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首页> 外文期刊>ISIJ international >Microstructures and Mechanical Properties of Plasma Arc Welded Joints of Ultra-high Strength Steel and Aluminum Alloy Using Al–Si and Al–Cu Fillers
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Microstructures and Mechanical Properties of Plasma Arc Welded Joints of Ultra-high Strength Steel and Aluminum Alloy Using Al–Si and Al–Cu Fillers

机译：Al-Si和Al-Cu填充剂对超高强度钢和铝合金等离子弧焊缝的组织和力学性能

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摘要

The weld appearance, microstructures and mechanical properties of plasma arc welded joints of ultra-high strength steel and aluminum alloy were studied. The weld appearance was improved when the single bevel groove was used. The steel-aluminum joint is divided into weld zone, bond zone and interface zone. The welds with Al–Cu and Al–Si fillers consist mainly of α -Al + Al_(2)Cu and α -Al + Si, respectively. The interface zone has a double-layer structure, the Fe_(2)Al_(5) layer at steel side and the Fe_(4)Al_(13) layer at aluminum weld side. The interface IMC layer is the weakest region in the joint and its evolution process has been summarized. The welding current and filler wire composition have great effects on the interface layer and joint properties. With the increase of welding current, the interface layer thickness increased and the crack appeared in the interface layer when the welding current exceeded 100 A. The joint strength with Al–Si and Al–Cu fillers can reach 62 MPa and 118 MPa respectively at the welding current of 90 A. It is favorable to use Al–Cu filler and welding current of 90 A for improving mechanical properties of the steel-aluminum joint.
机译：研究了超高强度钢与铝合金等离子弧焊接头的焊接外观，组织和力学性能。当使用单个斜切槽时，焊接外观得到改善。钢铝接头分为焊接区，结合区和界面区。使用Al–Cu和Al–Si填充物的焊缝分别主要由α-Al + Al_（2）Cu和α-Al + Si组成。界面区域具有双层结构，在钢侧为Fe_（2）Al_（5）层，在铝焊接侧为Fe_（4）Al_（13）层。接口IMC层是关节中最薄弱的区域，并对其演化过程进行了总结。焊接电流和填充焊丝成分对界面层和接头性能有很大影响。随着焊接电流的增加，当焊接电流超过100 A时，界面层厚度增加，界面层出现裂纹。Al-Si和Al-Cu填料的结合强度分别达到62 MPa和118 MPa。焊接电流为90A。使用Al-Cu填料和90 A焊接电流有利于改善钢铝接头的机械性能。

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