Is this 100% copper wire

I change one of the connections and it was copper wire.

Will this handle the old classic Lincoln buzz box?

Yes-the ends fit. I use these because they're cheap long cords for a little DC box that works 115a/250 for stuff around the house/yard but max out my welding max 110 dc amps for small jobs. These cords are only 10 gauge-I have a the fatter 6 gauge cords for the high amp jobs-the 6 gauge cords are twice as heavy and expensive.

How long can I run a machine on this? Looking to use it to connect to my pool heater (wont get wet) but ill need it to run for 30hrs

It's a good, well-made cord. You should compare cord AMP rating to your pool heater AMP rating to see if it is big enough.

is 10AWG really rated for 50A??

No. You should be using 6AWG minimum for 50A

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VEVOR Extension Cord for Portable Welders 50ft MIG TIG Plasma Welding Cord 30A Welding Extension Cord

Product ID: 569264891

Details

Brand
VEVOR
Colour
30A 50FT
Connector gender
Plug type
Type B
Voltage
250 Volts

📏50ft long reach

🔌30A heavy-duty power

🌦️Weatherproof & flexible

Description

⚡ Power your welds, wherever the sparks fly!

EXTEND YOUR WORKSPACE - 50ft length ensures you can weld far from power sources without losing efficiency or control.
POWER UP WITHOUT LIMITS - 30AMP pure copper wiring delivers stable 12500W performance for your toughest welding jobs.
BUILT TO BRAVE THE ELEMENTS - STW-rated thermoplastic cable resists wetness, sunlight, and extreme temps from -40°F to 194°F.
PLUG PLAY WITH CONFIDENCE - NEMA 6-50 3-prong plug designed for MIG, TIG, Plasma, and Lincoln welders for seamless compatibility.
PORTABLE POWER ANYTIME ANYWHERE - Lightweight yet durable design makes it easy to handle, store, and move around your shop or job site.

The VEVOR 50ft 30A welding extension cord features heavy-duty 10 AWG pure copper wiring rated for 12500W at 250V, ensuring reliable power delivery for MIG, TIG, and plasma welders. Its weatherproof STW thermoplastic jacket withstands extreme temperatures and outdoor conditions, making it perfect for long-distance welding tasks in any environment.

Specifications

ASIN	B072B92G4Y
Amperage	30 Amps
Brand	VEVOR
Case Material Type	Plastic
Color	30A 50FT
Connector Gender	Male-to-Female
Customer Reviews	4.7 4.7 out of 5 stars (1,234)
Input Current	30 Amps
Item Length	600 Inches
Manufacturer	VEVOR
Mfr Part Number	50Amp 50ft
Model Number	50Amp 50ft
Number Of Conductors	3
Number of Outlets	1
Plug Type	Type B
Power Cord Prong Count	3
UL Listed	Yes
UPC	601285879345 197988722083
Voltage	250 Volts
Wattage	7500 watts

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