交变磁场对激光-电弧复合焊316L接头组织及腐蚀性能的影响  

Effect of Alternating Magnetic Field on Microstructure and Corrosion Behavior of Laser-Arc Hybrid Welded 316L Joints

作　　者：温志刚[1] 田雷[1] 沈楠楠[1] 宋付成 檀财旺 WENZhigang;TIANLei;SHENNannan;SONGFucheng;TANCaiwang(Offshore Oil Engineering(Qingdao)Co.,Ltd.,Qingdao 266500,China;Shandong Provincial Laboratory of Special Welding Technology,Harbin Institute of Technology at Weihai,Weihai 264209,China)

机构地区：[1]海洋石油工程(青岛)有限公司,山东青岛266500 [2]哈尔滨工业大学(威海)山东省特种焊接技术重点实验室,山东威海264209

出　　处：《热加工工艺》2025年第7期157-162,共6页Hot Working Technology

基　　金：国家自然科学基金项目(52475332)。

摘　　要：以6 mm厚度316L不锈钢板为对象,开展了磁场辅助激光-电弧复合焊接研究。通过改变磁场强度,对比分析了焊后成形、截面形貌、焊缝组织和焊缝的腐蚀性能。结果表明,交变磁场的引入增大了激光-电弧复合焊的熔透能力,熔透状态由局部未熔透转变为熔透良好。此外,焊缝组织明显均匀化,一方面焊缝电弧区和激光区内奥氏体的Cr元素差异降低,另一方面电弧区和激光区的晶粒尺寸差显著降低。交变磁场提高了接头焊缝的抗腐蚀性能,提高了自腐蚀电位,降低了自腐蚀电流密度,焊缝腐蚀速率减慢,点蚀坑密度显著减小。研究表明,对于激光-电弧复合焊,磁场的引入有利于提高熔透能力和焊缝均匀化,改善焊缝的成形和腐蚀性能。With a 6 mm thick 316L stainless steel plate as the object,the magnetic field assisted laser-arc composite welding study was carried out.By changing the magnetic field intensity,the weld appearance,cross-sectional morphology,weld microstructure and weld corrosion behavior were analyzed.The results show that the alternating magnetic field increase the penetration ability of laser-arc hybrid welding,and the penetration state changes from local incomplete penetration to good penetration.In addition,the microstructure of the weld seam is significantly homogenized.On the one hand,the difference in Cr element between the austenite in the arc zone and the laser zone is obviously reduced,on the other hand,the grain size difference between the arc zone and laser zone is obviously reduced.The alternating magnetic field improves the corrosion resistance of the joint weld.It increases the self-corrosion potential and reduces the current density,thus significantly reduces the density of pitting pits in the weld.The study indicates that for laser-arc hybrid welding,the introduction of magnetic field is beneficial for improving the penetration ability and weld uniformity,which improves the formability and corrosion performance of the weld.

关 键 词：316L不锈钢 激光-电弧复合焊接 磁场辅助 腐蚀性能 

分 类 号：TG456.7[金属学及工艺—焊接]