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  #46 (permalink)  
Old 02-21-2009, 01:02 PM
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redneck way

id just roll the car over on its roof,cant wait to get to the shop and try that magnet trick,its the coolest thing ive ever heard since copper backing when welding sheetmetal,ever get a hot slag in your ear?
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  #47 (permalink)  
Old 02-21-2009, 01:34 PM
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Quote:
Originally Posted by deadbodyman
cant wait to get to the shop and try that magnet trick,its the coolest thing ive ever heard since copper backing when welding sheetmetal,


You will be wasting your time with that magnet, in fact it will be detrimental to the process. Did you read this entire thread? Molten metal is not affected by a magnet so the normal magnetic effect will do exactly zilch for holding the puddle in place, a magnet will not even have an attraction to red hot steel never mind molten steel. If anything the only effect you are going to get is a lot of spatter and arc blow because the arc will be affected by the magnet but not in any way you would want!
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Old 02-26-2009, 01:13 AM
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Man!! after reading this thread, its incredible the amount of witch-doctory and misconception going on with welding.
Welding upside down is easier than welding vertical, tougher than flat. Plain and simple. There is a wonderful physical property inherent to all liquids called surface tension. The same thing that causes water to bead-up on a wax job. Well, liquid steel has surface tension too and it will help it stick to the base material over head. Contrary to what was stated before , you do not turn down your voltage or amperage to weld over head but rather go UP. about 10 %. So if you are running 26 open circuit volts in the flat for a given piece of material, turn UP to 29 OCV and then run. Balance your amperage and it will run just fine. Shielding gas has nothing to do with the position. CO2 is not the answer to any problem with out of position welds. Use a PUSH presentation to the weld deposition rather than a pull. Lead with the wire/puddle, not the torch or cup.
As far as the magnetism,the steel itself is beyond the magnetic pull. Its a mish-mash of molecular stew getting beat on by electro-magnetic fields and heat induced reorganization. The magnetics come into play with the arc itself and thats where problems come in, usually on reverse polarity ( electrode positive) applications. Arc blow is a problem with larger diameter electrodes or higher amperage applications. If arc blow starts to become an issue, which it may, place your ground BEHIND you and weld away from it. That will usually stop it. If not, place a c-clamp on the piece you are welding and ground to the c-clamp (again, behind your weld joint). That will make a glorified horseshoe magnetic field and isolate the bulk of the field at the ground rather than the point of arc contact. stay within a foot of your weld zone with the c-clamp.
Hope that helps.
BTW, oldred is right. By putting a magnet anywhere near your weld zone, you are asking for spatter burns. You want to keep magnets as far away as possible with welds because the arc responds negatively to magnetic pull and turns into a bull whip, throwing gobs of liquid steel all over the place.

Lee

Last edited by nitrocorsair; 02-26-2009 at 01:19 AM.
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  #49 (permalink)  
Old 02-26-2009, 05:55 AM
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Quote:
Originally Posted by nitrocorsair
Man!! after reading this thread, its incredible the amount of witch-doctory and misconception going on with welding.
By putting a magnet anywhere near your weld zone, you are asking for spatter burns. You want to keep magnets as far away as possible with welds because the arc responds negatively to magnetic pull and turns into a bull whip, throwing gobs of liquid steel all over the place.

Lee
very good information, I have wondered about this very thing, but never knew what to look for ....... thanks for the heads up...

comrade
greg
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Old 02-26-2009, 10:43 AM
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I have spent many years welding very heavy sections, sometimes well over a foot thick, where magnetism is a common problem and have dealt with this by using just about every method in the book. I just can not imagine intentionally placing a magnet near a weld! While it is fairly common to run into magnetism on these heavy parts it is very rare to do so on anything likely to be encountered with the type of welding most people here will be doing so it makes little sense to create a problem where there is none.
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Old 02-26-2009, 10:48 AM
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I have to say,After All my years of being a welder,This is the best one I have ever heard...
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  #52 (permalink)  
Old 02-26-2009, 10:55 AM
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mag weld

old red you sound like a real pro.i guess im not in such a rush to try it.i took a two year course in pipe fitting at 45years old just so i could to tig at my shop although i graduated top of the class i know nothing compared to you guys thanks for keeping me grounded
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