Joining Metal

1. Joining Metal Product Design

2. Joining Metal The following areas must be covered for joining metal: • Sheet Metal Joints and Seams • Riveting • Soft Soldering • Spot Welding • Brazing

3. Joining Sheet Metal Joints and Seams 1. Soldered Lap Joint:- A very simple joint relying entirely on solder for its strength. 2.Riveted Joint:- Is a permanent fastening I.e. parts cannot be easily separated and is normally used for fixing metal plates together. 3. Safe/Wired Edge:- Both edge preparations are used to strengthen the edges of light gauge sheet metal articles. They also provide a smooth edge and enhance the appearance of the article. 4. Folded and Grooved Seam:- A permanent joint between two sheets of the same thickness. 5. Spot Welding:- Spot welding is commonly used as an alternative to riveting to join tin plate and light gauge metal. Lap Joint

4. tail body head Joining - Riveting Rivet 1. A rivet is a permanent fastening, I.e parts cannot be easily separated. 2. Made in various diameters and lengths 3. Made from soft and malleable metals I.e. mild steel, copper, brass, aluminium. 4. Shape of rivet head gives name to type of rivet. 5. Rivet consists of three main parts a) head b) body c) tail 6. Rivet allowances Snap or round head - tail length = 1 1/2 x diameter. Counter sunk heads - tail length = diameter Forming a Riveted Joint Cut rivet to length set Close up rivet and plates dolly Begin shaping snap Finish

5. Joining - Soft Soldering • Soldering:- is a method of joining metals, provided no great strength is required, at a relatively low temperature using an alloy. • Equipment:- 1. Solder - an alloy of lead (50%), tin (45%) and antomony (2%). 2. Flux - keeps the metal clean during heating. Breaks down surface tension of solder enabling it to flow. Prevents oxide forming during heating. 3. Soldering Bolt Gas HeatedElectrically Heated Plastic Handle Wooden Handle Copper Bit Mild Steel Rod Flex Heating Element