Arc blow

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Tried everything but couldn't eliminate it. Maybe cant eliminate it in such close corners, don't know.   Material is mild steel 2" X 3/8" about 18" on each side. Using 5/32 7018.

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Trailblazer 302Hobart Stickmate AC/DCLincoln SP 135 TSmith torchSpoolmatic 30A
Reply:I thought I heard the cure for arc blow was AC welding. You tried that and it didn't help?---Meltedmetal
Reply:I agree with the AC comment. Also, in what order were the parts welded? All inner sections placed and tacked before main welds were made (thus in tight quarters)? If so, might it have been better to mark the outside where the inner ends would go and starting near the two outside corners, fully weld each one in turn so only the last center piece had less room?What do these have to support, just people, lawn equipment wheels, automobiles/trucks, or nothing? Where are they designed to go; triangular is not common..Last edited by Oldiron2; 2 Weeks Ago at 11:43 AM.
Reply:The triangle shape was welded up first and then the bars were set in from the outsides and progress toward center alternating from one side to the other. Tried AC a little but I have trouble with 7018 on AC and didn't have any AC7018. By the way it's a grate for the firebox in a Amish wood heater for a greenhouse so I got lucky as it didn't have to look pretty.

Trailblazer 302Hobart Stickmate AC/DCLincoln SP 135 TSmith torchSpoolmatic 30A
Reply:AC and 7014 will cure your problem nicely

Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:Never even thought about that. I'll get some and put in the truck for occasions like this.Thanks.Trailblazer 302Hobart Stickmate AC/DCLincoln SP 135 TSmith torchSpoolmatic 30A
Reply:Smaller rod use 1/8 inch or 3/32
Reply:

Originally Posted by shortarc

Never even thought about that. I'll get some and put in the truck for occasions like this.Thanks.
Reply:This isnt truly arc blow everyone seems to think is common,,,, I never get it, this is a rod angle problem.  Turn the machine up, shove the rod in it.Last edited by Sberry; 2 Weeks Ago at 07:13 AM.www.urkafarms.com
Reply:Tried every angle from dragging the rod to pushing it with no help. if I turn the amperage up it will just blow a crater and large BB's everywhere.Trailblazer 302Hobart Stickmate AC/DCLincoln SP 135 TSmith torchSpoolmatic 30A
Reply:

Originally Posted by shortarc

Tried every angle from dragging the rod to pushing it with no help. if I turn the amperage up it will just blow a crater and large BB's everywhere.
Reply:

Originally Posted by Sberry

This isnt truly arc blow everyone seems to think is common,,,, I never get it, this is a rod angle problem.  Turn the machine up, shove the rod in it.
Reply:I did not know that on DC.Most of My stick welders was AC and never had problem. Dave

Originally Posted by MinnesotaDave

I've experienced it many times, especially on items that are already magnetized.Some drill pipe made a DC arc go sideways. (it would hold up a hammer)AC fixed the problem and I welded happy.


Reply:there is something about the area on the inside of flange of i-beam, about 1/4 - 1/3 of the way from the web, too the outer edge of flange, that sometimes i gives arc blow.   so its not uncommon to get arc blow in that short stretch, while welding in a stiffener.     switching to ac, ususually isnt an option
Reply:

Originally Posted by 123weld

there is something about the area on the inside of flange of i-beam, about 1/4 - 1/3 of the way from the web, too the outer edge of flange, that sometimes i gives arc blow.   so its not uncommon to get arc blow in that short stretch, while welding in a stiffener.     switching to ac, ususually isnt an option
Reply:

Originally Posted by Oldiron2

Sometimes changing the position of the ground cable (or adding a short jumper so the current comes over different paths) can reduce the "arc blow". On DC, the arc is magnetized so reacts to the magnetic field set up by the current beyond the arc. Currents coming different ways can set up competing fields that oppose (neutralize) each other.
Reply:Sometimes, no matter what you try to do..........arc blow will defeat you.

  The arc simply went where it wanted.Changed over to AC, and 7018AC for these particular welds...................

  Although the AC variety is prone to surface porosity, it can be successfully run at fairly high amps, with the rod literally shoved into the metal.  I like looking at my old welds before my eyesight went completely South.  (still no response from the eye doc appointment request)
Reply:

Originally Posted by farmersammm

Sometimes, no matter what you try to do..........arc blow will defeat you.  The arc simply went where it wanted.Changed over to AC, and 7018AC for these particular welds...................  Although the AC variety is prone to surface porosity, it can be successfully run at fairly high amps, with the rod literally shoved into the metal.  I like looking at my old welds before my eyesight went completely South.  (still no response from the eye doc appointment request)
Reply:

Originally Posted by Oldiron2

I wonder what would happen if a degaussing coil were put just behind that metal while welding with DC?
Reply:I have burn a lot with E7018 rodI have never had arc blow but is was mostly with AC .Very interesting photo.Dave

Originally Posted by farmersammm

Sometimes, no matter what you try to do..........arc blow will defeat you.

  The arc simply went where it wanted.Changed over to AC, and 7018AC for these particular welds...................

  Although the AC variety is prone to surface porosity, it can be successfully run at fairly high amps, with the rod literally shoved into the metal.  I like looking at my old welds before my eyesight went completely South.  (still no response from the eye doc appointment request)
Reply:I was gonna comment about eyesight,,, then figured if arc blow makes it sound better,,, well...www.urkafarms.com
Reply:It could be never had problem is most time my first pass was E6011 then the rest was E7018.If had a large gap I use E6013 first past and then E7018.Dave

Originally Posted by Sberry

I was gonna comment about eyesight,,, then figured if arc blow makes it sound better,,, well...
Reply:

Originally Posted by Sberry

I was gonna comment about eyesight,,, then figured if arc blow makes it sound better,,, well...
Reply:

Originally Posted by Sberry

I was gonna comment about eyesight,,, then figured if arc blow makes it sound better,,, well...
Reply:

Originally Posted by farmersammm

So, hero?.............you've never seen arc blow shove a puddle off line?

Originally Posted by jpump5

By “degaussing coil” do you mean the device for demagnetizingthe CRT in an old television?
Reply:I believe it's less common nowadays simply because wire is used so much now in high amp applications. I have had it happen with dual shield running high amps. As for stick, a lead with 2 ground clamps often alleviates the problem. Moving ground location often helps along with wrapping the ground lead around the work often works also.