What is Endurance Limit in Welding?

Endurance limit is the maximum stress that a material can support indefinitely under variable and repetitive load conditions. In welding, the endurance limit is often referred to as the “fatigue strength” or “fatigue limit.”

  • The endurance limit of a weldment is usually lower than that of the base metal.
  • This is due to the fact that weldments are typically subjected to higher levels of stress than the base metal.
  • As a result, weldments are often more susceptible to fatigue failure than base metal.

There are several factors that can influence the endurance limit of a weldment, including:

  • The type of welding process used.
  • The type of material being welded.
  • The quality of the weld.
  • The design of the weldment.

In general, the endurance limit of a weldment is directly related to its microstructure.

How do you determine the endurance limit?

The endurance limit of a weldment can be determined by performing a series of fatigue tests on samples of the material. The results of these tests can then be used to calculate the endurance limit of the weldment.

Why is endurance limit important?

The endurance limit is an important factor to consider when designing weldments. This is because the endurance limit directly affects the fatigue strength of the weldment.

Good to know:

1) Fatigue strength

It is the ability of a material to resist failure under repeated or fluctuating loads.

2) S-n curve

It is a graphical representation of the endurance limit. The x-axis represents the number of cycles to failure, while the y-axis represents the stress amplitude.

Related Links

Fatigue limit
Steels – Endurance Limits and Fatigue Stress
Corrosionpedia – What is Endurance Limit (Se)? – Definition from Corrosionpedia
Fatigue Limit | Definition of Fatigue Limit
Whats different between endurance limit vs endurance strength?

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