Overview
ABSTRACT
The welding of metal materials for assembly can result in modification of the isostatic lines and the local mechanical behavior of the material through the ties made.
This article specifies the methodologies applicable to the calculation of assemblies subjected to variable loading, and the verification of the harmfulness of the defects outside the usual manufacturing tolerances. This presentation, which particularly concerns steels and aluminum alloys, and which makes extensive use of normative documents from the field of construction, endeavors to be complete, explanatory and up-to-date.
Read this article from a comprehensive knowledge base, updated and supplemented with articles reviewed by scientific committees.
Read the articleAUTHOR
-
Alain MICHEL: CNAM and ESSA engineer - Expert, former lecturer - Welding Institute Industry, Villepinte, France - Higher School of Welding and its Applications, Yutz, France
INTRODUCTION
A large proportion of mechanical parts, including those whose function is to transmit motion, are subjected to variable stresses during operation, which exposes welded assemblies to a mode of failure involving progressive fatigue cracking.
The dimensioning of a welded assembly under variable load is therefore the final stage in the design of a mechanical part. This verification, which is often neglected or even ignored, is frequently the cause of premature failure in service, with serious consequences for the companies that manufacture and use the damaged equipment.
This article discusses the justification for the design of welded assemblies subjected to variable loads during the design phase of a structure, as well as the verification of the suitability for use of this same structure in service, on which non-destructive testing reveals welded assemblies with progressive defects that are then identified and characterized.
It is essential to note that the article cannot replace a dimensioning code. Its main objective is to specify the methodologies that can be used for analyses relating to fatigue on the one hand, and the harmful effects of defects on the other, in the context of the construction of welded structures for mechanical use.
At the end of the article, readers will find a table of abbreviations and symbols used.
Exclusive to subscribers. 97% yet to be discovered!
Already subscribed? Log in!
KEYWORDS
steel | fatigue | aluminium alloys | mechanical engineering | welding | defect | welded joints | Joining (welding)
Welded mechanical parts
Fatigue design of welded joints
Article included in this offer
"Mechanical functions and components"
(
201 articles
)
Updated and enriched with articles validated by our scientific committees
A set of exclusive tools to complement the resources
Bibliography
Exclusive to subscribers. 97% yet to be discovered!
Already subscribed? Log in!
