a Plasma Forcefield. It is made of a stream of plasma. This is the video of a piece of solder melting at about 621.43 degrees Fahrenheit (about 327.46 degrees C). The actual plasma is over 10000 degrees. it looks a lot like the forcefield's on star wars.
For those who dont know, solder is a metal alloy:
http://en.wikipedia.org/wiki/Solder
Watch video Plasma Forcefield melting metal online, duration hours minute second in high quality that is uploaded to the channel Aedazan 18 July 2008. Share the link to the video on social media so that your subscribers and friends will also watch this video. This video clip has been viewed 557,468 times and liked it 1.5 thousand visitors.