# Thread: How much current should use?

1. WeldingWeb Apprentice
Join Date
Sep 2007
Posts
17
Post Thanks / Like

## How much current should use?

I want to weld a 12mm thick by arc welding and using size 10 or size 12 electrode. How much the recommended current shoud i use?

2. KRS
Join Date
Mar 2006
Location
Arizona
Posts
289
Post Thanks / Like

## Re: How much current should use?

I wonder what it is that you might be welding?

mild steel

pipe

plate

cast iron

aluminum

stainless

titanium

I wonder what you are welding it to?

I wonder if it's load bearing, like a bridge column or maybe a trailer, or could it be a lamp shade holder?

What type of electrode? Is it AC or DC?

3. ## Re: How much current should use?

What he said plus what's a size 10 or 12 electrode? Is this same strange code like 10 being 10/64ths?

4. ## Re: How much current should use?

What on earth is size 10/12 electrode???

5. ## Re: How much current should use?

It can't be 12 mm plate and a 10mm (.400") rod.

3/8" =.375"

David
Last edited by David R; 10-04-2007 at 11:28 PM.

6. ## Re: How much current should use?

Oh, I must have missed the mm part.

7. ## Re: How much current should use?

"What we've got here is failure to communicate"

Washman

8. WeldingWeb Apprentice
Join Date
Sep 2007
Posts
17
Post Thanks / Like

## Re: How much current should use?

is welding 12mm thick mild steel plates.

9. ## Re: How much current should use?

Not enough info but in the US we use a rule of thumb that says the dia of the rod in thousands of an inch is the number of amps. So a 1/8" = 0.125" would be about 125A. I think this works out to about 4A per mm. This rule is only a rough guide and the dia refers to the dia of the steel rod inside the stick

10. ## Re: How much current should use?

40 amps per mm thickness. 1mm = .039something inches.
The rule of thumb is for one pass welding. Multi pass you can go less and it depends on the diameter of the wire part of the rod and what kind it is.

Which brings me to another rule of thumb (put thumb smily here)

.001 " for one amp works for rod size too. 1/8" rod AROUND 125 amps. Or 40 amps per mm of rod.

David

11. WeldingWeb Journeyman
Join Date
Aug 2007
Location
Manassas, VA
Posts
131
Post Thanks / Like

## Re: How much current should use?

Yea yea yea....

yea yea yea

I vote for that!

12. ## Re: How much current should use?

Originally Posted by David R
40 amps per mm thickness.
David

Yeah thats right. My mistake

13. WeldingWeb Apprentice
Join Date
Sep 2007
Posts
17
Post Thanks / Like

## Re: How much current should use?

12mm thick mild steel plate
electrode size 10 = eldectorde diameter 2.0mm
electrode size 12 = electrode diameter 2.6mm

14. WeldingWeb Apprentice
Join Date
Sep 2007
Posts
35
Post Thanks / Like

15. ## Re: How much current should use?

So 2.0 mm start at 80 amps. 2.6 104 amps.

These are only recommendations. You may have to turn it up or down depending on the type of electrode you are using.

David

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts
•
Page generated in 1,638,392,948.81465 seconds with 13 queries