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6011 root pass followed by 7018 ??

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Scud

03-05-2001 16:11:05




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Someone tell me if this is correct. I have been welding regular steel by running a root pass with 6011 and following up with a burn out of 7018. I have been using regular Hobart rods. I am running these on a lincoln 225 ac/dc machine and since I have been welding no more than 3/8 inch metal have had no problem in the dc negative mode on both rods ( USING HEAD RANGE OF 90-95). My question is this, one day I know I will encounter 1/2 in metal and will really have to turn up the amps. Does anyone know of a good ac 6011 and 7018 rod this increase in amps. A recomendation from one of you professionals would be apreciated. Or any recomendation different from what I am doing.

Scud

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Paul

03-10-2001 08:20:39




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 Re: 6011 root pass followed by 7018 ?? in reply to Scud, 03-05-2001 16:11:05  
I think I remember from welding classes that a general rule for amperage setting for any rod is the decimal equivilent of the rod size. A 1/4" rod would equal .250", therefore amperage setting would be 250 amps. A 1/8" rod equals .125", therefore 125 amps. This should get you started, and if you feel it's too hot or too cold, make adjustments until you're comfortable. You can also adjust your travel speed.

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T_Bone

03-05-2001 21:56:23




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 Re: 6011 root pass followed by 7018 ?? in reply to Scud, 03-05-2001 16:11:05  
Hi Scud, Well I don't know how professional I am but here goes.

You didn't say what diameter rod you were using but if 1/8" your amps are pretty cold. Try holding a shorter arc length and increasing the amps on DCEP (reverse) for 7018 about 125a for both. 6011 does run well on DCEN (straight)expessically on galvanized.

6010 is a excellant suggestion. You might what to try Lincoln 6010(P5) in DCEP and Chemtron 7018 DCEP. As the others stated the rods work very well.

Also as suggested it doesn't matter how thick you weld with a electrode, either a stringer or weave bead and both rods are good for all positions upto any thickness. Besure and clean inbetween passes really well.

Base metal prep is a must. Clean 1" of either side of center line to bear metal, v-notch with a 3/32" land and 3/32" plate gap and tack at least 3 places for a 6" long plate or more depending on the length of joint. Tacks are spaced every 6" on 3/8" plate.

T_Bone

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Nathan(GA)

03-05-2001 20:29:39




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 Re: 6011 root pass followed by 7018 ?? in reply to Scud, 03-05-2001 16:11:05  
Back when I was a pipe welder, we used a 1/8 6010(5P) for the root and a 3/32 7018 for the rest. Thickness didn't matter. The different size electrode was to prevent having to change the amperage so much. This was real nice when you were 75-100 ft in the air. There were alot of times I would liked to of had a few more or few less amps. I did it this way because that's the way they wanted it done. It worked! Liquid and gas and chemical.

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clickent

03-05-2001 20:17:02




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 Re: 6011 root pass followed by 7018 ?? in reply to Scud, 03-05-2001 16:11:05  
"It depends"
Sorry but your question begs for more. In welding all the variables add up to welding procedure. Selecting the proper rod depends on what type of metal, how it is prepared, what forces are at work on your welded joint, what position are you welding and so forth. In some applications 6011 alone is a good choice or 7018 alone. What diameter rod are you using and are you preparing the metal in any way? What type of joint is it?

Since you are asking a hypethetical question I understand you don't know the answers to my questions that is why the answer has to be "it depends"?

The short answer is, the amperage capacity of a welding rod is related to the size of the electrode.

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