Magnet Affecting Arc

[Turbo]

I need to weld up a random hole some twit drilled in the middle of a boot floor of my 306. As it was thin French tin I needed to use a backing piece. I used a piece of flattened copper pipe & held it against the bottom of the hole by placing one of my strong welding magnets under it, sandwiching the copper between it and the boot floor.

When I tried to weld it was nearly impossible with the weld spitting back at me. It was like hitting a pocket of oil or water. I thought the copper was contaminated so I cleaned it, no better. By this stage the copper had got stuck to the back of the weld so I removed the magnet - problem solved, the welder was working perfectly!

It was as if the magnet was pushing away the molten metal from the pool! Anyone else experienced this?

 

[morssdn]

When I've tried to use a right angle magnet to hold small pieces of steel on to a larger piece, and the weld is very local to the magnet it does seem to stop the weld pool functioning as normal; it would often only attach to one part rather than both and not run smoothly.

 

[lionleg]

Not actually experienced it but it is a known fact. If my memory serves me correctly it's known as 'arc draw'.

 

[rtbcomp]

Magnetic field + electric current = force. Flemming's Left Hand Rule.

The resultant force moves the arc, like it would move a conductor in a magnetic field.

 

[Scotland90]

I need to weld up a random hole some twit drilled in the middle of a boot floor of my 306. As it was thin French tin I needed to use a backing piece. I used a piece of flattened copper pipe & held it against the bottom of the hole by placing one of my strong welding magnets under it, sandwiching the copper between it and the boot floor.

When I tried to weld it was nearly impossible with the weld spitting back at me. It was like hitting a pocket of oil or water. I thought the copper was contaminated so I cleaned it, no better. By this stage the copper had got stuck to the back of the weld so I removed the magnet - problem solved, the welder was working perfectly!

It was as if the magnet was pushing away the molten metal from the pool! Anyone else experienced this?

when i tried tacking metal with an eclipse magnet it literally grew a horn up the way

 

[windingroads]

Yes, magnets do this, and when you weld for long enough you will find a magnetic rod
or magnetic piece of steel.
Or that you can one day all of a sudden weld good on one direction, and terrible in the other, that's magnetism, and migs will do the same.

 

[Sarto]

If you search the net for ARC BLOW you can find the scientific explanation.
But in the end, strong variations in the magnetic field, throw the arc and the puddle everywhere.

In this video they show something about it.