焊缝金属对装甲钢焊接性影响的研究进展OA

The research progress on the influence of weld metal on the weldability of armor steel was reviewed.The results show that HAZ cracks in similar weld specimens and bond area cracks in dissimilar weld specimens are typical hydrogen-induced cracks;the main mechanism that the crack resistance of austenitic dissimilar weld joint is superior to that of similar weld joint is caused by the hydrogen behavior in the weld.According to the principle of combining strength and impact toughness,it is speculated that the ERNiFeCr-2 welding wire joint may obtain better ballistic performance compared with the ER70S-6 welding wire joint.In the design scheme of armor steel sandwich or combined weld joint,the hard surface layer provides enough hardness,while the austenitic weld provides excellent toughness and fracture resistance,and the microstructure of each characteristic area makes due contribution to the integrity of the joint and the balance of comprehensive properties,successfully solving the key technology of"the crack resistance and ballistic resistance of the joint cannot be achieved simultaneously"in the relationship between weld metal and weldability of armor steel.