Posted by admin on Wednesday, October 8, 2008 · Leave a Comment
im wondering what happens if you MIG weld aluminum with the correct wire but without using a shielding gas? Would it just be extremely messy or does there HAVE to be an inert gas flowing for it to bond?
welding reaches high enough heats that the oxygen and hydrogen, and nitrogen that naturally occure in our atmosphere will combine and or otherwise interfere with the re-solidification of the molten metal. This will completely destroy the new molecular structure and there will be no strength in the new metal. All welding uses some form of preventing the atmospheres oxygen,nitrogen, and hydrogen from effecting the alloy structure. Other elements can also be combined in the chemical reaction if your environment or your project are not clean. All metals oxidize on their surface. That means combine with oxygen. It is the process we call rust when refering to iron which in the case of iron never stops rusting until it rusts away. for the most part all other metals oxidize on their surface and stop. this is what gives their great protection and helps in deciding their use,as with aluminum. You can create environments that will cause thsese other metals to continue to oxidize as with electrolosis, but that is getting more complex. SOO with aluminum it is a good idea to brush the oxidation layer off the surfaces to be welded so this oxidised aluminun does not become a source of contamination in the new weld metal. It is recomended to use a clean stainless steel bristle brush as an iron brush can contaminate. Brushing can generally last for many hours even days but you can see the dull color re appear as it oxidizes over time. Another comon source of oxygen and hydrogen is water. That is what the purpose of low hydrogen electrodes is, though these are not used in aluminum. The military builds the aluminum hulls for the bradley and other vehicles in San Jose partly because the relative humidity is best for mig welding aluminum there. so you can see the concepts can become conflicting. Always use argon with aluminum. Argon can be mixed with small percentages of helium too.
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