铝合金焊接研究现状

现代有色金属焊接工艺的进步,将有利于我国工业的进步。本文从铝合金的分类及其焊接性出发,介绍了钨极氩弧焊、搅拌摩擦焊、熔化极惰性气体保护焊、激光焊、激光-电弧复合焊在铝合金焊接中的研究现状,并对铝合金焊接未来的发展方向进行了展望。     

铝合金焊接研究现状及发展趋势

现代有色金属焊接工艺的进步,将有利于我国工业的进步。本文从铝合金的分类及其焊接性出发,介绍了钨极氩弧焊、搅拌摩擦焊、熔化极惰性气体保护焊、激光焊、激光-电弧复合焊在铝合金焊接中的研究现状,并对铝合金焊接未来的发展方向进行了展望。     

焊接技术在航空航天工业中的应用

焊接技术是航空航天工业的重要连接技术,在航空航天材料加工过程中,处于重要地位,焊接技术已成为飞机制造中的关键技术,为飞机的设计和制造提供了技术保证。本文对电子束焊、激光焊、搅拌摩擦焊、线性摩擦焊、扩散焊的原理、特点及应用进行了介绍。     

镁合金焊接技术的研究进展及应用

镁合金有很多优异的性能,在航空航天、汽车、电子等领域具有广阔的应用前景,而镁合金的焊接技术是制约其发展的关键技术之一.简述了镁合金的性能及应用,着重讨论了镁合金钨极氩弧焊、激光焊、电子束焊、激光-TIG复合焊、搅拌摩擦焊、电阻点焊的焊接特点,综述了镁合金焊接技术的研究进展和应用.     

镁合金焊接研究现状

近年来,随着镁合金在交通运输、航空航天、3C等领域的广泛应用,焊接技术成为制约其应用的瓶颈。本文针对镁合金的特点及焊接性进行了分析,对钨极氩弧焊、熔化极惰性气体保护焊、激光焊、电子束焊、搅拌摩擦焊在镁合金焊接中的研究现状进行了介绍,并对镁合金焊接未来的发展方向进行了展望。     

铝合金线性摩擦焊研究现状

线性摩擦焊作为一种新型的固相焊接技术,热输入低、焊接应力小,适合于铝合金的焊接。介绍了线性摩擦焊的工作原理,主要综述了铝合金线性摩擦焊数值模拟、微观组织和力学性能等3个方面的研究进展。在此基础上,着重介绍了摩擦压力、焊接时间及振动频率等工艺参数对铝合金线性摩擦焊微观组织和力学性能的影响,介绍了工艺参数对铝合金与不锈钢、纯铜、镁合金等异种金属线性摩擦焊微观组织、力学性能及金属间化合物种类和分布的影响。最后,对铝合金线性摩擦焊在数值模拟、接头性能及金属间化合物调控方面存在的不足进行了总结,并对其主要发展方向进行了展望。     

大块金属玻璃焊接研究进展

综述了大块金属玻璃焊接领域的最新进展;介绍了成功焊接大块金属玻璃的不同方法,包括爆炸焊、电火花焊、电子束焊、用多层金属片进行焊接等熔化焊,以及固相下的摩擦焊.熔化焊接方法的成功,原因在于大块金属玻璃的玻璃态成型能力和在这些方法中高的线能量;而摩擦焊接的成功,则是由于金属玻璃在过冷液相区的热稳定性以及在该区域的超塑性和粘滞性.     

铝合金搅拌摩擦焊研究现状及应用

搅拌摩擦焊是由英国焊接研究所发明的一种固相连接技术，可以对熔化焊接性差的铝合金进行可靠的连接，又具有诸多优点。介绍了搅拌摩擦焊工艺过程，分析了搅拌摩擦焊技术目前存在的优缺点，综述了铝合金搅拌摩擦焊的国内外研究现状和应用情况，指出搅拌摩擦焊为现代铝合金制造业提供了新的连接方法。     

超薄铝合金胶粘接及激光焊接工艺研究

目的 为了解决厚度为0.05 mm的铝合金在激光焊接过程中,材料发生变形导致的焊穿或者虚焊问题.方法 采用在下层铝合金材料表面均匀涂覆粘胶剂,将上下2层铝合金材料进行预固定,然后采用激光焊接,形成焊缝.通过控制涂覆粘胶剂的次数,得到胶层厚度为11.2μm,对涂覆粘胶剂的铝合金进行激光焊接实验.结果 当激光平均功率为150 W,焊接速度为100 mm/s,离焦量为2 mm时,焊缝剪切强度最大,为124 MPa,达到母材剪切强度的82％.结论 通过粘胶剂预固定后,在激光加热过程中,可以很好地克服材料的变形,让上下材料形成熔池,熔池冷却凝固后熔合在一起形成焊缝,可以解决材料发生变形导致的焊穿或者虚焊问题.     

焊接方法对铝合金焊接接头微弧氧化色差的影响

目的 分析铝合金焊接接头微弧氧化过程中色差产生的原因。方法 采用单激光和激光-MIG复合焊2种焊接方法焊接2A12铝合金,利用RGB值定性描述不同焊接试样的色差差异大小,采用金相、SEM和微区XRD观察2A12铝合金单激光和激光-MIG复合焊接头微弧氧化前后的组织、微观形貌和表面物相组成。结果 经微弧氧化处理后,2A12铝合单激光焊焊件的焊缝和母材之间无明显色差,2A12铝合金激光-MIG复合焊焊件的焊缝和母材之间存在明显色差,结合金相组织、表面和截面的SEM形貌以及表面EDS和XRD测试分析结果可知,成分和表面熔融物颗粒的大小不同是铝合金焊接接头微弧氧化色差形成的主要原因,焊接接头的组织对铝合金焊接接头微弧氧化色差的产生没有影响。结论 单激光焊接接头微弧氧化后的氧化色差较激光-MIG复合焊接头的小;铝合金(2A12)焊接接头产生氧化色差主要是因为焊接接头的成分和表面熔融物颗粒大小不同,而组织对色差无影响。     

铝基合金水解制氢的研究进展

铝是地壳中含量最丰富的金属元素,也是一种重要的轻金属。由于其活泼的化学性质和较高的能量密度,铝作为一种新型能源材料正日益受到人们的关注。综述了国内外铝基合金水解制氢的研究进展,在对比分析各种铝基合金水解制氢性能以及成本等基础上,提出了铝基合金水解制氢的发展方向。     

铝锂合金搅拌摩擦焊研究进展

铝锂合金作为一种低密度、高性能的新型结构材料,被认为是航空航天领域中实现飞行器轻量化的理想结构材料之一。而搅拌摩擦焊作为一种固相焊接技术,能够克服铝锂合金熔化焊时易产生的裂纹、气孔等缺陷,在铝锂合金焊接领域具有重要的应用前景。从搅拌摩擦焊焊接工艺、接头组织与性能等方面综述了铝锂合金搅拌摩擦焊近几年的研究进展,总结了其存在的主要问题,并对铝锂合金搅拌摩擦焊技术未来的发展进行了展望。     

The wear rates and performance of three mold insert materials

In this study, a rapidly solidified aluminum alloy was compared with beryllium copper and 6061 aluminum alloys in terms of their wear rates, hardness and performance as mold insert materials. A Vickers hardness measuring machine and a tribometer were used to determine the hardness values and wear rates of the materials. Three sets of mold inserts were made of these materials, and the insert surfaces and the molded plastic lens surfaces were characterized using a scanning electron microscope and a surface profilometer, respectively. The investigation results indicate that the BeCu alloy has the lowest wear rate, while aluminum 6061-T6 has the highest wear rate. Although the rapidly solidified aluminum alloy is not as hard as the BeCu alloy, the differences between their wear rates and hardness values are not as great as the differences between aluminum 6061-T6 and the BeCu alloy. The results also indicate that the rapidly solidified aluminum alloy performs much better than aluminum 6061-T6 in molding of plastic lenses and is comparable to the BeCu alloy. It is able to attain finer surfaces of the molded plastic lenses. This is an important finding, and this means that the rapidly solidified aluminum alloy can replace the BeCu alloy as a good mold insert material, because beryllium (Be) is a toxic element. The finding gives the industry a better choice for selection of mold insert materials.     

Energy-storage Welding Connection Characteristics of Rapid Solidification AZ91D Mg Alloy Ribbons

Energy-storage welding connection characteristics of rapidly solidified AZ91D Mg alloy ribbons with 40-70 μm thickness are investigated using a microtype energy-storage welding machine. The microstructure and performance of the connection joints are analyzed and studied. The research results indicate that energy-storage welding is able to realize the spot welding connection of AZ9ID Mg alloy ribbons. The welding nugget consists of developed α-Mg equiaxed grains with the sizes of 1.2-2.7 μm and intergranular distributed β-Mg17Al12 compounds. The thickness of bond zone is about 4 μm and the solidification microstructure is characterized by the fine equiaxed grains with the sizes of 0.8-1.2μm and grain boundary has become coarsening. The columnar crystal in HAZ also becomes slightly coarsening and the grain boundary has broadened, however, there is no obvious change in its primitive morphology and crystallographic direction. When welding energy is about 2.0 J, the welding joints with higher shear str     

Hot-Dip Coating of Lead-free Aluminum on Steel Substrates with Ultrasonic Vibration

Hot-dip coating has been practically employed in manufacturing zinc alloy coated steel sheets.However,it is difficult to coat aluminum alloy on a bulky steel substrate without sufficient preheating,because a rapidly solidified layer containing gas babbles is formed on a substrate surface.A variety of iron-aluminides are also formed at the interface of a steel and aluminum hot-dip coating system,which is the main difficulty in joining of steel with aluminum.Ultrasonic vibration was applied to a steel substrate during hot-dip coating of aluminum alloy to control a rapidly solidified layer and a brittle reaction layer.Hot dipping of columnar steel substrates into molten aluminum alloy （Al-2.7 mass fraction Si-4.6 mass fraction Sn） was carried out through the use of a Langevin oscillator with resonant frequency of 19.5 kHz.The application of ultrasonic vibration is quite effective to control a rapidly solidified layer and a surface oxide layer from a substrate surface by the sonocapillary effect based on a cavitation phenomenon,so that the intimate contact is achieved at the beginning of hot-dip coating.The application of ultrasonic vibration to hot-dipping is effective to control a reaction layer with less than 5 #m in thickness.An impact test exhibits that the good adhesive strength is approved in hot-dipped aluminum coatings with a thin reaction layer of approximately 5μm.     

快速凝固7000系超高强铝合金的研究现状

在对传统7000系高强铝合金分析的基础上,着重阐述了快速凝固超高强铝合金的发展过程、存在问题和研究现状.快速凝固技术可有效细化组织、提高合金元素的极限固溶度、抑制宏观和微观偏析,并提高超高强铝合金的综合性能,最后提出了快凝超高强铝合金的应用和发展前景.     

6063铝合金单模光纤激光焊接工艺研究

目的 针对采用脉冲激光点焊的6063铝合金焊点拉力较低,无法满足实际需求的问题,研究6063铝合金激光焊接的最优工艺方案,以提升焊点拉力.方法 采用单模光纤激光对6063铝合金进行焊接,通过极细的线宽组成螺旋点,代替单个脉冲激光点焊.对激光功率、焊接速度及离焦量等工艺参数进行正交实验,得到最佳工艺参数,并通过分析焊缝外...     

Technique of Aluminum Alloy Composite by Inversion Casting

The influence of the temperature of liquid aluminum alloy,the dipping time in liquid alloy and the thickness of base strips on the solidified layer was studied during the process of producing aluminum alloy composite strips used in automobile radizator with inversion casting.It is concluded that there is welding as well as diffusion of alloying elements between the base strip and the coating.Experiments proved that the interface has a good bonding.