题目内容

Lower bainite may be found in postweld microstructure of QTLA steels.

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Coarse grain in HAZ may cause toughness decrease.

Sometimes, underbead cracks could serve as starting points of fatigue cracking.

In welding QTLA steels,the maximum allowable heat input per unit length of weld can be higher in T-joints than in butt joints.

LBW possibly increase the susceptibility to hydrogen induced cracking of QTLA steels.