Welding Journal最新文献_第5页

Metallurgical Design Rules for High-Strength Steel Weld Metals 高强度钢焊接金属的冶金设计规则

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-05-01 DOI: 10.29391/2022.101.010

K. Sampath

{"title":"Metallurgical Design Rules for High-Strength Steel Weld Metals","authors":"K. Sampath","doi":"10.29391/2022.101.010","DOIUrl":"https://doi.org/10.29391/2022.101.010","url":null,"abstract":"A review of a dilatometric analysis of selected Fe-C-Mn high-strength steel shielded metal arc weld metals showed that balanced Ti, B, Al, O, and N additions reduced the austenite-to-ferrite transformation-start (TS) temperature. These microalloy additions must match the following aim levels for composition control: Ti at 400 ppm (0.04 wt-%), B at 40 ppm (0.004 wt-%), Al at 200 ppm (0.020 wt-%), O at 400 ppm (0.04 wt-%), and N preferably below 80 ppm (0.008 wt-%) to ensure effective deoxidation, form complex inclusions, and distribute them to enable development of highly fracture-resistant refined weld metal microstructures. It may be wiser to avoid the rich and lean ends for these microalloy additions, except N, which should be held at the lean end, preferably much below 80 ppm (0.008 wt-%). The balanced Ti, B, Al, O, and N additions offered nearly a 100°C shift in lowering the Charpy V-notch (CVN) test temperature for either 28 or 100 J absorbed energy. Dilatometric evaluations of reheated weld metals showed that 1) the balanced Ti, B, Al, O, and N additions lowered the actual TS temperature by about 60°C compared to the calculated austenite-to-ferrite transformation temperature obtained from the constitutional equation; 2) N with more than 100 ppm (0.010 wt-%) effectively nullified the beneficial effects of Ti, B, and Al additions in lowering the transformation temperature; and 3) at N content much below 80 ppm (0.008 wt-%), both a lower TS temperature and a narrow start-to-finish (TS–Tf) temperature range helped in achieving exceptional weld metal CVN impact toughness.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48841646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Entire Process Simulation of Friction Stir Welding — Part 1: Experiments and Simulation 搅拌摩擦焊接全过程模拟。第1部分:实验和模拟

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-05-01 DOI: 10.29391/2022.101.011

Yuming Xie, Xiangchen Meng, Yongxian Huang

引用次数: 14

The Effects of Postweld Processing on Friction Stir Welded, Additive Manufactured AlSi10Mg 焊后处理对搅拌摩擦焊接AlSi10Mg的影响

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-04-01 DOI: 10.29391/2022.101.009

M. Eff, Drew Shipley, H. Hack, Seth Shira

{"title":"The Effects of Postweld Processing on Friction Stir Welded, Additive Manufactured AlSi10Mg","authors":"M. Eff, Drew Shipley, H. Hack, Seth Shira","doi":"10.29391/2022.101.009","DOIUrl":"https://doi.org/10.29391/2022.101.009","url":null,"abstract":"Given the limited build volumes for most current additive manufacturing (AM) machines, a method for taking advantage of the unique capabilities offered by AM while combining it with traditional manufacturing methods is needed. Welding of AM-produced components is a solution to this challenge. The objective of this study was to determine the feasibility of using friction stir welding (FSW) to join AlSi10Mg melted with laser powder bed fusion (PBF-L) and examine the effects of postweld heat treatment (HT) and hot isostatic pressing (HIP) on overall joint quality and mechanical performance. Samples were examined using optical microscopy, scanning electron microscopy, hardness testing, and tensile testing. Examination of the samples that underwent a postweld annealing HT revealed cracking along the stir zone and the thermomechanically affected zone (TMAZ) boundary. Examination of the crack revealed evidence of liquation near single-phase silicon precipitates in the TMAZ despite the annealing temperature being 27°C (81°F) below the solidus temperature of the material according to the material specification. Using a calculated pseudobinary phase diagram of AlSi10Mg, the annealing HT was determined to be in the partial liquation regime for AlSi10Mg. The voids and crack formation mechanisms were determined to be caused by constitutional liquation coupled with the unique TMAZ microstructure and stress state. The as-welded and HIP coupons were void and defect free, and FSW was determined to be a feasible method of joining PBF-L aluminum alloys with minimal knockdown in tensile strength.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":"1 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70004246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Heterogeneous Measurement System for Data Mining Robotic GMAW Weld Quality 数据挖掘机器人GMAW焊接质量的异构测量系统

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-03-01 DOI: 10.29391/2022.101.008

Adewole Ayoade, J. Steele

{"title":"Heterogeneous Measurement System for Data Mining Robotic GMAW Weld Quality","authors":"Adewole Ayoade, J. Steele","doi":"10.29391/2022.101.008","DOIUrl":"https://doi.org/10.29391/2022.101.008","url":null,"abstract":"During robotic welding, several streams of heterogeneous data can be collected. To gain a systemic understanding of the welding process, these data streams have to be combined precisely and accurately, especially if our goal is to develop online weld quality assessments. Establishing correspondence among temporal and spatially based data is a nontrivial effort. This article presents a data collection system using a novel methodology for establishing correspondence across multiple data sources of robotic gas metal arc welding for objective quality assessment. First, correspondence between the weld process data and the resulting weld required time synchronization and spatial alignment. Second, an objective weld quality extraction technique that assigns quantitative measures at a resolution of 1 mm of linear weld travel was developed to evaluate weld quality. Specifically, in addition to developing a method for objective weld profile assessment, we developed an objective analysis of radiographic data for the occurrence of subsurface porosity to assess defects and demonstrate how to objectively quantify the occurrence of surface porosity. While some aspects of this paper have been addressed individually and separately by other research, this paper presents an integrated approach to these operations for a wide variety of weld data types and develops objective weld quality metrics that can be used for machine learning of weld quality for robotic welding.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42019625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ductile Braze Repairs for Ni-Based Superalloys Using Novel MPEA Filler Metal 新型MPEA填充金属钎焊修复镍基高温合金

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-03-01 DOI: 10.29391/2022.101.007

B. Schneiderman, O. Denonno, J. Klemm-Toole, Zhenzhen Yu

{"title":"Ductile Braze Repairs for Ni-Based Superalloys Using Novel MPEA Filler Metal","authors":"B. Schneiderman, O. Denonno, J. Klemm-Toole, Zhenzhen Yu","doi":"10.29391/2022.101.007","DOIUrl":"https://doi.org/10.29391/2022.101.007","url":null,"abstract":"The performance of a newly developed multiprincipal-element alloy (MPEA) filler metal for brazing of nickel-based superalloys was directly compared to a conventional boron- and silicon-suppressed filler (BSSF) metal. The comparison was demonstrated on an Alloy 600 substrate with a brazing temperature of 1200°C. Single-phase solidification behavior and the absence of boron and silicon in the MPEA led to a joint microstructure devoid of eutectic constituents or brittle phases in brazes employing this filler metal. In the brazes using the conventional BSSF metal, incomplete isothermal solidification and subsequent athermal solidification of the residual liquid resulted in large particles of a chromium-rich boride phase distributed throughout the microstructure. Tensile testing of brazed butt joints at both room temperature and 600°C testing conditions demonstrated that the MPEA joints exhibited total ductility values at least one order of magnitude greater than that of BSSF joints, but they showed comparable yield strengths in both testing conditions. Fractographic assessment confirmed that boride phases nucleated cracks and resulted in brittle failure in the BSSF joints, while the MPEA joints exhibited extensive ductile microvoid coalescence. Fine-scale porosity and oxide inclusions may be the dominant factors limiting the overall ductility observed in the MPEA brazes.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46696823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effects of Electrode Combinations on RSW of 5182-O/AlSi10MnMg Aluminum 电极组合对5182-O/AlSi10MnMg铝RSW的影响

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-02-01 DOI: 10.29391/2022.101.005

Yanjun Wang, Shanglu Yang

引用次数: 2

Investigation and Optimization of Resistance Implant Welding of Polypropylene Sheets 聚丙烯薄板电阻焊工艺的研究与优化

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-02-01 DOI: 10.29391/2022.101.004

H. Bakirci, İ. Karagöz, M. Kaya

引用次数: 0

The Toughness of High-Strength Steel Weld Metals 高强度钢焊接金属的韧性

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-02-01 DOI: 10.29391/2022.101.006

T. Dai, Zhili Feng, Doug Kyle, S. David, K. Sebeck, Demetrios A. Tzelepis, Katherine Vieau, M. Rogers

{"title":"The Toughness of High-Strength Steel Weld Metals","authors":"T. Dai, Zhili Feng, Doug Kyle, S. David, K. Sebeck, Demetrios A. Tzelepis, Katherine Vieau, M. Rogers","doi":"10.29391/2022.101.006","DOIUrl":"https://doi.org/10.29391/2022.101.006","url":null,"abstract":"Low-temperature phase transformation (LTPT) welding consumables are a new class of welding wires developed to mitigate hydrogen-induced cracking in the welding of high-strength steels without preheating or postweld heat treatment. LTPT weld metals have a high strength, but their toughness needs further investigation. LTPT weld metals predominately contain a martensite microstructure, which is necessary to achieve high strength; however, martensitic weld metals containing oxide inclusions have relatively poor toughness. Three welding processes — gas metal arc welding (GMAW), gas tungsten arc welding (GTAW), and hot wire GTAW — were investigated. Optical microscopy, scanning electron microscopes, and transmission electron microscopes were employed for characterization. The role of the shielding gas in the formation of oxide inclusions in LTPT weld metals was investigated. The formation of oxide inclusions in the weld metals was related to the CO2 in the shielding gas. When 100% Ar or a pure inert shielding gas mixture was used for all three welding processes, oxide inclusions were greatly reduced, and the weld metal toughness improved considerably, matching the base metal toughness. The mechanism by which inclusions promote fracture propagation in the weld metal was proposed.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46143523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

VHCF Behavior of Welded Joints with HFMI Treatment under Moisture Conditions 湿气条件下HFMI处理焊接接头的VHCF行为

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-01-01 DOI: 10.29391/2022.101.003

Zhiwei Gao, Dong-po Wang, B. Gong, C. Deng, Shaojie Wu, Hai Zhang

引用次数: 1

Hybrid Laser-Arc Welding of Thick-Walled, Closed, Circumferential Pipe Welds 厚壁、封闭、周向管道焊缝的激光电弧复合焊接

IF 2.2 3区材料科学

Welding Journal Pub Date : 2022-01-01 DOI: 10.29391/2022.101.002

Ömer Üstündağ, S. Gook, A. Gumenyuk, M. Rethmeier, N. Bakir

{"title":"Hybrid Laser-Arc Welding of Thick-Walled, Closed, Circumferential Pipe Welds","authors":"Ömer Üstündağ, S. Gook, A. Gumenyuk, M. Rethmeier, N. Bakir","doi":"10.29391/2022.101.002","DOIUrl":"https://doi.org/10.29391/2022.101.002","url":null,"abstract":"The application of hybrid laser-arc welding (HLAW) for joining closed circumferential welds is a challenge due to the high risk of forming a defective overlap area with a shrinkage void or solidification cracks in the material thickness. A series of HLAW experiments were performed to understand the development of a faulty overlap area when closing the circumferential weld. Welding trials on flat specimens and pipe segments were supported by numerical analyses in which the thermomechanical behavior of the welds in the overlap area was investigated. Different process control strategies were tested, including variations in defocusing levels and the overlap length. The newly developed HLAW head, including laser optics with a motor-driven collimation system, made it possible to defocus the laser beam during welding without disturbing the stability of the welding process. High-level defocusing of the laser beam of more than 40 mm relative to the specimen surface with a resulting beam diameter of > 2.9 mm, and in combination with a short overlap length of 15 mm, was promising with respect to the formation of a desired cup-shaped weld profile that is resistant to solidification cracks.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43285401","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0