Question about Miller THUNDERBOLT XL 300/200 AC/DC 220V 50/60 HZ 7159592 UPS System

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Miller thunderbolt xl not striking an arc

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Posted on Jan 02, 2017

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SOURCE: I have a miller thunderbolt 225v AC arc welder

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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225Bobcat gen.runs but will not excite when trying to strike arc


#Tags bobcat 250 welder service manual

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Why does my miller bobcat welder generator not stay at an idle when swithed to low idle, insted it goes back and ... Won't strike an arc,fuses ok brushes and slip.

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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.

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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.

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1 Answer

I have miller deltaweld 302 lead stays hot all time what is th problem


Hi:

The problem could reside on the contactor, this part due to the heat and constant contact (that is the noice you hear everytime you strike an arc) sometimes it remains close. Check your owners manual and it is the numbered 21 on the part list.

Good luck

Jul 12, 2011 | Miller Electric Manufacturing Electric...

1 Answer

My bobcat 225g runs full bore all the time, I thought it would idle then when you strike an arc it would pick up speed,


A welder does not speed up when an arc is struck. It is normal for a gas welder to stay at a high rpm. If it did not, it would be very hard on the machine as a high amperage is needed to start an arc for welding, and to be consistant. Unlike a generator which will "idle down" when not in use.

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My miller sychrowave tig welder is not blowing sheilding gas when it strikes an arc. The gas is on at the tank. I can hear what sounds like gas or a valve opening when I press the foot control, but my...


Remove the tig torch twist lock from the front of the machine. Step on the pedal as if you were striking an arc and gas should flow out of the twist lock port. If gas comes out of the port, your torch probably has a valve built in (many do) often this is a sleeve on the torch body which you rotate but may not be obvious.
If no gas out of port then its the solenoid or regulator.
You do have the machine in TIG mode and not stick?

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1 Answer

I have a miller 90 amp firefly xl when i'm


  • You can try changing the tip,
  • keeping your arc length shorter - closer to the weldment.
  • if your machine has a burn back function, set that to the correct setting, it may be set to something by default,or have moved (not available on all machines).
  • check your ground clamp - make sure it is clean and securely connected.

Apr 19, 2010 | Welding Tools

1 Answer

I have a miller thunderbolt 225v AC arc welder


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.

Jan 24, 2010 | Miller THUNDERBOLT XL 225 AC 230V 50/60 HZ...

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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