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Old 11-14-2006, 09:47 AM
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Caliber Caliber is offline
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Default 7018 Lm

The shop teacher gave me some rods that where given to the school a "few" years ago, from a nuclear plant (about 50 lbs worth) they're marked 7018 LM,, what's the LM mean?
Think I can dry out these rods and make them useable?
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Old 11-14-2006, 11:32 AM
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Do you know what brand they are? I googled 7018LM and only got one hit. Looks like it may be the trade name for Tri-Mark electrode similar to Lincoln 7018 LH-70. LINK If the flux runs good you can probably use them as is for non critical stuff.
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Old 11-18-2006, 10:02 PM
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Quote:
Originally Posted by Caliber
The shop teacher gave me some rods that where given to the school a "few" years ago, from a nuclear plant (about 50 lbs worth) they're marked 7018 LM,, what's the LM mean?
Think I can dry out these rods and make them useable?
If your cook stove is gas operated, and has a standing pilot light, put the rod in the oven, and leave it for a few days.
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Old 11-19-2006, 05:36 PM
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make them usable, yup, most likely, but make them to stand up to code requirements, no, not unless the package is still sealed.
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Old 11-19-2006, 07:11 PM
IForgeIron IForgeIron is offline
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Not sure my stove gets hot enough to dry and recondition 7018 rod. <grin>
http://www.lincolnelectric.com/knowl...nt/storing.asp
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Old 12-12-2006, 05:18 PM
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I finally found time to burn a few of these rods. I had them in a light gauge steel box (a fusee/ flare box from a bus) I put the box on top of the main water line from the boiler for the floor heat, it runs about 140*, left it there for about two weeks.
They start very hard, it takes a hard tap or scratch to get a spark, once they light they flow beautifully. Nice beads with very little effort.
I tried both AC and DC, found that I could start them easier on AC.
The shop teacher gave me the rest of the 50lbs box, it only had about 20 rods gone. I'm going to dry few out at a time and send them back to the shop class as they need them, these are just for practice welding.
The box had the name Cortex on it.
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Old 12-21-2006, 07:58 PM
deltarome deltarome is offline
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The weld rod is common 7018 carbon steel filler metal but the flux is treated to resist moisture absorbtion. The LM means Low Moisture. It reduces potential hydrogen embittlement in the weld from diffused hydrogen but only lasts for a few hours once the can is opened. You should bake it out at 300F for 8 hours and if the rod is rusted, dump it.
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Old 12-22-2006, 12:13 AM
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And yes, there is an answer.

Welcome "deltarome".
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Old 12-22-2006, 08:04 AM
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Quote:
Originally Posted by Soapy
If your cook stove is gas operated, and has a standing pilot light, put the rod in the oven, and leave it for a few days.
Soapy please do some research before post comments like this.

Quote:
Originally Posted by caliber
I finally found time to burn a few of these rods. I had them in a light gauge steel box (a fusee/ flare box from a bus) I put the box on top of the main water line from the boiler for the floor heat, it runs about 140*, left it there for about two weeks.
Buddy 140F didn't do a damn thing.

Please read the link IFORGEIRON posted. It does a good job 'splanin' everything.

It has been discussed here before the components of the fluxes used in LH rod form hydrates much like concrete does when concrete cures. Much higher temps are required to break the hydrate.

As for the chart
Attached Files
File Type: htm smaw redrying temps.htm (19.7 KB, 129 views)
File Type: xls smaw redrying temps.xls (18.5 KB, 137 views)
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