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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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.
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