AlSi5/镀锌钢CMT熔钎焊微观组织研究  

Study on Microstructure of AlSi5/Galvanized Steel CMT Brazed Joints

作　　者：于治水[1] 聂树文 倪真 李瑞峰[3] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]上海外高桥造船有限公司,上海200137 [3]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《热加工工艺》2014年第11期23-26,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51375294);上海市教委科研创新项目(12ZZ186)

摘　　要：利用CMT焊接技术,以ER4043(AlSi5)焊丝作为填充金属在镀锌钢板上进行表面堆焊试验,在保证AlSi5熔化的基础上,基体仅少量熔化,研究焊接参数对焊道表面成形和截面显微组织的影响。结果表明,采用CMT焊接技术所得AlSi5焊道表面成形均匀,有金属光泽,基本无飞溅生成。当焊接速度为100 cm/min、送丝速度为4 m/min及焊接速度为80 cm/min、送丝速度为3.5 m/min时,在AlSi5焊道/基体界面形成一定厚度的Fe-Al金属间化合物层;增加送丝速度,减小焊接行走速度会加速界面金属间化合物层的形成。发现在焊道两侧润湿铺展前沿形成富锌区,部分位置含锌量达到40 wt%左右。ER4043 （AISiS） filler was deposited on galvanized steel surface using CMT welding method. A1Si5 filler was melted with only small amounts of melted substrate. The influence of welding parameters on the welding bead morphology and cross-sectional structure was studied. It can be seen that the appearance is uniform with bright metallic luster and spatters-free. Fe-AI intermetallic compound interface layer forms when the welding speed is 100 cm/min, wire feed rate is 4 m/min and welding speed is 80 cm/min, wire feed rate is 3.5 m/min, respectively. The increase of wire feed rate and decrease of welding speed can accelerate the formation of Fe-Al layer. A zinc rich region is formed at the wetting tip of the bead. High zinc content of 40 wt % is seen in the region.

关 键 词：CMT焊接技术 镀锌钢板 铝基钎料 组织 

分 类 号：TG454[金属学及工艺—焊接]