25-08-2017, 09:32 PM
MAKING AN ALLOY SOLDER
Theory :
Soldering is a process in which two or more metal items are
joined together by melting. The properties of a metal can be
changed by alloying.
Procedure :
1. Weigh 1 gm each of lead and tin. Put the lead into the
crucible, but keep the tin to one side.
2. Put the crucible onto a pipe clay triangle. Make sure that it is
stable on a tripod and mat.
3. Heat the crucible strongly with a Bunsen burner until the lead
is molten. Add a spatula of carbon powder to the top of it to
prevent a skin forming.
4. Add the tin and stir with a spatula until the metals are both
molten and thoroughly mixed.
5. Move the Bunsen away from the tripod and put it onto a
yellow flame. Wearing thermal protection gloves, pick up the
crucible using the tongs, and pour the molten metal into the
cast or onto a ceramic tile.
6. Let it cool down completely.
7. Check the hardness of alloy by scratching it.
8. Check the melting point of an alloy.
Result : The properties of an alloy are better than pure metals.