Transition joints are bimetallic strips/pad used to facilitate the joining of dissimilar metals by welding. Particularly where those metals cannot be joined by conventional welding processes, and where, if mechanical joining techniques are used, corrosion sets in after a relatively short service life. Their uses are generally found in marine construction, but are equally applicable in other industries where a permanent, maintenance free joint between aluminum and steel is called for.



Increasingly, aluminum is being used in shipbuilding to reduce weight. However, on grounds of cost and durability, it is not normally used for the whole of the hull, which may be mainly steel. With aluminum being used to a greater or lesser degree for structures above the waterline to reduce overall deadweight or to lower the centre of gravity, thus improving roll performance. This is particularly beneficial on RO-RO ferries.