共查询到18条相似文献,搜索用时 187 毫秒
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超高旋转速度搅拌摩擦焊借助超高旋转速度摩擦热量实现了薄板高硅铝合金的连接,这一方法大大降低了搅拌摩擦焊接的轴向力,减小了焊接变形,对焊接薄板铝合金具有独特的优势。文中以焊缝成形质量和焊接接头抗拉强度作为响应值,基于田口法对影响焊接质量的主要焊接工艺参数(旋转速度、焊接速度和下压量)进行试验设计,优化高硅铝合金超高旋转速度搅拌摩擦焊工艺。结果表明,焊接速度和下压量是显著影响因素,最优焊接工艺参数焊接速度为60 cm/min,旋转速度为14 000 r/min,下压量为1.8 mm。这一工艺条件下高硅铝合金超高旋转速度搅拌摩擦焊接接头的最大抗拉强度为129 MPa,达到母材高硅铝合金抗拉强度的97%。 相似文献
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超高旋转速度搅拌摩擦焊借助超高旋转速度摩擦热量实现了薄板高硅铝合金的连接,这一方法大大降低了搅拌摩擦焊接的轴向力,减小了焊接变形,对焊接薄板铝合金具有独特的优势。文中以焊缝成形质量和焊接接头抗拉强度作为响应值,基于田口法对影响焊接质量的主要焊接工艺参数(旋转速度、焊接速度和下压量)进行试验设计,优化高硅铝合金超高旋转速度搅拌摩擦焊工艺。结果表明,焊接速度和下压量是显著影响因素,最优焊接工艺参数焊接速度为60 cm/min,旋转速度为14 000 r/min,下压量为1.8 mm。这一工艺条件下高硅铝合金超高旋转速度搅拌摩擦焊接接头的最大抗拉强度为129 MPa,达到母材高硅铝合金抗拉强度的97%。 相似文献
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搅拌摩擦焊(FSW)是一种固态连接技术,可用来连接高强度铝合金及多种陶瓷颗粒增强金属基复合材料(MMCs)。搅拌摩擦焊获得的陶瓷增强金属基复合材料焊缝优良,在增强体与基体间没有发生有害反应。对搅拌摩擦焊接工艺参数对AA6061-B4C焊接接头抗拉强度的影响进行研究。采用4因素5水平的中心复合设计来控制实验的次数。构建一数学模型来分析搅拌摩擦焊工艺参数对接头抗拉强度的影响。结果表明,在旋转速度1000r/min、焊接速度1.3mm/s、轴向力10kN、增强相含量12%的条件下,搅拌摩擦焊得到的焊接接头的抗拉强度最大。根据构建的模型采用广义简约梯度算法进行优化以得到最大的抗拉强度。金相分析表明,在焊接接头中出现了多种区域,如焊合区、热力影响区和热影响区。在焊合区观察到大量的被细化的铝基体晶粒以及粒径明显减小的B4C颗粒。在热力影响区出现塑性变形、热影响和被拉长的铝晶粒。 相似文献
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利用搅拌摩擦焊方法对7075铝合金板进行焊接,探讨了焊接速度和搅拌头旋转速度等焊接工艺参数对焊缝成形及接头力学性能的影响,并对焊接接头的显微组织进行了分析.结果表明:采用搅拌摩擦焊焊接7075铝合金时,焊接接头具有较好抗拉性能.当旋转速度为750r/min、焊接速度为95 mm/min时,焊接接头的强度最高,达到母材抗拉强度(487 MPa)的97.4%,并且其伸长率也较高(为3.1%);当旋转速度为950 r/min、焊接速度为150 mm/min时焊接接头的伸长率最好,为4.7%.总体上看,焊接接头的伸长率和母材相比较低. 相似文献
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研究了焊接速度、搅拌头转速对AZ31合金搅拌摩擦焊接头显微组织和力学性能的影响,分析了焊接工艺参数的作用机理。结果表明,焊接速度过低(250 mm/min)或者搅拌头转速过高(650、700 r/min),焊核区的条带区中都会产生孔洞缺陷。随着焊接速度的增加,焊核区和热影响区的晶粒尺寸都呈现逐渐减小的趋势,合金的抗拉强度和断后伸长率都表现为先升高后降低的趋势。随着搅拌头转速的增加,焊核区和热影响区的晶粒尺寸都呈现逐渐增加的趋势,合金的抗拉强度和断后伸长率呈现先增加后减小的趋势。AZ31合金适宜的搅拌摩擦焊工艺为焊接速度400 r/min、搅拌头转速550 r/min,此时搅拌摩擦焊接头的抗拉强度和断后伸长率分别为202 MPa和5.0%,断裂位置位于后退侧热影响区。 相似文献
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M. Jayaraman R. Sivasubramanian V. Balasubramanian S. Babu 《Metals and Materials International》2009,15(2):313-320
Fusion welding of cast A319 (Al-Si-Cu) alloy will lead to many problems including porosity, micro-fissuring, and hot cracking.
Friction Stir Welding (FSW) can be used to weld A319 alloy without these defects. In this investigation, an attempt has been
made to study the effect of FSW process parameters on the tensile strength of A319 alloy welded joints. Joints were made using
different combinations of tool rotation speed, welding speed, and axial force, each at four levels. The quality of weld zone
was analyzed using macrostructure and microstructure analysis. Tensile strength of the joints were evaluated and correlated
with the weld zone microstructure. The joint fabricated with a 1200 rpm tool rotation speed, 40 mm/min welding speed, and
4 kN axial force showed superior tensile strength compared with the other joints. 相似文献
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《International Journal of Cast Metals Research》2013,26(5):367-373
AbstractA413 is a high strength eutectic aluminium silicon cast alloy used in the food, chemical, marine, electrical and automotive industries. Fusion welding of these cast alloys can lead to problems such as porosity, microfissuring and hot cracking, etc. However, friction stir welding can be used to weld these cast alloys effectively, without defects. In this investigation, an attempt was made to optimise the friction stir welding process parameters for joining the cast aluminium alloy A413. Joints were made using four levels each of tool rotation speed, welding speed and axial force. The quality of the weld zone was analysed using macrostructure and microstructure analysis. Tensile strength of the joints were evaluated and correlated with the weld zone hardness and microstructure. The joint fabricated using a tool rotation speed of 900 rev min?1, a welding speed of 75 mm min?1 and an axial force of 3 kN showed the best tensile strength. 相似文献
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Silicon carbide particulate (SiCp) reinforced cast aluminium (Al) based metal matrix composites (MMCs) have gained wide acceptance in the fabrication of light weight structures requiring high specific strength, high temperature capability and good wear resistance. Friction stir welding (FSW) process parameters play major role in deciding the performance of welded joints. The ultimate tensile strength, notch tensile strength and weld nugget hardness of friction stir butt welded joints of cast Al/SiCp MMCs (AA6061 with 20% (volume fraction) of SiCp) were investigated. The relationships between the FSW process parameters (rotational speed, welding speed and axial force) and the responses (ultimate tensile strength, notch tensile strength and weld nugget hardness) were established. The optimal welding parameters to maximize the mechanical properties were identified by using desirability approach. From this investigation, it is found that the joints fabricated with the tool rotational speed of 1370 r/min, welding speed of 88.9 mm/min, and axial force of 9.6 kN yield the maximum ultimate tensile strength, notch tensile strength and hardness of 265 MPa, 201 MPa and HV114, respectively. 相似文献
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研究了采用不同焊接参数时ZL114A铸铝搅拌摩擦焊接头的金相组织、硬度分布及力学性能。结果表明,ZL114A铸铝的搅拌摩擦焊焊接性良好。焊核区的微观组织是无方向性的、细小的等轴晶粒。细化的硅粒子均匀布满整个焊核区。与粗大的树枝状母材相比,焊核晶粒细小、均匀而致密,没有观察到气孔等缺陷。焊缝区硬度分布较母材稳定,变化范围小。随着焊速增加,硅粒子所占体积比逐渐下降。热一机械影响区晶粒被拉长。接头的力学性能与焊接参数的匹配有关系。采用高焊速及转速与焊速比在3左右,获得的接头抗拉强度可达到母材的91%。焊后经T6热处理,可与同炉热处理母材等强。 相似文献
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S. Babu K. Elangovan V. Balasubramanian M. Balasubramanian 《Metals and Materials International》2009,15(2):321-330
AA2219 aluminium alloy (Al-Cu-Mn alloy) has gathered wide acceptance in the fabrication of lightweight structures requiring
a high strength-to-weight ratio and good corrosion resistance. In contrast to the fusion welding processes that are routinely
used for joining structural aluminium alloys, the friction stir welding (FSW) process is an emerging solid state joining process
in which the material that is being welded does not melt and recast. This process uses a non-consumable tool to generate frictional
heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, axial force etc., and
the tool pin profile play a major role in determining the joint strength. An attempt has been made here to develop a mathematical
model to predict the tensile strength of friction stir welded AA2219 aluminium alloy by incorporating FSW process parameters.
A central composite design with four factors and five levels has been used to minimize the number of experimental conditions.
The response surface method (RSM) has been used to develop the model. The developed mathematical model has been optimized
using the Hooke and Jeeves search technique to maximize the tensile strength of the friction stir welded AA2219 aluminium
alloy joints. 相似文献
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文中通过工艺试验研究了DH36钢水下摩擦塞焊工艺窗口及焊接接头的显微组织和力学性能。结果表明,在焊接转速较低时,焊接接头根部容易形成“未结合”焊接缺陷,提高焊接转速可有效避免缺陷的形成;焊接转速为7500r/min、轴向压力在30~45kN范围是较适宜的焊接工艺参数;焊接接头焊缝组织主要为板条马氏体和贝氏体,焊接热影响区的组织主要为贝氏体;焊接接头的拉伸性能和冲击性能均随焊接转速的提高有不同程度升高,但随轴向压力的变化不具有明显规律性;在较优的焊接工艺参数下(焊接转速7500r/min、轴向压力40kN)焊接接头屈服强度为370MPa,抗拉强度为530MPa,断后伸长率为22.5%,结合线处0℃冲击吸收功为42.5J。 相似文献
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Rajesh Kumar Gupta Hrishikesh Das Tapan Kumar Pal 《Journal of Materials Engineering and Performance》2012,21(8):1645-1654
Friction stir welding (FSW), a promising solid state joining process invented at TWI in 1991, was used to join 9?mm thick 7475 aluminum alloy which is considered essentially unweldable by fusion processes. In the present work, the process parameters such as tool rotational speed were varied from 300 to 1000?rpm for a travel speed of 50?mm/min and the influence of process parameters in terms of energy input on microstructure, hardness, tensile strength, and the corrosion property of 7475 aluminum joints was evaluated and analyzed. The maximum tensile strength of FSW joints was obtained at rotational speed of 400?rpm and traverse speed of 50?mm/min (59.2?kJ) which attributed maximum stirred zone area and maximum hardness. The maximum corrosion resistance properties of weld in 3.5% NaCl solution, however, were obtained at rotational speed of 1000?rpm and traverse speed of 50?mm/min. Furthermore, for a given weld, stirred zone showed improved corrosion properties than TMAZ. 相似文献