photo credit: Markfive

Design of the bonded joint.

This is the first phase of the entire bonding process, the one that determines the condition and the success of the phases later, and especially the final outcome.

In order to achieve an outcome "excel", you will analyze and define some fundamental aspects that can not in any way be excluded or replaced:

• The analysis of requirements;
  Performed in a critical manner, allows to identify and define all those variables that can affect the final result, drawn from the analysis of some fundamental aspects, such as the junction area, the size and shape of the surfaces, the environmental factors in which the coupling is involved, the stress (compressive, tensile, peeling), the size of the surfaces, the surface finishes.
• The classification of the joint;
  Allows you to determine the allocation of the Class of Criticality of the joint, usually identified in three classes that move in opposite inversely proportional to the damage that can result in failure;
• The environmental conditions;
  Knowing the environmental conditions on the use of the joint, allows focusing on the design, facilitating the choice of the adhesive and its qualification.
  For an assessment of some environmental effects we can see the UNI EN ISO 9142.
• The analysis of the materials to be joined;
  Is used to check for consistency with the requirements, compatibility with other phases of the process including adhesives, through the analysis of physical and mechanical characteristics.
• Knowledge of the adhesive;
  Knowing the characteristics physico, behavior, applicability, mechanical strength, their responsiveness to specific rules, the observance of health and safety, allows you to properly design and develop a joint production process (application - drying) suitable to achieve requirements.
• Definition of the joint
  Activities defines the geometric shape of the junction and its requirements into account all the results of analyzes carried out, whose graphical representation is given in EN ISO 15785.

Designated the joint, defined its requirements, we can move on to the next stage of "Coordination of the bonding process."

Umberto Bartolini

Organization-Qualita.com

About the Author: Umberto Bartolini

Umberto Bartolini, married with two beautiful children, has worked for over twenty years in the railway sector organizations, where he still holds the role of Quality Manager at Spa Ciesse Passionate about quality issues, in his spare time he enjoys writing articles to special themes. Specific skills: Development of quality systems and documenting system in accordance with EN ISO 9000 and IRIS (International Railway Industry Standard), management and monitoring of processes, development and qualification of special processes, development of statistical techniques for control of the entire production chain. Management and execution of internal audits external. Activities of Quality Control and Quality Assurance. Development and management of test series, type and FAI (First Article Inspections). Operating Systems and Management known: SAP, AS/400, Gamma Enterprise, Autocad, and main applications in the Windows environment.

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