Technical Information

Technical information to make your welding technology even safer

Stud welding in accordance with DIN EN ISO 14555

The drawn arc stud welding is a press-welding-technique. An arc is drawn between the stud and the workpiece, melting some of the metal on both parts which will then be joint by slight pressure. To obtain excellent welding results is not only a question of the right base material and steel grade, the surface conditions and the welding equipment. Electrical processes during the mechanical movement must as well be coordinated.

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Safe stud welding in workshops and on building sites...

The drawn arc stud welding is a press-welding-technique. An arc is drawn between the stud and the workpiece, melting some of the metal on both parts which will then be joint by slight pressure. To obtain excellent welding results is not only a question of the right base material and steel grade, the surface conditions and the welding equipment. Electrical processes during the mechanical movement must as well be coordinated.

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Drawn arc stud welding - thin, coated sheet metal

For stud welding onto thin sheet metals (thickness of about 0,5 - about 2,75 mm) only welding processes causing minimum penetration are suitable, i.e. studs up to 8 mm diamter, mainly diameters of 3 to 6 mm will be used. In serial-production, especially in mass-production (i.e. "white goods", componente for vehicles) coated sheet metals are more and more in demand

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Stud welding in building construction

All KÖCO welding studs are made from materials suitable for stud welding. Dimensions and design of our standard products conform to DIN EN ISO 13918, any non-standard products supplied will be produced to correspond to the norm. If you wish to use a type of stud other than those listed, please send us your enquiry and consult our specialists about your welding task. KÖCO welding studs are available in different materials. Upon request the properties of each can be documented by test report 2.2 or inspection certificate 3.1 or 3.2 (EN 10204).

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Welded-on Shear Connectors in accordance with Eurocode 4

Shear Connectors according to DIN EN ISO 13918 are for example used in bridge-building. They form the joint between the steel beam and a concrete place, which both operate together. This offers advantages by its compact and solid construction, simple fire-protection by concrete-lined chambers and a fast welding of the shear connectors. Relevant norms and standards, especially the Eurocode 4, form the base for calcuation and production.

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Advanced quality assurance in drawn-arc stud welding

For many years, drawn-arc stud welding has been an well estabilished process for welding shear connectors in composite construction and for producing steel components in solid construction. The outstanding advantages are high efficiency of a good stud weld is higher than that of either the stud of the work piece material. The rules for inspection and testing of stud welds are laid down in the relevant norms and leaflets (DIN EN ISO 14555, DVS leaflet 0902, DVS leaflet 0904). However, most of these tests (bend test, radiographic test, macro examination) are destructive, and can therefore only be carried out on random samples. A complete proof of weld quality for each individual stud is not possible by these methods.

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KÖCO - Composite construction

An outstanding feature of efficient, innovative structures is very often an ideal combination of various different building materials. The favourable combination of steel, with its high tensile strength and ductility, and concrete, with its high compressive strength and good resistance to corrosion, has long been recognized in structural concrete construction. With the method of composite construction it is now possible to combine the positive features of steel construction and structural concrete, without having to accept the drawbacks. This means that a steel skeleton structure is combined with concrete parts so that a joint bearing effect is created. The steel beams bear the tensile forces, while the concrete bears the compressive forces and provides fire protection.

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