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Study of gas shielding stability for underwater local dry welding based on FLUENT 被引量:1
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作者 高辉 焦向东 +1 位作者 周灿丰 朱加雷 《China Welding》 EI CAS 2010年第1期70-75,共6页
The research of gas shielding stability technology, playing a key role in underwater local dry welding, was introduced in this paper. The study includes shielding cup design, gas flow simulation, draining and welding ... The research of gas shielding stability technology, playing a key role in underwater local dry welding, was introduced in this paper. The study includes shielding cup design, gas flow simulation, draining and welding experiments. The commercial computational fluid dynamics ( CFD ) software FLUENT was applied to get and compare the speed and pressure contour images of gas in the three kinds of cup with different intake mode. The computed results show that the cup with stilling chamber on the top has the best shielding performance. The underwater welding experiment of 15 meters proves that the shielding cup with stilling chamber can offer a good dry space, the welding arc can burn stably in it and the weld quality is perfect. The research will facilitate the application of underwater local dry welding technology in the maintenance of nuclear power station widely. 展开更多
关键词 shielding cup gas shielding stability FLUENT underwater local dry welding
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Dissimilar welding of high nitrogen stainless steel and low alloy high strength steel under different shielding gas composition:Process,microstructure and mechanical properties
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作者 Zeng Liu Cheng-lei Fan +3 位作者 Chun-li Yang Zhu Ming San-bao Lin Lang-ping Wang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第9期138-153,共16页
Ar-N_(2)-O_(2)ternary shielding gas is employed in dissimilar welding between high nitrogen steel and low alloy steel.The effect of O_(2)and N_(2)is investigated based on the systematical analysis of the metal transfe... Ar-N_(2)-O_(2)ternary shielding gas is employed in dissimilar welding between high nitrogen steel and low alloy steel.The effect of O_(2)and N_(2)is investigated based on the systematical analysis of the metal transfer,nitrogen escape phenomenon,weld appearance,nondestructive detection,nitrogen content distribution,microstructure and mechanical properties.There are two nitrogen sources of the nitrogen in the weld:high nitrogen base material and shielding gas.The effect of shielding gas is mainly reflected in these two aspects.The change of the droplet transfer mode affects the fusion ratio,N2in the shielding gas can increase nitrogen content and promote the nitrogen uniform distribution.The addition of 2%O_(2)to Ar matrix can change the metal transfer from globular transfer to spray transfer,high nitrogen base material is thereby dissolved more to the molten pool,making nitrogen content increase,ferrite decrease and the mechanical properties improve.When applying N2-containing shielding gas,arc stability becomes poor and short-circuiting transfer frequency increases due to the nitrogen escape from droplets and the molten pool.Performance of the joints is improved with N_(2)increasing,but internal gas pores are easier to appear because of the poor capacity of low alloy steel to dissolve nitrogen,The generation of pores will greatly reduce the impact resistance.4-8%N2content in shielding gas is recommended in this study considering the integrated properties of the dissimilar welded joint. 展开更多
关键词 High nitrogen steel Dissimilar steel joints shielding gas Metal transfer MICROSTRUCTURE Mechanical properties
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Comparative Study on Processing Property Between CWW CO_2 Gas Shielded Welding and SAW 被引量:6
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作者 FANG Chen-fu HE Bin +3 位作者 ZHAO Zhong-chao HU Xiao-guang JIANG Jia-zhong SHI Zhen 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2013年第4期81-86,共6页
Cable welding wire(CWW)CO2gas shielded welding is an innovative process arc welding with high efficiency,high quality and low consumption,in which cable wire is used as consumable electrode.CWW CO2gas shielded weldi... Cable welding wire(CWW)CO2gas shielded welding is an innovative process arc welding with high efficiency,high quality and low consumption,in which cable wire is used as consumable electrode.CWW CO2gas shielded welding and submerged arc welding(SAW)are used for contrast studies on processing property of high strength steel A36used in ship structure.The results show that the shapes of weld seam,using CWW CO2gas shielded welding and SAW,are good and no weld defect such as air hole,flaw,slag inclusion,incomplete fusion,lack of penetration and so on are found in the weld seam.Because the rotating of arc during CWW CO2gas shielded welding process has a strong stirring effect on molten pool,the grain in the heat affected zone(HAZ)of the joints,using CWW CO2 gas shielded welding,is small.Tensile failure positions of joints by CWW CO2gas shielded welding and SAW are all in the base metal,but tensile strength of CWW CO2gas shielded welding joint is higher than that of SAW joint by an average of 2.3%.The average impact energy of HAZ,using CWW CO2gas shielded welding and SAW,is almost equal,but the average impact energy of the weld seam using CWW CO2gas shielded welding is increased by 6%,and the average impact energy of the fusion line is increased by 7%.The 180°bending tests for the joints of CWW CO2 gas shielded welding and SAW are all qualified,and the joints hardness is all less than HV 355,but hardness of CWW CO2gas shielded welding wire welding joint near the fusion line is obviously lower.It can be concluded that the properties of CWW CO2gas shielded welding are better than those of the SAW joint,and CWW CO2gas shielded welding is suitable for welding high strength steel A36used in ship structure. 展开更多
关键词 cable welding wire(CWW) gas shielded welding submerged arc welding(SAW) processing property
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Effect of shielding gas and defocusing on porosity during laser beam welding of 7A52 alloy 被引量:15
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作者 Wang lei Xu Xuezong +2 位作者 Wang Kehong Li He Huang Yong 《China Welding》 EI CAS 2020年第3期20-25,共6页
Laser beam welding is used to fabricate the 7A52 aluminum alloy plates.Effects of shielding gas and defocusing on porosities are investigated.Porosities are divided into hydrogen porosities and keyhole-induced porosit... Laser beam welding is used to fabricate the 7A52 aluminum alloy plates.Effects of shielding gas and defocusing on porosities are investigated.Porosities are divided into hydrogen porosities and keyhole-induced porosities.With the increasing flow rate of the front shielding gas,the porosity ratio firstly decreases,then increases.The porosity ratio is lowest under the flow rate of 25 L/min.When the flow rate is 30 L/min,the porosity ratio is higher because the large flow rate can affect the stability of the keyhole.The porosity ratio is also higher when the flow rate is less than 25 L/min because the protection is weakened.With the increase of the defocusing,the porosity ratio firstly decreases,then increases.When the defocusing is-2 mm,the porosity ratio is lowest.When the defocusing is more than 0 mm or less than-4 mm,the porosity ratio is higher due to the movement of the instable keyhole. 展开更多
关键词 laser beam welding POROSITY 7A52 shielding gas
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Gas metal arc welding of high nitrogen stainless steel with AreN_(2)-O_(2)ternary shielding gas 被引量:2
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作者 Zeng Liu Cheng-lei Fan +5 位作者 Zhu Ming Chao Chen Ang Liu Chun-li Yang San-bao Lin Lang-ping Wang 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第3期923-931,共9页
High nitrogen stainless steel with nitrogen content of 0.75%was welded by gas metal arc welding with Ar-N_(2)-O_(2)ternary shielding gas.The effect of the ternary shielding gas on the retention and improvement of nitr... High nitrogen stainless steel with nitrogen content of 0.75%was welded by gas metal arc welding with Ar-N_(2)-O_(2)ternary shielding gas.The effect of the ternary shielding gas on the retention and improvement of nitrogen content in the weld was identified.Surfacing test was conducted first to compare the ability of O_(2)and CO_(2)in prompting nitrogen dissolution.The nitrogen content of the surfacing metal with O_(2)is slightly higher than CO_(2).And then AreN_(2)-O_(2)shielding gas was applied to weld high nitrogen stainless steel.After using N_(2)-containing shielding gas,the nitrogen content of the weld was improved by 0.1 wt%.As N_(2)continued to increase,the increment of nitrogen content was not obvious,but the ferrite decreased from the top to the bottom.When the proportion of N_(2)reached 20%,a full austenitic weld was obtained and the tensile strength was improved by 8.7%.Combined with the results of surfacing test and welding test,it is concluded that the main effect of N_(2)is to inhibit the escape of nitrogen and suppress the nitrogen diffusion from bottom to the top in the molten pool. 展开更多
关键词 High nitrogen stainless steel AreN2-O2 shielding gas Action mechanism
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Influence of shielding gas on the mechanical and metallurgical properties of DP-GMA-welded 5083-H321 aluminum alloy 被引量:1
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作者 Amin Reza Koushki Massoud Goodarzi Moslem Paidar 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第12期1416-1426,共11页
In the present research, 6-mm-thick 5083-H321 aluminum alloy was joined by the double-pulsed gas metal arc welding (DP-GMAW) process. The objective was to investigate the influence of the shielding gas composition o... In the present research, 6-mm-thick 5083-H321 aluminum alloy was joined by the double-pulsed gas metal arc welding (DP-GMAW) process. The objective was to investigate the influence of the shielding gas composition on the microstructure and properties of GMA welds. A macrostructural study indicated that the addition of nitrogen and oxygen to the argon shielding gas resulted in better weld penetration. Furthermore, the tensile strength and bending strength of the welds were improved when oxygen and nitrogen (at concentrations as high as approximately 0. 1vol%) were added to the shielding gas; however, these properties were adversely affected when the oxygen and nitrogen contents were increased further. This behavior was attributed to the formation of excessive brown and black oxide films on the bead surface, the formation of intermetallic compounds in the weld metal, and the formation of thicker oxide layers on the bead surface with increasing nitrogen and oxygen contents in the argon-based shielding gas. Analysis by energy-dispersive X-ray spectroscopy revealed that most of these compounds are nitrides or oxides. 展开更多
关键词 aluminum alloys gas metal arc welding shielding gas mechanical properties metallurgical properties
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Improvement of the spreading effect of atmospheric pressure microplasma jet treatment through shielding-gas-controlled focusing
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作者 Li LV Jianhang CHEN +5 位作者 Jiahao WANG Shengquan WANG Meng LI Deyu TU Liping SHI Tao WANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第9期85-97,共13页
The spreading effect of atmospheric pressure microplasma jets(APμPJ)on the surface of materials will increase the etching area,and controlling the diameter of the jet can improve the precision of surface treatment.In... The spreading effect of atmospheric pressure microplasma jets(APμPJ)on the surface of materials will increase the etching area,and controlling the diameter of the jet can improve the precision of surface treatment.In this work,a two-dimensional axisymmetric simulation model is established to analyze the effect of nitrogen(N_(2))shielding gas on helium(He)from gas dynamics.In addition,by etching the polyethylene terephthalate fllm,the relationship between the etching effect and aerodynamic analysis is verifled.The simulation results are similar to the experimental results,indicating that N2 shielding gas has a focusing effect which is related to the N_(2)flow rate,distance difference between the inner and outer tubes,and outer tube nozzle diameter.It is hoped that the results of this work can provide a certain reference for the use of shielding gas to control the jet flow of APμPJ. 展开更多
关键词 microplasma jet nitrogen shielding gas focusing effect gas dynamic
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Influence of shielding gas on the transfer behavior of droplets
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作者 XIA Liqian 《Baosteel Technical Research》 CAS 2021年第4期37-40,共4页
High-speed photography is utilized to capture an image of the arc area during the welding process.The variation in arc shape and droplet transfer behavior is compared when employing shielding gases of different compon... High-speed photography is utilized to capture an image of the arc area during the welding process.The variation in arc shape and droplet transfer behavior is compared when employing shielding gases of different components and proportions(e.g.,80%Ar+20%CO_(2),85%Ar+10%CO_(2)+5%O2,65%Ar+26.5%He+8%CO_(2)+0.5%O2)using a Ф1.2 mm welding wire under 360 A current.Furthermore,the effects of various shielding gas components on the stability of the welding process are discussed.It was determined that the addition of oxygen and helium changed the arc’s shape and the behavior of the droplet transfer,and the welding process stability increased. 展开更多
关键词 GMAW shielding gas droplet transfer
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Study on the Effects of Helium-Argon Gas Mixture on the Laser Welding Performance of High Temperature Alloys
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作者 Xiongzi CHEN Hesi PENG +2 位作者 Chunchen YAO Yu DAI Yewen QIN 《Research and Application of Materials Science》 2023年第2期21-24,共4页
In order to solve the problem of porosity in laser deep penetration welding of GH3625 high-temperature alloy plates,five different ratios of high-purity helium gas and high-purity argon gas mixed gases were compared i... In order to solve the problem of porosity in laser deep penetration welding of GH3625 high-temperature alloy plates,five different ratios of high-purity helium gas and high-purity argon gas mixed gases were compared in welding experiments after various process parameter improvements and adjustments failed to achieve Class I welds.The experimental results show that using high-purity helium gas or a mixture of 50%high-purity helium gas and 50%high-purity argon gas can both achieve Class I welds.This indicates that using high-purity helium gas or an appropriate mixed gas instead of pure argon is one of the effective ways to solve the problem of porosity in laser deep penetration welding of high-temperature alloys.The mixture of 50%high-purity argon gas and 50%high-purity helium gas can reduce the consumption of high-purity helium gas,lower production costs,and is more suitable. 展开更多
关键词 high-temperature alloy laser welding pores shielding gas welding quality
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METAL INERT GAS WELDING OF 2519-T87 HIGH STRENGTH ALUMINUM ALLOY 被引量:1
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作者 XU Lianghong TIAN Zhiling +1 位作者 ZHANG Xiaomu PENG Yun 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2007年第4期32-35,共4页
20 mm thick plates of 2519-T87 high strength aluminum alloy have been welded.The effects of the compositions of filler wires,the heat input and the compositions of shielding gas on the mechanical properties and micros... 20 mm thick plates of 2519-T87 high strength aluminum alloy have been welded.The effects of the compositions of filler wires,the heat input and the compositions of shielding gas on the mechanical properties and microstructure of the welded joint have been investigated.The results indicate that finer microstructure,better mechanical properties and higher value of hardness of HAZ can be obtained by using lower heat input.The use of Ar/He mixed shielding gas has several advantages over pure Ar shielding gas.With the increase of the proportion of He in the mixed shielding gas, the grain size of the weld metal as well as porosity susceptibility decreases.When the volume ratio of He to Ar reaches 7:3,the porosity and the grain size of weld metal reach the minimum,and the porosity can be further reduced by filling some CO2. 展开更多
关键词 High strength aluminum alloy WIRE Heat input shielding gas
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Effect of Welding Parameters on GTA Weld Shape for Pure Iron Plate under Ar-O_2 Mixed Shielding
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作者 ShanDing LU H.Fujii K.Nogi 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2006年第3期359-366,共8页
Weld shape variation for different welding parameters is investigated on pure iron plate under gas tungsten arc (GTA) welding with argon-oxygen mixed shielding. Results showed that small addition of oxygen to the ar... Weld shape variation for different welding parameters is investigated on pure iron plate under gas tungsten arc (GTA) welding with argon-oxygen mixed shielding. Results showed that small addition of oxygen to the argon base shielding gas can effectively adjust the oxygen adsorption to the molten pool. An inward Marangoni convection occurs on the pool surface when the oxygen content in the weld pool is over the critical value, 80×10^-6, for pure iron plate under Ar-0.3%O2 mixed shielding. Low oxygen content in the weld pool changes the inward Marangoni to an outward direction under the Ar-0.1%O2 shielding. The GTA weld shape depends to a large extent on the pattern and strength of the Marangoni convection on the pool surface, which is determined by the content of surface active element, oxygen, in the weld pool and the welding parameters. The strength of the Marangoni convection on the liquid pool is a product of the temperature coefficient of the surface tension (dσ/dT) and the temperature gradient (dT/dr) on the pool surface. Different welding parameters will change the temperature distribution and gradient on the pool surface, and therefore, affect the strength of Marangoni convection and the weld shape. 展开更多
关键词 Weld shape OXYGEN Marangoni convection Mixed shielding gas
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Gas dynamic control of properties of welded joints from high strength alloyed steels
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作者 D. A. Chinakhov 《China Welding》 EI CAS 2014年第3期26-30,共5页
Gas dynamic control in welding with consumable electrode in conditions of two-jet gas shielding and its impact on the processes in the welding area and properties of the welded joints from high strength alloyed steel ... Gas dynamic control in welding with consumable electrode in conditions of two-jet gas shielding and its impact on the processes in the welding area and properties of the welded joints from high strength alloyed steel 30HGSA is considered in the paper. The results of a comparative experimental study of controlling the properties of welded joints by changing the gas dynamics of the active shielding gas are given. The impact force of a shielding gas jet on the drop of the electrode metal is 12 times higher in conditions of two-jet gas shielding than in those of single jet shielding. It is found that gas dynamics of the active shielding gas jet determines the formation of the welded joints, their chemical properties and the properties of the welded joints from high strength alloyed steels. The consumable electrode welding method with two-jet gas shielding provides controlled dynamics in the welding area and allows controlling the transfer of the electrode metal, chemical composition of the weld, stabilizing the welding process, it ensures higher mechanical properties of the welded joints. 展开更多
关键词 WELDING gas dynamic control shielding gas properties welded joint alloyed steel
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Effect of Tempering Temperature on Strength and Toughness of Novel Carbide-Free Bainite/Martensite Duplex Phase Steel 被引量:7
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作者 LIU Dong-yu BAI Bing-zhe +3 位作者 FANG Hong-sheng YANG Zhi-gang ZHANG Chi YAN Wen-yan 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2002年第1期46-49,共4页
The microstructure in the weld metals for HQ130+QJ63 high strength steels, which are welded by Ar CO 2 gas shielded metal arc welding, was analyzed by means of microscope and scan electron microscope (SEM). The rela... The microstructure in the weld metals for HQ130+QJ63 high strength steels, which are welded by Ar CO 2 gas shielded metal arc welding, was analyzed by means of microscope and scan electron microscope (SEM). The relative content of different microstructure was evaluated with XQF 2000 micro image analyzer. The effect of acicular ferrite content on the impact toughness was also studied. The test results indicated that the main microstructure in the weld metals of HQ130+QJ63 high strength steels is acicular ferrite and a few pro eutectic ferrite on the boundary of original austenite grain. Near the fusion zone there are columnar grains whose direction coefficient (X) is 3 22, but the microstructure in the center of the weld metal is isometric grain, whose direction coefficient X=1 In order to avoid welding crack and improve welding technology the weld heat input should be strictly controlled in 10-16 kJ/cm. Thus, the main microstructure in the weld metals is fine acicular ferrite and the content of pro eutectic ferrite is limited. The impact toughness in the weld metals of HQ130+QJ63 steels can be ensured and can meet the requirements for application in engineering and machinery. 展开更多
关键词 high strength steel gas shielded metal arc welding weld metal micro image
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Numerical simulation of DE- GMAW of magnesium alloy cylinder 被引量:2
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作者 Fang Naiwen Wang Liping +4 位作者 Li Liansheng Zhang Haibo Zhang Yingehun Ma Qing Jun Song Nan 《China Welding》 EI CAS 2018年第2期24-30,共7页
Double-electrode gas shielded arc welding ( DE - GMAW) was used to weld the magnesium alloy cylinder with the diameter of 200 mm and the thickness of 6 mm. In order to study the residual stress distribution of AZ31B... Double-electrode gas shielded arc welding ( DE - GMAW) was used to weld the magnesium alloy cylinder with the diameter of 200 mm and the thickness of 6 mm. In order to study the residual stress distribution of AZ31B magnesiunl alloy welding point, numerical sinmlation of welding temperature field, stress field and residual stress were carried out by MSC. mare software. The results show that the residual stress in the weld and the heat affected zone is large, and with the increase of the distance away from the weld center, the residual stress decreases. In most areas, the longitudinal residual stress is greater than the transverse residual stress (except for the inside and outside surfaces of the weld) , all of which provides theoretical support for the study of magnesiunl alloy welding residual stress. 展开更多
关键词 AZ31B magnesiunl double-electrode gas shielded arc welding stress and strain field numerical sinmlation
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Analysis Microstructure of Weld Metal for HQ130+QJ63 High Strength Steel
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作者 WANG Juan LI Ya-jiang SUN Jun-sheng 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2002年第1期50-54,共5页
The microstructure in the weld metals for HQ130 + QJ63 high strength steels,which are welded by Ar-CO_2 gas shielded metal arc welding,was analyzed by means of microscope and scan electron microscope(SEM).The relative... The microstructure in the weld metals for HQ130 + QJ63 high strength steels,which are welded by Ar-CO_2 gas shielded metal arc welding,was analyzed by means of microscope and scan electron microscope(SEM).The relative content of different microstructure was evaluated with XQF-2000 micro-image analyzer.The effect of acicular ferrite content on the impact toughness was also studied.The test results indicated that the main microstructure in the weld metals of HQ130 + QJ63 high strength steels is acicular ferrite and a few pro-eutectic ferrite on the boundary of original austenite grain.Near the fusion zone there are columnar grains whose direction coefficient(X) is 3.22,but the microstructure in the center of the weld metal is isometric grain,whose direction coefficient X = 1.In order to avoid welding crack and improve welding technology the weld heat input should be strictly controlled in 10-16 kJ/cm.Thus,the main microstructure in the weld metals is fine acicular ferrite and the content of pro-eutectic ferrite is limited.The impact toughness in the weld metals of HQ130+ QJ63 steels can be ensured and can meet the requirements for application in engineering and machinery. 展开更多
关键词 high strength steel gas shielded metal arc welding weld metal micro-image
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Study of welding technology on Baosteel high-strength heavy steel Bweldy620QL6 被引量:3
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作者 QU Zhaoxia XIA Liqian ZHU Shuangchun 《Baosteel Technical Research》 CAS 2018年第2期3-7,共5页
This study aims to conduct the weldability test for a high-strength structural steel, Bweldy620QL6, developed by Baosteel. This steel was subjected to welding,and the effects of two kinds of shielding gas,a binary gas... This study aims to conduct the weldability test for a high-strength structural steel, Bweldy620QL6, developed by Baosteel. This steel was subjected to welding,and the effects of two kinds of shielding gas,a binary gas of 80% Ar + 20% CO, and ternary gas of 90% Ar + 8% CO, + 2% O2, on the performance of the welded joints of high-strength heavy steel were compared. The results show that Bweldy620QL6 has good weldability,and the joints obtained using binary gas and ternary gas meet common requirements. 展开更多
关键词 high-strength heavy steel shielding gas MAG welded joint weld toughness
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Microstructure and Mechanical Properties of AlSi10Mg Alloy Manufactured by Laser Powder Bed Fusion Under Nitrogen and Argon Atmosphere 被引量:5
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作者 Yunmian Xiao Yongqiang Yang +3 位作者 Shibiao Wu Jie Chen Di Wang Changhui Song 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2022年第3期486-500,共15页
In order to study the effect of gas atmosphere on forming performance of laser powder bed fusion(LPBF),AlSi10 Mg alloy was prepared by direct forming and in situ laser remelting under the shielding gas of argon and ni... In order to study the effect of gas atmosphere on forming performance of laser powder bed fusion(LPBF),AlSi10 Mg alloy was prepared by direct forming and in situ laser remelting under the shielding gas of argon and nitrogen in this study,and its micro structure and properties were characterized and tested,respectively.The results show that the forming performance of AlSi10 Mg under nitrogen atmosphere is better than that of argon.Moreover,in situ laser remelting method can effectively enhance the relative density and mechanical properties of AlSi10 Mg,in which the densification is increased to 99.5%.In terms of mechanical properties,after in situ remelting,ultimate tensile strength under argon protection increased from444.85±8.73 to 489.45±3.20 MPa,and that under nitrogen protection increased from 459.21±13.77 to 500.14±5.15 MPa.In addition,the elongation is nearly doubled and the micro-Vickers hardness is increased by 20%.The research results provide a new regulation control method for the customization of AlSi10 Mg properties fabricated by LPBF. 展开更多
关键词 In situ laser remelting Laser powder bed fusion AlSi10Mg alloy Mechanical properties shielding gas
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Effects of Welding Procedure on Corrosion Resistance and Hydrogen Embrittlement of Supermartensitic Stainless Steel Deposits
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作者 Zappa Sebastián Surian Estela Svoboda Hernán 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2013年第12期124-132,共9页
The effects of shielding gas and post weld heat treatment on the pitting resistance, stress corrosion crack- ing and hydrogen embrittlement of supermartensitic stainless steel deposits were studied. Two all-weld-metal... The effects of shielding gas and post weld heat treatment on the pitting resistance, stress corrosion crack- ing and hydrogen embrittlement of supermartensitic stainless steel deposits were studied. Two all-weld-metal test coupons were prepared using a metal-cored wire under Ar+ 5% He and Ar+18%CO2 gas shielding mixtures. Solubi- lizing and solubilizing plus double tempering heat treatments were done with the objective of achieving different mi crostructural results, The samples welded under Ar+5% He showed higher pitting corrosion resistance, for all post weld heat treatments, than those welded under Ar+18% CO2. The different post weld heat treatments generated higher susceptibility to this corrosion mechanism. None of the samples presented signs of stress corrosion cracking, but in those subjected to the heat treatment, grain boundary selective attack was observed, on the surfaces of all the samples studied. The samples with highest hardness were more susceptible to hydrogen damage, thereby leading to reduced tensile strength on this condition. 展开更多
关键词 supermartensitic stainless steel shielding gas post weld heat treatment CORROSION hydrogen embrittle ment
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