Can Different Metals Be Welded Together?

Welding metal is a common process used in many industries, from construction to manufacturing. Welding two pieces of the same metal together is relatively easy, but many people wonder if different metals can weld together properly. The short answer is yes, but the process requires some careful consideration. We’ll explore the process of welding different metals together, including the factors you must take into account and the necessary techniques you must apply.

Factors To Consider When Welding Different Metals

As you go about combining different metals, it’s important to consider several factors to ensure the materials are compatible enough to yield a durable result. Mixing metals can cause problems if the materials differ too widely when it comes to certain properties. To combat this, you need to choose the right welding process and filler material. Below is a more detailed breakdown of important factors to consider.

Melting Point

The melting point is the temperature at which a solid metal turns into a liquid. When welding two metals together, you need to be aware of their melting points because they can have a sizable impact on the welding process. If the two metals have a significant difference in melting points, you may run into problems with one metal melting before the other, causing an uneven weld. Because of this, you must choose a welding process that can handle the temperature ranges of both metals.

Thermal Conductivity

Thermal conductivity is the capacity of the metal to transfer heat. The conductivity of metal tends to vary widely, and the heat flow on one side of the joint could be greater or less than the other side. Avoid welding techniques that use high heat inputs since the heat can lead to the distortion of one metal. As is the case when you have different melting points, differing levels of thermal conductivity can leave you with a warped or ineffective result.

Expansion and Contraction Rate

Joining two metals causes them to expand, sometimes at varying rates. The expansion rate of each metal is essential to consider when choosing a filler material. The right filler helps ensure the metal doesn’t crack once welded. Alternatively, you can try to apply an intermediary material that is more suitable for both metals.

Welding Techniques for Different Metals

Now that you know whether you can weld different metals together, it’s time to dive into some of the techniques to keep in mind. There are various welding techniques for different metals, and the technique you choose often depends on the type of metal you’re welding and the method's strength. Some common approaches include TIG, MIG, and stick welding. They each have their pros and cons, so it's important to choose the appropriate option. But, in general, TIG is typically used to weld aluminum, while MIG and stick welding are best for welding steel.

While welding different metals is possible, it takes time and effort to ensure a strong and long-lasting bond. If you aren’t well-versed in this process, it can feel like a daunting task. Swisher’s contract manufacturing welding solutions take some of that stress off your shoulders. We have decades of experience helping companies craft their ideal products, often working with a diverse range of materials. Reach out today to learn how we can help you.