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Old 10-27-2018, 11:26 PM
Nomoreusmc Nomoreusmc is offline
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Default Funny puddle

I sometimes get an almond shaped puddle on steel, but never on aluminum. It makes a funny looking bead. Am I sharpening my tungsten wrong? I added a little more gas(25 cfh) because I am right in front of the open garage door, Lincoln protig 17flex 3/32 tungsten, pink 10 cup, jumbo gas lens, sw200. Never happens when I am on pulse. Been using 10 or 11 pp/s with round sharp instantly freezing dimes, no pulse almond shapped 1/2 the time.

Been running 170amps on 1/4 in plate prepped to clean bright metal

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Old 10-28-2018, 12:28 PM
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Are you running the steel on d.c. ?
And the aluminum on A.C. ?

Might be some arc blow.
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Old 10-28-2018, 03:44 PM
Nomoreusmc Nomoreusmc is offline
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Yes, can you get arc blow with the ground on the part?


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Old 10-28-2018, 04:42 PM
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Uhm....where else would you put the ground ?
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Old 10-28-2018, 07:34 PM
Nomoreusmc Nomoreusmc is offline
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Quote:
Originally Posted by digger doug View Post
Uhm....where else would you put the ground ?
On the welding table, which is usually how I get arc blow. I move it to the part and it's gone, usually

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  #6  
Old 10-28-2018, 08:33 PM
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Quote:
Originally Posted by Nomoreusmc View Post
On the welding table, which is usually how I get arc blow. I move it to the part and it's gone, usually

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I would call it intermittent grounding which may seem like arc blow since the amperage is going up and down.
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Old 10-28-2018, 08:44 PM
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Well yes.... the further away your ground is from the work piece the more likely you are to have issues...

In every training/Trade school I've ever been to we were always told the ground should always be attached to the work piece. But that does not mean you will not have Arc Blow because.... Shit happens!

But if it is not plausible or possible to attach the ground to the work piece it should be as close to it as possible....

I've also come across applying for certain positions in welding shops some would even have that specific question in their small written test as to where the ground should be located. their form I.Q. testing I would imagine
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Old 10-29-2018, 06:46 AM
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If you have the capability of running AC, try that.
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Old 10-29-2018, 11:27 AM
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I was under the impression that arc blow is a DC problem. AC wasn't supposed to have that issue.

If you are grounding to,your table, have you tried a welder's third hand? Some make them up with brass tips to improve grounding to the table.
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