间隙对激光-电弧复合焊接接头成形影响的研究  

Research on Influence of Gap Width on Laser-Arc Hybrid Welding Formation

作　　者：王旭海[1] 陈轩[1] 张静[1] 卢庆华[1] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620

出　　处：《热加工工艺》2015年第23期31-34,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51305253);大学生重点科研平台创新训练项目(cz1405007)

摘　　要：使用5kW光纤激光焊和MIG焊复合,对3 mm厚316L不锈钢试板进行对接焊,研究不同间隙情况下焊缝的宏观形貌、微观组织和显微硬度。结果表明,焊缝余高和焊缝宽度随接头间隙的增大而减小。对接间隙小于板厚的25%时,焊缝成形好且组织均匀致密。对接间隙的变化对焊缝显微硬度影响不大,但由于陶瓷衬垫中部分杂质参与熔池反应,在对接间隙为板厚的20%的接头中,焊缝顶部和焊缝底部的显微硬度有所差别。焊缝顶部硬度为383.7 HV0.2,焊缝底部硬度为423.5 HV0.2。Laser-arc hybrid welding by 5kW fiber laser and MIG was adopted to weld 3 mm-thick 316L stainless steel plate. The macro-appearance, microstructure and microhardness of the weld seam with different clearances were studied. The results show that the weld reinforcement and weld width decrease with the increase of butt-joint gap. When the gap is less than 25% of butt plate thickness, the weld formation is uniform and the microstructure is fine. The changes in butt-joint gap have little influence on the microhardness of welding seams. However, since some impurities from the ceramic backing involve in the molten pool, there is a difference in the microhardness between the top and the bottom of welding seam, when the butt-joint gap is 20% of plate thickness; the microhardness is 383.7 HV0.2 on the weld top and 23.5 HV0.2 on the weld bottom, respectively.

关 键 词：激光-电弧复合焊 接头间隙 陶瓷衬垫 组织分析 

分 类 号：TG456.7[金属学及工艺—焊接]