高韧性钢Q345LCLA焊接工艺研究

为匹配室温冲击吸收功高达237 J的低碳低合金高韧性钢Q345LCLA，选择国产焊接材料H10Mn2/SJ101和进口焊接材料Primerweld Ni1K/JF-B分别进行焊接工艺评定。对2种焊接接头进行室温拉伸和侧弯试验，并对焊缝及热影响区在室温，0 ℃，-20 ℃和-40 ℃温度条件下进行冲击试验，同时进行硬度检测及金相组织分析。结果表明，2种焊接材料均具有良好的焊接性，强度、塑性均达到AWSD1.1—2010标准要求，且具有较好的低温及常温冲击韧性，相对而言，Primerweld Ni1K/JF-B的冲击吸收功稍高；2种焊接材料金相组织比较接近，未出现晶粒粗大的魏氏组织及脆硬的马氏体组织，具有良好的金相组织。

Research on Welding Process of Q345LCLA High Toughness Steel

In order to match Q345LCLA low carbon low alloy high toughness steel， which impact toughness value up to 237J at room temperature， it selected domestic welding materials H10Mn2/SJ101 and imported welding material Primer weld Ni1K/JF-B respectively to conduct welding procedure qualification. The tensile test at room temperature and side-bend test were carried out for 2 kinds of welded joints， impact tests were performed for weld and HAZ at room temperature， 0 ℃，-20 ℃ and -40 ℃，at the same time the hardness test and microstructure analysis. The results indicated that 2 kinds of welding material both are with good weldability， the strength and plasticity achieve standard requirements of AWSD1.1—2010， and is with better impact toughness at low temperature and room temperature， relatively speaking， Primer weld Ni1K/JF-B is with higher impact absorbing energy； the microstructure of 2 kinds of welding material is close to， does not appear thick widmanstatten structure or rigid martensitic structure， and is with good metallographic structure.