Effect of Mechanical Arc Oscillation on the Grain Structure of Mild Steel Weld Metal
Effect of Mechanical Arc Oscillation on the Grain Structure of Mild Steel Weld Metal
复制标题
DOI：
10.1007/s12666-012-0118-9
复制
发表时间：
2012-04-01
影响因子：
1.6
通讯作者：
Mishra, S.
中科院分区：
文献类型：
--
作者：
Mahajan, S.;Biradar, N. S.;Mishra, S.
研究了机械电弧振荡对低碳钢钨极氩弧焊焊缝金属晶粒组织的影响。对于没有电弧振荡的焊缝，在焊缝金属中观察到柱状晶;然而，对于相同的焊接参数，电弧振荡的焊缝在焊缝金属中具有较小尺寸的相对等轴晶粒。电弧振荡焊缝的强度高于无电弧振荡的焊缝，韧性明显增加，这可能是由于电弧振荡导致的晶粒尺寸直径减小。较低的焊缝金属硬度和增加的热影响区的硬度，观察电弧振荡的焊缝，这可能是由于增加的先共析铁素体的形成与魏氏铁素体组织的情况下，在焊缝金属和晶粒粗化较少的热影响区，由于增加冷却速率。
The effect of mechanical arc oscillation on the weld metal grain structure in mild steel gas tungsten arc welds has been studied. For welds made without arc oscillation, columnar grains were observed in the weld metal; however, for the same welding parameters, the weld made with arc oscillation had smaller sized relatively equiaxed grains in the weld metal. The strengths for weld made with arc oscillation was higher than that for weld made without arc oscillation, with appreciable increase in ductility; this could be attributed to the reduction in grain size diameter due to arc oscillation. Lower weld metal hardness and increase in heat affected zone hardness was observed in weld made with arc oscillation; this could be attributed to increase in pro-eutectoid ferrite formation with absence of Widmanstatten ferrite structures in the weld metal and less coarsening of grains in the heat affected zone due to increased cooling rate.