tag:blogger.com,1999:blog-131675302011-12-13T19:56:59.842-08:00Welding processes, structural welding design, welding metallurgy, fracture, and fatigue.Expert Witnesshttp://www.blogger.com/profile/07900398154407647098noreply@blogger.comBlogger11100tag:blogger.com,1999:blog-13167530.post-1117035868799999052005-05-25T08:43:00.000-07:002005-05-26T07:28:47.533-07:00A welding arc is formed when a fairly high current (10 to 2000 A) is forced to flow across a gap between two electrodes at relatively low voltage (10 to 50 V). A welding arc is intensely hot with temperatures exceeding 30000°C and forms a concentrated heat source suitable for melting most metals rapidly. The intense heat of the welding arc causes the filler metal to melt and when added to the locally hot melted workpiece, it forms the weld fusion zone. Its subsequent freezing (solidification) produces the bond (weld) between the workpieces. Arc we~ng processes do not require application of pressure to cause fusion. <br /><br /><img src="http://www.avdov.ca/Welding/Fig1_2.gif" alt="AWS Welding Handook, Vol.1" /><div class="blogger-post-footer"><img width='1' height='1' src='https://blogger.googleusercontent.com/tracker/13167530-111703586879999905?l=weldingengineer.blogspot.com' alt='' /></div>Expert Witnesshttp://www.blogger.com/profile/07900398154407647098noreply@blogger.com5