Technical information

Technical information

All the threads and stud flanges are created to DIN EN ISO 13918. The flange is a component part of the welding stud. Its diameter is greater than the external diameter of the stud. During welding, it prevents the arc from affecting the cylindrical section of the bolt, simultaneously increasing the welding area.

 

Weldability of materials

Basic material Stud material
4,8*
Stud material
A2-50*
Stud material
CU Zn 37 (Ms63)
Stud material
Al Mg
Steel to 0.35% C ++ o ++ -
Steel to 0.60% C - o - -
Sheet steel, electrogalvanised max. 30 µ o o ++ -
CrNi steels austenitic o ++ o -
Cu Zn 37 (Ms 63) leadfree o o o -
AlMg3 - - - ++
++ Very suitable, o Sufficiently suitable to Ø 5 mm, - Not suitable for welding,
* Suitable for welding

 

Approved tightening torques (N x cm)

Thread Asp (mm²) 4.8 A2-50 CuZn37 AlMg3
M3 5,03 80 50 60 40
M4 8,78 180 110 130 90
M5 14,20 360 230 270 190
M6 20,10 610 380 450 310
M8 36,60 1500 950 1100 750
According to DVS 0904, related to the offset yield stress (torque). Asp = Cross-section area of the thread

 

Limit tensile force to DIN 18800-1 (without deformation), PT, UT and IT

Material Comment Standard Mechanical properties
4.8 Studs made of non-alloy steels are suitable for welding if there is a small amount of har dening (C < 0.18%). Studs made of machining steels are not suitable for welding. EN 20898-1 Rm > 420 N/mm²
ReH > 340 N/mm²
A5 > 14 %
A2-50 Studs made of rustproof steels are usually suitable for welding, whilst those made of machining steels are not. EN ISO 3506-3 Rm > 500 N/mm²
ReH > 340 N/mm²
Al > 0,6 d
CuZn37   ISO 426-1
ISO 1638
Rm > 370 N/mm²
EN AW-AlMg3   EN 573-3 Rm > 180 N/mm²
NR, d = ASP x fu, b, k/(1,25xym) · fu,b,k = Rm · This data can only supply guide values,as the torque and minimum break load are dependent on the strength (thickness) and stability of the base material.

 

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