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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。
ZL201 aluminum-copper alloy ingot was used to prepare the welding tensile specimen. Electromagnetic heat-enhanced test was carried out on the welded joint by ZL-2 super impulse discharge device. Through the tensile strength test, the influence of pulse discharge on the mechanical properties of welded joints of aluminum-copper alloy was analyzed. SEM fracture scanning and EDS point component analysis and metallographic analysis were performed on the fracture surface before and after strengthening. The results show that the tensile strength of the welded joint increases by 9.5% on average by pulse discharge. The inner edge of the hole defect in the welded joint melts and crystallizes due to the current flowing around it, and the content of Cu in the new hole increases obviously after pulse discharge. Enhanced phase increases, the strong pulse current to the hole near the metal grain refinement, thereby enhancing the toughness of the welded joints.