Harden tendency of steel, content and distribution of hydrogen in welded joints, restraint stress resistance of joints are three factors that leads to the cold cracks of the welded joints.

• 摘要钢材的淬硬倾向、焊接接头含氢量及其分布，以及接头所承受的拘束应力状态是产生焊接冷裂纹的三大主要因素。