对60mm厚船板EH40进行了线能量达530kJ/cm的电渣焊试验,并对焊接接头的组织和冲击性能进行了表征.组织分析结果表明:焊接接头粗晶热影响区由针状铁素体、多边形铁素体及晶界铁索体构成,该区宽度约为1mm;焊缝区由尺寸约为10μm的针状铁素体及晶界铁素体构成;熔合区除针状铁素体和晶界铁素体外,还有少量侧板条铁素体.力学性能测试结果表明:焊缝区、熔合区、粗晶热影响区-20℃冲击功均≥60J,且焊后热影响区没有明显软化现象,接头性能满足要求.
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