首页|S32101双相不锈钢U形坡口激光填充焊接修复工艺

S32101双相不锈钢U形坡口激光填充焊接修复工艺

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文中采用开设坡口的方式去除裂纹、通过坡口填充焊接修复的方式进行维修,在空气环境中开展了 S32101双相不锈钢激光填丝焊接修复工艺试验研究,焊接工艺及相关参数可以作为水下焊接研究的参考依据.为避免过高激光功率输入损坏焊接辅助装置,在5 000～6000 W激光功率的工艺窗口下,对开设的坡口进行了 3次填充修复及4次填充修复,对焊缝截面、显微组织、力学性能以及耐腐蚀性能分别进行了研究.在试验过程中,采用了光学显微镜和扫描电镜等,分析了焊接过程中热输入对微观组织转变的影响.同时通过对比不同激光功率下焊缝的拉伸性能和显微硬度,进一步揭示了工艺参数对焊缝力学性能和耐腐蚀性能的具体影响,从而优化了修复工艺的稳定性和可靠性.结果表明,3次填充修复后的焊缝存在气孔以及冶金熔合不良等问题,4次填充修复后的焊缝截面未见气孔缺陷,拉伸试件断在母材位置.层间焊道的预热和再热促使焊缝中奥氏体析出,焊缝中奥氏体含量略高于铁素体含量,平均硬度略低于母材.焊缝中较高含量的Ni元素和Mo元素使得焊缝的耐腐蚀性能优于母材,4次填充修复得到的焊缝满足空气环境中修复质量标准要求.
Laser filling welding repair process for U-shaped groove of S32101 duplex stainless steel
In this paper,cracks were removed by beveling,and repairs were performed using groove-filling welding techniques.An experimental investigation of laser wire-filling welding repair of S32101 duplex stainless steel in an air environment was conducted.The welding procedure and related parameters may serve as a reference for underwater welding studies.To prevent damage to the welding auxiliary equipment caused by excessive laser power input,comparative experiments were performed with three filling repairs and four filling repairs under a process window of 5 000～6000 W laser power.The cross-sections,microstructure,mechanical properties,and corrosion resistance of the welds were thoroughly analyzed.During the experiments,optical microscopy and scanning electron microscopy were used to examine the effects of heat input during welding on microstructural transformations.Additionally,by comparing the tensile properties and microhardness of welds at different laser power levels,the specific influence of process parameters on the mechanical properties and corrosion resistance of the welds was further elucidated,thereby optimizing the stability and reliability of the repair process.The results showed that the welds repaired with three filling repairs exhibited issues such as porosity and poor metallurgical fusion,whereas the cross-sections of the welds repaired with four filling repairs showed no porosity defects,and the tensile specimens fractured at the base metal.Preheating and reheating of the interpass welding promoted the precipitation of austenite in the welds,and the austenite content was slightly higher than that of ferrite,with the average hardness being slightly lower than that of the base metal.The higher Ni and Mo content in the welds contributed to superior corrosion resistance compared to the base metal.The welds repaired with four filling repairs met the quality standards for repairs conducted in an air environment.

laser weldingS32101 duplex stainless steelmicrostructurecorrosion resistancemicrohardness

朱加雷、郭方涛、李守根、张仁祥、张晓春、梅乐、黄国军

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北京石油化工学院,机械工程学院,北京,102617

上海核工程研究设计院股份有限公司,上海,200233

激光焊接 S32101双相不锈钢 微观组织 耐腐蚀性能 显微硬度

国家自然科学基金联合基金重点支持项目北京市科技计划重点项目北京市属高校分类发展项目北京市教委一般科技项目北京市属高等学校高水平科研创新团队建设支持计划项目河北省重点研发计划项目河北省重点研发计划项目

U22B20127KZ20221001702311000023T000002199202Z2023-007BPHR2022011022341801D23311802D

2024

10.12073/j.hjxb.20231007001

焊接学报
中国机械工程学会　中国机械工程学会焊接学会　机械科学研究院哈尔滨焊接研究所

焊接学报

CSTPCD北大核心
影响因子：0.815
ISSN：0253-360X
年,卷(期)：2024.45(10)