Magnetic appeal

[Barking Mat]

I briefly tried magnetic attachments, but the arc pull made me give up with them.

 

[mike 109444]

Like this

 

[Misterg]

When I was a computer etc engineer, we installed cat 5 and computers on an industrial estate into a printing company.
All went well until one lady complained her monitor was wobbling occasionally.

I visited a Factory in France once where they cast refractory blocks - They use electric arc furnaces to melt the raw material ( a great big, water cooled metal sphere with electrodes poking into it).

I was invited into the control cabin for one of the furnaces (a bit like a crane cab). Inside was this mad-looking, but very happy French man with a joystick controller in each hand, wiggling and poking the electrodes about. He was surrounded by various camera feeds and monitors that were all wobbling wildly (45 degrees or more). How he stuck it, I'll never know - perhaps he wasn't mad-looking when he started the job!

 

[zeppelin builder]

You ever welded used drill pipe? That’s fun.

You have to wrap the return round it by the weld to counteract the magnetic field in the pipe.

had to get a specialist de gaussing
company in to do some 4 inch pipe at a spool base could hang a tig wire on it and no way could you root it , be around 40 km of it , sat in the teahut for a week gettin paid

apparantly if the drillpipe is stored n/s direction through time it will
go magnetic so a yank told me ???

 

[Screwdriver]

had to get a specialist de gaussing
company in to do some 4 inch pipe at a spool base could hang a tig wire on it and no way could you root it , be around 40 km of it , sat in the teahut for a week gettin paid

apparantly if the drillpipe is stored n/s direction through time it will
go magnetic so a yank told me ???

That doesn't sound right to me. Much more likely to become magnetised in operation. Especially when a long length is pulled out of the ground. The equivalent of rubbing a stick of amber on your jumper.

 

[Screwdriver]

I think you may be mixing up magnetism and electrostatic charge?

What you mean like Maxwell did?

 

[James1979]

That doesn't sound right to me. Much more likely to become magnetised in operation. Especially when a long length is pulled out of the ground. The equivalent of rubbing a stick of amber on your jumper.

It’s because it rubs in the ground, apparently

 

[cheb]

In the same way you can magnetise a screwdriver* by rubbing a magnet up and down it.

*Possible Screwdriver too, though I've haven't tried.

 

[Screwdriver]

It’s because it rubs in the ground, apparently

That would be my assumption too. Interesting side note regarding electricity vs. magnetism. They are of course the same thing, hence electromagnetism, electromagnetic force etc. That was a quite brilliant deduction made by James Clarke Maxwell and even to this day (and in this very thread!) it can be difficult to reconcile the very different effects we observe caused by the electromagnetic field.

Bonus trivia: there is only one EM field which pervades the entire universe.

PS If you rub me the wrong way I don't become magnetic (quite the opposite) but I can become highly charged!

 

[James1979]

PS If you rub me the wrong way I don't become magnetic (quite the opposite) but I can become highly charged!

I need mind bleach….

 

[caprinut]

Where you CAN use them, try having a bright light behind the weld/gap and then use a length (bout 12 inches) of copper pipe with the last 2 inches flattened. Now just before you go to tack place the flattened end of the copper pipe up to the fine gap in the panel. You will know where to tack as the light will be blocked by the copper pipe and it should also cut down on blow through.

I have those as well bit of 22mm flattened and bent at 30 degrees, however I'm currently working at the front left of a car so I would have to hold it with my right hand and weld with the left. I'm getting on a bit so I steady my right with my left and although I love Ronnie O'sullivans snooker playing I can't do what he does.

Bert

 

[Screwdriver]

I have those as well bit of 22mm flattened and bent at 30 degrees, however I'm currently working at the front left of a car so I would have to hold it with my right hand and weld with the left. I'm getting on a bit so I steady my right with my left and although I love Ronnie O'sullivans snooker playing I can't do what he does.

Bert

Lie on your back.

 

[caprinut]

Lie on your back.

Can't reach it it's on a spit, could do it upside down but why would you of learn to do that when you have a spit, at the mo it's nicely at chest level and 30 degrees.

Bert

 

[Screwdriver]

Can't reach it it's on a spit, could do it upside down but why would you of learn to do that when you have a spit, at the mo it's nicely at chest level and 30 degrees.

Bert

If it's on a spit surely you can turn it over.

Anyhow this conversation has moved away from electromagnetism and lost its attraction.

 

[caprinut]

If it's on a spit surely you can turn it over.

Anyhow this conversation has moved away from electromagnetism and lost its attraction.

 

[outofthefire]

As an aside from the magnetism, i'd sling the brass and try copper or ally as a backing. The zinc burns off the brass you might as well be welding galv

 

[caprinut]

Interesting is there some chemistry involved? albeit that I remove the 'weld through primer' from the 'plug-hole' with a glass fibre pencil beforehand to keep the weld as clean as possible, wish someone would develop a glass fibre pencil to fit a pistol drill.

Bert

 

[8ob]

Interesting is there some chemistry involved? albeit that I remove the 'weld through primer' from the 'plug-hole' with a glass fibre pencil beforehand to keep the weld as clean as possible, wish someone would develop a glass fibre pencil to fit a pistol drill.

Bert

A quick dab with a spot weld drill is ideal for cleaning up a hole for plug welding.

Bob

 

[Eric the chicken]

Anyhow this conversation has moved away from electromagnetism and lost its attraction.

Yep, poles apart now.