How to simulate a "metal welding" (brazing metals) effect

Hi there
In this video tutorial we’re dealing with how you can simulate a “brazing metals” effect ,useful for adding realism in that case there where you want to model metallic joints (bikes’ frames,bicycles tubes,exhaust pipes etc)

Here’s the link to this tutorial :
http://www.youtube.com/watch?v=fZEmz6qLxi8&list=UUKDe8_5_-j7HvyS6p0QLlaA&index=2

Hope you’ll enjoy this!
Peter