When you bond two varying alloys or metals, the outcome will be the metals you call clad metals that can provide your with a lot of functional characteristics that are far better than just using individually the combined metals. You can make clad metals out of tube, sheet, rod, plate, and wire forms. The alloys and metals that come common for engineering use are those that allow you to easily clad them together. Cladding is the best process to use to get specific composite material characteristics that you can never get in just one material.
Bonding of clad metals can be made possible with different process starting from heavy electroplating, casting, heavy chemical deposition, diffusion bonding, co-extrusion, welding, and co-rolling. In the jewelry industry, it is there that you can see the early beginnings of clad metals with its use in jewelry starting with combining the strength characteristics of base metals and the aesthetic appeal of precious metals.
There are basically two kinds of clad metals out there, the overlay clads and the inlay clads.
Inlay clads can give you sophisticated looking clad metals that you have never seen before. An inlay will first be used and then the maker of material will be mixing together cheaper materials such as brass, stainless steel, and copper with the more expensive ones such as platinum, palladium, silver, and gold to make the best results. Such combination assists putting together the properties of precious metals with how you want them as well as the other properties of the other metal to their contribution in heat sinking, welding, and spring.
Going with inlay cladding has been shown to be more beneficial than the use of selective plating. It is only with the process of inlay cladding that utilization of wrought alloy is made possible. This results in getting a more consistent composition out of your clad metals and using different kinds of alloys that cannot ordinarily be plated. By opting for better materials for inlay cladding, there is no doubt that your materials will turn out more dense, more wear resistant, and much harder in comparison to the plated surfaces.
When you say overlay cladding, on the other hand, you are referring to a method that will combine different metal layers and put them into one. This method need not use an filler materials or adhesives as metals are bonded. If the both of these materials are used, bonding can still be attained with extreme heat or pressure. Normally, you can get a double clad made of three layers or single clad made of two layers and even as high as seven layers. There are several industries that can take advantage of overlay clads that are very much capable of being custom-made. To learn more about clad metals, make sure to check here!
For further info: https://en.wikipedia.org/wiki/Cladding_(metalworking)