General Welding Information - Joint Types

Vehicles are assembled by various joining methods categorized as follows:

Mechanical Joint:

Parts are joined by bolts, nuts, rivets, etc. It is necessary to machine the affected parts before for joining.

Chemical Joint:

Parts are glued together. It is usually unnecessary to machine the affected parts before joining.

Metallurgic Joint:

Surfaces to be joined are melted to join them together. Welding falls into this classification. Welding types include: pressure welding, fusion welding, and soldering:


Pressure Welding
This method melts parts together by electrical current and resistance without using filler material while pressure is applied to the joint. Spot welding is a common example.
Fusion Welding
This method melts the parts together using a filler material such as welding wire or rod. MAG and MIG welding are common examples.
Braze Welding
This method bonds two pieces of metal without melting them by using a filler material (brazing filler material) that has a lower melting point than the materials being joined.