MAIN TOPICS，ABSTRACTS ＆ KEY WORDS

MAIN TOPICS，ABSTRACTS ＆ KEY WORDS

Abstract During the repairing process of S31803 duplex stainless steel，the zones of original weld which near to the repaired weld was reheated again．And the ferrite phase in this zone has a further transformation to austenite phase，which leads to the decrease of the ferrite phase proportion and can not even meet the standard requirements．Through a series of tests and analyses，some control measures of phase proportion in this zone were made，which can play a guiding role in welding procedure qualification tests and welding production of S31803 duplex stainless steel．

Key words: duplex stainless steel，phase proportion，repair

编辑 刘 永

Bionic design of overlying structure of plough share and its wear resistance

Li Muqin，Cai Dingsen，Zhuang Minghui，Yang Hai，Peng Shuhao，Wang Junfa
(State Key Lab of Modern Welding Production and Technology，Jiamusi University，Jiamusi 154007，Heilongjiang，China)．p1 －6

In order to improve the working life of plough share and get a overlying micro-structure like dung beetle，Design a metal powder cored wire of Fe-Cr-C-(B4C)xwas designed，which that can control the variation of microstructure from overlying to dung beetle by adjusting addition of B4C．The characteristics of microstructure of the deposited layer prepared by CO2gas shielded welding were studied though scanning electron microscopy and EBDS，and the hardness and the abrasive wear resistance were measured．It is found that the microstructures of the deposited layer are martensite，lower bainite，net-like(Cr，Fe)3(B，C)and a little of TiC．The microstructure is similar to that of dung beetle and the abrasive wear resistance is 3 ～4 times than that of 65Mn steel．

metal powder cored wire， bionic overlying， wear resistance

Microstructure and mechanical properties of deposited metal made by BHG-5 filler wire

Zhang Xianhui，Jia Jun
(MCC Baosteel Technology Services Co．，Ltd，Shanghai 201999，China)．p7 －9

Abstract BHG －5 welding wire is a GMAW filler wire which is widely used in domestic market，and its deposited metal possesses excellent mechanical properties when welding with shielding gas of 80%Ar+20%CO2．The mechanical properties and microstructure of BHG －5’s deposited metal were test and analyzed in this paper，the relativity between microstructure and mechanical properties and toughening mechanism were discussed．

Key words: yield strength 890 MPa high strength steel， deposited metal， microstructure， mechanical properties

Effect of removing weld reinforcement on residual stress in TIG welded joint of aluminum alloy

Shi Kangning1，Wang Dianlong1，Liang Zhimin1，Han Shanguo2
(1．School of Material Science and Technology，Hebei University of Science and Technology，Shijiazhuang 050018，Hebei，China;2．Guangdong Welding Institute(China-Ukraine E．O．Paton Institute of Welding)，Guangzhou 510560，China)．p10－13

Abstract The distributions of longitudinal and transverse residual stress in of 3 mm-thick and 5 mm-thick marine 5 series aluminum alloy welded joints with and without reinforcement were measured by ultrasonic method，the joints were prepared by TIG welding with filler wire．Compared with 5 mm-thick plate，the results show that longitudinal residual stress in 3 mm-thick plate near weld zone was slightly lower because the large deformation can release part of the stress before removing the weld reinforcement．The longitudinal tensile stress is the highest near weld zone，and there is a compressive stress zone on both sides of the test plate．After removing the weld reinforcement，the double-peak feature of the longitudinal residual stress distribution with maximum stress near the weld zone．The removal of the weld reinforcement has few effects on the release of the longitudinal residual stress，but the transverse residual stress can be appropriately reduced．

Key words: welding residual stress， ultrasonic method， aluminum alloy， argon tungsten arc welding

Effect of cryogenic environment on the low cycle fatigue properties of 9%Ni steel made by SMAW

Zhao Yongzhen1，Li Fang1，2，Cai Yan1，2，Hua Xueming1，2
(1．Shanghai Jiaotong University，Shanghai Key Laboratory of Material Laser Processing and Modification，Shanghai 200240，China;2．Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration，Shanghai 200240，China)．p14 －17，21

Abstract In this paper，low cycle fatigue property of 9%Ni steel joint by shielded metal arc welding was tested，and the strain-cycle curve at room temperature was drew．Low cycle fatigue cycle of high strain amplitude(0．6%)at low temperature(－180℃)was tested．fractures at different test temperatures were inspected，and the influence of low temperature environment on crack initiation and crack propagation process were analyzed．The conclusion is that cyclic hardening effect occurs in 9%Ni steel joint performances at low temperature environment under the effect of high strain amplitude loop，while cyclic softening effect appears at room temperature．It shows that low temperature environment helps to slow down the process of 9%Ni steel joint crack initiation and increase crack extension rate．

Key words: 9%Ni steel， SMAW joint， low cycle fatigue， low temperature

Review of precious metal alloys for jewelry and relevant brazing technology

Zhao Chenfeng，Zhao Jianchang，Zhang Qingke，Yu Qi，Xue Hongyu
(State Key Laboratory of Advanced Brazing Filler Metals＆ Technology，Zhengzhou Research Institute of Mechanical Engineering，Zhengzhou 450001，China)．p18－21

Abstract The topic covers the gold and silver alloys and the brazing technology for precious metal jewelry．Categories，characteristics and applications of gold and silver alloys for jewelry were listed along with the specific brazing filler metal and brazing technology for every type．According to the national standards，48 brands of brazing filler metals for silver alloys(including palladium alloys)and 19 brands of gold alloys were used within varieties of industries，but none for jewelry industry．Along with the growing of market demand for precious metal alloys，material safety standards for brazing filler metals specifically for jewelry are in request．It is certain that nontoxic，series of standardized jewelry industrial brazing filler metals as well as relevant national standards will soon walk on to stage．

Key words: precious metal alloys， gold alloys， silver alloys， brazing

Research status and development trend of magnesium alloy welding technology

Fang Naiwen1，Wang Liping1，Li Liansheng2，Lin Xiaohui2
(1．Harbin University of Science and Technology，Harbin 150040，China;2．Harbin Welding Institute，China Academy of Machinery Science and Technology，Harbin 150028，China)．p22 －26

Abstract The characteristics and application of magnesium alloys were introduced，the current problems in magnesium alloy welding were analyzed，and welding methods of magnesium alloy were introduced in detail，which includes gas tungsten arc welding，friction stir welding，electron beam welding，resistance spot-welding，laser-arc hybrid welding，gas metal arc welding，brazing．At last，the research and application of magnesium alloys welding was forecasted．

Key words: magnesium alloy welding， characteristics， welding method

TKY node welding of fixed platform with jacket in offshore oil engineering

Sun Zhiguang
(Offshore Oil Engineering Co．，Ltd，Tianjin 300461，China)．p27 －31

Abstract As the supporting structure，the jacket is a part of the fixed platform in offshore oil engineering．It’s a spatial truss structure that made up of intersecting multi-pipe with welding，and the TKY node is the main welding structure，its welding quality directly decides the security and practicability of the platform．In this paper，By taking a platform in the East China Sea as the instance，the TKY node welding of fixed platform with jacket in offshore oil engineering was discussed from the welding process，welder qualification requirement，the preparation of TKY node，the welding quality control and the welding repairing for crack．

Key words: offshore oil engineering， fixed platform， jacket， TKY node

Researches of CHM－Al 4047 and high-silicon eutectic aluminum alloy welding wire

Xu Xiaolong1，Hu Xuefeng1，Li Yunfeng1，Ming Tingze1，Jiang Yong1，Zhu Yanli2，Hu Guangzhong2
(1．Sichuan Atlantic Welding Consumables Co．，Ltd，Zigong 643010，Sichuan，China;2．Sichuan University of Science and Engineering，Zigong 643000，Sichuan，China)．p31 －33

Abstract CHM － Al 4047 high-silicon eutectic aluminum alloy welding wire was prepared by“continuous casting and rolling+shaving”．6061 － T6 aluminum alloy plates were used as base metal，and the compactness，mechanical properties and microstructures of the joint were analyzed．The results showed that，the radiographic inspection results can reach gradeⅠ，the tensile strength is 201 MPa，the joint coefficient is 0．69，and bending property is excellent．The microstructure of weld metal is composed of acicular eutectic silicon，fine grained eutectic silicon and α(Al)．steady β phase clusters form by aggregation growth of Mg2Si phase in HAZ，which results in softening and fracture in HAZ．

Key words: continuous casting and rolling， CHM －Al 4047 aluminum alloy welding wire， welded joint， mechanical properties，microstructure

Microstructure and creep property of friction welding in 2205 duplex stainless steel

Yang Feng，Shi Duanhu，Zhou Xinsheng
(Jiangsu Key Laboratory of Large Engineering Equipment Detection and Control，Xuzhou Institute of Technology，Xuzhou 221018，Jiangsu，China)．p34 －37

Abstract 2205 duplex stainless steel was welded by continuous drive-rotation friction welding．The microstructure evolutions and the distribution of phase in each joint were observed by optical microscope．Nano-indentation technology was used to evaluate the creep properties of the γ and δ phase．The results show that joint zones，including base metal，welded zone and plastic deformation zone，and nano-hardness in the γ phase markedly increases due to the plastical deformation，and the increment rate is faster than that in the δ phase zone．Creep properties of γ and δ phase are described in creep stress exponent n based on，creep stress exponent decreases with rising nano-hardness of γ and δ phase．

Key words: 2205 duplex stainless steel， friction welding， nano-indentation， creep

Dissimilar metals welding technology between GH4169 and nickel electroforming

Kong Zhaocai，Wang He，Zou Hefei，Ma Licui，Zhang Longfei，Gao Fenglin，Xu Songjuan
(The Capital Aerospace Machinery Company，Beijing 100076，China)．p37 －39

Abstract For the difficulty in welding of GH4169 to electroforming nickel，the states of electroforming nickel，welding wire and welding parameters were studied．Based on macroscopic features inspection，mechanical properties test and microstructures analysis，the optimized parameters for formal products and detection methods were determined．Finally，the trial run and flight check are succeeded．

Key words: high temperature alloy， electroforming nickel， dissimilar metal， welding

Shear mechanical property and microstructure of spot welded joint of a new dual-phase high strength steel

He Youyou1，2，Liu Weijie1
(1．Northeastern University Research Institute，Shenyang 110819，China;2．School of Chemical Engineering，Shenyang University of Technology，Shenyang 110870，China)．p40 －43

Abstract The effect of various factors on the resistance spot welding quality of a new dual-phase high strength steel was analyzed by orthogonal test and shear test．The microstructure and mechanical properties of the spot welded joints were investigated by metallographic microstructure test．The failure mode and the metallographic microstructures of the joints were analyzed．The results show that the maximum shear stress of the spot welded joint reaches the maximum at the welding current of 8 kA，the welding time of 15 cyc and the electrode force of 2 kN．In the tensile test of high-quality welded joints，the crack initiates from the nugget near the border，then spreads to the base metal，until the spot welded joints fractures．

Key words: high strength steel， resistance spot welding， orthogonal test， mechanical property

Analysis and treatment of effect of cladding layer defects on seal welding quality of tube plate in 1 000 MW steam generator

Wu Yidang，Yang Zhipeng，Zhang Bin，Liu Mingyu
(China Nuclear Power Engineering Co．，Ltd，Shenzhen 518124，Guangdong，China)．p44 －46

Abstract The formation causes of the cladding layer defects in tube plate of the 1 000 MW steam generator were introduced．Based on the cladding layer quality problems occurred in a certain factory，the effect on the seal welding quality of tube to tube plate was analyzed．And the measures were proposed to treat the quality problems，which provide the reference for the treatment of the similar quality problems and improvement of quality in the nickel base alloy cladding layer of tube plate in the future．

Key words: steam generator， defects in cladding layer， tube to tube plate welding

Overlaying process and corrosion test of UNS N06625 in anti-sulfur high pressure separator

Han Bing1，Feng Wei2，Wei Tao2
(1．Chemical Machinery Works，Sinopec Nanjing Chemical Industries Co．，Ltd，Nanjing 210048，China;2．Harbin Welding Institute，China Academy of Machinery Science and Technology，Harbin 150028，China)．p47－50

Abstract The product characteristics of gas field with rich H2S and CO2natural gas were analyzed，the structure of low alloyed steel overlaid by alloy 625 for well separator was determined and the proper welding process was selected．The weldability of alloy 625 was analyzed，and the proper welding process parameters were found out based on the process experience．Three overlaying procedures of one layer electroslag welding，shielded metal arc welding and automatic argon welding inside of small diameter pipe were qualified．Besides，the evaluation tests for intergranular corrosion，magnesium chloride stress corrosion and H2S stress corrosion resistance and dynamic corrosion under simulated working condition were carried out．The results are acceptable and meet the technical requirements．The equipment fabrication was completed．

Key words: Ni-base alloy， overlay welding， procedure qualification， corrosion test

Temperature field calculation and test for laser welding of aluminium alloys

Li Jianlong，Zhong Ensong
(Zhengzhou Railway Vovational＆ Technical College，Zhengzhou 451460，China)．p51－53

Abstract For the laser welding of aluminium alloys，according to the model of the two-dimensional transient temperature field，analytical equation was obtained to calculate the temperature gradient．The orthogonal optimization experiment was designed under the laser power，defocusing distance and the welding speed，and the optimum process parameters were obtained．Using the formula of the Matlab，the temperature gradient curve was calculated．The transient temperature decrease as the distance is far from the weld．The temperature near the welds was tested by using the thermal test paper，the test result was in accordance with the calculated result．

Key words: laser welding， temperature field calculation， temperature test

Influence of heat-treatment on microstructure and properties of 316L stainless steel woven meshes

Hou Liqiang，Meng Wenyan，Lu Wenjing，Zhang Xiaoqing，Bai Wenfeng，Xu Peimin
(Xi’an Filter Metal Materials Co．Ltd，Xi’an 710201，China)．p54 －57

Abstract 316L stainless steel woven meshes were annealed at 1 080℃ and 1 350℃，and the microstructures，mechanical properties and fracture modes were studied compared with that of 316L stainless steel woven meshes without heat treatment．The results show that the grain size becomes larger obviously after annealing treatment，fusion welding phenomenon occurs at contact points of the wires，the yield and tensile strength decreases greatly while the ductility increases，and the macroscopic fracture mode changes from normal to shear fracture．

Key words: heat treatment， stainless steel woven meshes， property

Design of automatic feeding mechanism for terminals

Zhao Mingxia，Gao Chunfang
(Baoji Vocational Technology College，Baoji 721013，Shaanxi，China)．p57 －59

Abstract The automatic feeding mechanism was designed for the terminals of the electromotor shell welding．The mechanism consists of rubbing mechanism，pushing equipment，overturning assembly and the spline shafts．The rubbing mechanism uses vibration feeding channel to transport the terminals，then through the separating plate to complete the sorting．The pushing equipment pushes the terminal to the next mechanism．The overturning assembly and the spline shafts are used to positioning in horizontal position and angle position to meet the requirements of the position of the welding．

Key words: terminals， feeding mechanism， sorting， positioning

Precision pulsed repair-welding of K4169 alloy casing

Zhou Guannan，Qu Shen，Li Ying，Song Wenqing，Yang Shuo，Li Xiaoguang
(AECC Shenyang Liming Aero-engine Co．，Ltd，Technical Center，Shenyang 110043，China)．p60 －63

Abstract Due to the characteristics of precision pulsed arc welding，such as compatibility，flexibility and the precise control of heat input，the welding experiments were carried out on K4169 alloy sheet with 0．2 mm in thickness．The results show that the microstructure is dendritic morphology with uniform and tiny strengthening precipitation．Furthermore，the welding defect is not free by X-ray inspection．Tensile properties of the joints at room temperature and 650 ℃ are equal to that of the base metal，but show lower hardness．The crack was repaired by precision pulsed arc welding and the result was qualified by the product quality inspection institutions．The conclusion proved precision pulsed arc welding can be applied to the crack repairing of casing．

Key words: precision pulsed arc welding， repair technology， K4169 alloy

Control methods of S31803 duplex stainless steel weld phase proportional which affected by repair welding

Wang Xinbao，Zhou Bin，Guo Wang，Liu Jingang
(Zhuhai Jutal Offshore Oil Services Co．，Ltd，Zhuhai 519050，Guangdong，China)．p64 －67