robots for spot welding

[iconoclast25]

Hi,  I need to know the type of robot which are commonly used for spot welding application.
I also would like to know the ancillary devices which would be necessary.
Thanks

[Admin]

google search before posting

http://images.google.com/images?q=robot%20spot%20welding&ie=UTF-8&oe=UTF-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&sa=N&tab=wi