In this memorandum, the available reports in DMIC which are concerned with welding of metal surfaces in space environments, whether this welding is desirable or undesirable, are reviewed. The phenomenon of surface welding in the space environment is of interest to many for various reasons. Some hope to use the phenomenon for the completion of attachment joints or repairs to spacecraft. Some are concerned because of the possible malfunction of moving components such as bearings, valves, and electrical contacts. However, no effort has been made to correlate and analyze the data that are presented. A section on fundamental studies also is included, along with an annotated bibliography which covers references dealing primarily with lubricants, lubrication, coatings, and test equipment.