JOINING

JOINING

1. Permanet joining

   • Soft soldering
     • We use a tin-lead alloy. This is heated with an electric soldering iron, which reaches temperatures of 400°C.
     • Uses: Join tinplate, sheets of metal, brass and electronic and electrical components
   • Hard soldering
     • Brass or copper is heated with a blowtorch to a temperature of 800°C.
     • Uses: Copper and brass; alloys of steel, bronze or cast iron.
   • Oxyacetylene welding
     • An oxyacetylene blowtorch is used which can reach temperatures of over 3000°C.
     • Uses: Sheets of steel in construction and in the shipbuilding and car industries

2. Temporary joins

   • Threaded stay bolts
     • This bolt has grooves at both ends, but the middle section is smooth
   • Screws
     • A screw joins one piece to another where there is a threaded hole. If the screw threads the hole as it is going in, we say it is a self-drilling screw.
   • Nuts and bolts
     • The bolt is inserted through the pieces that need to be joined together. Washers are used so that the pieces don't break and to secure the joint.
   • Keyed joint
     • With a piece of metal called a key, you can join two objects by putting the key in a groove.
   • Splined shafts
     • Two pieces have grooves so that they fit together when joined together .he assembled pieces can rotate.
   • Sliding joints
     • Two objects that are joined together that can move or slide over each other.