CAJ | 학술논문

通过改变焊接工艺参数对NM400钢板进行活性气体保护的熔化极氩弧焊(MAG)焊接试验.观察焊接接头各区域显微组织,测试焊接热影响区尺寸及焊接接头的力学特性.结果表明:随着焊接线能量的增大,焊接接头的热影响区宽度增加;焊接接头显微组织变粗大,并出现魏氏组织和贝氏体组织;焊接线能量的增加,是导致焊接接头显微硬度、拉伸性能降低的主要原因.
통과개변한접공예삼수대NM400강판진행활성기체보호적용화겁아호한(MAG)한접시험.관찰한접접두각구역현미조직,측시한접열영향구척촌급한접접두적역학특성.결과표명:수착한접선능량적증대,한접접두적열영향구관도증가;한접접두현미조직변조대,병출현위씨조직화패씨체조직;한접선능량적증가,시도치한접접두현미경도、랍신성능강저적주요원인.
By adjusting welding technology parameters,metal active?gas(MAG)welding experiments were performed for NM400 steel plate. The microstructure observations for different zones on welding joints were conducted;the size of heat?affected zone (HAZ)as well as the mechanical properties for welding joints were measured. The results show that with the welding heat input increasing,the width of HAZ increases and microstructures including widmanstatten and bainite structures became coarse. The increase in the welding heat input is responsible for the decrease in micro?hardness and tensile properties of welding joints.