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Microstructure and mechanical characteristics of AA6061-T6 joints produced by friction stir welding,friction stir vibration welding and tungsten inert gas welding:A comparative study 被引量:5
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作者 Behrouz Bagheri Mahmoud Abbasi Amin Abdollahzadeh 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第3期450-461,共12页
This study compared the microstructure and mechanical characteristics of AA6061-T6 joints produced using friction stir welding(FSW),friction stir vibration welding(FSVW),and tungsten inert gas welding(TIG).FSVW is a m... This study compared the microstructure and mechanical characteristics of AA6061-T6 joints produced using friction stir welding(FSW),friction stir vibration welding(FSVW),and tungsten inert gas welding(TIG).FSVW is a modified version of FSW wherein the joining specimens are vibrated normal to the welding line during FSW.The results indicated that the weld region grains for FSVW and FSW were equiaxed and were smaller than the grains for TIG.In addition,the weld region grains for FSVW were finer compared with those for FSW.Results also showed that the strength,hardness,and toughness values of the joints produced by FSVW were higher than those of the other joints produced by FSW and TIG.The vibration during FSW enhanced dynamic recrystallization,which led to the development of finer grains.The weld efficiency of FSVW was approximately 81%,whereas those of FSW and TIG were approximately 74%and 67%,respectively. 展开更多
关键词 friction stir welding VIBRATION tungsten inert gas welding mechanical characteristics MICROSTRUCTURE
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Microstructure and mechanical properties of friction pull plug welding for2219-T87 aluminum alloy with tungsten inert gas weld 被引量:3
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作者 Zhen Shao Lei Cui +4 位作者 Lijun Yang Peng Lu Huimiao Wang Zhuanping Sun Jianling Song 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2022年第6期1216-1224,共9页
The friction pull plug welding(FPPW)of the 2219-T87 tungsten inert gas(TIG)welded joint was investigated,and the microstructures,precipitate evolution,mechanical properties,and fracture morphologies of this joint were... The friction pull plug welding(FPPW)of the 2219-T87 tungsten inert gas(TIG)welded joint was investigated,and the microstructures,precipitate evolution,mechanical properties,and fracture morphologies of this joint were analyzed and discussed.In this study,defectfree joints were obtained using a rotational speed of 7000 r/min,an axial feeding displacement of 12 mm,and an axial force of 20-22 kN.The results indicated that within these welding parameters,metallurgical bonding between the plug and plate is achieved by the formation of recrystallized grains.The microstructural features of the FPPW joint can be divided into different regions,including the heat-affected zone(HAZ),thermomechanically affected zone(TMAZ),recrystallization zone(RZ),heat-affected zone in the TIG weld(TIG-HAZ),and the thermomechanically affected zone in the TIG weld(TIG-TMAZ).In the TIG-TMAZ,the grains were highly deformed and elongated due to the shear and the extrusion that produces the plug during the FPPW process.The main reason for the softening in the TMAZ is determined to be the dissolution ofθ’and coarsening ofθprecipitate particles.In a tensile test,the FPPW joint welded with an axial force of 22 kN showed the highest ultimate tensile strength of 237 MPa.The locations of cracks and factures in the TIG-TMAZ were identified.The fracture morphology of the tensile sample showed good plasticity and toughness of the joints. 展开更多
关键词 friction pull plug welding tungsten inert gas weld microstructures constituent particles mechanical properties
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Influence of arc pressure on the forming of molten pool in tungsten inert gas arc butt welding with micro gap for tantalum sheet
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作者 周方明 钱乙余 《China Welding》 EI CAS 2006年第3期64-67,共4页
Arc pressure is the key influencing factor to forming of molten pool. Countering the characteristic of tungsten inert gas arc welding with micro gap for tantalum sheet, according to the fundament of arc physics, a dis... Arc pressure is the key influencing factor to forming of molten pool. Countering the characteristic of tungsten inert gas arc welding with micro gap for tantalum sheet, according to the fundament of arc physics, a distribution model of arc pressure and forming mechanism of molten pool with micro butt gap are proposed, and the influences of arc pressure on forming of molten pool are discussed. Experimental researches for the dynamic formation process of weld molten pool by using high-speed vidicon camera show that when butt gap is appropriate, that is from 0. 1 to 0. 15 mm, molten metals formed on two workpiece uplift and grow up first, then are fused and form uniform molten pool finally. 展开更多
关键词 arc pressure tantalum sheet micro butt gap tungsten inert gas welding mechanism of forming
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The effect of activating fluxes on the cathode spots in the activating TIG welding 被引量:1
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作者 黄勇 王伯洋 +4 位作者 郭建航 刘永刚 黄健康 樊丁 余淑荣 《China Welding》 CAS 2023年第1期7-17,共11页
The cathode spots are a common phenomenon in the TIG(tungsten inert gas)welding process.However,it is rarely observed in the activating TIG welding process.This research is mainly focused on the effect of activating f... The cathode spots are a common phenomenon in the TIG(tungsten inert gas)welding process.However,it is rarely observed in the activating TIG welding process.This research is mainly focused on the effect of activating flux on cathode spots in the activating TIG welding.The characteristics and behaviors of cathode spots were investigated in activating TIG welding by the high-speed camera and the spectrograph.Three kinds of oxide(TiO_(2),SiO_(2),MnO_(2))and two halide(MnCl_(2),CaF_(2))activating fluxes are used in the activating TIG welding process.The results show that differ from the TIG welding,the oxide activating flux increases the number of cathode spots and decreases the velocity.The effect is the opposite for the halide activating flux.Moreover,the number of spots no longer varies with the current except TiO2 activating flux.As the temperature of the weld pool surface increases the spot moves away from the center.But this rule is not valid when silica and manganese compounds activating fluxes are used.The variation of cathode spots is caused by the oxide film reformed and the distribution of weld slag.The formation mechanism of cathode spots might be the impact of ions on the cathode surface and the strong electric field formed near the cathode surface. 展开更多
关键词 cathode spots behaviors activating tungsten inert gas welding high-speed photography spectrum
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Liquation cracking in the heat-affected zone of IN939 superalloy tungsten inert gas weldments 被引量:4
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作者 Hassan Kazempour-Liasi Mohammad Tajally Hassan Abdollah-Pour 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2020年第6期764-773,共10页
The main aim of this study was to investigate liquation cracking in the heat-affected zone(HAZ)of the IN939 superalloy upon tungsten inert gas welding.A solid solution and age-hardenable filler metals were further stu... The main aim of this study was to investigate liquation cracking in the heat-affected zone(HAZ)of the IN939 superalloy upon tungsten inert gas welding.A solid solution and age-hardenable filler metals were further studied.On the pre-weld heat-treated samples,upon solving the secondaryγ′particles in the matrix,primaryγ′particles in the base metal grew to"ogdoadically diced cubes"of about 2μm in side lengths.The pre-weld heat treatment reduced the hardness of the base metal to about HV 310.Microstructural studies using optical and fieldemission scanning electron microscopy revealed that the IN939 alloy was susceptible to liquation cracking in the HAZ.The constitutional melting of the secondary,eutectic,and Zr-rich phases promoted the liquation cracking in the HAZ.The microstructure of the weld fusion zones showed the presence of fine spheroidalγ′particles with sizes of about 0.2μm after the post-weld heat treatment,which increased the hardness of the weld pools to about HV 350 and 380 for the Hastelloy X and IN718 filler metals,respectively.Application of a suitable solid solution filler metal could partially reduce the liquation cracking in the HAZ of IN939 alloy. 展开更多
关键词 SUPERALLOY tungsten inert gas WELD heat-affected zone liquation cracking
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Microstructure analysis and mechanical characteristics of tungsten inert gas and metal inert gas welded AA6082-T6 tubular joint: A comparative study 被引量:2
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作者 E.R.IMAM FAUZI M.S.CHE JAMIL +1 位作者 Z.SAMAD P.MUANGJUNBUREE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第1期17-24,共8页
The present study is aimed to compare the microstructure characteristics and mechanical properties of AA6082 in T6 condition of tubular joints fabricated by tungsten inert gas welding (TIG) and metal inert gas weldi... The present study is aimed to compare the microstructure characteristics and mechanical properties of AA6082 in T6 condition of tubular joints fabricated by tungsten inert gas welding (TIG) and metal inert gas welding (MIG) processes. The effect of welding processes was analysed based on optical microscopy image, tensile testing, and Vickers micro-hardness measurements. The results showed that the tensile strengths of the TIG-welded joints were better than those of the MIG-welded joints, due to the contribution of fine equiaxed grains formation with narrower spacing arms. In terms of joint efficiency, the TIG process produced more reliable strength, which was about 25% higher compared to the MIG-joint. A significant decay of hardness was recorded in the adjacent of the weld bead zone, shown in both joints, related to phase transformation, induced by high temperatures experienced by material. A very low hardness, which was about 1.08 GPa, was recorded in the MIG-weldcd specimens. The extent of the heat-affected-zone (HAZ) in the MIG-welded joints was slightly wider than those of the TIG-welded specimens, which corresponded with a higher heat input per unit length. 展开更多
关键词 AA6082 aluminium alloy tungsten inert gas tig metal inert gas (MIG) mechanical properties microstructure analysis
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Effect of Pulsed Current TIG Welding Parameters on Pitting Corrosion Behaviour of AA6061 Aluminium Alloy 被引量:5
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作者 T.Senthil Kumar V.Balasubramanian +1 位作者 M.Y.Sanavullah S.Babu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2007年第2期223-229,共7页
Medium strength aluminium alloy (Al-Mg-Si alloy) has gathered wide acceptance in the fabrication of light weight structures requiring a high strength-to weight ratio, such as transportable bridge girders, military v... Medium strength aluminium alloy (Al-Mg-Si alloy) has gathered wide acceptance in the fabrication of light weight structures requiring a high strength-to weight ratio, such as transportable bridge girders, military vehicles, road tankers and railway transport systems. The preferred welding process for aluminium alloy is frequently TIG (tungsten inert gas) welding due to its comparatively easier applicability and better economy.In the case of single pass TIG welding of thinner section of this alloy, the pulsed current has been found beneficial due to its advantages over the conventional continuous current process. The use of pulsed current parameters has been found to improve the mechanical properties of the welds compared to those of continuous current welds of this alloy due to grain refinement occurring in the fusion zone. A mathematical model has been developed to predict pitting corrosion potential of pulsed current TIG welded AA6061 aluminium alloy.Factorial experimental design has been used to optimize the experimental conditions. Analysis of variance technique has been used to find out the significant pulsed current parameters. Regression analysis has been used to develop the model. Using the developed model pitting corrosion potential values have been estimated for different combinations of pulsed current parameters and the results are analyzed in detail. 展开更多
关键词 Pulsed current tungsten inert gas welding Medium strength aluminium alloy Pitting corrosion Design of experiments Analysis of variance
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Metal vapor behavior in double electrodes TIG welding 被引量:1
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作者 Wang Xinxin Luo Yi Fan Ding 《China Welding》 EI CAS 2018年第3期27-34,共8页
In present paper, the metal vapour behavior in double electrodes TIG welding was investigated by a numerical model, including the arc plasma and weld pool. The thermodynamic parameters and transport coefficients of th... In present paper, the metal vapour behavior in double electrodes TIG welding was investigated by a numerical model, including the arc plasma and weld pool. The thermodynamic parameters and transport coefficients of the arc plasma were dependent on both the local temperature and the mass ratio of the metal vapour. A second viscosity approximation was used to formulate the diffusion coefficient of the metal vapour in the arc plasma. The temperature and flow fields together with the metal vapour concentration were simulated, and the influences of metal vapour on the arc plasma and the weld pool were analyzed. It was found that the metal vapour transport in the arc plasma was significantly influenced by the flow of the arc plasma, and the distribution of the metal vapour was more extended in the direction perpendicular to the line through the double electrodes tips. Both the arc plasma and the heat flux at the weld pool were constricted by the presence of the metal vapour, while the metal vapour had a minor effect on the total heat input to the work piece and the weld pool profile as a whole. 展开更多
关键词 metal vapour double electrodes tungsten inert gas welding heat input
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Diagnosis of TIG welding based on ultraviolet radiation
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作者 李志勇 顾小燕 王宝 《China Welding》 EI CAS 2009年第2期6-11,共6页
Through collecting the radiation of tungsten inert gas (TIG) welding arc, the radiation distribution in ultraviolet zone is analyzed in order to study the variation rule of ultraviolet radiation versus welding condi... Through collecting the radiation of tungsten inert gas (TIG) welding arc, the radiation distribution in ultraviolet zone is analyzed in order to study the variation rule of ultraviolet radiation versus welding condition. The explanation for the variation is also provided based on spectral radiation theory of arc light. Furthermore, through analysis of disturbance factors, the integral intensity signal of radiation in ultraviolet zone is applied for diagnosis of welding process. The spectral signal of ultraviolet radiation can reflect the disturbance factors and welding conditions, which can be used for online diagnosis of welding process. 展开更多
关键词 arc spectrum ultraviolet zone tungsten inert gas welding disturbance factor
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A Fuzzy Logic Approach to Predict Tensile Strength in TIG Mild Steel Welds
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作者 Ademola Adebiyi Oyinbade Kehinde Ademola Imoukhuede Abdulateef Olufolahan Akadiri 《World Journal of Engineering and Technology》 2023年第2期199-207,共6页
Welding defects influence the desired properties of welded joints giving fabrication experts a common problem of not being able to produce weld structures with optimal strength and quality. In this study, the fuz... Welding defects influence the desired properties of welded joints giving fabrication experts a common problem of not being able to produce weld structures with optimal strength and quality. In this study, the fuzzy logic system was employed to predict welding tensile strength. 30 sets of welding experiments were conducted and tensile strength data was collected which were converted from crisp variables into fuzzy sets. The result showed that the fuzzy logic tool is a highly effective tool for predicting tensile strength present in TIG mild steel weld having a coefficient of determination value of 99%. 展开更多
关键词 Tensile Strength PREDICT Steel Fuzzy Logic tungsten inert gas welding
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Comparison of FSW and TIG welded joints in Al-Mg-Mn-Sc-Zr alloy plates 被引量:10
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作者 何振波 彭勇宜 +1 位作者 尹志民 雷学锋 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第8期1685-1691,共7页
In order to study the welding process,microstructure and properties of Al-Mg-Mn-Sc-Zr alloy,comparative methods of friction stir welding(FSW) and tungsten inert gas(TIG) were applied to the two conditions of this ... In order to study the welding process,microstructure and properties of Al-Mg-Mn-Sc-Zr alloy,comparative methods of friction stir welding(FSW) and tungsten inert gas(TIG) were applied to the two conditions of this alloy,namely hot rolled plate and cold rolled-annealed plate.The relationships between microstructures and properties of the welded joints were investigated by means of optical microscopy and transmission electron microscopy.Compared with the base metal,the strength of FSW and TIG welded joints decreased,and the FSW welding coefficients were higher than the TIG welding coefficients.The loss of substructure strengthening and a very little loss of precipitation strengthening of Al3(Sc,Zr) cause the decreased strength of FSW welded joint.But for the TIG welded joint,the disappearance of both the strain hardening and most precipitation strengthening effect of Al3(Sc,Zr) particles contributed to its softening.At the same time,the grains in weld nugget zone of FSW welded joints were finer than those in the molten zone of TIG welded joints. 展开更多
关键词 Al-Mg-Mn-Sc-Zr friction stir welding tungsten inert gas welded joints
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TIG焊电弧-熔池传热与流动数值模拟 被引量:17
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作者 王新鑫 樊丁 +1 位作者 黄健康 黄勇 《机械工程学报》 EI CAS CSCD 北大核心 2015年第10期69-78,共10页
针对钨极惰性气体保护(Tungsten inert gas,TIG)焊,采用一组满足整个求解域的偏微分方程组和合理的边界条件,建立包括钨极、电弧和母材的三维瞬态统一模型。以SUS304不锈钢为母材,求解获得电弧-电极(熔池)的温度场、流场、压力、电流密... 针对钨极惰性气体保护(Tungsten inert gas,TIG)焊,采用一组满足整个求解域的偏微分方程组和合理的边界条件,建立包括钨极、电弧和母材的三维瞬态统一模型。以SUS304不锈钢为母材,求解获得电弧-电极(熔池)的温度场、流场、压力、电流密度、电磁力等结果,并与已有的试验结果和其他相关的研究结果做对比。在此基础上,通过分析阳极热输入,求得焊接热效率为86.3%。重点比较浮力、电磁力、等离子流拉力和Marangoni剪切力单独作用下的熔池流动特性,并将计算结果和格拉晓夫数Gr、磁雷诺数Rm和表面张力雷诺数Ma相结合,分析了这几种驱动力的相对作用大小,将计算结果和Peclet数Pe相结合强调了熔池热对流与热传导的相对作用。结果表明,与等离子拉力和Marangoni剪切力相比,浮力和电磁力对熔池对流的作用较小;等离子拉力和Marangoni剪切力处于同一数量级,而Marangoni剪切力大于等离子流拉力,两者共同作用使熔池表面金属由内向外流动。与热传导相比,熔池金属这种向外流动导致的热对流主导传热过程,是造成TIG焊宽而且浅的焊缝形貌的本质原因。 展开更多
关键词 钨极惰性气体保护焊 统一模型 相对作用 流动 传热
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5554铝合金TIG焊缝组织与性能 被引量:9
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作者 汪洪峰 左敦稳 +1 位作者 王宏宇 邵定林 《南京航空航天大学学报》 EI CAS CSCD 北大核心 2010年第6期753-757,共5页
针对厚度为10 mm的5554铝合金进行TIG焊接试验研究,分析焊缝的组织结构及力学性能。结果表明,在选用S311焊丝的焊接试样中,焊接试样的抗拉强度和屈服强度均在母材的50%左右,断后伸长率为母材的65.4%。通过拉伸断口扫描电镜观察,5554铝... 针对厚度为10 mm的5554铝合金进行TIG焊接试验研究,分析焊缝的组织结构及力学性能。结果表明,在选用S311焊丝的焊接试样中,焊接试样的抗拉强度和屈服强度均在母材的50%左右,断后伸长率为母材的65.4%。通过拉伸断口扫描电镜观察,5554铝合金及其焊接试样的拉伸断口均为韧窝断裂断口,断裂为韧性断裂。对焊接试样各区域的显微硬度测试,显示焊缝区域硬度高于其他部位,其中熔合线和热影响区之间的显微硬度最低。并且焊接试样的整体区域硬度均比未焊接的母材低,通过试验验证,得出焊接后的退火消除应力热处理是导致这一结果的主要原因。 展开更多
关键词 金属材料 微观组织 力学性能 5554铝合金 惰性气体钨极保护焊(tig)
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Fracture behavior of double-pass TIG welded 2219-T8 aluminum alloy joints under transverse tensile test 被引量:5
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作者 李权 吴爱萍 +3 位作者 赵玥 王国庆 鄢东洋 吴会强 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第6期1794-1803,共10页
2219-T8 aluminum alloys were butt welded by the double-pass tungsten inert gas (TIG) arc welding process. The transverse tensile test of the joint showed that the fracture mainly occurred in the partially melted zo... 2219-T8 aluminum alloys were butt welded by the double-pass tungsten inert gas (TIG) arc welding process. The transverse tensile test of the joint showed that the fracture mainly occurred in the partially melted zone (PMZ). Effects of the PMZ on the fracture behavior were systematically studied. Continuous intergranular eutectics were observed in the PMZ close to the fusion line. Away from the fusion line, the intergranular eutectics in the PMZ became discontinuous. The fracture morphology and the microhardness distribution of the joint showed that the PMZ was gradient material with different mechanical properties, which strongly affected the fracture process. It was observed that the crack initiated in the PMZ near the front weld toe, and propagated in the PMZ away from the fusion line. Then, the crack tip was blunt when it propagated into the PMZ with higher plasticity. Finally, the rest part of the joint was shear fractured. 展开更多
关键词 2219 aluminum alloy tungsten inert gas arc welding partially melted zone fracture behavior
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AZ71镁合金TIG焊焊接接头微观组织与力学性能 被引量:9
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作者 武婧亭 游国强 +1 位作者 郭强 龙思远 《热加工工艺》 CSCD 北大核心 2011年第1期117-118,122,共3页
采用钨极氩弧焊接方法对2.2mm厚镁合金AZ71薄板进行焊接加工。焊后对接头进行拉伸试验和硬度测试,结果表明:采用90A的电流焊接时,接头抗拉性能最好(281.23MPa),达到母材的89.58%。断裂发生在焊缝区,焊接接头断口呈准解理断口,接近解理断... 采用钨极氩弧焊接方法对2.2mm厚镁合金AZ71薄板进行焊接加工。焊后对接头进行拉伸试验和硬度测试,结果表明:采用90A的电流焊接时,接头抗拉性能最好(281.23MPa),达到母材的89.58%。断裂发生在焊缝区,焊接接头断口呈准解理断口,接近解理断口;母材断裂为延性断裂,断口呈韧窝断口;焊缝区显微硬度最高,其次是母材,热影响区硬度最低。 展开更多
关键词 AZ71镁合金 tig 焊接接头 抗拉强度 硬度
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WC-Co系硬质合金TIG焊接头界面扩散分析 被引量:5
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作者 徐培全 杨德新 +2 位作者 赵秀娟 芦凤桂 姚舜 《上海交通大学学报》 EI CAS CSCD 北大核心 2005年第7期1050-1054,共5页
采用Ni-Fe-C填充材料对WC-30Co硬质合金与45钢的钨极氩弧(TIG)焊进行了研究,观察分析了焊接接头的组织形貌,提出了块体界面扩散的板片模型和管道模型,并采用板片模型对WC-30Co硬质合金与钢TIG焊焊接的WC-30Co/焊缝界面的各元素的扩散行... 采用Ni-Fe-C填充材料对WC-30Co硬质合金与45钢的钨极氩弧(TIG)焊进行了研究,观察分析了焊接接头的组织形貌,提出了块体界面扩散的板片模型和管道模型,并采用板片模型对WC-30Co硬质合金与钢TIG焊焊接的WC-30Co/焊缝界面的各元素的扩散行为进行了分析.界面显微观察结果表明,采用Ni-Fe-C合金作为填充金属获得了良好的焊接接头,焊缝与WC-30Co硬质合金之间发生界面扩散,在界面原子间机械力的作用下,发生了牢固的冶金结合.利用多项式进行曲线拟合,并用Matlab进行计算,可以解决焊接过程时间参数过小而无法应用板片模型的困难,是一种可行的数据处理方法.采用板片模型可以有效地描述界面元素的扩散行为,η相周围基体中元素较强的扩散能力是其形成的重要原因. 展开更多
关键词 硬质合金 钨极氩弧焊接 界面扩散
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焊接接头TIG熔修的疲劳强度及低温性能研究 被引量:4
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作者 李冬霞 贾宝春 +1 位作者 邱太生 周金锁 《机械强度》 CAS CSCD 北大核心 2005年第1期126-129,共4页
以海洋石油钻井平台桩腿所用的普通低合金钢角焊缝为例 ,研究TIG (tungsteninert gasarc)熔修对焊接接头性能的影响。TIG熔修可提高接头疲劳强度及低温性能 ,其效果取决于熔修工艺及规范。文中对多种规范的TIG熔修试样和未熔修试样 ,进... 以海洋石油钻井平台桩腿所用的普通低合金钢角焊缝为例 ,研究TIG (tungsteninert gasarc)熔修对焊接接头性能的影响。TIG熔修可提高接头疲劳强度及低温性能 ,其效果取决于熔修工艺及规范。文中对多种规范的TIG熔修试样和未熔修试样 ,进行疲劳试验及落锤试验 ,推出疲劳寿命公式 ,并得到S—N曲线 ,确定了本试验条件下的最佳工艺规范参数 ,应用该工艺参数可提高疲劳强度 189% ,降低脆性开裂温度 70℃。该熔修工艺已试用于海洋平台实际结构的桩腿裂纹补焊修复中 ,使补焊焊缝的疲劳寿命大幅度提高 。 展开更多
关键词 tig(tungsten inert-gas arc)熔修规范 角焊缝 疲劳强度 S-N曲线 脆性开裂温度
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双DSP并行控制的超音频脉冲TIG焊机及其适用性 被引量:3
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作者 黄松涛 齐铂金 +1 位作者 许海鹰 焦向东 《中国机械工程》 EI CAS CSCD 北大核心 2010年第4期486-490,共5页
基于两套桥式逆变直流回路并联调制模式的新型主回路,采用双数字信号处理器并行全数字控制方式研制了新型大功率超音频直流脉冲TIG焊机。该焊机脉冲电流的上升沿和下降沿变化速率不小于50A/μs,脉冲频率可达30kHz以上。适用性试验表明,... 基于两套桥式逆变直流回路并联调制模式的新型主回路,采用双数字信号处理器并行全数字控制方式研制了新型大功率超音频直流脉冲TIG焊机。该焊机脉冲电流的上升沿和下降沿变化速率不小于50A/μs,脉冲频率可达30kHz以上。适用性试验表明,该焊机产生的超音频脉冲电弧具有电弧超声作用和电弧高频效应,对提高焊缝接头质量与性能有明显作用。 展开更多
关键词 超音频脉冲 tig 并行控制 电弧超声
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304不锈钢旋转双焦点激光-TIG复合焊接 被引量:3
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作者 李晓辉 汪苏 夏彩云 《北京航空航天大学学报》 EI CAS CSCD 北大核心 2008年第4期431-434,共4页
为了提高激光-电弧复合焊接质量,提出了一种新的焊接方法——旋转双焦点激光-TIG(Tungsten InertGas)复合焊接.运用自行研制的旋转双焦点激光-TIG复合焊接头对304不锈钢进行了不同焊接参数下的工艺试验,并分析了焊接参数对焊缝成形的影... 为了提高激光-电弧复合焊接质量,提出了一种新的焊接方法——旋转双焦点激光-TIG(Tungsten InertGas)复合焊接.运用自行研制的旋转双焦点激光-TIG复合焊接头对304不锈钢进行了不同焊接参数下的工艺试验,并分析了焊接参数对焊缝成形的影响.结果表明在旋转双焦点激光-TIG复合焊接过程中,焊接电流和激光功率的大小和相互配合是2个热源能否有效耦合的关键因素,而旋转频率的大小对焊缝的熔深、熔宽影响不大,通过旋转双焦点激光和电弧的耦合作用可以有效地提高焊接热源的利用率. 展开更多
关键词 不锈钢 激光焊接 钨极惰性气体(tig) 旋转双焦点
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铝合金TIG焊自适应控制方法 被引量:5
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作者 王建军 陈善本 《上海交通大学学报》 EI CAS CSCD 北大核心 2010年第S1期160-162,166,共4页
通过分析铝合金焊接过程的特点,将随机系统理论引入焊接过程,建立了焊接参数与熔池几何参数之间的随机系统模型.针对铝合金TIG焊特点,设计了基于电流最小方差调节的焊缝熔宽自适应控制器,通过实时调控焊接电流,使其适应焊接过程散热条... 通过分析铝合金焊接过程的特点,将随机系统理论引入焊接过程,建立了焊接参数与熔池几何参数之间的随机系统模型.针对铝合金TIG焊特点,设计了基于电流最小方差调节的焊缝熔宽自适应控制器,通过实时调控焊接电流,使其适应焊接过程散热条件的随机变化.焊接试验结果表明,电流自适应控制方法可以实现对铝合金TIG焊缝成型的良好控制. 展开更多
关键词 铝合金 tig 随机模型 自适应控制
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