Welding Journal最新文献_第7页

Parametric Study of Automated Electrospark Deposition for Ni-Based Superalloys 镍基高温合金自动电火花沉积参数化研究

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-07-01 DOI: 10.29391/2021.100.021

P. Enrique, Stephen Peterkin, N. Zhou

引用次数: 4

A State-of-the-Art Review of Laser Welding of Polymers - Part I: Welding Parameters 聚合物激光焊接技术综述——第一部分：焊接参数

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-07-01 DOI: 10.29391/2021.100.019

Nitesh Kumar, Nikhil Kumar, A. Bandyopadhyay

引用次数: 5

Post Underwater Wet Welding Heat Treatment by Underwater Wet Induction Heating 水下湿感应加热水下湿焊后热处理

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-07-01 DOI: 10.29391/2021.100.020

E. Pessoa, A. Bracarense, V. Santos, R. R. Marinho, Henrique Leite Assunção, F. Rizzo

{"title":"Post Underwater Wet Welding Heat Treatment by Underwater Wet Induction Heating","authors":"E. Pessoa, A. Bracarense, V. Santos, R. R. Marinho, Henrique Leite Assunção, F. Rizzo","doi":"10.29391/2021.100.020","DOIUrl":"https://doi.org/10.29391/2021.100.020","url":null,"abstract":"Wet welding procedures of Class A structural ship steels frequently fail to comply with the American Welding Society (AWS) D3.6M, Underwater Welding Code, in the maximum hardness criterion for the heat-affected zone (HAZ). The maximum hardness accepted in a welded joint is 325 HV for higher-strength steel (yield strength > 350 MPa). In multi-pass welds, this problem occurs frequently and is restricted to the HAZ of the capping passes. The HAZ of the root and filling passes are softened by the reheating promoted by their respective subsequent passes. This paper presents the results of exploratory research into postweld underwater electromagnetic induction heating. The objective of the research was to evaluate the ability of induction heating to soften the specific high-hardness HAZs in underwater conditions. The results showed that this technique could reduce the maximum HAZ hardness of low-carbon structural ship steel welds to values below 325 HV, which is the maximum accepted by AWS for Class A welds. The induction-heated zone reached a maximum depth of about 10 mm, which is considered adequate to treat the HAZ of cap-ping passes in underwater wet welds.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48269658","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: 4

∝-Ferrite Suppression during Fiber Laser Welding of Al-Si Coated 22MnB5 Press-Hardened Steel 铝硅涂层22MnB5压淬钢纤维激光焊接过程中铁素体的抑制

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-06-01 DOI: 10.29391/2021.100.018

Muhammad Shehryar Khan, E. Biro, Yixiang Zhou, A. Macwan

引用次数: 12

Brazing Si3N4 Ceramic to Molybdenum Using an Ag-Cu-Ti Filler 用Ag-Cu-Ti填料钎焊Si3N4陶瓷与钼

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-06-01 DOI: 10.29391/2021.100.017

Tong Zhao, Deqing Mo, Li Yu, Yu Wang, Jun Li, Xue Li, D. Liu, Xiao Kun Wang, H. Gong

引用次数: 1

Recent Advances in the Prediction of Weld Residual Stress and Distortion - Part 2 焊接残余应力和变形预测的最新进展-第二部分

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-06-01 DOI: 10.29391/2021.100.016

Yu-ping Yang

{"title":"Recent Advances in the Prediction of Weld Residual Stress and Distortion - Part 2","authors":"Yu-ping Yang","doi":"10.29391/2021.100.016","DOIUrl":"https://doi.org/10.29391/2021.100.016","url":null,"abstract":"Weld residual stress can contribute to the reduction of structure lifetime and accelerate the formation of fatigue cracks, brittle fractures, or stress corrosion cracking. Distortion can have a significant impact on the dimensional ac-curacy of assembly, structure strength, and fabrication cost. In the past two decades, there have been many significant and exciting developments in the prediction and mitigation of weld residual stress and distortion. This paper reviews the recent advances in mitigation techniques that have been applied in the structure design, manufacturing, and postweld stages. The techniques used in the structure design stage include selecting the type of weld joint and weld groove, using balanced welding, determining appropriate plate thickness and stiffener spacing, and considering distortion compensation. Mitigation techniques used in the manufacturing stage include welding sequence optimization, reducing welding heating input, selecting low-transformation-temperature filler metals, prebending, precambering, constraints, trailing and stationary cooling, in-processing rolling, transient thermal tensioning, and additional heat sources. Postweld mitigation techniques include postweld heating and mechanical treatment. Finally, the remaining challenges and new development needs were discussed to guide future development in the field of mitigating weld residual stress and distortion.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47486248","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: 9

Recent Advances in the Prediction of Weld Residual Stress and Distortion - Part 1 焊接残余应力和变形预测的最新进展-第1部分

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-05-01 DOI: 10.29391/2021.100.013

Yu-ping Yang

引用次数: 10

The State of the Art of Underwater Wet Welding Practice: Part 2 水下湿焊技术现状:第2部分

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-05-01 DOI: 10.29391/2021.100.014

E. Pessoa, Stephen Liu

{"title":"The State of the Art of Underwater Wet Welding Practice: Part 2","authors":"E. Pessoa, Stephen Liu","doi":"10.29391/2021.100.014","DOIUrl":"https://doi.org/10.29391/2021.100.014","url":null,"abstract":"Developments in underwater wet welding (UWW) over the past four decades are reviewed, with an emphasis on the re-search that has been conducted in the last ten years. Shielded metal arc welding with rutile-based coated electrodes was established as the most applied process in the practice of wet welding of structural steels in shallow water. The advancements achieved in previous decades had already led to control of the chemical composition and microstructure of weld metals. Research and development in consumables formulation have led to control of the amount of hydrogen content and the level of weld porosity in the weld metal. The main focus of research and development in the last decade was on weldability of naval and offshore structural steels and acceptance of welding procedures for Class A weld classification according to American Welding Society D3.6, Underwater Welding Code. Applications of strictly controlled welding techniques, including new postweld heat treatment procedures, allowed for the welding of steels with carbon equivalent values greater than 0.40. Classification societies are meticulously scrutinizing wet welding procedures and wet weld properties in structural steels at depths smaller than 30 m prior to qualifying them as Class A capable. Alternate wet welding processes that have been tested in previous decades — such as friction stir welding, dry local habitat, and gas metal arc welding — have not achieved great success as originally claimed. Almost all of the new UWW process developments in the last decade have focused on the flux cored arc welding (FCAW) process. Part 1 of this paper covered developments in microstructural optimization and weld metal porosity control for UWW. Part 2 discusses the hydrogen pickup mechanism, weld cooling rate control, design, and qualification of consumables. It ends with a description of the advancements in FCAW applications for UWW.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44365679","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: 14

Automated Recognition of Weld Pool Characteristics from Active Vision Sensing 基于主动视觉感知的熔池特征自动识别

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-05-01 DOI: 10.29391/2021.100.015

Yongchao Cheng, Qiyue Wang, Wenhua Jiao, Jun Xiao, Shujun Chen, Yuming Zhang

{"title":"Automated Recognition of Weld Pool Characteristics from Active Vision Sensing","authors":"Yongchao Cheng, Qiyue Wang, Wenhua Jiao, Jun Xiao, Shujun Chen, Yuming Zhang","doi":"10.29391/2021.100.015","DOIUrl":"https://doi.org/10.29391/2021.100.015","url":null,"abstract":"While penetration occurs underneath the workpiece, the raw information used to detect it during welding must be measurable to a sensor attached to the torch. Challenges are apparent because it is difficult to find such measurable raw information that fundamentally correlates with the phenomena occurring underneath. Additional challenges arise because the welding process is extremely complex such that analytically correlating any raw information to the underneath phenomena is practically impossible; therefore, handcrafted methods to propose features from raw information are human dependent and labor extensive. In this paper, the profile of the weld pool surface was proposed as the raw information. An innovative method was proposed to acquire it by projecting a single laser stripe on the weld pool surface transversely and intercepting its reflection from the mirror-like weld pool surface. To minimize human intervention, which can affect success, a deep-learning-based method was proposed to automatically recognize features from the single-stripe active vision images by fitting a convolutional neural network (CNN). To train the CNN, spot gas tungsten arc welding experiments were designed and conducted to collect the active vision images in pairs with their actual penetration states measured by a camera that views the backside surface of the workpiece. The CNN architecture was optimized by trying different hyperparameters, including kernel number, kernel size, and node number. The accuracy of the optimized model is about 98% and the cycle time in the personal computer is ~ 0.1 s, which fully meets the required engineering application.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48897313","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: 10

The State of the Art of Underwater Wet Welding Practice: Part 1 水下湿焊实践的现状：第一部分

IF 2.2 3区材料科学

Welding Journal Pub Date : 2021-04-01 DOI: 10.29391/2021.100.011

E. Pessoa, Stephen Liu

{"title":"The State of the Art of Underwater Wet Welding Practice: Part 1","authors":"E. Pessoa, Stephen Liu","doi":"10.29391/2021.100.011","DOIUrl":"https://doi.org/10.29391/2021.100.011","url":null,"abstract":"Developments in underwater wet welding (UWW) over the past four decades are reviewed, with an emphasis on the research that has been conducted in the last ten years. Shielded metal arc welding with rutile-based coated electrodes was established as the most applied process in the practice of wet welding of structural steels in shallow water. The advancements achieved in previous decades had already led to control of the chemical com-position and microstructure of weld metals. Research and development in consumables formulation have led to control of the amount of hydrogen content and the level of weld porosity in the weld metal. The main focus of research and development in the last decade was on weldability of naval and offshore structural steels and acceptance of welding procedures for Class A weld classification according to American Welding Society D3.6, Under-water Welding Code. Applications of strictly controlled welding techniques, including new postweld heat treatment procedures, allowed for the welding of steels with carbon equivalent values greater than 0.40. Classification societies are meticulously scrutinizing wet welding procedures and wet weld properties in structural steels at depths smaller than 30 m prior to qualifying them as Class A capable. Alternate wet welding processes that have been tested in previous decades — such as friction stir welding, dry local habitat, and gas metal arc welding —have not achieved great success as originally claimed. Al-most all of the new UWW process developments in the last decade have focused on the flux cored arc welding (FCAW) process. Part 1 of this paper covers developments in microstructural optimization and weld metal porosity control for UWW. Part 2 discusses the hydrogen pickup mechanism, weld cooling rate control, design, and qualification of consumables. It ends with a description of the advancements in FCAW applications for UWW.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2021-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43757447","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: 9