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Old 11-21-2019, 04:32 PM
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welding wire for spot welds

I just replaced my mig welder (found the weak link). I had a body shop hand me down mig, that went nuclear on me. I was still running on a 45# spool that came with the welder. E70Rs-3 wire which has no copper coating. Most fabrication wire is E70Rs-6 with a copper coating.


I once heard that copper wasn't something you wanted in a spot weld for body work.


Is this a myth or is there some science behind it?


You body shop gurus this is for you!

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Old 11-21-2019, 05:22 PM
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There is such a thing as easy grind mig wire. That should be good for body work.
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Old 11-21-2019, 06:38 PM
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To my knowledge I have never tried easy grind. Don't know the numbers or what they mean. Somebody else goes to get the wire. I ask for plain .030 MIG wire and use what they bring.

I think you'd rather have the copper coating instead of iron oxide.
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Old 11-21-2019, 07:30 PM
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That is the odd thing about this wire there is no hint of rust. Only a slight smoke coating from where I let the smoke out of the wires inside of the welder.
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Old 11-21-2019, 08:38 PM
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I believe the easy grind is Silicon Bronze. I have used it and it can take hammer and dolly work where ER70 won't. If you use it at the end of a weld where it can flex, I've had it crack there.

Keith
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Old 11-22-2019, 04:06 AM
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Quote:
Originally Posted by MGK View Post
I just replaced my mig welder (found the weak link). I had a body shop hand me down mig, that went nuclear on me. I was still running on a 45# spool that came with the welder. E70Rs-3 wire which has no copper coating. Most fabrication wire is E70Rs-6 with a copper coating.


I once heard that copper wasn't something you wanted in a spot weld for body work.


Is this a myth or is there some science behind it?


You body shop gurus this is for you!
My advice is to follow what idrivejunk mentions. Look at some of his submissions onto this forum. His welding and working with weld is almost surreal IMHO. Perhaps alot of guys have his skill set, I've just never came across anyone else. Perhaps he can add a couple of photos or link a thread and suggest a couple of posts in the thread.

His workmanship is absolutely crazy GOOD.
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Old 11-22-2019, 07:31 AM
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Quote:
Originally Posted by 64nailhead View Post
My advice is to follow what idrivejunk mentions. Look at some of his submissions onto this forum. His welding and working with weld is almost surreal IMHO. Perhaps alot of guys have his skill set, I've just never came across anyone else. Perhaps he can add a couple of photos or link a thread and suggest a couple of posts in the thread.

His workmanship is absolutely crazy GOOD.
Thanks, nailhead man. Watch how clumsily I react to kind words...

Er, I, uh... would like to think theres ten guys in a ten mile radius that can do what I do at any given time. But I get lots of practice at plug welding and this (from page 1 on "The Day's Work" project thread) was a favorite adventure.



You guys have me wanting to peek at the spool when I get to work and see what I'm using. IIRC its usually Lincoln wire in the Miller machine. But I am more from the Gilligan school of thought than the Maynard.

MGK, some wires can't hold they smoke. Thats what it is. (Breakfast club reference)

There are guys here who weld much better than I do but thay aren't the blabbermouth types. Anything any man does day in and day out will eventually become second nature.
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Old 11-22-2019, 08:27 AM
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I have been doing body work and panel replacement on cars and trucks for 40 years. I have used nothing but copper coated mig wire and have had absolutely no issues with it. The copper flashes off in the arc and vaporizes, there is not enough copper to hurt anything in the weld as far as I have seen...
I have done thousands of plug welds with this wire with no ill effects....
Here are a few on a current project.






I have about a hundred to do on the '56 wagon where I am rebuilding both cowl sides.



I will get pics during the welding process and post them up. They will look no different then the ones I just posted though.
Mark
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Old 11-22-2019, 09:15 AM
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Quote:
Originally Posted by blwn31 View Post
I believe the easy grind is Silicon Bronze. I have used it and it can take hammer and dolly work where ER70 won't. If you use it at the end of a weld where it can flex, I've had it crack there.

Keith
I have asked not one, not two, but three welding supply suppliers, none of them has heard of "easy grind" wire. Google turns up nothing, nada.
Silicone Bronze? Could that be the infamous "easy grind"?

Sorry for the hijack

Regards

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Old 11-22-2019, 09:54 AM
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Heres whats in the welder I use-

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Old 11-22-2019, 10:53 AM
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I feel better - that's the same wire I use.

I don't doubt that there are alot of guys around you that can do what you're doing. And I don't doubt that there a bunch of guys on here that can do the same or better. It's just not in my skill, and tool set.

For that matter, you have more cars in your photo album than there are in my area that have that type of finish work on them.
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Old 11-22-2019, 04:33 PM
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The L56 wire is ER70s-6 and Er70s-6 is generally what's recommended for bodywork. One of the reasons is that it does well with less then perfectly clean metal or mill scale. I forget which grade it is that's deemed softer but the welds don't carry the same tensile strength and it won't pass an I-Car destructive test. This is important if you're welding frame rails and other structural components and everything including quarter panels on a unibody is structural so there's that.. The Lincoln wire is good stuff.

Er70s-6 even with the coating can get "fuzzy" from sitting unused for an extended time and cause feeding or welding issues so if the welder sits I usually pull the spool and bag it.

Last edited by Hipster_G; 11-22-2019 at 04:45 PM.
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Old 11-23-2019, 01:20 PM
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Quote:
Originally Posted by MecGen View Post
I have asked not one, not two, but three welding supply suppliers, none of them has heard of "easy grind" wire. Google turns up nothing, nada.
Silicone Bronze? Could that be the infamous "easy grind"?

Sorry for the hijack

Regards

Sent from my SM-T590 using Tapatalk
https://www.esabna.com/us/en/product...easy-grind.cfm
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Old 11-23-2019, 07:55 PM
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Thanks !
Figures, one of the suppliers I asked is a distributor of their wire ....

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