高强钢冷裂纹启裂位置判据与焊缝强度匹配的关系

Relationship between the criterion of crack initiation site for high-strength steel and the weld strength matching

综述了高强钢冷裂纹启裂位置判据与焊缝强度匹配的关系。结果表明,冷裂纹启裂位置判据,是通过焊缝硬度判断高强钢根部焊道冷裂纹启裂位置的冷裂纹敏感性间接判断方法。高强钢冷裂纹启裂位置判据影响因素中,施加应力是冷裂纹启裂或交替萌生的必要条件,而氢浓度和焊缝硬度的变化则是冷裂纹启裂或交替萌生的充分条件。焊缝强度匹配类型与“冷裂纹启裂位置判据”具有良好的对应关系,该关系能很好解释“冷裂纹启裂位置判据”试验中的规律及现象。提出了基于冷裂纹启裂位置判据的焊缝强度匹配实施工艺。

The relationships between the criterion of crack initiation site for high-strength steel and the weld strength matching were reviewed.The results show that the criterion of cold crack initiation site is an indirect method to judge the cold crack sensitivity in root pass welding for high strength steels by weld hardness.Among the influencing factors of criterion of the cold crack initiation site for high-strength steels,the applied stress is a necessary condition for cold crack initiation or alternate initiation,while the changes of hydrogen concentration and weld hardness are sufficient condition for cold crack initiation or alternate initiation.The type of weld strength matching has a good correspondence with the"criterion of cold crack initiation site",which can well explain the rules and phenomena in the"criterion of cold crack initiation site"test.The implementation process of weld strength matching based on the criterion of cold crack initiation site is put forward.