作　　者： (郑丽娟）; (李田）; (杜文连）; (于海国）; (付宇明）;

机构地区： 燕山大学机械工程学院,河北秦皇岛066004

出　　处： 《塑性工程学报》 2017年第4期67-70,共4页

摘　　要： 采用ZL201铝铜合金铸锭制备了焊接拉伸试件,通过ZL-2型超强脉冲放电装置对焊接接头进行了电磁热强化试验。通过抗拉强度测试,对比分析了脉冲放电对铝铜合金焊接结构焊缝力学性能的影响。对强化前后的断口进行了SEM断口扫描分析和EDS点成分分析以及金相分析。研究结果表明:通过脉冲放电,焊接接头的拉伸强度平均提高了9.5%;焊接接头内的孔洞缺陷内缘由于电流绕流发生熔化结晶现象,脉冲放电后孔洞内新生晶粒Cu含量增加明显,强化相增加,强脉冲电流使孔洞附近的金属晶粒细化,从而提高了焊接接头的强韧性。 With welding tensile specimen prepared by ZL201 aluminum-copper alloy ingot casting,through the ZL-2 type super pulse discharge device,the electromagnetic heat strengthening experiment was carried out on the welded joint. The effect of pulse discharge on the mechanical properties of aluminum-copper alloy welded structure was compared and analyzed by tensile strength test. The fracture surface of specimen was analyzed by SEM fracture scanning analysis,EDS point component analysis and metallographic analysis of specimen. Results show that through the pulse discharge,the tensile strength of the welded joint increases by 9. 5% on average. Due to the melting and crystallization of the current flow around the hole in welded joint,the Cu content of the new grains in the hole increases obviously,and the strengthening phase increases,moreover,the strong pulse current makes the metal grain refined near the hole,then the strength and toughness of the welded joint are improved.

关 键 词： 铝铜合金 焊接接头 电磁热强化 力学性能 断口