1. Executive Summary Puddle welding is a specialized arc welding technique primarily used in structural steel erection and composite construction. Unlike conventional welding that joins two pieces along a seam or at a butt joint, puddle welding is used to attach shear studs or reinforcing bars directly to the flat flange of a steel beam without the need for a pre-drilled hole. The process relies on melting a defined area (a "puddle") of the base metal, into which a cold stud or bar is plunged, creating a fusion bond. This report defines the process, its mechanism, applications, advantages, limitations, and quality control requirements. 2. Definition and Core Principle Puddle welding (often referred to as stud welding in a specific context or puddle arc welding ) is a manual or semi-automatic arc welding process used to weld a metal stud, rod, or reinforcing bar (rebar) onto a flat steel surface.
An electric arc is struck between the end of the stud (or a consumable ferrule) and the base metal. The arc melts a localized pool (puddle) of base metal and the tip of the stud. The stud is then forcibly plunged into the molten puddle, and the arc is extinguished. The molten metal solidifies, forming a full cross-sectional fusion weld. what is puddle welding