WELDING

Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing coalescence. This is often done by melting the workpieces and adding a filler material to form a pool of molten material (the weld pool) that cools to become a strong joint, with pressure sometimes used in conjunction with heat, or by itself, to produce the weld. This is in contrast with soldering and brazing, which involve melting a lower-melting-point material between the workpieces to form a bond between them, without melting the workpieces.

Welding is one of our major in our course, we only have one project in our major and that is a sink or scope for a rice, we only choose one and our lab choose the sink that is made of aluminum. i dont have any procedure listed in my notebook but I've searched it and i will post it here.

INSTRUCTIONS:

1. Step 1

   Determine where you want the sink, and the style, such as pedestal, vessel, or integral.

2. Step 2

   Find a mold in the shape you want for your kitchen or bathroom sink. These can be found in specialty and construction shops. The mold is usually made of foam. Take measurements beforehand so you'll know how big you want the sink to be.

3. Step 3

   Choose a color for your sink. You will mix the liquid coloring into the concrete when preparing the mixture.

4. Step 4

   Mix the concrete. Be sure to purchase stiff concrete and then add one and a half gallons of water per cubic yard in order to make the concrete smooth. Add the liquid coloring.

5. Step 5

   Cover the mold with mixed concrete. Apply by hand and then smooth it out with a trowel. Wait for the concrete to harden. With a vessel sink there will be a small mount placed above the counter but underneath the actual sink. Put silicone around the bottom of the sink to prevent water from remaining underneath sink. With a pedestal you will need to add the mount under the sink but above the stand it sits on. An integral mount is under the counter where it is not in plain view. The integral is the most common type of kitchen sink, fitted into place within the counter top.

http://http://www.ehow.com/how_4540526_make-concrete-sink.html