Product Introduction
Headed welding studs manufactured to ISO 13918 for drawn‑arc stud welding in composite steel‑concrete construction. These fasteners are welded through the profiled metal deck directly to the top flange of a steel beam, forming a positive mechanical shear connection. Once the concrete slab is cast, the studs transfer longitudinal shear forces between the slab and the beam, enabling composite action that increases load‑bearing capacity and structural stiffness.

Material & Mechanical Properties
Fabricated from weldable low‑carbon steel whose chemical composition ensures arc stability and full‑penetration fusion. After welding, the connection meets the tensile and ductility requirements of AWS D1.1 / ISO 14555. The welded stud develops shear strength that exceeds the shank cross‑section, directing any overload into a ductile failure mode remote from the weld interface.

Dimensions & Identification

• Nominal diameters: 10 mm to 25 mm

• Length before welding: 40 mm to 300 mm

• Head geometry: cheese head (cylindrical) per ISO 13918

• Marking: each stud head is embossed with the manufacturer’s identification symbol, providing full traceability to production lot and heat number

Ceramic Ferrules
Each stud is supplied with a cordierite ceramic ferrule. During the drawn‑arc welding cycle, the ferrule surrounds the molten pool, shielding it from atmospheric contamination and shaping the fillet weld. Cordierite withstands the extreme thermal shock and high temperature of the welding process without melting or cracking. Ferrules are removed after the weld solidifies.

Installation & Weld Verification
Welding is performed with a drawn‑arc stud gun, not a resistance spot welder. After the metal deck is placed over the supporting structural steel, the gun lifts the stud, initiates an electric arc that melts the stud tip and a localized area of the beam flange, then plunges the stud into the molten pool — burning through the deck without the need for pre‑drilled holes.
Post‑weld integrity is verified by a visual check of the full‑circle flash and fillet dimensions, followed by a mechanical bend test. An iron mallet strikes the side of the welded stud, bending it to the angle specified by the applicable standard. A stud that remains attached without fracture at the weld joint confirms a sound connection. A stud that breaks off at the beam interface under this shear‑bending force indicates a failed weld and must be replaced.

Application Suitability
Composite floor and roof decks in steel‑framed buildings, bridge decks, industrial mezzanines, wind turbine foundations, and other structures where the structural engineer specifies a shear connection to resist longitudinal shear between the concrete slab and steel beam. The diameter, height, and quantity of studs per beam are determined by the structural design.

Technical Parameters