Final answer:
Plastics are joined using welding, bonding, mechanical fastening, and fusion. These methods ensure the durable assembly of plastic components in manufacturing.
Step-by-step explanation:
Four basic ways plastics are joined include welding, bonding, mechanical fastening, and fusion. These methods are essential in the assembly of plastic components in various industries. Welding and fusion involve melting the plastic to create a solid joint, while bonding usually requires adhesives.
Mechanical fastening involves using hardware such as screws or rivets. Understanding these methods is crucial for the effective manufacturing and recycling of plastic products.