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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.
check your themostat fan mode switch to see if it in on or auto. It should be in auto. If this does not stop indoor fan motor, (it may take up to 2 minutes for the fan to stop, preprogrammed shutoff in the thermostat and fan control cards may make you think the fan has not stopped ) If this does not stop the fan the fan control board in your air handler has a green wire shorting to 24 volt signal in the theromostat wire or the contact on the blower control card is stuck and will need replaced.
IT is common for the batteries to arc when connectiong the last one up. On a side note if it is arcing enough to weld the cable to teh battery you have something wrong, but it you get a slight arc when connecting them, than that is ok.
the unit will need to go in for service there is a control bord issue there 4 in the unit these boards have to be tested by Lincoln i have the same welder and what they will do is swap out the boards till the bad one found if the unit is not under warranty they can be expensive mine coast 500.00 for the 1 control board there is not a clear way to say it is a particular one do to there all inter linked as to functions. go to the web site and search for a service center in your area hope this helps
Is this on new rods as well as one's you'be been already welding with? Depending on rod types, some will "flux over" the end, after welding insulating the tip. When you're welding at a low setting, with a small rod, sometimes it is hard to start an arc. A 7018 rod is a good example of this. Strike the rod like a woodden match, or drag it on the metal, to expose the rod. It also depends on your welder. Some have settings to help start an arc and then control the current. Older transformer welders arn't that smart and are less forgiving on low current thin metal settings.
Maybe you can get lucky like I did . Some times the acr volt selector switch gets corrosion in it and wont let the circuit board know to send power to the wire feed motor. You can cycle this arc volt. switch in my case it is the a,b,c,d,e, switch back and fourth a few times and this will brake the corrosion and your wire might feed again as mine did . This corrosion build up happens from not using and or sollecting the switch much usually on a welder at hm that gets very little use. it is common good luck .