Mg处理EH36级船板钢的大线能量焊接性分析

ANALYSIS OF LARGE HEAT INPUT WELDING PERFORMANCE OF EH36 SHIPBUILDING STEEL WITH Mg TREATMENT

大线能量焊接条件下,以Mg处理为代表的氧化物冶金船技术能有效抑制钢板焊接热影响区组织的粗化。为确定Mg处理EH36级工业试验船板钢的大线能量焊接性能,对其进行了不同线能量下的焊接热模拟试验。结果表明,试验钢具有优异的大线能量焊接性能,其适用的最佳焊接线能量范围为200 kJ/cm以内。与此同时,船板钢通过Mg处理能够获得大量稳定的能够有效诱发IAF的夹杂物。这些夹杂物的尺寸主要集中在1~1.5μm范围内,且为典型的Ti、Al、Mg复合夹杂。

For large heat input welding,oxide metallurgy technology represented by Mg treatment could effectively suppress the coarsening of the welding heat-affected zone.In order to determine the large heat input welding performance of Mg treated EH36 industrial test shipbuilding steel,the welding thermal simulation experiments with different heat input had been done.The results showed that,the test steel has excellent large heat input welding performance,and its applicable optimal welding heat input range is within 200 kJ/cm.At the same time,there would be a large number of stable inclusions in shipbuilding steel that can effectively induce IAF with Mg treatment.The size of the IAF induced inclusions is mainly in the range of 1-1.5μm,and they are the typical Ti-Al compound inclusions.