题目内容

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

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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.

Peak temperature in HAZ determines the microstructure of the joint of carbon steels.