共查询到19条相似文献,搜索用时 156 毫秒
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使用3种焊丝ER 5183、ER 5356、ER 5554对6mm 5182-H111铝合金板材进行半自动MIG焊对接试验,通过对焊接接头进行力学性能试验、显微硬度测试及金相组织的观察,探究3种焊丝对5182-H111铝合金组织和性能的影响。结果表明,使用3种焊丝所焊接头中,ER 5183及ER 5356接头抗拉强度均大于ISO 15614-22005要求的焊缝接头系数(1.0),而ER 5554接头焊缝系数仅为0.949;3种焊丝所焊接头硬度均在焊缝区及热影响区有所降低,其中ER 5356所焊接头焊缝强度较其他两种焊丝焊缝区硬度高,为85.5HV;3种焊丝所焊接头组织形貌相近,均存在β(Mg2Al3)强化相,但由于ER 5183与ER 5356焊丝中含有更多的Mg,因此生成了更多的β(Mg2Al3)相,使得焊缝组织更加致密。 相似文献
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采用新型Al-Mg-Sc-Zr焊丝对含钪Al-Zn-Mg-Zr合金薄板材进行MIG焊,借助显微硬度及拉伸性能测试、OM,SEM,TEM等检测手段对焊接接头的微观组织和性能进行研究。结果表明:焊缝区为典型的铸态组织;热影响区靠近焊缝一侧呈现大量细小等轴晶组织,靠近基材区为纤维状组织和少量再结晶组织;基材区为纤维状组织。焊接接头的显微硬度以焊缝为中心呈近似对称,且中心处硬度值最低;抗拉强度为481 MPa,屈服强度为320MPa,伸长率为10.1%,焊接系数约0.83。同时,焊丝和基材中微量的Sc和Zr元素在合金中形成大量细小且与基体共格的Al3(Sc,Zr)粒子,能显著细化晶粒组织,有效抑制再结晶发生,大大改善焊缝区的力学性能。 相似文献
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采用MIG焊的方式使用自制7075铝合金焊丝与市面购进的ER5356焊丝进行3mm厚7075铝合金对接焊,对比分析两种焊丝焊接接头的显微组织与力学性能。经过光学显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)与能谱仪(EDS)结合室温拉伸与显微硬度测试,结果表明:两种接头焊缝组织均为枝晶网状组织,但由于合金元素含量与热导量增大,7075接头焊缝组织相对细小且枝晶特征更为明显。SEM和XRD检测分析得出,由于焊接时金属流动作用将部分母材合金元素带至焊缝,两者焊缝析出相均主要为η相(MgZn2)、S相(CuMgAl2)或T相(AlZnMgCu),同时存在Al13Fe4金属化合物。7075焊缝平均硬度为120HV,相较于5356焊缝更为优异;两者拉伸力学性能较为接近,断裂机制相同。 相似文献
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I. Lum E. Biro Y. Zhou S. Fukumoto D. R. Boomer 《Metallurgical and Materials Transactions A》2004,35(1):217-226
Electrode pitting was investigated in resistance spot welding of 1.5-mm-thick sheet aluminum alloy 5182 using a medium-frequency
direct-current welder and electrodes with a tip face curvature radius of 50 mm and tip face diameter of 10 mm. Detailed investigation
of the metallurgical interactions between the copper electrode and aluminum alloy sheet was carried out using scanning electron
microscopy/energy-dispersive X-ray spectroscopy (SEM/EDX) and X-ray diffraction (XRD). The results indicated that electrode
degradation, which eventually leads to weld failure, proceeded in four basic steps: aluminum pickup, electrode alloying with
aluminum, electrode tip face pitting, and cavitation. Since pitting and cavitation result from Al pickup and alloying, periodic
electrode cleaning could extend electrode tip life by limiting the buildup of Al on the tip face. This work is part of the
effort to improve electrode tip life in resistance spot welding of aluminum alloys for automotive applications. 相似文献
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Optimization of Metal Inert-Gas Welding Process for 5052 Aluminum Alloy by Artificial Neural Network
Pu Jiong Wei Yanhong Xiang Shangzhi Ou Wenmin Liu Renpei 《Russian Journal of Non-Ferrous Metals》2021,62(5):568-579
Russian Journal of Non-Ferrous Metals - 5052 aluminum alloy MIG welding is carried out with filler wire ER5356. The welding for thirty six samples is carried out with three process parameters,... 相似文献
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利用光学显微镜、透射电子显微镜、显微硬度计和万能拉伸试验机等分析手段,表征了Al?Zn?Mg?Cu?Zr?(Sc)合金搅拌摩擦焊(FSW)接头的显微组织和性能,探究了Sc元素对改善超高强Al?Zn?Mg?Cu?Zr合金焊接性能的作用机制。结果表明:Al?Zn?Mg?Cu?Zr?(Sc)合金焊接接头具有相似的组织特征,焊核区为动态再结晶组织,由细小均匀的等轴晶组成,包含较高密度的位错线,大部分时效析出相回溶;热力影响区晶粒被拉长,位错密度更高,残留的时效析出相显著粗化;热影响区保留与母材相同的晶粒形态,大部分时效析出的η'相发生长大,少部分粗化成η相。添加质量分数0.17%的Sc,可以使合金FSW接头抗拉强度提升43 MPa,屈服强度提升23 MPa,断后伸长率改善2.3%,焊接系数达到74.1%。Al3(Sc,Zr)二次析出相可以强烈抑制位错、亚晶界、晶界的移动,细化晶粒的同时保留大量的亚结构,且自身可发挥Orowan弥散强化作用。因此,可通过细晶强化、亚结构强化和弥散强化三种方式显著提高合金FSW接头的力学性能。 相似文献
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为研究焊接材料对Q235B/304双金属复合板焊后性能的影响,采用手工焊条电弧焊方法焊接 Q235B/304双金属复合板,焊接材料分别为THNi317焊条和THA062焊条。利用光学显微镜及EDS(X射线能谱仪)分析了焊接接头金相组织和合金元素在熔合线两侧的分布情况,并进行了焊接接头力学性能试验。结果表明,两种焊条的焊缝组织主要均为奥氏体γ和少量δ铁素体。THNi317焊接材料可以更加有效控制碳元素扩散以及铬和镍合金元素稀释。采用两种焊条获得的焊接接头抗拉强度和硬度均满足标准要求,但是采用THNi317焊条获得的焊缝和热影响区比采用THA062焊条获得的焊缝和热影响区具有更好的冲击韧性。 相似文献
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《Baosteel Technical Research》2010,(Z1):55
When welding the hot-rolled high strength steel manufacture by thermal-mechanical controlled process(TMCP),there has a soften zone in the heat affected zone(HAZ).Evaluate the welding quality though the research on the influence of softened zone’s width,hardness,strength by the different heat input. Take the 8mm thickness QSTE700TM that produced by Baosteel as an example and used the gas metal arc welding(GMAW,the CO2 and Ar as the shield gas) welding method choose the high strength welding wire ER76-G(GB)、ER110S-G(AWS) as the welding consumer.Adjust the welding heat input range from 6.8 kJ/cm to 43.6 kJ/cm and found that as the heat input increased the tensile strength,fatigue strength of the welding structure and the hardness of the HAZ will decreased.But when using the lower heat input the quality of the welding structure can fulfil the usage request splendidly.And give the advise to increased the welding quality in detail:when keep the heat input in the scope of Q =6.8 -20 kJ/cm the good welding quality can be achieved successful.And the further research approve that when usage the lower strength welding consumer such as the ER50-6(GB)、ER70S-G(AWS) the welding structure can also achieved high quality for which the tensile strength can get about 700 MPa when use the lower welding heat input.Thus not only keep the welding quality,but also decreased the cost. 相似文献
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Weld metal composition change during conduction mode laser welding of aluminum alloy 5182 总被引:6,自引:0,他引:6
Selective vaporization of volatile elements during laser welding of automotive aluminum alloys affects weld metal composition
and properties. An experimental and theoretical study was carried out to seek a quantitative understanding of the influences
of various welding variables on vaporization and composition change during conduction mode laser welding of aluminum alloy
5182. A comprehensive model for the calculation of vaporization rate and weld metal composition change was developed based
on the principles of transport phenomena, kinetics, and thermodynamics. The calculations showed that the vaporization was
concentrated in a small high-temperature region under the laser beam where the local vapor pressure exceeded the ambient pressure.
The convective vapor flux driven by the pressure gradient was much higher than the diffusive vapor flux driven by the concentration
gradient. The computed weld pool geometry, vaporization rates, and composition changes for different welding conditions agreed
well with the corresponding experimental data. The good agreement demonstrates that the comprehensive model can serve as a
basis for the quantitative understanding of the influences of various welding variables on the heat transfer, fluid flow,
and vaporization occurring during conduction mode laser welding of automotive aluminum alloys. 相似文献
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Microstructure and mechanical properties of Al-Mg-Mn-Zr-Er weld joints filled with Al-Mg-Mn-Zr and Al-Mg-Mn-Zr-Er weld wires 总被引:1,自引:1,他引:0
The Al-Mg-Mn-Zr-Er alloy sheets with a thickness of 4 mm were welded by TIG welding, the microstructures and mechanical properties of Al-Mg-Mn-Zr-Er alloy weld joints filled with F1.6 mm Al-Mg-Mn-Zr and Al-Mg-Mn-Zr-Er welding wires were studied by optical microscopy, scanning electron microscopy, transmission electron microscopy, hardness testing and tensile mechanical properties testing. The result showed that, the tensile strength increased by 57 MPa and the coefficient of weld joint reached 0.8 when Al-Mg-Mn-Zr-Er welding wire was used as filling material. The tensile strength and elongation of weld joint filled with Al-Mg-Mn-Zr-Er welding wire were 19% and 85% higher those that of filled with Al-Mg-Mn-Zr welding wire respectively, which resulted from grain refinement strengthening and dispersion strengthening of Al3Er. 相似文献