why is the formula for aluminum fluoride AlF3?
Better let him know what he's getting and give him some choice(Aluminum requires inert gas to keep it from burning in air when heated to welding temperatures.) There's a lot of variety, and different jobs need different weldersHe knows what he needs and we don't- How about a gift certificate.
Talk to your local weld shopThe guys there are all excellent welders and most teach on the sideThey will be able to help you within your budgetand the husband will be none the wiserYou may get them to guarantee a return of your money if he isn't happy with what you choosewelders can be finicky about their tools.
TIG is the best welder for aluminumI doubt your budget will be high enough to cover one thoughA stick welder can do aluminum, but not as well as TIGA MIG welder can also do aluminum, but you need a special gun and gas connectionTo be honest, since you don't know much about welders, don't buy onePerhaps a card with an offer to let him buy one would be bestWelders know what they want and all the features.
An aluminum ion has a charge of +3A florine ion has a charge of -1Three florine ions and one aluminum ion make one molecule of ALF3, which is electrically neutralIf you made AlF2, it would have a charge of +1, and it would bond to something that has a negative 1 chargeWhy is one +3 and the other is -1? The number of electrons in the valence shells.
