焊管2024，Vol.47Issue(5)：33-39,7.DOI:10.19291/j.cnki.1001-3938.2024.05.005
激光功率对3/4H SUS301和SUS316异种不锈钢激光点焊成形特征及组织性能的影响
Effect of Laser Power on Laser Spot Welding Forming Characteristics and Microstructure Properties of 3/4H SUS301 and SUS316 Dissimilar Stainless Steel Laser Spot Welding Joints
摘要
Abstract
Dissimilar metal laser welding was carried out between 3/4H SUS301 and SUS316 stainless steel which were acted as elastomer and support body of force measuring sensors by using quasi-continuous wave laser.The effect of laser power on the influence of forming characteristics and mechanical properties of the spot welded joint was investigated.It was shown that angle distortion was increased with an increase of laser power when a quasi-continuous laser was adopted of which the laser power was varied from 180～270 W with a regular pulse time of 2 ms.And the angle distortion was much lower than the allowable deformation of the force measuring sensor when the laser power of 270 W was applied.Porosity defects were detected on the interface of the spot weld under a lower laser power of 210 W and it was formed again in the bottom zone of the keyhole of the spot welded joint when a higher laser power of 270 W or above was used.For the grain shape of the sopt welded joint,celluar crystals grew from the both sides of fusion area to the weld center resulting in growing into columnar crystal.And equiaxed dendrites was formed in the center zone of the spot welded joint.The width of exquixed crystal region was decreased with an increase of laser power.Incomplete recrystallization occurred in the deformed structure due to its exposure to a higher temperature in the spot weld resulting in inducing a inhibition of the deformation induced martensitic transformation.Hereby,the composition of α'martensitic was decreased.Shear strength of the spot weld joint was increased and then was decreased with an incrase of laser power.The maximum shear strength of the spot weld joint reached to 0.49 kN which was much higher than the industry standard when a laser power of 250 W was applied.关键词
激光焊接/点焊/晶粒形态/气孔缺陷/显微组织Key words
laser welding/spot welding/grain shape/porosity defect/microstructure分类
矿业与冶金引用本文复制引用
董智龙,彭丽雯,侯军才,张秋美,张会..激光功率对3/4H SUS301和SUS316异种不锈钢激光点焊成形特征及组织性能的影响[J].焊管,2024,47(5):33-39,7.基金项目
陕西省科技厅攻关项目"传感器用FeCrCoW高电阻合金的开发应用"(项目编号2024GX-YBXM-376) （项目编号2024GX-YBXM-376）
陕西理工大学大创项目(项目编号202310720141). （项目编号202310720141）
