摘要
采用CO_2激光与MAG电弧进行旁轴复合焊接,研究了不同热源间距对焊缝形貌、熔宽及熔深的影响,分析了焊接顺序对不同热源间距时的焊缝形貌、深宽及微观组织的作用机理。研究表明:对于中碳高强钢,采用激光后置的复合焊接形式较好,电弧对焊接金属起到预热和微熔作用,提高了材料对激光的吸收率,增加熔深,热源间距为2 mm时,熔深最大;而热源间距为4 mm和6 mm时,焊缝表面形貌较好,但激光前置时两热源的耦合效果较差;激光后置时的焊接接头显微组织均匀,微观缺陷少。
The effect of the distance between laser and arc on weld appearance,width and penetration depth in paraxial CO_2 laser-MAG hybrid welding was studied,and its mechanism was analyzed.The studied results showed that the weld metals was preheated and micro-melted,which improve the absorption rate of the laser and weld penetration were increased as medium carbon high strength steels was welded.The penetration depth is obtained its maximum when the distance between laser and arc was 2 mm,but the weld shape was better when the distances between laser and arc were 4 mm and 6 mm,respectively.The effect on coupling of the two heat sources was worse for laser leading.The microstructure of welded joints was uniformed with less deficiency in the microstructure for the arc leading.
出处
《焊接》
北大核心
2012年第3期18-22,69-70,共5页
Welding & Joining
基金
新世纪优秀人才计划(No.XS.12008-1)
国家科技部基础研究项目(No.2009DFB70360)
关键词
复合焊接
高强钢
热源间距
焊缝成形
显微组织
hybrid welding
high strength steels
distance between laser and arc
weld shape
microstructure
