Technical data for welding studs
Non-alloy structural steel:
| KÖCO non-alloy structural steel welding studs are manufactured from S235 according to EN 10025:2005 with more stringent requirements for carbon content, degree of purity, grain size and surface properties. This makes the material ideally suited for stud welding. Through cold forming the material’s tensile strength and yield strength are enhanced and a favourable grain structure is also achieved. |
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| For threaded studs, pins, tapped studs and similar products, we guarantee mechanical properties according to DIN EN ISO 898-1, property class 4.8.: |
Tensile strengthRm ≥ 420 /mm² Yield strengthRel ≥ 340 /mm² Elongation A5 ≥ 14% |
| We supply shear connectors manufactured from S235J2+C450 according to EN 10025:2005 with the following mechanical properties: Steel construction components with welded-on KÖCO shear connectors have been approved by Deutsches Institut für Bautechnik (DIBt, German Institute for Building Engineering) under European Technical Approval ETA- 03/0039 dated Nov.18, 2008. |
Tensile strengthRm ≥ 450 N/mm² Yield strengthRel ≥ 350 N/mm² ElongationA5 ≥ 15% |
Stainless steel:
| We supply KÖCO threaded studs, pins, tapped studs and similar products made from A2-50 according to DIN EN ISO 3506-1. KÖCO welding studs made from stainless and acid-resistant steels such as 1.4541, 1.4571, 1.4401, 1.4404 in various property classes are available upon request. |
Tensile strengthRm ≥ 500 /mm² Yield pointRp0,2 ≥ 210 /mm² ElongationA5 ≥ 25% |
| We supply stainless steel shear connectors made of 1.4301 in accordance with EN 10088:1995 with the following mechanical properties: Stainless steel construction components with welded-on KÖCO shear connectors have been approved by Deutsches Institut für Bautechnik (DIBt, German Institute for Building Engineering, under European Technical Approval ETA-03/0040 dated Nov. 18,2008. Heat- and scale-resistant KÖCO welding studs are manufactured from 1.4713, 1.4742, 1.4762, 1.4828, 1.4841, 2.4851 or 2.4856. Other materials are available upon request. |
Tensile strength Rm 540-780 N/mm² Yield point Rp0,2 ≥ 350 N/mm² 
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More Informationen
- Stud dimensions:
Generally, the nominal length is the length of the stud “after welding”. The studs delivered are 1 to 5 mm longer than their specified nominal length (except KÖCO KKS boiler tube studs and KÖCO KHS concave pins). This enables the welding parameters to be checked by measuring the stud length after welding. - Threads:
The threads of KÖCO studs are cold rolled and manufactured in accordance with DIN 13-20, tolerance 6g. Nonstandard threads are available upon request. - Flux:
KÖCO studs for welding with ceramic ferrules are provided with an aluminium tip as required by the welding process, to facilitate the ignition of the arc, to stabilize the arc and to deoxidize the welding pool. The correct amount of flux used is an essential factor in obtaining perfect welding results. - Surface protection:
Unless specified otherwise, KÖCO welding studs are delivered uncoated. The manufacturing process requires surface coating of the wire, which cannot be removed from the stud shank but does not impair weldability. The codes for materials and types of surface are given in the last three digits of the article number, according to the following table (excerpt):
In the case of zinc-plated studs, the zinc coating is removed at the welding tip to prevent contamination of the welding pool. - Ceramic Ferrules:
In stud welding with ceramic ferrules each ferrule can be used only once. The ferrules required for welding are generally included in the delivery of the studs. Ceramic ferrules are not available without studs. - Weld collar:
In the course of stud welding a weld collar is formed where the stud is joined to the work-piece. Its dimensions depend on the welding parameters as well as the ceramic ferrule used. In this area threads, for example, cannot be utilised. - Ordering example:
KÖCO threaded stud PD M 20 x 100, material 4.8, weldable, uncoated: Article No. 001-0487-001, ceramic ferrule PF 20.
In case of other materials or surface coatings the last three digits of the article number must be changed as shown in the table above.
