Fusing is simply melting glass pieces together in a kiln. Fusing also includes the shaping of fused glass. The purpose of fusing is to combine individual pieces of glass placed either beside or on top of each other into a solid final piece. 
When you heat glass it softens. Increasing the heat will allow the glass to become fluid and flow together. When glass is heated and cooled properly, the result is a fused piece of glass that is solid and unbroken. Not all glass can be fused together, it has to be compatible. Glass expands when it is heated and contracts when it is cooled. In order to fuse pieces of glass together they must expand and contract at the same rate, so that the glass does not crack.
Slumping uses heat to bend or shape the glass. Often slumping is accomplished by using molds, heating the glass until it drops into the mold. You can also slump glass over a mold to create wavy sides. This is called draping.
Want to learn more? Beginner Fusing Workshop-Thorndale, ON
May 23, 2009; 9 am – 4 pm
Design and make 2 - 4" tiles in this fusing workshop. Learn the basics of fusing including kiln programming, glass compatibility and fusing cycles. Work with glass frit, stringers, iridized and dichroic glass. Projects will be available to pick up one week after the class. All materials and supplies are included. Please bring safety glasses if you have them, suitable shoes for standing and a bag lunch.
Cost is $75, plus PST.
http://www.trickettglass.ca/
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