Arc welding is a type of welding using electricity to heat and fuse metal together. In order to control the process the heat must be controlled by varying the current. MIG (Metal Inert Gas) welding uses an inert cast to protect the weld from the air at extreme temperatures during the welding process. You can find a more detailed explanation of <a href=" http://www.trade-equip.co.uk/blog/?p=969 ">Arc Welding here</a>
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smaw welding is sheilded metal arc welding
Gas Tungsten Arc Welding Gas Metal Arc Welding Flux Cored Arc Welding
SAW welding is a type of arc welding while ERW welding is spot or seam welding. SAW stand for submerged arc welding while ERW stands for electric resistance welding.
There are far more than 5 types or processes of welding. Currently the American Welding Society (AWS) states that there are more than 80 different welding and joining processes. However, some of the common welding processes include shielded metal arc welding (SMAW), gas metal arc welding (GMAW), gas tungsten arc welding (GTAW), flux cored arc welding (FCAW), and oxyfuel gas welding (OFW).
shielded metal arc welding does not required any shielding gas