Research on Weld Crack of Dissimilar Steel Welding Between ZG270-500 and Q345B
Taking the transbeam of Single Column Boring Milling Machine assembly and welding as chance,the weld crack which happened welding between ZG270-500 and Q345B was researched,which is in the large tension stress and restraint intensity of thick plank.Combining experiment with practice,the lamellar tearing from mechanical property,stress condition and weldability was analyzed.The complex stress and large restraint intensity of thick plank of welded joint was also analyzed.The weld defects(such as microcrack,sonims and incomplete fusion)in the welded joint can be taken as crack source.Based on the analysis,the measures were put forward to avoid the welding defects.