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Tool Talk Discussion Forum

Best welding rod for machining.

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Bruce L

08-30-2003 21:22:39




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I was wondering what AC welding rod would be best for building up surfaces that are to be machined? I have been tightening up some clutch linkages and tried both 6011 and 6013. They both worked but the 6013 seemed to have more slag inclusions. Is there another choice that would be better?

Bruce L




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T_Bone

09-01-2003 10:07:21




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
Hi Bruce,

Any of the common AC electrodes will machine just fine, 6011, 6010, AC7018, 7014, etc provided they are rated by the mfg for AC use. Any of the above rods can be used for any welding position.

The prosity is coming from faulty electrode manipulation by the weldor. Try a higher heat steeing, electrode angle 10* to 15*, close arc length, clean base metal prep.

As Fred pointed out, some metals will harden when welded and need to be stress relived before machining. Heat too straw color then let air cool until cold.

T_Bone

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Tom

09-01-2003 09:05:04




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
Bruce, you will get almost as many rod recommendations as you get responses. Here is my take. What you want to achieve above all else is a good clean buildup, with pits, holes, and flaws. Therefore, the rod you can weld the best quality bead will make the best base for turning the part down. I can run the best, highest quality beads with the 7014 rods. Experiment on similar steel, and use the rod that you can handle best.

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Gav-n-Tn

09-01-2003 07:04:59




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
Bruce, I meant to say DC electrode positive when using 6010,6011 or 7018. I think in terms of reverse polarity,but have to remind myself that welding uses the "flows from negative to positive" theory.



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Gav-n-Tn

09-01-2003 06:19:47




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
Bruce,
There is no best AC rod for machining because DC with electrode negative is the best way to weld mild steel. Your 7018 has a tensile strength of 70,000-79,000 psi, but is not as good for using on highly contaminated surfaces. It would be the best for a clean,smooth weld. 6011 has a tensile strength of 60,000-69,000 psi and is good for material with rust,scale,etc. but does not weld as "smooth" as 7018. Of course there is alot to arc physics. I understand that you may only have an AC machine, but you don't get the best results when you use anything other than DC electrode negative on steel and that includes stainless.

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SHeiserman

09-01-2003 06:42:58




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 Re: Re: Best welding rod for machining. in reply to Gav-n-Tn, 09-01-2003 06:19:47  
So, you're saying the BEST advice here is to look into a DC machine? If so, I would agree. I know I'm the one who brought up 7018. If he's having trouble with slag with 6013, he probably won't be happy with 7018. I think if a guy is going to do much welding, a DC machine would pay for itself in short order.



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Gav-n-Tn

09-01-2003 07:00:21




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 Re: Re: Re: Best welding rod for machining. in reply to SHeiserman, 09-01-2003 06:42:58  
Yes, I am saying that a DC welder is the BEST choice. If you study about arc physics and welding theory, it makes sense as to why you use whichever rod in certain conditions and how the welder needs to be set up. There is a time and place for AC, but that is with a GTAW/TIG setup using high frequency to wel aluminum and stainless.Not a rod. A stick welder needs to be set at DC electrode positive for 6010,6011 and 7018. I think I said electrode negative earlier and I meant positive.

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SHeiserman

09-01-2003 09:07:37




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 Re: Re: Re: Re: Best welding rod for machining. in reply to Gav-n-Tn, 09-01-2003 07:00:21  
Question: When do you use high freq TIG on stainless?



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SHeiserman

09-01-2003 06:41:33




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 Re: Re: Best welding rod for machining. in reply to Gav-n-Tn, 09-01-2003 06:19:47  
So, you're saying the BEST advice here is to look into a DC machine? If so, I would agree. I know I'm the one who brought up 7018. If he's having trouble with slag with 6013, he probably won't be happy with 7018. I think if a guy is going to do much welding, a DC machine would pay for itself in short order.



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Rick

08-31-2003 20:02:55




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
I agree W/ everything posted thus far, but knowone has mentioned; 1. You can buy 7018 AC rod, which is limited to horizontal welding only,(no overhead)! 2. 6010 works well in situations where you have a dirty or rusted parent material. 3. If you're welding something that doesn't need to be strong necessarily, even cast iron parts, but needs to be shapable, then, I'd use a nickel based rod, they make different ratios of nickel/steel to control the strength factor. (also very easy to weld with) Hope this helps, Rick

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Fred OH

08-31-2003 19:39:28




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
There is a 7018 rod made for AC welding...just go to a good welding rod supplier and ask for it...also...today there are metals like leaded cold rolled steel that won't weld with any rod because of the lead gassing and causing porosity in the weld. Probably have to use the torch and brass or bronze rod. It'd wear okay for what you're doing. L8R....Fred OH



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Rod

08-31-2003 19:20:01




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
Guess it was SHeiserman and not Tom that mentioned 7018



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Trampas

08-31-2003 19:18:03




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
A 7018 ac rod would be your best bet if you are building up mild steel, your typical 7018 dc rod will not run well on an ac welder they run best on DC+



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Rod

08-31-2003 19:17:21




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
Bruce.
If you are welding all flat with long length beeds I would use 7024 or 7014.(Called jet rods in my old days) The trouble with 7018 like Tom mentioned I believe it is a low hydrogen rod and is harder then mild steel and works best using D.C. reverse instead of staight A.C. The rod will stick to what your welding like crazy using A.C. if your not used to using it. We always used this rod if we didn't know the hardness of the metal we were welding.
I don't like 6013 because of the holes that sometimes show up under the slag when you chip it off. I do like 6011, but it splatters more, but so what. I welded for a living for many years. If you use 6011 work it back and forth as you go. I say this because a lot of people who weld flat don't know how to.
Hope this helps you.

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Bus Driver

08-31-2003 14:38:44




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
I would agree with all the electrode types mentioned thus far. Another thing that is involved is the "parent" material that is being welded. Certain alloys when welded will have welds that are very hard- no fault of the electrode. Some might argue with me, but I have seen welded material where the weld is harder than either the electrode or the parent material before the welding.



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SHeiserman

08-31-2003 07:16:37




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
See what you think of 7018. We use DC welders and 7018 is what they have us use most of the time. 309 SS and Super Missile Weld are others, but I don't know how they work with AC.



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Tom

08-31-2003 05:18:15




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 Re: Best welding rod for machining. in reply to Bruce L, 08-30-2003 21:22:39  
7014



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