最新刊期
期 10 ， 2020
- 摘要：The butt joints of dissimilar materials（1060-O aluminum alloy,T2 copper）were welded by two kinds of friction stir welding. The effects of two different rotation speeds on the mi crostructure and mechanical properties of the joint were studied by means of metallographic observation,microhardness test,tensile test and SEM fracture scanning,and the microstructure of fracture was also analyzed. The results show that the cross section macromorphology of the dissimilar FSW joint is characterized by the interpenetrating and mixing of the two base metals. The copper alloy particles are dispersed in the aluminum alloy matrix in the nugget zone（NZ）,and the aluminum copper intermetallic compound（IMC）forms at the interface of the two metals in the NZ. The embedded layer depth of copper in the NZ of higher-speed aluminum copper welding joint is larger,the microstructure of the TMAZ on the aluminum side is stirred more violently,and the grains are elongated and twisted more obviously. The mechanical properties of high-speed joints are better than those of lower-speed joints,which have higher joint hardness and tensile properties.关键词：friction stir welding;aluminum copper welding;rotation speed;mechanical properties
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发布时间：2022-03-15 - 摘要：By theoretical instability calculation and physical bearing test,a small load-bearing cylindrical truss with 180 mm height is designed,which consisting of six groups of vertical rods and three rings. The three rings with diameter of 56 mm are located at the top,the bottom and the middle of the truss respectively,and the middle ring is made of steel bars with a slightly smaller diameter than the upper and lower rings. The six groups of vertical rods are arranged uniformly along the circumference,and the two vertical rods in each group is located inside and outside of the rings respectively,and in the same shaft section of the columns truss. The butt joints of the rings are welded by TIG welding,while the joints between the rings and the vertical rods are welded by resistance spot welding. The maximum load bearing capacity of the truss is 17 800 N,and the ratio of the maximum load bearing capacity to the mass is 82 N/g.关键词：column truss;load bearing;structural design;welding performance
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发布时间：2022-03-15 - 摘要：In order to improve the bonding strength of the surface coating of the deflector and prolong its service life,four kinds of Ni-Al composite coatings were prepared on 6061-T6 aluminum alloy by twin-wire arc spraying technology. The bonding strength properties of four different composite coatings were studied. At the same time,the appearances of fracture and section of the coating were observed,and the failure reasons were analyzed. The results show that the bonding strength of Ni-Al composite coating with Ni-5 wt.%Al as bottom layer and Ni-20 wt.% Al as surface layer is higher,and the bonding strength of the composite coating meets the performance index requirements.关键词：6061-T6 aluminum alloy;arc spraying;composite coating;bonding strength
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发布时间：2022-03-15 - 摘要：The butt joining test of heavy thickness precipitation hardening stainless steel was conducted by double sided TIG welding and the microstructure and mechanical properties of the joints were analyzed. The results show that there is no crack and pore in welds. Grain is refined in weld zone after heat treatment,microstructure difference due to heat difference in heat-affected zone disappears,the joints has solid-solution microstructure. The tensile strength test show that tensile strength of joints increases by 5.5% and elongation increases by 63% after heat treatment. Fracture analysis shows that the fracture of joint exhibits typical ductile dimple fracture pattern and is mainly dimple.关键词：precipitation hardening stainless steel;double sided welding;microstructure;tensile strength
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发布时间：2022-03-15 - 摘要：In this paper,the Mg-3Zn-0.5Y alloy weld in good shape and defect-free was produced by friction stir welding,and the influence of welding parameters on the microstructure and mechanical properties of the welded joint was studied. As a result,when the welding speed is 110 mm/min,the well-formed weldcan be obtained with the rotation rate at 600 ～1300 r/min. The tensile properties of the joints first increase and then decrease in the range. When the rotational speed of 1 100 r/min,the well-formed weld can be obtained with the rotation rate at 90～1 300 mm/min. With the increase of rotating speed,the joint strength increases first and then decreases. Brittle fracture and ductile fracture can be observed simultaneously. Good comprehensive mechanical properties can be obtained when the rotation rate was 1 100 r/min and the welding speed was 110 mm/min,the tensile strength was 222.5 MPa,the yield strength was 173.8 MPa.关键词：FSW;Mg-Zn-Y alloys;microstructure;mechanical property
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发布时间：2022-03-15 - 摘要：TIG arc additive manufacturing forming tests were carried out on Q235 A low carbon steel substrate using ER316L stainless steel welding wire. Heat treatment at 1 000 ℃and 1 200 ℃ was performed to study the effect of heat treatment temperature on the microstructure and properties of the parts manufactured by the additive manufacturing. The results has shown that the sample without heat treatment was expected to be austenite +dendritic ferrite +M23C6. Heat treatment can remelt the M23C6. And the quality of the M23C6 decreased with the increase of temperature,which resulted in a decrease in the hardness of sample. The ferrite was gradually transformed into austenite during the heat treatment,and its morphology changed significantly:the ferrite exhibited a strip-like structure with the heat treatment at 1 000 ℃,and exhibited a spot-like structure with the heat treatment at 1200 ℃. The tensile strength of sample reached the highest after heat treatment at 1 000 ° C,and its microstructure was austenite strip ferrite +a small amount of M23C6. After heat treatment at 1 200 ℃,the microstructure of sample mainly consisted of austenite structure,a small amount of ferrite and M23C6. And the tensile strength came to the lowest.关键词：arc additive manufacturing;316L stainless steel;heat treatment;microstructure;mechanical properties
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发布时间：2022-03-15 - 摘要：The application of plasma-MIG hybrid welding technology in narrow groove welding is studied in this paper.Using numerical simulation technology, the combined heat source model of rotating body + double ellipsoid is applied to simulate the welding temperature field. The differences of weld shape and welding temperature field of welded joint between plasma-MIG hybrid welding and traditional MIG welding are analyze and compared. Experimental and numerical simulation results show that both the plasma-MIG hybrid welding and traditional MIG welding can provide wellformed joints. The plasma-MIG hybrid welding has smaller weld and heat affected zone area and higher welding efficiency than those of the traditional MIG welding. The numerical simulation is in good agreement with the experimental results. The combined heat source model can well reflect the heat input characteristics of plasma-MIG hybrid welding.关键词：plasma-MIG hybrid welding;narrow gap groove;heat source model;temperature field;numerical simulation
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发布时间：2022-03-15 - 摘要：In this paper,the influence of defocus on the process of laser cut-wire filler welding of thick plate 6005 A aluminum alloy was studied by observing and recording the molten pool fluctuation with a high-speed camera. The results show that when the defocus is zero,the spot is small,the energy density and the impact force are large,and the violently reactive liquid wire prevents the stable formation of keyhole in the weld pool,which makes the whole welding process unstable,accompanied by a lot of spatter and the appearance of periodic fine hole. Both positive defocusing and negative defocusing can increase the spot diameter and improve the stability of welding process,and the positive defocusing effect is better than negative defocusing,so it is better to use positive defocusing in laser wire filler welding. For aluminum alloy 6005A with a thickness of 16 mm,the welding speed is 6 mm/min,the defo-cusing capacity is +5 mm,and the laser power is 6 kW. The hardness value of the weld center of the welded joint is the lowest,which is 54 HV. Due to the large number of pores in the weld center,the tensile strength of the welded joint is 173.25 MPa.关键词：thick plate aluminum alloy;Laser cut-wire filling welding;defocusing amount;weld forming
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发布时间：2022-03-15 - 摘要：The weld,heat affected zone and microstructure and properties of P92 steel under different heat treatment were studied. The results show that the tensile fractures of all the specimens are located in the non-weld zone,and the tensile properties at the weld are better than those in the parent metal zone.After the sample being kept warm below 700 ℃ for 60 min,the hardness of the weld is higher than t hat of the parent metal,where the hardness of the weld is between 35～45 HRC and the hardness of the parent metal is around 20 HRC. This postweld heat treatment does not improve the hardness of the weld zone.After the postweld heat treatment with heat preservation at 760 ℃for 90 min,the weld microstructure is close to the original parent material micro-structure,which is tempered tortoise,the microstructure is uniform and small,the hardness of weld microstructure decreases and is close to that of the base metal,which is the best postweld heat treatment process in the test.关键词：P92 steel;postweld heat treatment;microstructure;property
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发布时间：2022-03-15 - 摘要：This paper studies the repair welding once in bond area influence the welding joint of Q345E steel of 4 mm single and 6 mm double pass. Based on mechanical properties test such as tensile,hardness,bending for repair welding joint; the metallographic structure before and after repair welding was analyzed;the metallographic structureof overlapping position of the original weld zone and repaired welding HAZ was analyzed.The metallographic structure of the heat-affected zone before and after repair welding was compared with that of the heat-affected zone after the first and second heat cycles respectively. It provides theoretical basis for further evaluation of joint performance.关键词：bond area repair welding;Q345E;single and double pass welding;mechanical properties;metallographic structure
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发布时间：2022-03-15 - 摘要：Reducing the square of lap joint by using lap welding of four-layer sheets achieves the lightweight of auto-body in foreignproduction cars. To get the technology,experimental study on spot welding joint of four-layer sheets of body-in-white in a domestic car design was done. The results show that the spot welding defects of four-layer sheets can be prevented and reduced effectively by optimizing welding process and improving assembly accuracy. The method can be applied appropriately when it meets the quality requirements of the company. For four-layer sheets with 0.7 mm thickness per sheet,under the spot welding parameters of preload electrode force of 2.0 kN, welding electrode force of 2.6 kN,welding time of 230 ms and welding current of 10 kA,the welded joints have good appearance and optimum mechanical properties. The results can provide technical guidance for later mass production.关键词：auto-body;lightweight;four-layer sheets;spot welding
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发布时间：2022-03-15 - 摘要：In view of the corrosion resistance requirements of our company’s research,design and manufacture of high-sulfur natural gas three-phase separator equipment for a gas field,it is necessary to surfacing Inconel 625 nickel-based alloy on the inner wall of the equipment shell,determine the process plan of using domestic nickel-based alloy electrode electroslag surfacing technology for the inner wall surfacing,and conduct the welding process evaluation.The evaluation results show that the surfacing welding process of domestic nickel-based alloy steel strip is good,and all the performance indexes meet the requirements of relevant standards and the manufacturing technology of three-phase separator,and the manufacture of the product has been completed.关键词：domestic nickel base alloy welding belt;electrode electroslag surfacing welding;three phase separator
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发布时间：2022-03-15 - 摘要：Using two welding processes,high-frequency pulse MAG welding and conventional pulse MAG welding,the welding process test was carried out on the 12 mm thick SMA490BW weather-resistant steel plate T-joint（fillet weld）,the macroscopic,penetration and the microstructure of the welded joint were analyzed,and the Vickers hardness HV10 and welding residual stress of the welded joint were also tested. The results show that comparing to the ordinary pulse MAG welding at the similar welding heat input value,the penetration of highfrequency pulse MAG welding increases by 20% ～30%,the residual stress at the HAZ（12 mm from weld toe） reduces by about 11%～26%,the high-frequency pulse MAG welded joint shows ideal microstructure characteristics,there is high content of acicular ferrite（AF） in weld,no ferrite side plate（FSP） and less content of grain boundary ferrite（GBF） in bond,and the grain coarseness of the grain coarsened zone（CGZ） is less. The vickers hardness HV10 value of the welded joint in two welding processes is less than 380 HV10,which meets the requirements of the welding procedure qualification standard.关键词：SMA490BW weather-resistant steel;high-frequency pulse MAG deep penetration welding;welding residual stress;microstructure;vickers hardness
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发布时间：2022-03-15 - 摘要：In order to avoid thermal cracks and porosity defects in the welding process of Incoloy 825 Ω ring,which is used for sealing design structure of heat exchanger,which will affect the sealing performance of heat exchanger,the horizontal fixed welding procedure qualification test of tube butt joint of Incoloy 825 was carried out by using tungsten argon arc welding. The rationality of the welding process is verified by macro inspection,non-destructive testing,mechanical test,bending test and intergranular corrosion test. The optimal welding process parameters are selected to guide the actual production operation,so as to ensure that the product quality meets the design and application requirements.
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发布时间：2022-03-15 - 摘要：Cobalt base alloy is the most widely used hardfacing alloy because of its good high temperature resistance,corrosion resistance and wear resistance. In order to reduce the maintenance cost of operating units in nuclear power plant and improve the maximum utilization rate of equipment,the research on cobalt based hardfacing technology of valve element ASTM 216 WCB steel was carried out in the way of "replacement replaced by repair". In this paper,the types of hardfacing and the mechanism of wear resistance of cobalt base alloy are introduced, and the cobalt base alloy hardfacing procedure qualification of ASTM 216 WCB steel is described in detail. Through the non-destructive testing and physical and chemical testing of the hardfacing layer,a satisfactory hardfacing joint is obtained,which provides a strong technical basis for the establishment of the process instruction of the same material valve core cobalt base hardfacing for the overhaul of the unit,so as to ensure the quality of the valve core repair cobalt base hardfacing meets the requirements.关键词：cobalt base alloy;wear resistance;hardfacing
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发布时间：2022-03-15 - 摘要：A CO2 gas shielded welding machine based on dsPIC30F4011 is designed. In order to reduce the loss of power switch tube and improve the electromagnetic inter-ference of welding machine, the main circuit adopts the phase-shifting full bridge soft switch circuit,which makes the super forearm realize ZVS with constant frequency and pulse width, and the lagging arm realize ZCS with constant frequency and width,which improves the overall performance of welding machine. The design of the main transformer is the key and difficult point. It is analyzed and designed from three aspects: the selection of magnetic core material,the selection of magnetic core model and the design of coil winding.dsPIC30F4011 is selected as the main control chip in the control circuit to monitor the working state of the welding machine in real time. According to the DSC hardware circuit,the corresponding software program is designed. The software program adopts modular design,including wave control software design,program control software design and wire feeding software design. Finally,the goal of small welding spatter,precise timing control and constant wire feeding is achieved.关键词：CO2 gas shielded welding machine;phase shifted full bridge soft switch;dsPIC30F4011;digital wire feeder
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发布时间：2022-03-15 - 摘要：Dual-power Plasma-MIG hybrid arc welding system was established based on PLC according to the process principles. The mode conversion method was proposed for the arc ignition under small parameters in the process of aluminum alloy welding. Plasma current Ip in welding circuit was detected as the stability criterion. The control system was integrated by programming HMI under MFC platform.Experimental results show that the dual-power Plasma-MIG control system can realize coordination control of two power source powers according to the Plasma-MIG welding sequence and achieve high quality welding for aluminum alloy.关键词：Plasma-MIG hybrid arc welding;welding system;arc ignition process
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发布时间：2022-03-15 - 摘要：Provide good practical operation platform for welding personnel,Combined with the actual needs of different sites to carry out the innovative design and production of welding station. This paper takes manual and semi-automatic melting welding station as the research object. According to the study,training and welding competition needs of welding training bases and training institutions in various colleges and universities. Choose light carbon steel material processing manufacturing welding station.Welding station can be flexibly assembled and dismantled according to different sites and requirements. Compared with the manufacturing and using effects of other stations,it is concluded that the free assembly welding station has obvious advantages in innovative design and manufacturing technology,and also has a broad application prospect.关键词：welding;location;partition;equipment storage;freedom of assembly
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发布时间：2022-03-15 - 摘要：Welding is the main processing method in manufacturing industry. The development of industrial manufacturing is advancing from manual welding to intelligent automation in an orderly way. In order to develop a modernized and high-quality staff,the enterprise encourages the staff to actively participate in the skill competition. In this paper,taking the welding assembly of Panasonic welding robot as an example,the structural characteristics of the specimen is analyzed. Based on the welding defects encountered by Panasonic welding robot in small components,such as edge bite,disconnection,lack of fusion,large size deviation of welding angle and overlap,the measures are formulated,including welding parameters,welding sequence,programming method and operation skill. By formulating and implementing the measures,it is guaranteed that the overall score results of appearance quality and internal quality inspection after welding can be above 85 points.关键词：welding robot;welding defect;programming
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发布时间：2022-03-15 - 摘要：Controlling the shape of the welding arc by applying a transverse magnetic field is an important research field of magnetron welding technology. In this paper,the transverse magnetic field is applied to change the arc energy distribution and arc shape change to explore the effect of the applied magnetic field on the arc shape and the excessive droplets. The results of the study show that,while maintaining the original bell-shaped shape of the MAG welding arc,the end dragged behind. At the same time,the addition of transverse magnetic field accelerates the excessive frequency of droplets and shortens the period of excessive droplets.Trailing after the end of the arc can effectively inhibit the liquid flow in the molten pool and improve the weld formation.关键词：transverse magnetron;MAG welding;high speed camera;arc shape
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发布时间：2022-03-15 - 摘要：In order to realize the localization of welding materials in the manufacturing and installation of nuclear power equipment,submerged arc welding wire and flux for hanging basket barrel are developed. By controlling the key elements C and N of 308L submerged arc welding wire,HS308LH welding wire and SJ601H welding flux conforming to nuclear power requirements are developed. The compo-sition,mechanical property,intergranular corrosion and meta-llographic structure of the developed wire and flux are tested.The results show that the wire and flux have the characteristics of good appearance of weld,easy slag removal and excellent welding process. And the mechanical properties,ferrite content and intergranular corrosion properties of the deposited metal all meet the technical requirements of third-generation nuclear power with a certain margin. Especially,the tensile property of deposited metal at 350 ℃ obviously improves with a large margin. The developed welding materials have passed the evaluation of major nuclear grade I equipment manufacturers in China.
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发布时间：2022-03-15 - 摘要：Combining test data and literature data,it is analyzed that four types of welding materials,385,316LMn,316L,and modified type 308L,can be used for welding of ultra-low temperature 304L austenitic stainless steel,and can meet the requirement of the impact energy of the weld metal at-196 ℃ ≥50 J. The welding process evaluation tests were carried out for 385,316LMn,modified type 308L electrodes and 316 L rod,each mechanical property met the requirements of the standard. Compared with the chemical composition and -196 ℃ impact test data of the weld,it was proved that with the increase of the content of ferrite in the weld,the impact value was obviously reduced,and the ultra-low temperature toughness of GTAW was better than SMAW. By controlling the number of ferrites of the four types of welding materials within 2 FN,the impact energy of the weld metal at -196 ° C can be greater than 50 J.
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发布时间：2022-03-15 - 摘要：An improved rigid fixed butt crack test method is used to analyze the influencing factors of cracks in the welding of ceramic cored wire with ceramic backing. Through analysis,it is found that the cracks are solidification cracks,and there are many factors that affect the generation of cracks. By designing the composition of the weld metal,the crack sensitivity can be predicted by using appropriate criteria. Welding current has an important effect on cracks. As the current increases,the crack sensitivity of the weld metal gradually increases. At the same time,the cracks is the result of the combined effect of metallurgical factors and process factors. The cracks can avoid by appropriate composition design and parameters.关键词：flux-cored wire;ceramic backing;solidification cracks;influence factors
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发布时间：2022-03-15 - 摘要：After years of development,China’s reforming reactor manufacturing technology has become increasingly mature,and the shell steel has been domestically produced,but the welding material of the shell is mainly imported and its localization does not synchronize with the localization of shell material. In this paper,the main shell of the 12Cr2Mo1R steel reforming reactor is welded with welding materials from Harbin Welding Research Institute. All performance can meet the national standards and equipment design requirements of the reforming reactor,which shows that the quality and stability of domestic welding materials reach the level of similar foreign products,and promotes the localization of heat-resistant steel welding materials,while using domestic welding materials can greatly reduce manufacturing costs.关键词：reforming reactor;12Cr2Mo1R;domestic welding materials;welding procedure
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发布时间：2022-03-15 - 摘要：The effect of welding current on the mechanical properties and microstructure of deposited metal of high-grade X80 high-efficiency gas shielded welding wire is studied,which provides a basis for automatic welding of pipeline engineering and welding process selection in alpine regions. The results show that under the welding current of 150～250 A,the deposited metal of X80 pipeline steel welding wire（1.0） has good strength and toughness;as the welding current increases,the impact toughness of the weld decreases. For every 10 A increase in welding current,the impact energy at -30 ℃ and -50 ℃ decrease 4 ～5 J,the microstructure of the weld is mainly composed of fine ferrite,which gives the material excellent toughness characteristics.关键词：welding current;X80 pipeline steel;deposited metal;properties
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发布时间：2022-03-15 - 摘要：<正>《电焊机》杂志是中国科技论文统计源期刊（中国科技核心期刊）、《中文核心期刊数据库》收录期刊"、英国《科学文摘》（INSPEC）来源期刊""俄罗斯《文摘杂志》收录期刊""美国《剑桥科学文摘》（CSA）收录期刊""波兰《哥白尼索引》（IC）"收录期刊等。各地邮局均可订阅,邮发代号:62-81,订价:15元/月,180元/年。
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发布时间：2022-03-15 -
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