Welding This process uses high 1. to join metals or thermoplastics.
Most common types of welding are: • fusion welding: it can be 2. (between similar materials), which is the melting of the 3. of the workpieces, or dissimilar (between different alloys), which involves the melting of a filler 4. or wire • electric 5. welding: uses a welding 6. that melts •7. beam welding: laser beam arcs produce heat that melts material and fills 8. • plasma welding: 9. arc between the electrode and the material
Brazing When the filler metal at melting point is 10. 450°C but below melting point of base metals.
11. When the filler metal at melting point is below 450°C.
Adhesive 12. When two metal surfaces are joined by a layer of adhesive material.
14. Write the name of each process according to the description.
1. The edges of two workpieces of similar materials are melted together: 2. In the process, a consumable welding electrode is used: 3. The metal surfaces are joined together by means of a layer of adhesive material: 4. To be joined together, two different materials need a filler rod during the welding process: 5. It uses a filler metal which melts at a temperature below 450°C: 6. This process uses laser that produces heat that melts the material and fills the cavity: 7. It uses a filler metal which melts at a temperature above 450°C: 8. This type of welding produces high heat concentration that enables precise high-speed welding:
15. Read the text and complete the table with the missing information.
Inert Gas Welding Inert Gas Welding refers to welding processes that use inert gases as a shielding medium to protect the weld spot from atmospheric contamination. There are two types of gas welding: •MIG (Metal Inert Gas) is a process that uses a consumable wire electrode fed continuously through a welding gun. The arc melts the wire and base metal, creating the weld. An inert or semi-inert gas (like CO2 or a mix of argon and CO2) shields the weld from contamination, for this reason it is rarely used outdoors where the air is unstable because of wind. It can be used on stainless steel, mild steel, aluminium, and plastic and it is suitable for thicker materials and high-production environments. •TIG (Tungsten Inert Gas) is a welding process that uses a non-consumable tungsten electrode to create the weld. The arc is protected by an inert gas, typically argon or helium, to prevent contamination. It requires a filler rod for thicker materials, but it can also weld without filler metal. It produces high-quality, precise welds and is used to weld copper, titanium, steel, aluminium, and even two different metals.
Type: MIG Electrode: 1. wire Gas: CO2 or mix of 2. and CO2 Materials: Stainless steel, 3. steel, aluminium, 4. Characteristics: Suitable for 5. materials, 6. environments, not used 7.
Type: TIG Electrode: Non-consumable 8. Gas: Argon or 9. Materials: Copper, 10. , steel, aluminium, different metals Characteristics: High-quality, precise 11. , can weld without 12. metal