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Welding questions

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eric

05-07-2003 11:10:48




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this tool talk is great. i have learned lots from many of you. especially t-bone. thanks for contributing.
i am a hobby welder, mostly on tractors, trailers, mowers and the like. i have a blue arc welder (miller maybe) and a nice new lincoln (sp 125 maybe?) mig. i enjoy welding a lot. i always use 6013 rod either 1/8 or 5/16 i think. and my mig i use argon gas with fluxless wire. i am generally pleased with what ever welding i do. my question- many people talk on here about changing polarity (like to dc or reversing the ground and electrode.) my arc welder has that ability. when do i want to do this? what is each "setting" idealy for? would someone list each possible setting and tell me when i would want to use it. how about each different common rod. would some take the time to walk me through each rods primary use? im not looking for anyone to write a book here, just looking for more useful info. speaking of books maybe thats where i should look? machinerys handbook? as always thanks for your time. eric

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RobertTX

05-08-2003 07:26:07




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 Re: welding questions in reply to eric, 05-07-2003 11:10:48  
For whatever it's worth, I use 6013 a lot and find that it works best on DCEN. Some of the older reference books recommend that also, but the flux may have improved so much that it is not that critical anymore. I believe the Lincoln text one of the other guys suggested mentions that DCEN is best. Both Lincoln and Miller/Hobart offer some excellent reference materials at very reasonable prices. check their web sites. Some of the sites are a little difficult to drill down to their books, but they are there.

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Bill 52 8n

05-07-2003 15:47:46




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 Re: welding questions in reply to eric, 05-07-2003 11:10:48  
If you want a good book, check out "The Procedure Handbook of Arc Welding" by the James F. Lincoln Arc Welding Foundation. I got a copy for class for under 20 bucks, not bad for a 2 inch thinck book. It gives descriptions of all the rods, when to use which rod. Also describes MIG, TIG, flux core, aluminum, stainless, cast iron, high/low carbon steel, joint design and minimizing distortion...pretty much everything about welding. It has a lot of info and a lot of pictures that make it easy to understand.

Bill

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Steve U.S. Alloys

05-07-2003 15:27:20




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 Re: welding questions in reply to eric, 05-07-2003 11:10:48  
While some electrodes are designed to operate on a certain polarity, there is more to polarity than flux composition. Changing the polarity determines how the heat generated by the arc is distributed. On AC polarity, 50% of the heat generated by the arc is generated in the electrode and the other half is generated in the base metal.

On DC reverse, 1/3 of the heat is placed in the base metal and 2/3rds in the electrode. DC straight is just the opposite of that.
HTH,
Steve

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T_Bone

05-07-2003 14:50:59




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 Re: welding questions in reply to eric, 05-07-2003 11:10:48  
Hi Eric,

Thank You, Glad I can help!

It's the electrode flux that first determines the best choice of welding current type. Since flux composistion is classified "top seceret" by the manufactures we can only generalize without looking up the mfg electrode recomendations.

If your using a unkown electrode mfg then you can use this "generalized" list:

Last number on the rod is flux type:
8= DCEP
O= DCEP
1= DCEN
2,3,4 or 7= AC or DC 5= DCEP (only)
6= DCRP, AC, DCEN

DCEP= DC electrode positive also called reverse polarity
DCEN= DC electrode negitive also called straight polarity


This list doesn't hold true for all electrodes. If the above list recomends DCEP and the electrode doesn't run well, try DCEN, then AC.

T_Bone

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ken

05-09-2003 11:44:44




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 Re: Re: welding questions in reply to T_Bone, 05-07-2003 14:50:59  
T-BONE IS ALWAYS SO INFORMATIVE\

WE SHOULD CALL HIM DR.T-BONE[P.O.W] [PROFESSOR OF WELDING TECHNOLOGY]



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