Where is a plug weld used?Ī plug weld is typically used in situations where it is not possible or practical to make a butt weld, such as when joining two pieces of metal that are not perfectly aligned. When used properly, they can provide a strong, reliable join between two pieces of metal. Plug welds are an essential part of many welding applications. In GTAW, a tungsten electrode is used to create the arc, and a separate wire is used to provide the filler material. In SMAW, an electrode is used to provide the filler material and create the arc. Plug welds are typically made with an arc welding process, such as: Partial penetration plug welds only extend partway through the thickness of the metal. Full penetration plug welds extend all the way through the thickness of both pieces of metal being joined. There are two main types of plug welds: full penetration and partial penetration. Plug welds are used to join sheets or plates of metal together, as well as to join tubing or pipes to flat surfaces. The hole is usually drilled slightly larger than the diameter of the electrode used for welding. A plug weld is a circular weld made through a hole in one member of a lap or T joint.
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