Pressure Vessels

Each pressure vessel that we manufacture is per the American Society of Mechanical Engineers (ASME) code. As a leading ASME pressure vessels manufacturer, our specialty lies in working with a variety of alloys, pressures, & designs to meet your custom requirements. More »

Weld Overlay and Clad Vessels

Our weld overlay and clad vessels are fully code-compliant. We use our advanced welding techniques to their full capabilities to offer you the finest overlay/clad components and pressure vessels. More »

High Pressure Vessels

We hold the American Society of Mechanical Engineers (ASME) U, U2, and U3 stamps, and have the capabilities and resources to manufacture ASME high pressure vessel to your exacting specifications. More »


We hold the American Society of Mechanical Engineers (ASME) U, U2, U3, PP, & S stamps, and have the capabilities and resources to manufacture autoclaves to your exacting specifications. More »

Heat Exchangers

We specialize in the design, engineering, and fabrication of Shell and Tube Heat Exchangers, including thermal calculations. All of our units are built in strict accordance with the latest edition and addenda of the A.S.M.E. Code, Section VIII Division 1, 2, or 3 and T.E.M.A.” More »


The Principles of Weld Overlay or Metal Cladding

The world of metallurgy involves numerous fascinating and innovative operations in order to add to the productivity and to improve efficiency. Metal cladding or weld overlay is a similar process that is commonly used in several metal working processes. When two or more metals of specific characteristics are applied on a base metal, the process is called weld overlay or cladding. The purpose of the process is to add desirable qualities to the end product or to restore the original dimension of the element.

A general overview
weld overlay

Some tend to get confused between welding and weld overlay, and hence it is important to know the difference. General welding simply means joining two pieces of materials together; whereas, weld overlay signifies adding of corrosive resistant and durable metallic layers onto the parent layers in order to achieve improved operational efficiency of the finished product. As stated above, weld overlay is majorly done to provide excellent resistance against corrosion, wear and tear of the material; however, it is important to know the other aspects of the process. Apart from oil and gas industry where it is most commonly used, weld overlay is applied to many components like pipes, valves, fittings and vessels.

How is Cladding Done and Why is It Done?

When 2 or more dissimilar metals are bonded together, it is called cladding, which is often done by ejecting two metals through a cast as well as rolling and pressing sheets, under high pressure and temperature. There are certain metals that are most preferred for this operation and these are steel, aluminum, titanium, bronze and copper. Metals that are to be involved in the process are chosen based upon certain factors like application requirements, property of the metals, durability and strength of the metals, appearance and cost-efficiency.

Metal cladding, which is ideally a type of exterior cladding, provides flawless protection to the exterior or interior of a construction. Apart from that, it also improves the texture and appearance of the particular structure. Hence, metal cladding has 2 major purposes to fulfill, which are to provide typical strength, durability and protection against corrosion, and to increase the aesthetic versatility of the construction or structure. Besides the typical usage of cladding, the process is also used for roofing. Wood cladding, metal cladding and stone cladding are the most commonly used processes that are required for adding strength and beauty to homes and constructions.

When it comes to weld overlay, trust Didion’s Mechanical for its quality, safety, performance, design and superior manufacturing processes. The company takes every measure to deliver the best quality and highly efficient and fully code-compliant weld overlay or clad vessels.

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