Strength values of welding elements
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Technical overviewStrength values of steel and stainless steel welding elementsWhich parameters apply to aluminium and brass welding studs?How do correct material data support quality in your production?
Technical overview
|
Designation of welding elements according to DIN EN ISO 13918:2018 |
Welding element materials |
DIN / ISO standard | Mechanical properties |
|---|---|---|---|
|
FD MD PD RD UD ID |
4.8 (suitable for welding) | ISO 898-1 |
Rm ≥ 420N/mm² ReH ≥ 340N/mm² Elongation at break A5 ≥14% |
|
FD MD PD RD UD ID |
A2-50 (suitable for welding) Stainless steel AISI 304 |
ISO 3506-1 |
Rm ≥ 500N/mm² Rp0,2 ≥ 210N/mm² Elongation at break AL ≥0,6d |
| SD | SD
S235J2+N (S235J2G3) + C450 |
ISO TR 15608 DIN EN 10025 |
Rm ≥ 420N/mm² ReH ≥ 350N/mm² Elongation at break A5 ≥15% |
| SD |
1.4301 (X5CrNi18-10) (AISI 304) 1.4303 (X6CrNi18-12) (ASI 305) |
ISO 15510 |
Rm ≥ 420N/mm² ReH ≥ 350N/mm² Elongation at break A5 ≥15% |
|
PS US IS |
4.8 (suitable for welding) | ISO 898-1 |
Rm ≥ 420N/mm² ReH ≥ 340N/mm² Elongation at break A5 ≥14% |
|
PS US IS |
A2-50 (suitable for welding) Stainless steel AISI 304 |
ISO 3506-1 |
Rm ≥ 500N/mm² Rp0,2 ≥ 210N/mm² Elongation at break AL ≥0,6d |
|
PS US IS |
CuZn37 | EN 12166 | Rm ≥ 370N/mm² |
|
PT UT IT |
4.8 (suitable for welding) | ISO 898-1 |
Rm ≥ 420N/mm² ReH ≥ 340N/mm² Elongation at break A5 ≥14% |
|
PT UT IT |
A2-50, A2-70, A4-50, A4-70, A5-50, A5-70 (suitable for welding) |
ISO 3506-1 |
Rm ≥ 500N/mm²-700N/mm² Rp0,2 ≥ 210N/mm² Elongation at break AL ≥0,6d |
|
PT UT IT |
CuZn37 | EN 12166 | Rm ≥ 370N/mm² |
|
PT UT IT |
N AW – Al 99,5 (1050A) |
EN 573-3 | Rm ≥ 100N/mm² |
|
PT UT IT |
EN AW – AlMg3 (5754) |
EN 573-3 | Rm ≥ 180N/mm² |
Standards note: the table refers to the 2018 edition. The current edition is DIN EN ISO 13918:2021-12. Design must use the confirmed properties of the welding elements supplied and the requirements applicable to the application.
Strength values of welding elements describe the mechanical properties of welding elements. They must be distinguished from the load-bearing capacity of the finished welded joint. The mechanical forces a threaded stud or headed stud can withstand permanently after joining depend on factors including material, joint geometry, welding execution and loading. In this technical section, Bolzenschweißtechnik bsk + BTV GmbH provides a verified overview for designers, quality inspectors and production planners in mechanical engineering and structural steelwork. To monitor these loads in accordance with standards, all elements used must meet strict criteria. Detailed regulatory requirements can be found on our information page about DIN standards in stud welding .
Strength values of steel and stainless steel welding elements
The table summarises the key mechanical properties of common fastening elements. For conventional welding studs of strength class 4.8 according to ISO 898-1, for example, the tensile strength (Rm) is at least 420 N/mm² and the yield strength (ReH) is 340 N/mm², with elongation at break of at least 14 percent. For stainless steel, such as the weldable material A2-50 (AISI 304 / 1.4301) according to ISO 3506-1, tensile strength is at least 500 N/mm². These material properties form a basis for design. The load-bearing capacity of the welded joint and the specific loading must also be demonstrated.
Which parameters apply to aluminium and brass welding studs?
Precise load-related parameters are also essential for materials other than steel and stainless steel. Capacitor discharge welding with tip ignition frequently uses welding elements made of brass (CuZn37 according to EN 12166) with a tensile strength of at least 370 N/mm², or aluminium materials. Pure aluminium studs (EN AW-Al 99,5) achieve at least 100 N/mm², while the stronger AlMg3 alloy (EN AW-5754 according to EN 573-3) has a tensile strength of at least 180 N/mm². The relevant material properties must be confirmed for the welding elements supplied. Applicable standards and process-specific DVS technical bulletins must be consulted for the welding process.
How do correct material data support quality in your production?
Correct mechanical material data support design. They alone do not exclude component failure under static or dynamic loading; geometry, weld quality, loading and the required evidence must also be considered. As an experienced partner in special-purpose machine construction and stud welding technology, Bolzenschweißtechnik bsk + BTV GmbH matches equipment technology and welding elements (such as PT or MD threaded studs or internally threaded studs) precisely to your design requirements. Questions about specific elongation values, strength classes for special studs or your particular application in operation? Simply email info@stud-welding.de – the experienced team at Bolzenschweißtechnik bsk + BTV GmbH will be happy to provide individual advice.
