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Ok I'm really new to welding and I have a question about the electrode listed above.  I've been reading and searching through these forums and couldn't find what I was looking for.  I just recently bought a pack of Lincoln E7018 rods.  However, when I weld them (just running beads for now  ), they are very porous.  Does this have to do with the heat, travel, or moisture to these rods?  Or is it the whole thing with 7018's not liking the AC power?  Thank you!!!
Reply:Are these 7018AC or just 7018?  What machine are you running them from?  Where did you buy them?  Were they sealed?  What size rods are they?  What amperages did you run them at?  What thickness of material did you try them on?
Reply:All very good questions that will need an answer to answer your question. John -  fabricator extraordinaire, car nut!-  bleeding Miller blue! http://www.weldfabzone.com
Reply:You know what....  Now that I think of it... They are just E7018.  Not E7018AC   So I guess that would explain it, huh?  Well I really do appreciate you both (MAC702 & MicroZone) responding to me.  Thanks again!!  :beer:***Stick welding like, woah.***
Reply:MAC,  These are all of the questions that I had in mind , before I read your post. I love to weld with 7018, but the low hyd. rod has to be dry and there is an AC specific rod. After all of the questions are answered you can advise him, we already clashed on an (NEC) electrical question and I don't want any bad blood before you go to PNG.  Best of luck on your new adventure.Mike
Reply:I don't remember any clashing anyway.  Thanks.  It's hard to clash on the NEC, something's code or not; and sometimes that's independent of whether something is safe or not.Life's less stressful when you don't remember the conflicts!  Cheers!
Reply:Wow, before I got to answer Mac's post, 2 others slid in before me. Teaches me to be so slow responding.
Reply:Originally Posted by DubJOk I'm really new to welding and I have a question about the electrode listed above.  I've been reading and searching through these forums and couldn't find what I was looking for.  I just recently bought a pack of Lincoln E7018 rods.  However, when I weld them (just running beads for now  ), they are very porous.  Does this have to do with the heat, travel, or moisture to these rods?  Or is it the whole thing with 7018's not liking the AC power?  Thank you!!!
Reply:I´d say box was open and moisture got in...Had the same problem with 7018 when I ran them in an AC machine, in my case it was moisture...After I rebaked them as Lincoln suggests porosity was gone...Hoooahh!7018 is a low hydrogen rod. If exposed to std weather after 3 or 4 hours it already has picked so much moisture it will make a porous weld. You´ll need to keep them as sealed as possible and when buying them make sure the box/bag is SEALED. you can make a sealed rod container easily, it just take some PVC tube and creativity. Good luckOh yeah and 7018 runs beautifully on DC however you can get it to work on AC. Its hard and time consuming thouMy Babies: HF Drill pressHF Pipe Bender3   4.5" Black and Decker angle grindersLincoln Electric PROMIG 175that´s it!
Reply:Just remember that this is all for PRACTICE only.  If you are building something structural or for highway use, use a different non-low-hy rod unless you use a factory-sealed package within a few hours of purchasing or you have a PROPER electrode oven.There is a very specific re-baking procedure, and it's only good once.And taking them out of the factory seal and putting into a so-called airtight container still doesn't count for structural welding.Is it done everyday?  Probably.  But that's the manufacturer's specific directions.  You can imagine the liability involved in some applications.
Reply:Running a long arc will also produce porosity with 7018.  Keep the arc length as tight as possible without sticking,  and do not "whip out" as you might do with 6011.
Reply:My first thought on this was also the moisture issue.For the last box of Lincoln rods I bought at Home Depot, I almost bought the 7018s because these weld nicely when in the proper condition.  However, my welding  is rather intermittent so it would take me a while to go through an entire box and I didn't want to worry about rebaking in advance of using these so I went with the general purpose 6013s.This is the first time, however, that I heard that these rods can only be rebaked once.  Does that mean that if you bake a batch of rods and you don't use them up in any given session, the leftovers have to be ashcanned?
Reply:Originally Posted by IrishBrewerThis is the first time, however, that I heard that these rods can only be rebaked once.  Does that mean that if you bake a batch of rods and you don't use them up in any given session, the leftovers have to be ashcanned?
Reply:Originally Posted by IrishBrewerMy first thought on this was also the moisture issue.For the last box of Lincoln rods I bought at Home Depot, I almost bought the 7018s because these weld nicely when in the proper condition.  However, my welding  is rather intermittent so it would take me a while to go through an entire box and I didn't want to worry about rebaking in advance of using these so I went with the general purpose 6013s.This is the first time, however, that I heard that these rods can only be rebaked once.  Does that mean that if you bake a batch of rods and you don't use them up in any given session, the leftovers have to be ashcanned?
Reply:Yeah, I´ve never heard that too...in fact I think you can infere from this that you can dry them as long as you want....http://www.lincolnelectric.com/knowl...nt/storing.aspProbably he says that because of this... "Any low hydrogen electrode should be discarded if excessive re-drying causes the coating to become fragile and flake or break off while welding, or if there is a noticeable difference in handling or arc characteristics, such as insufficient arc force."My Babies: HF Drill pressHF Pipe Bender3   4.5" Black and Decker angle grindersLincoln Electric PROMIG 175that´s it!
Reply:I worked many years for the U S navy. They allowed 110-18 to be re-baked once, and then in holding ovens till issued . at first they only allowed it out on the job 5 hours, but later they allowed it out on the job up to 9 hours ,as per allowed by rod manufacturers. other low-hi ( 70-18; 80-18) was allowed out 9 hours and as many re-bakes as necessary till used up. And , i can assure you nobody is more careful as the Navy ,on submarines. Think about that, what could be as critical as the pressure hull of a submarine ?[SIZE="5"Yardbird"
Reply:AWS D1.1 states that low hydrogen electrodes shall be rebaked no more than once. This is found at 5.3.2.1 The 9 hour E7018's are 'MR' designated, moisture resistant, and can be left open for up to 9hrs, if code allows, then must be returned to the storage oven for an >8hr dry, 4hrs without the 'MR" designation, E11018 is allowed a 1/2hr open time.As clarification, there is a difference between re-drying and re-baking, if you stay within the boundaries you can redry as many times as you wish, but once the rod has been exposed beyond these times, i.e. a can left open overnight, it can be re-baked once, if you were to leave the rods exposed to atmosphere again, they are no longer viable as A.W.S. designated low hydrogen electrodesLast edited by ChamferTrode; 06-14-2007 at 01:32 PM.
Reply:Most construction sites I have worked on give you your rods in a hotbox( or sometimes pie warmer) after you have given the rod storeman your weld spec sheet. At end of day they are returned to the store still in the hot box and if not needed again are retuned to their oven. But we were only allowed one reheat.
Reply:Originally Posted by Roy HodgesI worked many years for the U S navy. They allowed 110-18 to be re-baked once, and then in holding ovens till issued . at first they only allowed it out on the job 5 hours, but later they allowed it out on the job up to 9 hours ,as per allowed by rod manufacturers. other low-hi ( 70-18; 80-18) was allowed out 9 hours and as many re-bakes as necessary till used up. And , i can assure you nobody is more careful as the Navy ,on submarines. Think about that, what could be as critical as the pressure hull of a submarine ?
Reply:Hey Mac702, In my 15 years of government contracting I can assure you that we only screwed the government in accordance with their published specifications. Sometimes you know a better way but it's going to get done the way it's written in the book.
Reply:That's a good one.  I can't tell you how many times I personally witnessed the contractor taking advantage of us because we messed up the contract.  Even on yearly maintenance contracts, the stupid people who write them would not read our reports and would make the same mistakes on the contracts.  The contractor would get the job every year because he already knew he would more than make up the low bid with the corrections.
Reply:Crud.  Well I'm just your noob weldee ( ) and didn't research that enough before I went and bought them.  I don't have a special oven or anything.  I guess I'll just have to burn through them anyway while I'm just messing around.  At least they were only $11.00 and now I have all of this added knowledge of 7018's due to all of you!!    Thanks again!!!!***Stick welding like, woah.***
Reply:Is the porosity throughout the entire weld, or at the start/restarts?
Reply:Unfortunately it's throughout the weld.  I'll take some pictures of it tomorrow so you all can understand.  Thanks BTW, for everyone who has taken an interest in my first thread on this forum.  If I weren't a poor college student, I'd buy you all a round of beers.  ...Or sodas... ***Stick welding like, woah.***
Reply:Originally Posted by DubJ...If I weren't a poor college student, I'd buy you all a round of beers.  ...Or sodas...Originally Posted by MAC702No excuses.  When you owe a beer, you owe a beer!
Reply:x3 My Babies: HF Drill pressHF Pipe Bender3   4.5" Black and Decker angle grindersLincoln Electric PROMIG 175that´s it!
Reply:Hey, here's my thread...  BACK FROM THE DEAD!!! WOOOOOO!!!!!So I continued to use my 7018's just for practice... They aren't porous anymore!  I think I figured out the problem... When I initially tried them, I tried them on an old dirty trailer hitch system for a jeep.  Since then I just bought a single 3x5 sheet of 16g steel.  It's lays a great weld on the sheet metal.  I just wanted to throw this comment back in there in case anyone else was looking for any input on this subject. ***Stick welding like, woah.***
Reply:What a difference clean steel makes!