Welding Magnet
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do electromagnets decrease its magnetic force if it is welded to another metal o increase its surface area?
2 metals: one an electro magnet, the other a metal plate; when joined by welding, does it retain its magnetic power?
Assumming the plate is ferrous, similar in permeability to the core of the electromagnet, it will redistribute the lines of flux a bit, which instead of leaving the end poles of the core, will follow the plate out some distance then go through air to get to the other pole . This may be desireable or not, depending on your application, in particular where you want the lines of flux to flow though. Think of flux flow as similar to current flow, where ferrous and other magnetic materials are a very low resistance, and air and all other materials as a very high resistance. Your plate, if ferrous, provides a small amount of parallel low-resistance pathway for the flux, increasing the total flux for a given magnetic force. Flux density at the opposite end, the end not welded to a plate, will increase slightly.
If the plate is non-ferrous, brass, whatever, the magnetic field will not be affected, since such materials have the same low permeabilty (high resistance to flux flow) as air.
You don't mention your goal. If it's simply for mounting purposes, I'd say use a non-ferrous plate to avoid altering the the magnetic properties.
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