Welding Journal最新文献

Postweld Heat Treatment of 15Cr-6Ni-2Mo-1Cu Supermartensitic Stainless Steel Welds 15Cr-6Ni-2Mo-1Cu 超马氏体不锈钢焊缝的焊后热处理

Welding Journal Pub Date : 2024-04-01 DOI: 10.29391/2024.103.022

Richard E. Baumer, Ezequiel Caires Pereira Pessoa, Karthik Krishnan, Thanh NAM VU

引用次数: 0

The Formation Mechanism and Suppression Strategies of Spatter in Pulsed Gas Metal Arc Welding for Titanium Alloy 钛合金脉冲气体金属弧焊中飞溅物的形成机理与抑制策略

Welding Journal Pub Date : 2024-04-01 DOI: 10.29391/2024.103.020

Zhendan Zheng, Shaojie Wu, Limin Fan, Hao Wu, Fangjie Cheng

{"title":"The Formation Mechanism and Suppression Strategies of Spatter in Pulsed Gas Metal Arc Welding for Titanium Alloy","authors":"Zhendan Zheng, Shaojie Wu, Limin Fan, Hao Wu, Fangjie Cheng","doi":"10.29391/2024.103.020","DOIUrl":"https://doi.org/10.29391/2024.103.020","url":null,"abstract":"The GMAW process for titanium alloy is not commonly applied within the industry due to the occurrence of severe spatter. This research endeavors to elucidate the mechanism underlying spatter formation and explore efficacious strategies to suppress spatter. The experimental results demonstrated the existence of two distinct spatter types: large and small spatter particles. The high- speed images and synchronous electrical signals were utilized for determining the spatter formation mechanism, with force analysis serving to mutually validate the inferences. The large spatter particles originated from the whole transitional molten droplet as it descended within the arc space, while the small spatter particles were formed by the partial transitional molten droplet as it contacted the weld pool. The cathode jet force accounted for the formation of large spatter particles, whereas the electromagnetic force was responsible for the small spatter particles. To suppress spatter, increasing detachment current and decreasing pulsing frequency were employed. Consequently, the spatter rate witnessed a remarkable decrease from 14.00% to 3.33% with a progressive increment in detachment current from 100 A to 300 A, and a corresponding decline from 12.67% to 1.33% upon decrementing the pulsing frequency from 90 Hz to 50 Hz. This research suggests that a judicious increase in the detachment current can effectively decrease the spatter rate while concurrently preserving welding efficiency.","PeriodicalId":509696,"journal":{"name":"Welding Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140796153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Monitoring Welding Torch Position and Posture Using Reversed Electrode Images – Part II, Experimental and Analysis for the REI-TPA Model 利用反向电极图像监控焊枪位置和姿势 - 第二部分，REI-TPA 模型的实验和分析

Welding Journal Pub Date : 2024-04-01 DOI: 10.29391/2024.103.021

YU Fu, Runquan Xiao, Shanben Chen

{"title":"Monitoring Welding Torch Position and Posture Using Reversed Electrode Images – Part II, Experimental and Analysis for the REI-TPA Model","authors":"YU Fu, Runquan Xiao, Shanben Chen","doi":"10.29391/2024.103.021","DOIUrl":"https://doi.org/10.29391/2024.103.021","url":null,"abstract":"This paper is a sequel to the previous paper. In the previous research (Ref. 1), a REI-TPA model was established to quantitively relate reversed electrode images (REIs) to welding torch position and attitude (TPA). In this research, the REI-TPA model was validated with bead-on-plate welding experiments on S304 stainless steel plates. The contours of the REI and electrode as well as the weld pool geometry were extracted from the image with a developed, robust algorithm, and the arc length was calculated with welding voltage. The offset distance and deflection angle of the welding torch relative to the correct position and attitude were calculated by inputting the extracted parameters into the REI-TPA model. The computational result was compared to the experimental data. The result showed that the model is correct and the monitoring of the welding torch with the REI-TPA model is available. The REI- TPA model can be applied to real-time control of TPA, which is a supplement to the application of the weld passive visual image and an extension of multi- information acquisition and processing methods in the welding process.","PeriodicalId":509696,"journal":{"name":"Welding Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140770529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of As-Welded Microstructure in a P91 Steel P91 钢焊接后微观结构的表征

Welding Journal Pub Date : 2024-03-01 DOI: 10.29391/2024.103.006

A. Marzocca, C. A. Danón, M. Luppo, Flavio Soldera, M. Zalazar

{"title":"Characterization of As-Welded Microstructure in a P91 Steel","authors":"A. Marzocca, C. A. Danón, M. Luppo, Flavio Soldera, M. Zalazar","doi":"10.29391/2024.103.006","DOIUrl":"https://doi.org/10.29391/2024.103.006","url":null,"abstract":"The microstructure of the heat affected zone (HAZ) and fusion zone (FZ) in the as-welded condition of a single-pass weld performed by the flux-cored arc welding (FCAW) process was studied in a P91 steel using microhardness measurements, field-emission scanning electron microscopy, transmission electron microscopy, and x-ray diffraction. The evolution of precipitates in each region of the single-pass weld was analyzed, and particular attention was paid to the presence of retained austenite (RA). Experimental observations indicated that M23 C6 carbide played a major role in the thermal cycle associated with the weldment. On one hand, the dissolution of M23 C6 led to the precipitation of spherical NbCN in the finegrained HAZ (FGHAZ) near the coarse-grained HAZ (CGHAZ). On the other hand, the total or partial dissolution of M23 C6 carbides changed the chemical composition of the initially formed austenite. In the regions where the M23 C6 carbides were completely dissolved (i.e., the CGHAZ and FZ), retained austenite was observed as a thin, continuous film along primary austenite grains and lath boundaries. Instead, a shell of retained austenite was observed around some partially dissolved M23 C6 of the intercritical HAZ (ICHAZ) and FGHAZ.","PeriodicalId":509696,"journal":{"name":"Welding Journal","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140090666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cutting and Shield Gases Pressure Effects on Plasma Cutting Quality 切割和保护气体压力对等离子切割质量的影响

Welding Journal Pub Date : 2024-03-01 DOI: 10.29391/2024.103.007

S. Chabert, Jean-Jacques Gonzalez, P. Freton

引用次数: 0

Multiphysics Simulation of In-Service Welding and Induction Preheating: Part 2 在役焊接和感应预热的多物理场仿真：第二部分

Welding Journal Pub Date : 2024-03-01 DOI: 10.29391/2024.103.008

Kauê Correa Riffel, R. H. Gonçalves e Silva, Antonio Ramirez, Andres FABRICIO FISCHDICK ACUNA, G. Dalpiaz, Marcelo TORRES PIZA PAES

引用次数: 0

Multiphysics Simulation of In-Service Welding and Induction Preheating: Part 1 在役焊接和感应预热的多物理场仿真：第 1 部分

Welding Journal Pub Date : 2024-02-01 DOI: 10.29391/2024.103.005

K. C. Riffel, R. H. Gonçalves e Silva, Antonio Ramirez, Andres Fabricio FISCHDICK ACUNA, G. Dalpiaz, Marcelo Torres Piza Paes

引用次数: 0