Magnatized Plate

[welderjon]

I had a piece of one inch AR400 plate cut on a burn table. When I received the plate I found the edges were magnatized. How can I demagnatize the plate so I can weld to it (E71T- Flux Core).
Thanks, Jon

[wolfgangwelding]

Wont welding the plate remove the magnatizum? I cant remember the temp. at which metal becomes demagnetized but I know you will surpas it while welding.

[welderjon]

I think you are right, but for the time being I am tacking because I am still fitting the plate. I can barely make a small tack at this point.

[wolfgangwelding]

You could look up the demagnetizing
temp of that metal and pre heat it useing temp stcks. then weld.

[welderjon]

Thanks Buddy, I'l give it a try tomorrow

[Thomas Harris]

Real de-magnetizers use an alternating electric field to do their thing. An old AC motor winding will work but this is usually reserved for small stuff such and watches, clocks, etc. I believe the item is simply inserted and removed slowly while the windings are energized. I do not recommend such a procedure though, as the motor will be live while this is happening. I would guess that higher friquency AC field would likely do a better job at demagnitizing. Probably not much help, but hey this is the internet!

[Terry Lingle]

Try a couple of good hits with a hammer near where you want to tack then jig and tack. Support the steel so it stays in place when you hit it. Terry

[chip hayden]

for what it's worth, the curie point [demag] is 1333 F. you might want to "do your homework" on the AR plate and it's thickness. you could have to remove some of the flamecut edge before you weld it. the CE [carbon equivalent] of the steel alloy might make it susceptible to hardening from the cutting process. i think you want to pre-heat that thickness also [1"].

[Zrexxer]

Or maybe you just weld it with an AC stick process, since that shouldn't be subject to arc blow?