SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/eng-welding-residual-stress

Why can welding distort a metal assembly even after it cools?

Uneven heating and cooling leave residual stresses locked into the assembly.

Start playing free

  1. The filler metal is denser than the base
  2. Welding permanently lowers the elastic modulus
  3. Local thermal expansion and contraction leave internal stress ✔

Why: The weld zone expands while hot and contracts while cooling, while cooler surrounding metal restrains it. That mismatch can leave stress and shape change after the heat source is gone.

Huh, didn't know that: Fixtures, balanced weld sequences, heat control, and post-weld treatment can reduce distortion.

The dad joke
The weld held a grudge because it had residual stress.
Like this card?
Play the game

References

Answer: Local thermal expansion and contraction leave internal stress. The weld zone expands while hot and contracts while cooling, while cooler surrounding metal restrains it. That mismatch can leave stress and shape change after the heat source is gone.

  1. DOE Fundamentals Handbook: Material Science www.energy.gov/sites/default/files/2026-04/DOE-HDBK-1017-93_VOL1.pdf
    Welding can induce internal stresses that will remain in the material after the welding is completed.
    Checked 2026-10-10.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

EngineeringFor a uniform bar, what commonly happens to its length as temperature rises?EngineeringHow many base units does the International System of Units (SI) have?EngineeringSince the SI redefinition voted in 2018, what defines the kilogram?

That's stuff everyone should know.