CAJ | 학술논문

通过自制的 ZL-2型超强脉冲放电装置对含孔洞缺陷的 A356铝合金焊接接头进行了电磁热强化实验，采用金相显微镜对强化前后焊接接头各区域微观组织和孔洞附近组织进行了对比分析，利用微机控制万能实验机对强化前后试件的拉伸性能进行了测试，并用 SEM 扫描电镜对拉伸断口进行了分析，采用型号为 FM-700的显微硬度计对强化前后试件进行了硬度测试。结果表明：合适的脉冲电流有较好的晶粒细化效果，强化后的焊接接头各区域组织得到细化，焊接接头的力学性能得到改善，经脉冲放电后的抗拉强度平均提高了11%，延伸率平均提高了14.2%，且强化后接头的硬度明显较强化前高。
통과자제적 ZL-2형초강맥충방전장치대함공동결함적 A356려합금한접접두진행료전자열강화실험，채용금상현미경대강화전후한접접두각구역미관조직화공동부근조직진행료대비분석，이용미궤공제만능실험궤대강화전후시건적랍신성능진행료측시，병용 SEM 소묘전경대랍신단구진행료분석，채용형호위 FM-700적현미경도계대강화전후시건진행료경도측시。결과표명：합괄적맥충전류유교호적정립세화효과，강화후적한접접두각구역조직득도세화，한접접두적역학성능득도개선，경맥충방전후적항랍강도평균제고료11%，연신솔평균제고료14.2%，차강화후접두적경도명현교강화전고。
By a ZL-2 super pulse discharge generator,the welded joints of A356 aluminum alloy with hole defects were discharged by electromagnetic heating.Microstructure of welded joints and the microstructure near the hole were analyzed before and after discharge by metallographic microscope. Tensile property test of specimens was made by microcomputer control universal testing machines. Scanning electron microscope was used to observe the fracture organization.Hardness test was made by FM-700 microhardness tester before and after reinforcement.The results show that the appropriate pulse current has better crystal grain refinement effect.After reinforcement the microstructure of wel-ded joints becomes refining,mechanics property of the welding joints is improved,tensile strength is increased 1 1% and elongation is increased to 14.2% on average after pulse current experiments,and the hardness of welded joints increases obviously.