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Definition: EN (European Standard) refers to harmonised standards adopted by CEN, CENELEC or ETSI. They serve to standardise technical requirements within the European single market. EN standards must be adopted by the member states.

Practical relevance: EN standards are frequently the basis for CE marking and conformity assessment. Examples include EN 1090 (steel construction) or EN ISO 15614 (welding procedure qualification). National standards with conflicting content are withdrawn.

Definition: EN 13134 is a European standard for the qualification of brazing procedures for load-bearing steel components. It describes requirements for specimen preparation, testing and ranges of validity. The aim is to demonstrate reproducible brazing quality.

Practical relevance: The standard requires mechanical testing, metallographic examinations and visual inspections. Ranges of validity relate to material groups, filler metals, temperature control and joint gap. It is relevant for safety-critical designs.

Decision-making perspectives:

• Technical decision-makers: Ensuring qualified brazing processes.
• Purchasing/project management: Requiring standard-compliant procedure qualification.
• Science: Analysis of diffusion zones and microstructural changes.
• Insurance/law: Documented qualification record.

Typical testing or verification methods: Tensile/shear test, micrograph examination, visual inspection.

FAQ:

• What does EN 13134 apply to?
• The qualification of brazing procedures on load-bearing steel components.

Definition: EN ISO 15614 is an international standard for the qualification of welding procedures by means of a procedure test (WPQR). It specifies the test conditions, specimen requirements and assessment criteria. The aim is to ensure reproducible welding quality.

Practical relevance: The tests comprise tensile, bend, notched-bar impact and hardness testing as well as macroscopic examinations. The qualified parameter range defines the scope of validity of the WPS. The standard is central to pressure equipment construction and steel construction.

Decision-making perspectives:

• Technical decision-makers: Safeguarding the mechanical characteristic values of the weld seam.
• Purchasing/project management: Binding proof of qualification prior to series production.
• Science: Investigation of heat-affected zones.
• Insurance/law: Standard-compliant process verification.

Typical testing or verification methods: Tensile test, notched-bar impact bending test, micrograph examination.