Article(id=1192092198821835222, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1192092198389821910, articleNumber=null, orderNo=null, doi=10.19710/J.cnki.1003-8817.20240407, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=null, receivedDateStr=null, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1762146528201, onlineDateStr=2025-11-03, pubDate=1750348800000, pubDateStr=2025-06-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1762146528201, onlineIssueDateStr=2025-11-03, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1762146528201, creator=13701087609, updateTime=1762146528201, updator=13701087609, issue=Issue{id=1192092198389821910, tenantId=1146029695717560320, journalId=1189873562199433220, year='2025', volume='', issue='6', pageStart='1', pageEnd='71', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1762146528098, creator=13701087609, updateTime=1762146867447, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1192093621789803196, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1192092198389821910, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1192093621789803197, tenantId=1146029695717560320, journalId=1189873562199433220, issueId=1192092198389821910, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=15, endPage=20, ext={EN=ArticleExt(id=1192092198997995992, articleId=1192092198821835222, tenantId=1146029695717560320, journalId=1189873562199433220, language=EN, title=Research on the Microstructure and Properties of AZ31B Magnesium Alloy CMT Cycle Step Welded Joint, columnId=null, journalTitle=Automobile Technology & Material, columnName=null, runingTitle=null, highlight=null, articleAbstract=
This paper investigates the microstructure, mechanical properties and elemental distribution of welded joints using the CMT Cycle Step process with AZ81 filler wire for AZ31B magnesium alloy extruded plates to develop new welding technologies for magnesium alloys. Comprehensive characterization is performed through optical microscopy, Vickers hardness tester, tensile testing machine, Scanning Electron Microscopy (SEM) and Energy-Dispersive X-ray Spectroscopy (EDS). The experimental results demonstrate that uniform and regular fish-scale patterns are formed on the weld surface. The weld zone primarily consists of α-Mg phase with discontinuous eutectic structures at grain boundaries. While Zn element distribution shows no significant concentration difference across the base metal, fusion zone, and weld zone, Al element exhibits markedly higher concentration in the weld region compared to the base material. The maximum hardness is observed in the weld zone, with a distinct softening phenomenon characterized by significant hardness reduction in the Heat-Affected Zone (HAZ). The tensile strength of the welded joint reaches levels comparable to the base material. Tensile fractures occur in the HAZ, presenting pure shear fracture surfaces with morphological features indicative of ductile fracture characteristics.
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为了研发镁合金新的焊接技术,采用冷金属过渡循环步进(CMT Cycle Step)工艺,以AZ81为焊丝焊接AZ31B镁合金挤压板材,通过光学显微镜、维氏硬度计、拉伸试验机、扫描电镜(SEM)和能谱仪(EDS)分析等手段,研究了焊接接头的显微组织、力学性能及元素分布。试验结果表明:焊缝表面形成了均匀且规则的鱼鳞纹;焊缝区主要由α-Mg相和晶界处不连续的共晶组织组成,Zn元素在母材、熔合区及焊缝区没有明显的浓度差异,Al元素在焊缝区域的浓度明显高于母材;焊缝区域硬度最高,热影响区(HAZ)中出现了硬度明显降低的软化现象;焊接接头抗拉强度接近母材;拉伸断裂于热影响区,为纯剪切断口,断口形貌表现出韧性断裂特征。
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黄昌军(1985—),男,工程师,硕士学位,研究方向为镁合金焊接。
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黄昌军(1985—),男,工程师,硕士学位,研究方向为镁合金焊接。
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49(23): 16-18+22., articleTitle=AZ31B镁合金型材TIG-MIG复合焊接头的组织与力学性能, refAbstract=null)], funds=[Fund(id=1192092536920486675, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1192092198821835222, awardId=2021YFB3701100, language=CN, fundingSource=国家重点研发计划资助项目(2021YFB3701100), fundOrder=null, country=null), Fund(id=1192092536995984148, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1192092198821835222, awardId=XTCX-KJ-2022-2-11, language=CN, fundingSource=上海市科技创新项目资助项目(XTCX-KJ-2022-2-11), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1192092532562604756, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1192092198821835222, xref=1, ext=[AuthorCompanyExt(id=1192092532570993365, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1192092198821835222, companyId=1192092532562604756, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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| 元素 | Al | Zn | Mn | Fe |
| AZ31B母材 | 3.190 | 0.810 | 0.330 | 0.003 |
| AZ81焊丝 | 8.310 | 0.988 | 0.294 | 0.004 |
| 元素 | Si | Cu | Ni | Mg |
| AZ31B母材 | 0.121 | 0.006 | 0.001 | 余量 |
| AZ81焊丝 | 0.010 | 0.001 | 0.002 | 余量 |
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AZ31B母材及AZ81焊丝化学元素(质量分数) %
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| 元素 | Al | Zn | Mn | Fe |
| AZ31B母材 | 3.190 | 0.810 | 0.330 | 0.003 |
| AZ81焊丝 | 8.310 | 0.988 | 0.294 | 0.004 |
| 元素 | Si | Cu | Ni | Mg |
| AZ31B母材 | 0.121 | 0.006 | 0.001 | 余量 |
| AZ81焊丝 | 0.010 | 0.001 | 0.002 | 余量 |
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| 参数 | 送丝 速度 /m·min-1 | 焊接电流/A | 熔滴数量/个 | 间隔 时间/s | 焊接 速度 /mm·min-1 | 间隙 /mm |
| 数值 | 10.6 | 176 | 10 | 0.11 | 400 | 1.2 |
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CMT Cycle Step工艺焊接参数
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| 参数 | 送丝 速度 /m·min-1 | 焊接电流/A | 熔滴数量/个 | 间隔 时间/s | 焊接 速度 /mm·min-1 | 间隙 /mm |
| 数值 | 10.6 | 176 | 10 | 0.11 | 400 | 1.2 |
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| 试样类型 | 抗拉强度 /MPa | 屈服强度 /MPa | 断后 伸长率/% |
| AZ31B母材 | 266.4 | 93.2 | 19.3 |
| 焊接接头 | 264.4 | 99.6 | 12.8 |
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AZ31B母材及焊接接头力学性能
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| 试样类型 | 抗拉强度 /MPa | 屈服强度 /MPa | 断后 伸长率/% |
| AZ31B母材 | 266.4 | 93.2 | 19.3 |
| 焊接接头 | 264.4 | 99.6 | 12.8 |
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