Question about Miller THUNDERBOLT XL 225 AC 230V 50/60 HZ 715959208512 UPS System

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I have a miller thunderbolt 225v AC arc welder

HOPEFULLY THIS DOES'NT SOUND LIKE TO DUMB OF A QUESTION, THIS MILLER THUNDERBOLT THAT I CAME ACROSS HAS A CUT POWER CORD. I HAVE A NEW PLUG FOR IT BUT I DONT KNOW WHICH WIRE GOES WHERE. THE THREE SPOTS ARE MARKED X Y AND THE THIRD IS BLANK?

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Fred Yearian

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The blank should be the grouDING conductor (green) and they may have a green screw to further indicate it.

Since the welder runs on 220, either of the hot wires can go to either of the other terminals (X or Y).. Those wires might be black, red, blue, brown.

There is a slight chance it would be white even though it is hot on the portable cord because some portable cord is used that way.

VERIFY the receptacle you connect to is wired correctely before connecting your unit to it.

Posted on Jan 24, 2010

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If I turn the ac dc switch while what dose it do to the wielder. Now im not getting any juice to wield .thank you


Changes between AC and DC voltage at the electrodes.



Q: What Type Of Stick Welder Works Best For All-Around Use?

A: A welder with an AC/DC output, whether its an electric arc machine like Miller\'s Thunderbolt or a gas engine drive like Miller\'s Bobcat.

DC welding offers advantages over AC for most Stick applications, including: easier starts; fewer arc outages and sticking; less spatter/better looking welds; easier vertical up and overhead welding; easier to learn "how to weld" and a smoother arc. DC reverse polarity (electrode positive) provides about 10 percent more penetration at a given amperage than AC, while DC straight polarity (electrode negative) welds thinner metals better.

Q: Does An AC Output Have Any Advantages?

A: Yes, if you need to weld on material that\'s become magnetized from friction, such as when hay, feed or water constantly rub against a steel part. A DC output won\'t work because of "arc blow," where the magnetic field blows the molten filler metal out of the weld puddle. Because an AC output alternates between polarities, it enables you to weld magnetized parts.

Aug 19, 2014 | Computers & Internet

1 Answer

What are some good things to look for when purchasing an used thunderbolt ac/dc cc stick welder


cc 230 isnt a bad welder. If it will be used for industrial purposes than i would go with a 440.

May 19, 2014 | Miller Welding Tools

1 Answer

I need parts for miller thunderbolt XML stick welder#903642 were can I find them?


try you local welding/metal fabrication store. not sure where your located but pretty sure Oxarc will have what you need

Apr 12, 2013 | Miller Welding Tools

1 Answer

I have a older Miller stick welder. It is a thunderbolt HH 1B . There are three plugins High, low, and work. Which one is for the ground to metal?


The one labeled "work" is for the 'ground' clamp - to the metal.

"high" will give you the higher amerages on the dial, while "low" will give you the lower amperages.

Jun 14, 2011 | Miller Welding Tools

1 Answer

Changing from 480v 3 phase to 220v single phase need diagram on a Miller Dynasty DX tig welder Serial # KH577649 stock 903519-01-1


i have a old miller thunderbolt CC*AC/DC welder its wire single phase 480 can it be switched to 220 single phase

Dec 02, 2009 | Miller Welding Tools

1 Answer

225 thunderball,has no plug cord,need to know where to hook incoming cord inside welder


The following link will provide you with information about a 225 thunderbolt. We have serviced many Miller welders over the years and find them to be very reliable. Good luck with your project.
http://www.millerwelds.com/om/o316g_mil.pdf

Jun 20, 2009 | Miller Welding Tools

1 Answer

Arcing before pulling the trigger


does this unit have a high side and a low side if it does plug it into the low side and try it.

May 27, 2009 | Miller Welding Tools

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