镀锌钢板的CO2激光焊焊接性

以裁焊板工业生产为背景，对汽车用镀锌钢板的CO2激光切割板坯的CO2激光焊焊接性进行了试验研究。对于不等厚和等厚的镀锌板拼接进行CO2激光焊接，在激光功率4000W时其焊接速度可达0．1m／s。对镀锌钢板激光切口拼接的激光焊接与铣口拼接的激光焊接的焊缝形貌和硬度进行了比较，它们产生的焊缝宽度在0．5-1．0mm范围，激光焊缝最大硬度比母材硬度高出1-1．5倍，激光焊接对激光切口拼接与铣口拼接两者都可获得等同的宏观焊接质量。     

镀锌钢板的CO_2激光焊焊接性(II)

以裁焊板工业生产为背景 ,对汽车用镀锌钢板的CO2 激光切割板坯的CO2 激光焊接的焊缝性能进行了试验研究。试验中的激光焊缝屈服强度都大于母材 ,焊缝金相组织以硬度较软的针状铁素体为特征 ,包含激光焊缝的镀锌钢板仍具有优良的深冲性能 ,在焊缝附近锌层烧损小于 0 .5mm宽。镀锌层具有牺牲保护作用使得激光焊缝不易腐蚀。因此 ,裁焊板的激光焊接工艺可靠 ,从焊接角度看 ,激光切割取代裁焊板生产中剪切工艺是可行的     

镀锌钢板的CO2激光焊焊接性(Ⅱ)

以裁焊板工业生产为背景．埘汽车用镀锌钢板的CO2激光切割板坯的CO2激光焊接的焊缝性能进行了试验研究。试验中的激光焊缝埘服强度都大干母材．焊缝金相组织以碗度较软的引状铁索体为特征，包含激光焊缝的锉锌钢板仍具有优良的深冲性能．在焊缝附近锌层烧损小于0．5mm宽。镀锌层具有牺牲保护作用使得激光焊缝不易腐蚀。因此．故焊板的激光焊接工艺可靠．从焊接角度看，激光切割取代裁焊扳生产中剪切工艺是可行的。     

激光焊接的裁焊板及其在汽车中的应用

介绍了激光焊接用于汽车裁焊板的新技术。使用裁焊板可以实现汽车部件尺寸和材质的优花配合。与滚压缝焊相比，激光焊接具有焊接质量高、适应性广、生产费用和维护费用低的优点，特别适合进行裁焊板的焊接加工。激光焊接裁焊板的技术问题主要有：采用激光切割坯板方案的可行性、接头的成形性、焊接质量的控制和大板拼接变形的控制。     

镀锌板的激光剪拼焊工艺及接头性能研究

剪裁激光拼焊坯板在汽车工业生产中得到了广泛而成功的应用，由于需要成本很高的激光焊接设备和昂贵的高精剪设备，过高的投资限制了其在实际生产中得进一步推广使用，尤其是中小批量的生产。针对这一问题。提出用激光切割代替高精剪，在同一台激光器上实现汽车用镀锌板的剪裁和拼焊工艺，并在自行设计的激光切割拼焊数控机床上时SGCD3和WLZn两种镀锌扳用激光切割的方法剪裁后直接进行激光拼焊，并检测了焊接接头的拉伸强度、弯曲、冲压和焊缝成形等性能指标。试验结果表明，镀锌板的激光剪裁拼焊接头性能符合实际使用要求，在同一台激光加工设备上实现镀锌板的激光切割剪裁后再直接进行激光拼焊的工艺方法是可行的。     

激光拼焊板的研究现状

激光拼焊板具有车身质量轻、生产成本低、生产率高等优点,在汽车制造中具有很大的应用价值。介绍了激光拼焊板在降低车身质量、提高材料利用率、提高结构功能、降低生产成本等方面的优越性,描述了激光拼焊板在异厚度钢板、成型、计算机模拟方面的研究现状。分析并展望了激光拼焊板的现有技术难点和研究解决方向,激光拼焊板接已成为汽车制造中拼板焊最有效的手段。     

汽轮机隔板围带激光切割研究

针对汽轮机隔板的典型零件——"围带"的型孔激光切割加工进行试验研究。结果表明,对于6 mm以上的板,使用190 mm(7.5英寸)的透镜有利于减小切缝宽度。使用纯度为99.5%以上的氧气作为辅助气体不仅可以保证切割质量,而且比使用氮气更经济。     

光纤激光切割厚碳钢板小孔的工艺研究

本文以FL513i型数控激光切割机为平台,研究了高功率光纤激光切割机在切割厚碳钢板小圆孔时的切割工艺,通过对工艺参数的调整,研究了光纤激光功率、切割速度、氧气压力、焦点位置对切割质量的影响,总结出优质切割厚碳钢板小孔的工艺参数组合,解决了光纤切割厚碳钢板质量差的问题,从而使光纤激光在切割厚碳钢板中的应用更为广泛。     

钨合金薄板单模光纤激光切割

钨合金是高熔点材料,其激光热切割是难点。利用单模光纤激光作为切割热源,切割板厚0.9 mm的钨合金(合金成分:93W-4.9Ni-2.1Fe),探讨激光切割工艺参数及其切口质量。试验结果表明,在切割激光功率500 W、切割速度0.5 m/min、切割气体(氮气)压力0.8 MPa的条件下,切割缝宽约102μm,切割缝质量较好。在此激光切割工艺参数的基础上,若降低切割速度,切割缝宽度增大;若提高切割速度,无法获得良好的切割质量;若降低切割气体压力,无法获得良好的切割质量;若增加切割气体压力,对减小切割缝宽度及改善切割质量基本没有影响。     

辅助气体流场对LASOX法激光切割能力和质量的影响

激光切割被广泛用于工业制造领域,但如何提升切割能力和切割质量仍然是值得研究的问题,特别是采用中小功率激光器切割较厚钢板。文中采用散焦激光氧助法(Lasox)对20mm厚低碳钢板的切割能力和切割质量进行了试验研究,采用纹影法对不同喷嘴的自由射流流场形态进行了拍摄,利用计算流体力学软件F1uent对试验中使用的超音速喷嘴进行了自由射流数值模拟,分析了不同压力下喷嘴下方的气体流场以及流场特性对切割过程的影响。研究发现,由喷嘴结构和气流参数决定的辅助气体流场是决定Lasox法切割能力和质量的关键因素,提出了适用于Lasox厚板激光切割的喷嘴设计原则和方法。     

激光拼焊错边产生与预测建模方法

错边是评定激光拼焊质最的一个非常重要的指标,薄板构件错边的控制是激光拼焊中一个难题.针对国内首条全自动激光拼焊设备,对错边的产生以及控制方法进行了深入研究,经过大量试验确定了影响错边大小的几个主要因素,板材自身物理变形、压紧力大小与均匀性、压紧横梁变形、支撑底板平面度误差以及焊接变形的影响.通过分析以上因素对错边的影响以及各个因素之间相互关系,建立了错边预测的数学模型.试验验证了模型的正确性,从而为确定错边产生原因,提高焊接质量提供了一个有效的理论指导.     

激光拼焊板成形性研究

对两各激光并焊板进行了成形研究,考察了激光拦焊板在杯突和拉深试验中的成形特点及焊缝对成形的影响。     

Tailored blank welding between low carbon steel sheet and STS 304 stainless steel sheet by CO2 laser beam

A basic reseach of tailored blank welding between a low carbon steel sheet and a STS 304 stainless steel sheet was carried out with CO₂ laser beam. The materials used in this work were a low carbon steel sheet with a thickness of 0.9 mm and a STS 304 stainless steel sheet with the same thickness. Experiments were carried out by applying the Taguchi method to obtain optimized conditions in order to apply this tailored blank laser welding method in the practical manufacturing process. In order to compare the laser welding results with the conventional welding process, GTA welding was carried out for the same materials. Optical microscopy, SEM and XRD analyses were performed to observe the microstructures and to analyze the various phases. A tensile test, hardness test and Erichsen test were performed to evaluate the formability of welded specimens. In addition, immersion test was carried to estimate corrosion resistance. A WDS analysis showed that laser welding resulted in almost the same dilution of both low carbon steel and stainless steel in welded metal, meanwhile, GTA welding resulted in more dilution of stainless steel due to its slower heat conductivity. The formability of the laser welded specimen reached 83% of that in base metal. On the other hand, it was 63% in the case of GTA welding. During the tension test, base metal was fractured in the case of a laser welded specimen, meanwhile the welded zone was fractured in the case of the GTA welded specimen. The corrosion test showed that weight loss per unit area was less in the laser welded specimen than that of the GTA welded specimen.     

激光拼焊板方盒件及其板料优化设计分析

成形性能的提高对拼焊板车身覆盖件以及结构件冲压成形有重要意义。通过对激光拼焊板方盒件及其板料对成形过程的影响研究,并采用基于板料厚度比、坯料形状和尺寸等板料参数正交设计的成形优化方法,提高激光拼焊板方盒件冲压成形性能。研究和冲压试验表明：当厚度比较小时,破裂出现在薄侧圆角处,而厚度比较大时,破裂出现在薄侧焊缝处;方形坯料拼焊板的成形性能明显低于圆形坯料形状的拼焊板;板料正交设计方法对拼焊板方盒件冲压成形优化是有效可行的。     

A study of tailored blank welding between mild steel sheet and zn-coated steel sheet by CO2 laser beam

Research was conducted on tailored blank welding between mild steel sheet and Zn-coated steel sheet using CO₂ laser beam. The materials used in this study were low carbon steel sheets with a thickness of 1.2 mm and Zn-coated steel sheet with the same thickness and 6.3 μm Zn coating. Experiments were conducted by applying the Taguchi method to obtain optimum conditions for the application of this tailored blank laser welding method in practical manufacturing processes. Optical microscopy, XRD, SEM and TEM analysis were performed to observe the microstructures and to determine the structures of welded zone. In addition, mechanical properties were measured by the microhardness test, tensile test and Erichsen test to evaluate the formability of the welded specimen. There was no trapped Zn in the fusion zone, and the phases of this region consisted of polygonal ferrite, quasi-polygonal ferrite, banitic ferrite and martensite. The elongation value of welded specimen was more than 80% of the value in substrate metal, and the LDH value was more than 90% of the value in substrate metal.     

Superplastically Formed Friction Stir Welded Tailored Aluminum and Titanium Blanks for Aerospace Applications

The purpose of this study was to develop a specialized friction stir welding process for superplastic grade aluminum alloy 5083-SP and titanium alloy 6Al-4V, in thickness of 1.5-4 mm, such that the butt welded nugget would have equal superplastic forming (SPF) characteristics as the parent sheet material. The concept of using tailored blanks for the SPF process is proposed which will allow the joining of multiple pieces to fabricate much larger monolithic components than has been possible in the past. Another benefit of using tailored blanks for SPF applications was found to be a more closely matched blank shape relative to the plan size of the SPF forming die. However, shape of the tailored blanks is critical in SPF of a component. An example of this might be the case where a polygon-shaped blank might work in order to reduce the amount of material used, but a rectangular blank is currently used because a tailor made blank with superplastic joints was not found to be technologically feasible. Upon development of a suitable FSW process for each material, the technology was applied to fabricate full scale test components representing a generic jet engine nacelle Lipskin.