Choosing the correct filler metal for your project is just as important as properly executing the weld itself, which is why Central Wire offers forty grades of welding wire across three different material types. This broad selection allows you to choose the ideal material for your application and metal composition to ensure strong and secure bonds. If you are just starting a project and you are not sure which welding consumable to use, or if you have ever wondered what filler metal actually is, take a moment to read the following article before visiting our welding wire products page.

What is filler metal?
gen4 alloysukFiller metal, also known as welding wire, is a length of wire used during the welding process to secure metal joints. Filler metal is available in a variety of different configurations, including rods and reels, which meet the individual needs of MIG, TIG, and SAW welding procedures. MIG welding, for example, typically relies on wire from reels, while TIG welding typically relies on wire from rods. Before selecting a specific material, you will first need to know which type of welding your application requires.

How does it work?
Filler metal requires heat exposure in order to melt. That heat is generated by the welder’s electrical arc, which not only causes the filler metal to pool into a puddle or bead, but also warms the work piece surface. Once melted, the liquefied filler metal can flow between cracks and edges, filling in any gaps between the work piece and its adjacent surfaces. As the two pieces cool, the filler metal joint bonds them together for a strong hold.  

If you are looking for more information about welding procedures and recommendations, check out our previous blog post, Three Tips for Getting the Perfect Stainless Steel TIG Welds. There you will learn about choosing the correct Gen4 alloy for your specific material, controlling the flow of your filler metal puddle, and back purging your project to protect your welds against corrosion.

To see our full range of welding wire alloys, visit the alloys page on our website, or go to