题目内容

Comparing with low carbon steels, high carbon steels are with better weldability.

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It is advisable to take advantage of auto-tempering to avoid hydrogen induced cracking in HTLA steels welding.

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

Coarse grain in HAZ may cause toughness decrease.

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