Does the fiance(e) visa automatically change to an alien registration card (green card)?
No. After the marriage takes place, the U.S. citizen must contact Immigration and Naturalization Service to change the alien spouse’s status to legal permanent resident. This information is given to the alien fiance(e) upon his/her entry to the U.S. Usually, the petitioner or U.S. citizen spouse will have to file forms immediately to adjust the alien spouse’s status. The usual forms are the Forms I-130 (Petition for Alien Relative), I-485 (Adjustment to Permanent Residence) and I-765 (Employment Authorization).