content: Galvanic corrosion, and yes corrosion would occur if the wrong metals are welded together and placed in a poor environment. However very few designers would make these mistakes as it is a well known and managed issue. Corrosion would not occur within the weld itself, but along its periphery at the non-bonded interaction surface of the two metals (hence the reason your car battery terminals get shit on them but you can clean the terminals off and still have something to mount your electrodes to). Per the index, you can determine what metals are allowable for use with other metals.