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S355J2W钢高频脉冲MAG焊T-HV焊缝的组织和性能
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作者 田海超 丁成钢 《焊接技术》 2023年第4期36-39,共4页
文中选用直径分别为1.2 mm和1.6 mm的焊丝,对S355J2W耐候钢进行高频脉冲MAG焊工艺试验,接头为T形接头,通过对焊接接头宏观形貌观察和微观组织分析,2种工况焊缝成形均良好,实现了单面焊双面成形,且在较小热输入的条件下采用直径1.6 mm焊... 文中选用直径分别为1.2 mm和1.6 mm的焊丝,对S355J2W耐候钢进行高频脉冲MAG焊工艺试验,接头为T形接头,通过对焊接接头宏观形貌观察和微观组织分析,2种工况焊缝成形均良好,实现了单面焊双面成形,且在较小热输入的条件下采用直径1.6 mm焊丝打底也可防止产生根部未熔合、未焊透缺陷,避免了气孔、夹杂及裂纹的产生。接头显微组织特征类似,焊缝为较多的先共析铁素体(GBF)、针状铁素体(AF)和少量珠光体(P)及粒状贝氏体(BG)组织,未见向晶界内生长的塑性较差的侧板条铁素体(FSP);熔合区主要为一定量的先共析铁素体(GBF)、针状铁素体(AF)组织,少量的珠光体(P)、粒状贝氏体(BG)组织,靠近焊缝侧晶粒较细小,靠近过热区侧晶粒较粗大;过热区主要是较多的细条状铁素体(IGF)、粒状贝氏体(BG)和少量珠光体(P)组织,晶粒大小比较均匀。采用Image-Pro Plus软件测量和计算了焊缝中针状铁素体占比,与直径1.2 mm焊丝相比,采用直径1.6 mm焊丝的焊缝中针状铁素体增加了10%。硬度测试结果表明:2种工况焊接接头的硬度值均在母材处出现最小值,在过热区出现最大值,且硬度值均小于标准规定的HV10380。 展开更多
关键词 s355j2W耐候钢 高频脉冲MAG焊 T-HV接头 实心焊丝 组织和性能
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S355J2W+N钢不同直径焊丝的高频脉冲MAG对接焊工艺
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作者 荣豪 张志毅 +2 位作者 刘念祖 田海超 丁成钢 《焊接技术》 2023年第5期96-98,共3页
文中采用φ1.2 mm和φ1.6 mm焊丝对S355J2W+N耐候钢进行高频脉冲MAG对接焊工艺试验,坡口角度为40°,使用直径1.2 mm焊丝的焊接参数为:打底焊接电流236 A,电弧电压29 V;盖面焊接电流242 A,电弧电压30.1 V,摆动角度3°,摆动速度8... 文中采用φ1.2 mm和φ1.6 mm焊丝对S355J2W+N耐候钢进行高频脉冲MAG对接焊工艺试验,坡口角度为40°,使用直径1.2 mm焊丝的焊接参数为:打底焊接电流236 A,电弧电压29 V;盖面焊接电流242 A,电弧电压30.1 V,摆动角度3°,摆动速度8周/min,摆动的左右停留时间为0.3 s;使用直径1.6 mm焊丝的焊接参数为:打底焊接电流210 A,电弧电压26.5 V;盖面焊接电流249 A,电弧电压27.5 V。对焊接接头进行宏观形貌观察和分析,结果显示:焊缝成形均良好,实现了单面焊双面成形,无气孔、夹渣、裂纹等焊接缺陷,外观符合EN ISO17637∶2016/EN ISO 5817∶2014 B级质量要求。但G40X焊缝呈蘑菇状,G40Y焊缝近似三角形状,且G40Y焊缝成形系数、余高系数及焊趾角度均大于G40X的,与φ1.2 mm焊丝相比,使用φ1.6 mm焊丝可使根部熔深提高50%。 展开更多
关键词 s355j2W%PLUs%N耐候钢 高频脉冲MAG焊 对接接头 φ1.6 mm实心焊丝 焊接工艺
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S355J2W耐候钢高频脉冲MAG焊对接接头的组织和性能
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作者 付浩 陈晓佳 +1 位作者 李怀舟 丁成钢 《焊接技术》 2023年第2期29-32,共4页
文中选用φ(Ar)80%+φ(CO_(2))20%(M21型)的保护气体,对板厚为12 mm的地铁转向架构架用S355J2W耐候钢进行了3 mm间隙的高频脉冲MAG焊(冷焊打底)与常规脉冲MAG焊2种工况的对接焊工艺试验,研究了接头的组织和性能。研究结果表明:2种工况... 文中选用φ(Ar)80%+φ(CO_(2))20%(M21型)的保护气体,对板厚为12 mm的地铁转向架构架用S355J2W耐候钢进行了3 mm间隙的高频脉冲MAG焊(冷焊打底)与常规脉冲MAG焊2种工况的对接焊工艺试验,研究了接头的组织和性能。研究结果表明:2种工况的对接焊接头,焊缝均成形良好,接头无裂纹、气孔等缺陷,且焊缝金属与母材金属熔合良好;接头的显微组织特征类似,为先共析铁素体(GBF)、针状铁素体(AF)和少量珠光体(P)以及少量粒状贝氏体(BG)组织。与常规脉冲MAG焊相比,采用高频脉冲MAG焊(冷焊打底)可获得较为理想的接头组织和性能。 展开更多
关键词 s355j2W耐候钢 高频脉冲MAG焊工艺 组织和性能 对接焊接头 IPP针状铁素体量化
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Recovery from Bell’s palsy after treatment using uncultured umbilical cord-derived mesenchymal stem cells:A case report
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作者 Hyunjun Ahn Won-Ju Jung +1 位作者 Sang Yeon Lee Kye-Ho Lee 《World Journal of Clinical Cases》 SCIE 2023年第12期2817-2824,共8页
BACKGROUND Bell’s palsy is an idiopathic facial palsy with an unknown cause,and 75%of patients heal spontaneously.However,the other 25%of patients continue experiencing mild or severe disabilities,resulting in a redu... BACKGROUND Bell’s palsy is an idiopathic facial palsy with an unknown cause,and 75%of patients heal spontaneously.However,the other 25%of patients continue experiencing mild or severe disabilities,resulting in a reduced quality of life.Currently,various treatment methods have been developed to treat this disease.However,there is controversy regarding their effectiveness,and new alternative treatments are needed.CASE SUMMARY The patient suffered from left-sided facial paralysis due to Bell’s palsy for 7 years.The patient received an uncultured umbilical cord-derived mesenchymal stem cell transplant eight times for treatment.After follow-up for 32 mo,the paralysis was cured,and there was no recurrence.CONCLUSION Uncultured umbilical cord-derived mesenchymal stem cell transplantation may be a potential treatment for patients with Bell’s palsy who do not spontaneously recover. 展开更多
关键词 bells palsy Facial palsy Umbilical cord-mesenchymal stem cells ALLOGENIC Case report
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Bell’s Palsy Post COVID-19 Vaccination: A Retrospective Cross-Sectional Study in a Single Tertiary Center
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作者 Rohaizam Japar Jaafar Kalaiselvi Thuraisingam +1 位作者 Asfa Najmi Mohamad Yusof Iskandar Hailani 《Journal of Biosciences and Medicines》 2023年第12期47-53,共7页
Introduction: Bell’s palsy is an uncommon adverse effect of the COVID-19 vaccine that has been reported in clinical trials. Even though a few studies have linked the vaccination to Bell’s palsy, the actual mechanism... Introduction: Bell’s palsy is an uncommon adverse effect of the COVID-19 vaccine that has been reported in clinical trials. Even though a few studies have linked the vaccination to Bell’s palsy, the actual mechanism is uncertain. Objectives: To describe the demographic data and COVID-19 vaccines-related data with Bell’s palsy in a tertiary centre of Malaysia, Hospital Kuala Lumpur. Methods: A retrospective cross-sectional study was observed among vaccinated recipients who developed Bell’s palsy within 60 days and sought treatment in the Otorhinolaryngology Department Hospital Kuala Lumpur, Malaysia between 1<sup>st</sup> May 2021 and 30<sup>th</sup> November 2021. The demographic data, clinical history, and vaccination history were collected from clinical records. The facial paralysis was graded according to the House-Brackmann grading system. Results: A total of 26 patients with a mean age was 38.5 years;higher incidence in younger age, below 60 years old (n = 24), specifically 18 - 30 years old (n = 11). We observed an equal number in relation to gender and onset (after the first or second dose) of facial palsy. Predominantly were Malay (n = 21) and only 6 patients had comorbidities. We found there was no difference in regard to the type of vaccine among Bell’s palsy patients;Pfizer (n = 9), followed by Sinovac (n = 9) and AstraZeneca (n = 8). Conclusion: Bell’s palsy was found to be a possible adverse event of the COVID-19 vaccine. Younger groups were noted as susceptible to this rare adverse effect. However, the benefits of vaccination outweigh the risk of Bell’s palsy, which has a good prognosis. More research with larger samples is needed to determine the true relationship between vaccination and Bell’s palsy. 展开更多
关键词 bells Palsy COVID-19 VACCINATION
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Einstein-Local Counter-Arguments and Counter-Examples to Bell-Type Proofs
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作者 Karl Hess 《Journal of Modern Physics》 CAS 2023年第2期89-100,共12页
J. S. Bell’s well-known proofs of inequalities (and related work) are shown to be invalidated by two counter-arguments (-examples) that are based on Einstein-local propositions: Bell-type inequalities of Einstein-Pod... J. S. Bell’s well-known proofs of inequalities (and related work) are shown to be invalidated by two counter-arguments (-examples) that are based on Einstein-local propositions: Bell-type inequalities of Einstein-Podolsky-Rosen experiments must include, as virtually all physical theories do, elements of physical reality and their mathematical representations that relate to continua as opposed to exclusively finite numbers. Furthermore, Bell-type inequalities must be valid for all possible experimental geometries that lead to the quantum result. Based on these propositions, violations of Bell-type inequalities are demonstrated without violating Einstein locality, without conspiracy type theories and even for the case that all known “loopholes” are closed. 展开更多
关键词 bells Inequalities Quantum Entanglement EPR Experiments
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Misdiagnosis of Facial Nerve Palsy: A Case Report of Sporadic Vestibular Schwannomas (Non-NFM2) Causing Facial Nerve Palsy Be Misled by Bell’s Palsy in a Child
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作者 Heba Şeyhibrahim Mona Jawish Allaa Shaikh Ibrahim 《Open Journal of Pediatrics》 2023年第4期515-522,共8页
We report a case of a rare sporadic Vestibular Schwannoma of a 9-month-old girl who had a right-sided lower motor type facial nerve palsy. The patient was initially diagnosed with Bell’s palsy and received steroid tr... We report a case of a rare sporadic Vestibular Schwannoma of a 9-month-old girl who had a right-sided lower motor type facial nerve palsy. The patient was initially diagnosed with Bell’s palsy and received steroid treatment accordingly, two months later the patient’s condition deteriorated, and further evaluation of CT and MRI brain was conducted that showed a mass lesion in the posterior fossa causing compression on the facial nerve. Misdiagnosis of facial nerve paralysis is common among children due to multiple related etiologies and varying rates of incidence in comparison to adults. The authors hope to address this issue in this report. Background: Facial nerve paralysis has been a matter of concern for many researchers to understand its nature, causes and presentation according to different age groups. In adults, Bell’s palsy (BP), the idiopathic form of facial nerve paralysis, is more common compared to children where most cases are due to secondary etiologies. Therefore, pediatricians are in an important position to identify these patients early in order to launch the most effective diagnostic and treatment approaches. 展开更多
关键词 Emergency Medicine Facial Never Palsy bells Palsy INFANTs the Pediatric Vestibular schwannoma
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Acupuncture and vitamin B_(12) injection for Bell's palsy:no high-quality evidence exists 被引量:1
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作者 Li-li Wang Ling Guan +2 位作者 Peng-liang Hao Jin-long Du Meng-xue Zhang 《Neural Regeneration Research》 SCIE CAS CSCD 2015年第5期808-813,共6页
OBJECTIVE: To assess the efficacy of acupuncture combined with vitamin B12 acupoint injection versus acupuncture alone to reduce incomplete recovery in patients with Bell's palsy. DATA RETRIEVAL: A computer-based o... OBJECTIVE: To assess the efficacy of acupuncture combined with vitamin B12 acupoint injection versus acupuncture alone to reduce incomplete recovery in patients with Bell's palsy. DATA RETRIEVAL: A computer-based online retrieval of Medline, Web of Science, CNKI, CBM databases until April 2014 was performed for relevant trials, using the key words "Bell's palsy or idiopathic facial palsy or facial palsy" and"acupuncture or vitamin B12 or methylcobalamin". STUDY SELECTION: All randomized controlled trials that compared acupuncture with acupuncture combined with vitamin B12 in patients with Bell's palsy were included in the me- ta-analysis. The initial treatment lasted for at least 4 weeks. The outcomes of incomplete facial recovery were monitored. The scoring index varied and the definition of healing was consistent. The combined effect size was calculated by using relative risk (RR) with 95% confidence interval (C/) using the fixed effect model of Review Manager. MAIN OUTCOME MEASURES: Incomplete recovery rates were chosen as the primary outcome. RESULTS: Five studies involving 344 patients were included in the final analysis. Results showed that the incomplete recovery rate of Bell's palsy patients was 44.50% in the acupuncture combined with vitamin B12 group but 62.57% in the acupuncture alone group. The major acupoints were Taiyang (EX-HN5), Jiache (ST6), Dicang (ST4) and Sibai (ST2). The combined effect size showed that acupuncture combined with vitamin B12 was better than acupuncture alone for the treatment of Belrs palsy (RR = 0.71, 95%CI: 0.58-0.87; P = 0.001), this result held true when 8 patients lost to follow up in one study were included into the analyses (RR = 0.70, 95%CI: 0.58-0.86; P = 0.0005). In the subgroup analyses, the therapeutic effect in patients of the electroacupuncture subgroup was better than in the non-electroacupuncture subgroup (P = 0.024). There was no significant dif- ference in the incomplete recovery rate by subgroup analysis on drug types and treatment period. Most of the included studies were moderate or low quality, and bias existed. CONCLUSION: In patients with Bell's palsy, acupuncture combined with vitamin 812 can reduce the risk of incomplete recovery compared with acupuncture alone in our meta-analysis. Because of study bias and methodological limitations, this conclusion is uncertain and the clinical appli- cation of acupuncture combined with vitamin B12 requires further exploration. 展开更多
关键词 nerve regeneration brain injury facial palsy bells palsy comparison methodologicalquality therapy fixed effect model ACUPUNCTURE incomplete recovery randomized controlled trials ELECTROACUPUNCTURE NsFC grants neural regeneration
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J55套管在含H_(2)S油井采出水中的腐蚀行为研究
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作者 迟九蓉 孙淑娟 +1 位作者 张馨予 刘雅瑞 《化工设计通讯》 CAS 2023年第8期21-22,37,共3页
分别对J55钢的材质与油井采出水水质进行分析,确定试样材质及不同采出水中的离子含量,并通过失重法研究试样在不同条件下的腐蚀规律及机理。结果表明:J55管材在含H_(2)S的采出水中,随着腐蚀时间的增长,腐蚀速率先增大后减小,三种采出水... 分别对J55钢的材质与油井采出水水质进行分析,确定试样材质及不同采出水中的离子含量,并通过失重法研究试样在不同条件下的腐蚀规律及机理。结果表明:J55管材在含H_(2)S的采出水中,随着腐蚀时间的增长,腐蚀速率先增大后减小,三种采出水腐蚀性由强到弱依次为1采出水、2采出水、3采出水,腐蚀程度均属于中度腐蚀。造成腐蚀的主要因素为矿化度,其次是S2-、Cl-含量,腐蚀主要表现在H_(2)S气体在湿性环境附着在管壁造成的腐蚀。 展开更多
关键词 j55 采出水 腐蚀 失重法 H_(2)s
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Intertextuality in“The Love Song of J.Alfred Prufrock”
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作者 ZHU Shuang-jie 《Journal of Literature and Art Studies》 2023年第5期320-326,共7页
T.S.Eliot was a leader of the Modernist movement in poetry.His early poem The Love Song of J.Alfred Prufrock reveals the disappointment,loss,confusion and lack of faith that prevailed in Western society after the Worl... T.S.Eliot was a leader of the Modernist movement in poetry.His early poem The Love Song of J.Alfred Prufrock reveals the disappointment,loss,confusion and lack of faith that prevailed in Western society after the World WarⅠ.In this paper,the text of Love Song will be assessed from the perspective of intertextuality through the connection of the fantasy world and the disconnection of the real world. 展开更多
关键词 The Love song of j.Alfred Prufrock T.s.Eliot INTERTEXTUALITY
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Logical Conflict between Bell’s Locality and Probability Theory
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作者 Karl Hess 《Journal of Modern Physics》 2023年第S1期1762-1770,共9页
Based on “locality” considerations, John Stuart Bell and his followers have derived inequalities and theorems that, when taken together with actual experiments that have been performed by Aspect and others, appear t... Based on “locality” considerations, John Stuart Bell and his followers have derived inequalities and theorems that, when taken together with actual experiments that have been performed by Aspect and others, appear to contradict physical reality as defined by Einstein. However, their specifically applied concept of locality is in conflict with the Fundamental Model of probability theory and the set theoretic definition of conditional probabilities. Bell-type inequalities are, therefore, not adequate to decide ponderous questions regarding physical reality. 展开更多
关键词 bells Inequalities Quantum Entanglement EPR Experiments
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Why Bell’s EPRBA Experiment Is Meaningless
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作者 Han Geurdes 《Journal of Quantum Information Science》 2023年第4期177-181,共5页
We demonstrate that a Bell type of experiment asks the impossible of a Kolmogorovian correlation. An Einstein locality explanation in Bell’s format is therefore excluded beforehand by way of the experimental and stat... We demonstrate that a Bell type of experiment asks the impossible of a Kolmogorovian correlation. An Einstein locality explanation in Bell’s format is therefore excluded beforehand by way of the experimental and statistical method followed. 展开更多
关键词 bells Correlation Formula Basic Probability
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Bell’s Theorem and Einstein’s Worry about Quantum Mechanics
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作者 Han Geurdes 《Journal of Quantum Information Science》 2023年第3期131-137,共7页
With the use of a local dependency on instrument setting parameters of the probability density of local hidden variables, it is demonstrated that a Kolmogorov formulation reproduces the quantum correlation. This is th... With the use of a local dependency on instrument setting parameters of the probability density of local hidden variables, it is demonstrated that a Kolmogorov formulation reproduces the quantum correlation. This is the novelty of the work. In a Bell experiment, one cannot distinguish between Bell’s formula and the here presented local Kolmogorov formula. With the presented formula, no CHSH can be obtained. Therefore, the famous CHSH inequality has no excluding power concerning local extra Einstein parameter models. This result concurs with other previous research concerning difficulties with Bell’s formula. 展开更多
关键词 bells Correlation Formula Basic Measure Theory
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S355J0WP耐候钢高温拉伸性能研究
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作者 刘树刚 《冶金与材料》 2023年第1期23-25,共3页
为探索耐腐蚀钢在高温条件下的强度及塑性,本文研究了S355J0WP耐候钢在250℃及以上高温条件下的拉伸性能。试验结果表明:随着温度的升高,S355J0WP耐候钢的强度发生较大变化,具体表现为强度降低。但屈服强度和抗拉强度下降速率有所不同,... 为探索耐腐蚀钢在高温条件下的强度及塑性,本文研究了S355J0WP耐候钢在250℃及以上高温条件下的拉伸性能。试验结果表明:随着温度的升高,S355J0WP耐候钢的强度发生较大变化,具体表现为强度降低。但屈服强度和抗拉强度下降速率有所不同,屈服强度的下降速率快于抗拉强度。断后伸长率随着温度升高无明显变化,但当高温拉伸温度达到500℃时,断后伸长率出现一定幅度升高。随着温度的升高,圆拱形应力-应变曲线坡度逐渐变大。应力—应变曲线形状的变化主要是由于S355J0WP颈缩后的变形量总体上随着温度的提高而增大。 展开更多
关键词 s355j0WP 屈服强度 抗拉强度 高温拉伸
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热轧H型钢S355J0低温冲击不合格原因分析及改善
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作者 张军利 张年华 +2 位作者 谷庆龙 蔡振波 贾敬伟 《今日制造与升级》 2023年第8期77-79,共3页
针对H型钢S355J0低温冲击不合格的问题,对不合格试样进行了高倍检验、电镜分析,结果表明,夹杂物数量多,特别是A类夹杂数量众多,晶粒度级别低是造成低温冲击性能不合格的主要原因。通过对炼钢转炉、精炼、连铸工序、轧钢工序过程工艺进... 针对H型钢S355J0低温冲击不合格的问题,对不合格试样进行了高倍检验、电镜分析,结果表明,夹杂物数量多,特别是A类夹杂数量众多,晶粒度级别低是造成低温冲击性能不合格的主要原因。通过对炼钢转炉、精炼、连铸工序、轧钢工序过程工艺进行优化调整,硫含量控制在0.01%以下,终轧温度≤920℃,晶粒度级别≥7.5级,极大地改善了热轧H型钢S355J0低温冲击性能。 展开更多
关键词 H型钢 s355j0 低温冲击性能 夹杂物 改善 晶粒度
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基于J2EE的电子教参系统的设计与实现
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作者 王倩丽 《微型电脑应用》 2024年第4期229-232,共4页
为了对图书馆图书资源进行有效利用和管理,提高图书馆资源利用率及师生的参与度,开发了一款基于J2EE平台的电子教参系统。在分析现有电子教参系统存在问题的基础上,从总体架构、功能模块、数据库和系统测试几个方面对系统进行设计,建立... 为了对图书馆图书资源进行有效利用和管理,提高图书馆资源利用率及师生的参与度,开发了一款基于J2EE平台的电子教参系统。在分析现有电子教参系统存在问题的基础上,从总体架构、功能模块、数据库和系统测试几个方面对系统进行设计,建立基于J2EE平台和B/S三层架构的电子教参系统,实现图书馆资源的整合利用,提升系统的安全性。测试结果表明,该系统能够安全、稳定地运行,可以满足读者用户的电子教参需求。基于J2EE的电子教参系统访问量大幅提升,受到广大师生的青睐,能更好地为师生的教学、科研提供知识服务。 展开更多
关键词 电子教参 j2EE B/s 系统建设
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Shanghai Bell──the First Joint Venture in China's Telecommunications Industry
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《China's Foreign Trade》 1999年第1期43-45,共3页
关键词 shanghai bell the First joint Venture in China’s Telecommunications Industry
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针灸治疗Bell's面瘫疗效的系统评价 被引量:19
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作者 何俐 周沐科 +2 位作者 周东 李宁 吴滨 《中国循证医学杂志》 CSCD 2005年第2期106-109,129,共5页
目的 系统评价针灸促进Bell s面瘫康复和减少其远期发病率的效果。方法 计算机检索MED LINE、EMBASE、LILAS、中国生物医学文献数据库和Cochrane肌肉疾病组注册组资料库 ,检索时间截止至 2 0 0 2年 12月 ;同时检索其它相关灰色文献 ,... 目的 系统评价针灸促进Bell s面瘫康复和减少其远期发病率的效果。方法 计算机检索MED LINE、EMBASE、LILAS、中国生物医学文献数据库和Cochrane肌肉疾病组注册组资料库 ,检索时间截止至 2 0 0 2年 12月 ;同时检索其它相关灰色文献 ,获取所有涉及针灸治疗Bell s面瘫的随机和半随机对照试验。而后选择符合纳入标准的临床试验 ,评价其方法学质量 ,并从中提取患者基本情况、干预措施、终点指标和结果等相关资料进行系统评价。结果 共有 3个小规模的临床随机对照试验 ,合计 2 88例患者符合纳入标准 ,但因其在试验设计、报道上存在明显缺陷 ,以及试验之间存在较大差异 ,不符合Meta分析条件 ,因而只进行了定性分析。结果显示 ,针灸治疗Bell s面瘫有一定疗效 (P均 <0.0 1)。结论 针灸治疗Bell s面瘫有效 ,但入选的 3个随机对照试验规模小 ,质量不高 ,降低了这一结论的可靠性。开展高质量、内在真实性好的相关随机对照试验非常必要。 展开更多
关键词 针灸 bells面瘫 随机对照试验 系统评价
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瞬目反射、面神经电图、肌电图在Bell′s麻痹患者中的应用价值 被引量:10
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作者 孙海峰 沙彦妮 +2 位作者 周立民 杨平 刘南平 《实用临床医药杂志》 CAS 2010年第6期65-66,共2页
关键词 bells麻痹 瞬目反射 面神经肌电图
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S355J2W耐候钢焊接接头显微组织与力学性能 被引量:14
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作者 张励忠 刘博维 +2 位作者 张淘 宋志坤 刘畅 《北京交通大学学报》 CAS CSCD 北大核心 2012年第4期127-130,134,共5页
通过拉伸、疲劳和金相检验试验,对S355J2W耐候钢、空冷状态焊接接头和退火状态焊接接头进行了显微组织和力学性能的研究.结果表明:两种状态焊接接头的力学性能都达到了要求,S355J2W耐候钢退火状态焊接接头的强度低于空冷状态焊接接头的... 通过拉伸、疲劳和金相检验试验,对S355J2W耐候钢、空冷状态焊接接头和退火状态焊接接头进行了显微组织和力学性能的研究.结果表明:两种状态焊接接头的力学性能都达到了要求,S355J2W耐候钢退火状态焊接接头的强度低于空冷状态焊接接头的强度;退火状态焊接接头的塑性好于空冷状态焊接接头的塑性;退火状态焊接接头的疲劳寿命低于空冷状态焊接接头的疲劳寿命;退火状态焊接接头与空冷状态焊接接头相比,每个区域的晶粒都有明显的细化和均匀化,空冷状态的焊接接头显微组织的晶界比较清晰. 展开更多
关键词 s355j2W钢 焊接接头 力学性能 显微组织
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