焊接速度对激光-电弧复合焊接接头成型的影响研究

Influence of Welding Speed on the Weld Formation by Hybrid Laser-MIG Welding

为实现10 mm厚304不锈钢板的单道焊接成型,采用10 kW碟片激光与MIG电弧复合的方法进行焊接,分析了焊接速度对焊接接头成型的影响。结果表明,焊接过程中存在的主要缺陷为底部驼峰,焊接速度过小或者过大都会产生底部驼峰,当焊接速度为2.4 m/min时,焊缝底部平滑且连续,焊缝成形良好。组织分析表明焊缝组织为奥氏体基体和3%~5%的铁素体,铁素体形态为大量板条状与少量骨架状,熔合区较窄,约15μm^25μm;拉伸结果表明焊接接头的力学性能低于母材,焊接头的抗拉强度、屈服强度、延伸率分别为711 MPa、321 MPa、54%,达到母材的92.7%、95.8%、88.5%。

To realize single-pass welding for 304 stainless steel with 10 mm thickness,the influence of welding speed on the welding formation was analyzed by hybrid laser-arc welding with 10 kW disc laser.The results show the main defect of welding formation is back hump when the welding speed is too low or too high.It can obtain a good weld formation with smooth and continued bead when the welding speed is 2.4 m/min.The results of welding microstructure analysis show that the microstructure of the weld is austenite matrix and 3%-5%ferrite.The ferrite form is a large number of laths and a small number of skeletons.The weld fusion zone is narrow with 15μm-25μm width.The tensile tests results show that the mechanical properties of the weld joints are lower than that of the base metal.The tensile strength,yield strength and elongation can be up to 711 MPa,321 MPa and 54%,which reach 92.7%,95.8%and 88.5%of the base material respectively.