光纤激光焊接ANSI304不锈锅中厚板工艺参数研究

随着海工装备和核电工业的发展,对不锈钢厚板的焊接要求越来越高。采用正交试验方法对6mm厚的ANSI304不锈钢进行光纤激光拼焊,研究了工艺参数（包括激光功率、焊接速度和离焦量）变化对304不锈钢（0Crl9Ni9）焊接结果的影响,结合激光深熔焊原理对试验结果进行了理论分析,并对焊接试件进行了拉伸试验,检测了焊接试件的拉伸性能,获得了6mm厚’ANSI304不锈钢激光焊接的最佳工艺参数。     

光纤激光焊接ANSI304不锈钢中厚板工艺参数研究

随着海工装备和核电工业的发展,对不锈钢厚板的焊接要求越来越高.采用正交试验方法对6mm厚的ANSI 304不锈钢进行光纤激光拼焊,研究了工艺参数(包括激光功率、焊接速度和离焦量)变化对304不锈钢(0Cr19Ni9)焊接结果的影响,结合激光深熔焊原理对试验结果进行了理论分析,并对焊接试件进行了拉伸试验,检测了焊接试件的拉伸性能,获得了6mm厚ANSI 304不锈钢激光焊接的最佳工艺参数.     

金属超薄板光纤激光焊接

采用连续激光焊接,焊接速度可以达到50～60mm/s,相对于脉冲激光焊接,生产效率上极具优势。采用波长为1070nm的光纤激光对厚度为0.1mm的304不锈钢超薄板进行连续激光搭接焊,研究了焊接功率、焊接速度和离焦量等焊接工艺参数对焊缝质量的影响规律。实验表明,焊接功率的增加会逐步增加焊缝的熔深和熔宽,当焊接功率达到160W时,焊缝在下层板的熔深陡然增大,出现了不锈钢超薄板的激光深熔焊;此外,相对于负离焦,正离焦更容易得到更深的熔深,但焊缝宽度会略有增加,采用+1mm的离焦量产生大熔深和窄焊宽,因此不锈钢超薄板激光焊接适宜采用正离焦。     

工艺参数对不锈钢薄板激光切割质量的影响

采用YAG脉冲激光切割机对1 mm厚的304不锈钢薄板进行了切割试验,通过正交试验方法,研究了激光切割工艺参数对切口表面的宏观形貌、切缝宽度和端面粗糙度的影响规律,并对激光切割工艺参数进行了优化。结果表明:随着电流增大,切口下表面挂渣量增大;随着电流、脉宽和频率的增大,切缝宽度均增大;随着脉宽的增大,端面粗糙度迅速增大,随着电流、频率和切割速度的增大,端面粗糙度先减小后增大。根据正交试验结果分析,激光切割1 mm厚的304不锈钢板的最佳工艺参数为电流120 A,脉宽0.5 ms,脉冲频率100Hz,切割速度300 mm/min。     

不锈钢激光焊接工艺的研究

本文通过用300WCO_2激光器对两种不锈钢薄板材料进行激光对焊和端焊实验以及对焊接后金相组织的分析,探讨了获得材料最佳力学性能所需的激光焊接工艺参数和相应的金相组织。分析了材质、原始状态、保护气体等条件对焊接效果的影响,提出了激光特种焊接工艺的规律性。     

焊接参数对304不锈钢激光焊接温度场分布特征的影响

采用红外热像测量的方法,跟踪拍摄304不锈钢激光焊接的过程,研究激光焊接参数对304不锈钢焊接温度场特征的影响。试验结果表明,激光功率一定时,随焊接速度的减小,熔化区域的长度和宽度增大,但温度场分布的基本特征未变;焊接速度一定时,随激光功率的增大,焊缝正面温度场的整体温度升高,特别是熔池后端次高温区的温度显著升高和面积显著增大,但温度场分布的基本特征未变;输入线能量相近时,高功率/高速度组合的“小孔”区域温度较高,低功率/低速度组合的次高温区域的温度较高、面积较大,但是后端焊缝区域的温度较低。     

不锈钢超薄板脉冲微束等离子弧焊熔池尺寸和焊缝成形质量

利用基于背光光源的熔池视觉传感检测系统采集超薄板脉冲微束等离子弧焊焊接过程中熔池轮廓的变化,在平均电流为1.8 A条件下研究基值电流与峰值电流之比(0.29～0.71)、占空比(30％～70％)、脉冲频率(25～100 Hz)对304不锈钢超薄板焊接熔池尺寸和焊缝成形质量的影响.结果表明:在试验条件下采集到的熔池宽度均...     

金属粉末对钛合金焊接头组织性能的影响

为探究激光焊接过程中添加不同金属粉末对焊接接头组织性能的影响规律,在进行TC4钛合金薄板的激光焊接试验时,分别添加Ni60A粉末和铁基粉末作为焊料进行焊接。实验仪器选择采用IPG光纤激光器、PERCITEC YC52激光头和侧向送粉系统。试验结果显示,添加Ni60A粉末得到的焊接头表面洛氏硬度和显微硬度比添加铁基粉末得到的焊接头高,结合效果更好。主要由于Ni60A粉末中含有的Cr和Si等元素的含量比铁基粉末中含量高,这些元素和基体中的金属元素发生化学反应生成了硬度比较高的化合物。激光焊接过程中添加金属粉末可以明显改善焊接头处的组织性能,对其的研究具有非常重要的意义。     

304不锈钢光纤激光对接焊缝焊接试验研究

采用光纤激光对6 mm的304不锈钢进行对接焊接试验,分别研究了激光功率、焊接速度、离焦量等参数对接头性能的影响。结果表明:激光功率为4 k W,焊接速度0.038 m/s,离焦量为0 mm时,得到较为优异的焊接接头。焊缝区的硬度较高,接头试样抗拉强度是母材的83.0%,可以在断口处发现存在一定的剪切唇,且断口呈撕裂状,韧窝形貌明显,属于韧性断裂。     

奥氏体不锈钢薄板立向下焊接工艺改进

本文从焊接材料、焊接参数及焊接操作方法等方面的选择出发对奥氏体不锈钢薄板立向下焊的工艺进行了改进,阐明了奥氏体不锈钢薄板立向下焊的控制要素。     

Some studies on temperature profiles in AISI 304 stainless steel sheet during laser beam welding using FE simulation

The investigation of transient temperature profiles of a weld joint produced by the laser welding process is presented. A three-dimensional finite element model is developed using a commercial finite element code ANSYS in order to obtain the behavior of temperature field and molten pool shape during the welding process. A three-dimensional conical Gaussian heat source is employed as a heat source model for performing a non-linear transient thermal analysis. The temperature-dependent material properties of AISI 304 stainless steel sheet are taken into account, which has a great influence on the temperature fields indicated by the simulation results. The effect of latent heat and the convective and radiative boundary conditions are also included in the model. A series of laser welds are performed using a 2-kW continuous wave Nd:YAG laser welding system. The experimental trials are conducted by varying the laser input parameters namely beam power, welding speed, and beam incident angle to validate the model. The results show that there is a good agreement between the finite element simulation and the experimental observations.     

不锈钢薄板光纤激光焊接的组织与性能

采用GSI的JK-200FL型连续光纤激光器实现了 0.2mm厚304不锈钢片的对接焊.在氩气保护下,优化后工艺参数为激光功率90W,光斑直径0.2mm.焊接速度1200mm/min,获得成形良好,无缺陷的焊缝.采用金相显微镜可见焊缝组织由边缘细小的柱状晶和中心部位细小的等轴晶组成.经硬度测试和弯折测试,表明焊缝处的硬...     

Analysis of pulsed Nd:YAG laser welding of AISI 304 steel

Pulsed laser welding of AISI 304 stainless steel plate was simulated using commercial finite element software to determine the optimal welding conditions. Due to geometric symmetry, only one plate was modeled to reduce the simulation computation time. User subroutines were created to account for a moving three-dimensional heat source and to apply boundary conditions. The material properties such as conductivity, specific heat, and mass density were determined as functions of temperature. The latent heat was considered within the given temperature range. The three-dimensional heat source model for pulsed laser beam butt welding was designed by comparing the finite element analysis results and experimental data. This successful simulation of pulsed Nd:YAG laser welding for AISI 304 stainless steel will prove useful for determining optimal welding conditions.     

钢-铝异种合金脉冲激光焊焊缝表征分析

采用Nd:YAG激光焊对304不锈钢和5052铝合金进行异种金属焊接,分别以峰值功率、焊接速度、离焦量和脉冲频率等工艺参数设计24组工艺试验,并对比分析未熔合、熔合和焊穿3种焊缝表面表征。运用激光点位移传感器测量焊缝高度,探索焊缝高度随激光功率等工艺参数的变化趋势,得出钢-铝焊缝3种表面形貌的工艺参数区间。分析结果表明,焊缝的表面形貌是由激光单点能量、离焦量和脉冲频率等因素共同决定,焊缝高度与峰值功率、焊接速度、离焦量和脉冲频率等工艺参数有一定的变化规律。     

Laser-arc hybrid welding of wrought to selective laser molten stainless steel

Selective laser melting (SLM) is a successful tool-free powder additive technology. The success of this manufacturing process results from the possibility to create complex shape parts, with intrinsic engineered features and good mechanical properties. Joining SLM steel to similar or dissimilar steel can overcome some limitations of the product design like small dimension, undercut profile, and residual stress concentration. In this way, the range of applications of the SLM process can be broadened. In this paper, the hybrid laser welding of selective laser molten stainless steel was investigated. A high-power fiber laser was coupled to an electric arc and austenitic stainless steel wrought and SLM parts were welded together. The power and speed parameters were investigated. The joints were analyzed in terms of weld bead profile, microstructure, microhardness, and tensile test. The efficiency of the welding process was evaluated through the line energy input versus the weld molten area.     

Theoretical and experimental analysis of the remote welding process on thin, lap-joined AISI 304 sheets

In this study, a theoretical approach of the remote welding process has been developed and discussed. The study obtains numerically the melting boundaries of different heat source angles, based on an analytical calculation of the keyhole depth. The approach considers the dominant process parameters of the laser power, the welding speed and the inclination of the laser beam on the workpiece surface. The geometrical particularities of the beam spot, due to the different inclination of the laser beam upon the processing plane, have also been considered in a previous study of the authors. The theoretical results present good agreement when compared with experimental data obtained from a remote welding system (RWS) on lap welding of AISI 304 stainless steel, thin sheets.     

0Cr18Ni9手工钨极氩弧焊和电弧焊工艺对比

文中讨论了奥氏体不锈钢焊接技术,通过0Cr18Ni9（δ=3mm）手工钨极氩弧焊和电弧焊焊接之间的工艺及性能对比（均采取单面焊两面成形）,介绍了薄板手工钨极氩弧焊焊接工艺的优点,为不锈铜材料焊接提供了一种很好的焊接技术。     

深熔激光焊接熔池温度场的数值模拟

利用旋转Gauss曲面体新型热源模型,忽略深熔激光焊时小孔对传热的影响,建立了移动激光热源作用下的三维数学模型.利用PHOENICS3.4软件,模拟了SUS304不锈钢深熔激光焊接热过程的温度场和熔池熔合线形状,得到了不同焊接速度下的温度场分布云图和"钉头"状的熔池形状.数值模拟结果与试验结果基本吻合.     

Ni60 A含量对激光再制造试件力学性能的影响

采用激光再制造技术在Q235基材上熔覆三种不同成分配比的304不锈钢粉末,分别为纯304不锈钢末,添加10％Ni60A的304不锈钢粉末,添加15％Ni60A的304不锈钢粉末,利用维氏显微硬度计研究熔覆层表面维氏显微硬度,利用万能试验机研究熔覆层拉伸力学性能。实验结果表明：添加了Ni60 A粉末的304不锈钢再制造试件由于发生了固溶强化,使得维氏显微硬度和抗拉强度显著增强,延伸率则有所下降,且随着Ni60 A含量的增加,效果更明显。