Adhesives, or glue, are a chemical substance then when dried creates a bond between two surfaces. Adhesives need to be carefully matched to the materials and use situations. Modern adhesives are extremely strong and are designed to be used in very technical situations (high heat, cold, or extreme conditions)

For more information about adhesives and their selection, see the BHA design Website

Welding and brazing are methods for joining metal to metal. However, their processes and applications are different.

Welding uses high heat to join two similar metals together. The bond is very strong. The high heat results in greater energy used and can deform the metal. Great skill and specialized equipment is required.

Brazing uses a lower heat and a filler metal to join two parts. As such, it is possible to join two different metals together. The lower heat used in brazing means less energy is used and the two metals are less likely to be deformed.

Permanent fasteners are nails or rivets that bind two or more pieces together.

These include fasteners that can be used and removed. There are a range of temporary fasteners, each designed fro specific materials and use cases.