摘要
采用脉冲钨极氩弧钎焊使用CuSi3钎料对镀锌钢板进行了连接。主要研究脉冲频率变化对接头界面组织和力学性能的影响。结果表明,当电弧脉冲频率由100Hz增加到2000Hz时,电弧钎焊熔池的搅拌和冲刷作用效果逐渐增强,促进了界面须状金属间化合物的破碎行为和熔池成分过冷区域的增加,使得钎料区域内部Fe5Si3(Cu)强化相数量不断增多,弥散宽度变宽,由40μm增加到120μm,接头显微硬度最大值也相应增加,由175MPa增加到204MPa。
The galvanized steel sheet was joined by pulsed arc brazing process, and the joint interfacial structures and properties of the joints at different pulse frequencies were studied, which the arc pulse frequencies are 100 to 2000 Hz. It can be seen that the agitation and brushing action of the molten pool is increaed with the increase of pulse frequencies, then the whisker-like intermetallic compound fragmentation behavior is strengthened and the constitutional supercooling zone is broadened from 40 μm to 120 μm. At last, the dispersal quantity and width of fine Fe5Si3(Cu) particles are increased in brazed joint, which strengthens the joint mechanical properties, and the maximum micro-hardness of the interfacial zone is improved from 175 MPa to 204 MPa.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第11期93-96,共4页
Transactions of The China Welding Institution
基金
上海市教委重点学科建设项目(J51402)
关键词
镀锌钢板
电弧钎焊
脉冲频率
界面组织
galvanized steel sheet
arc brazing
pulsed frequencies
interfacial structure
