Welding Inspection & Metallurgy API ICP Self Study Notes

Metals with a high coefficient of thermal expansion are much more
susceptible to warping and distortion problems during welding. The increases
in length and shrinkage that accompany the heating and cooling during
welding should be anticipated, and procedures established which would
assure that proper tolerances are used to minimize the effects of thermal
conditions. The joining of metals in which their coefficients of thermal
expansion differ greatly can also contribute to thermal fatigue conditions, and
result in a premature failure of the component. Welding procedures are often
employed, which specify special filler metals that minimize the adverse
effects caused by inherent differences between the metals being joined.
High coefficient of thermal expansion contribute to;
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Distortions,
Thermal fatigues