题目内容

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

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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.

Moisture, grease, rust are sources of H in weld.

Different positions in HAZ of carbon steels have different grain sizes.