E7018 vs ER70S3 welds

Let's say that you have two welds connecting identical materials. Both are well done and produced by qualified weldors, with proper settings, etc.

Would there be a material difference in strangth or ductility or performance, between welds done with E7018 (stick) or ER70S3 (MIG).

i
Reply to
Ignoramus10660
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No significant difference. The Mig is low hydrogen as is the E7018. I would trust the Mig a bit more because the E7018 might not have been stored in an oven.

Dan

Reply to
dcaster

" snipped-for-privacy@krl.org" fired this volley in news: snipped-for-privacy@googlegroups.com:

It would have been if it was done according to Ig's initial conditions -- "qualified weldor".

Lloyd

Reply to
Lloyd E. Sponenburgh

Ignoramus10660 on Sat, 05 Apr

2014 17:28:58 -0500 typed in rec.crafts.metalworking the following:

There should not be any difference, all things being equal.

But that's the thing - can you be sure all the things are equal?

-- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."

Reply to
pyotr filipivich

Iggy's question is interesting - certainly to me - and I would like to know practical experienced knowledge / insight on this.

7018 welds are very strong and tough - often get general bending of the metal around the weld in overstress - protecting the weld. Even when ground-at a lot, reasonable penetration can leave hidden bits of weld remaining, so it can be very hard to break off "temporary attachments" someone has seen fit to do with a 7018 (where 6013 temporary attachment would serve well but is easily removed).

Please - I am also interested in Iggy's question - relatively, how does good ER70 rate alongside 7018?

Rich Smith

Reply to
Richard Smith

Yep, 7018 s very ductile and can bend a lot before breaking. This is why I use it for those "anvil tables" and such.

i

Reply to
Ignoramus30810

j

My criterion would be if it HAS to hold, or is subject to a lot of stress, I'd stick it. Yes, you can crank up the amps on a wirefeed, but I just feel more confident with a hot 7018, or even 7014 vs. E70.

Steve

Reply to
SteveB

This is how I see it also. Stick it with 7018

I use 6013 for all quick unimportant jobs.

i
Reply to
Ignoramus30810

For what?? is my response.

It seems, according to the textbook, that the two are pretty much equivalent - they both give a joint with 70,000psi tensile strength. One difference to E7018 is that it can be used with AC, while the ER70s3 is recommended for DC+. Your Mileage will vary, I'm not a welder, nor did I stay at a Hotel 6. But I did just finish a class on the subject, "and I've read a book".

-- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."

Reply to
pyotr filipivich

j

My criterion would be if it HAS to hold, or is subject to a lot of stress, I'd stick it. Yes, you can crank up the amps on a wirefeed, but I just feel more confident with a hot 7018, or even 7014 vs. E70.

Steve

Reply to
SteveB

Didn't Gunner once write a treatise on how to MIG weld a spare tire mount on a trailer?

Reply to
John B.

Should be no difference. I myself use ER70S6, has a little more de-oxidizers in it, I do a lot of repair and the base metal is not always perfectly clean.

If you follow the AWS, pulsed MIG is now becoming the preferred choice for structural welds. Tends not to crack as fast in earthquakes.

I dropped my AWS membership but still get a ton of free trade magazines.

Remove 333 to reply. Randy

Reply to
Randy333

I agree, 6011 gives far deeper penetration. And we all like that.

Now, I tend to get undercut edges with 6011. For a purty weld, put

7014 on top.

Karl

Reply to
Karl Townsend

Gunner Asch on Tue, 08 Apr 2014 09:00:32 -0700 typed in rec.crafts.metalworking the following:

Reminds me of my Welding instructor's story about the Alaska pipeline. Seems that the contract called for radiographic inspection of all joints. Which the subcontractor did, for the first 200. Then they got cute and tried to just copy the radiographs for all the subsequent ones. Got caught when an employee thought something suspicious. They had to go and re inspect all the welds. Including the ones which were buried under the rivers. The company wanted to send an ultrasonic unit down the pipe for those, but the court said "radiographic is what it in the contract, and radiographic it will be." So those section were uncovered, cut loose, inspected and signed off, then welded back together, the new welds inspected and signed off, and finally reburied.

Anyway, I've read a book, so I know that what I don't know would fill a book, and that it is more than just "zoooottttt!" and your done. Of course, I knew that back in the day, too. B-) [When 24 of your 28 welds fail ... you know there is definitely room for improvement.]

tschus pyotr

-- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."

Reply to
pyotr filipivich

Shortcuts were -very- expensive for that sub, huh? Aren't most pipelines robotically welded nowadays? Bots with cameras find the junction, weld it up, grind it flat, inspect it, x-ray it, and run down the inside of the pipe to get the next one. Very cool.

You picked up the hint, did you?

Har! That's the thing I love about MIG. It can look so darned good and a fly landing on it can knock the whole blasted thing down. :/ I hope nobody brings up Gunner's runaway trailer tire in this thread.

Reply to
Larry Jaques

The difference would have little to do with the weld filler material, and more to do with the weld procedure. If preheat and overall weld heat are the same, the welds should nearly identical.

ER70S-3 isn't used for general steel welding. It is used for only new clean steel. ER70S-6. ER70S-6 has more deoxidizers and is better for general welding, and is closer to 7018 in it's cleaning ability.

Reply to
Ernie Leimkuhler

Ernie,

GOOD to see you. Thought you were long gone from RCM.

Karl

Reply to
Karl Townsend

Larry Jaques on Tue, 08 Apr 2014

21:39:54 -0700 typed in rec.crafts.metalworking the following:

Possibly. Although I'm under the impression that there are trade-off, that some parts of it can be automated, while others still require an idiot to go and hang upside down and weld with a mirror.

I told the boss I'd give it a try. It wasn't critical, just tack welding some sheet metal boxes together.

No, that would not be nice.

pyotr

-- pyotr filipivich "With Age comes Wisdom. Although more often, Age travels alone."

Reply to
pyotr filipivich

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