facebook: Fault Reports and Upgrade Questions
Facebook welding groups surface direct fault reporting: ground clamp insulation softening or melting within minutes of sustained welding, heat buildup at the terminal crimp or clamp attachment point, and users replacing stock clamps with heavier brass alternatives. These discussions point to termination quality and clamp contact area as contributing factors independent of conductor material.
What the Pattern Shows Across Platforms
| Platform | How the Problem Is Framed | What the Community Finds |
|---|---|---|
| Reddit r/Welding | Hot cables, melting clamps, weak arc | CCA + undersized gauge + poor termination |
| YouTube | Cut tests, temperature tests, voltage drop tests | Visual CCA confirmation; brands respond to public data |
| Cross-section photos, infrared readings, burn tests | ArcCaptain officially acknowledged CCA issue | |
| Facebook Groups | Fault reports, clamp melting, upgrade questions | Termination and clamp contact as contributing factors |
ARCPEX’s Position
ARCPEX chose 100% copper for the 10FT ground-clamp lead and 10FT electrode-holder lead included with the MIG200 as standard equipment. At the same cross-section, copper provides approximately 64% lower resistance than CCA — less voltage drop, less energy converted to heat, more consistent arc voltage.
Frequently Asked Questions
Why is my welding lead getting hot after 10 minutes?
Check conductor size, material (CCA vs copper), connection points, clamp contact area, and internal strand condition. Any of these can contribute — often in combination. Undersized cable is the most common cause; CCA at the same gauge as copper adds approximately 64% more resistance on top of that.
Should I upgrade my ground clamp and lead?
If your leads run hot under sustained load, yes — but also check clamp contact area and termination quality, which affect resistance independently of conductor material. A worn clamp or loose crimp can cause heat buildup even with pure copper cable.
Are the leads on budget welders actually copper?
Often no. Cut a cross-section of a damaged lead to verify. Pure copper is uniformly orange-red; CCA shows a silver aluminum core. See Part 2 for the full cut test results →
What is the resistance difference between CCA and pure copper welding cable?
At the same conductor cross-section and length, CCA (approximately 61% IACS) carries approximately 64% more resistance than pure copper (approximately 100% IACS). This means more voltage drop across the cable and more energy converted to heat rather than delivered to the arc.
How do I know if my welding leads are copper or aluminum?
Cut a cross-section of a damaged or retired lead. The difference is immediately visible to the naked eye — pure copper is uniformly orange-red throughout; CCA shows a silver aluminum core with only a thin copper surface coating.
Ready to weld with leads that don’t fight you?
ARCPEX MIG200 — 10FT 100% pure copper ground-clamp & electrode-holder leads, standard on every unit.
Shop ARCPEX MIG200 →← Part 1: Pure Copper vs Aluminum Welding Leads — Cut Test Results
← Part 2: Cut Test Temperature Data — CCA Hits 300°F in 6 Minutes
