Welding Journal最新文献_第10页

Characteristics of Arc and Metal Transfer in Pulsed Ultrasonic-Assisted GMAW 脉冲超声辅助GMAW电弧和金属传递特性

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-07-01 DOI: 10.29391/2020.99.019

Chao Chen, C. Fan, X. Cai, Zeng Liu, Sanbao Lin, Chunli Yang

引用次数: 4

Method and Criteria to Evaluate Reheat Cracking Susceptibility 评价再热开裂敏感性的方法和标准

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-06-01 DOI: 10.29391/2020.99.017

Li Zhang, Kai Wang, Yu Huang, Chi Xu, Jin Chen

引用次数: 0

Ultrasonic-Driven Spreading of Liquid Solder on Nonwetting Substrates 液体焊料在非润湿基板上的超声驱动扩散

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-06-01 DOI: 10.29391/2020.99.016

Zhiwu Xu, Zhengwei Li, Lin Ma, Bo Junlan, Jiuchun Yan

引用次数: 4

Effect of Galvannealed Coating Evolution during Press Hardening on RSW Weldability 压淬过程中电镀层演变对RSW可焊性的影响

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-05-01 DOI: 10.29391/2020.99.015

Xu Han, M. H. Razmpoosh, E. Biro, Y. Zhou, A. Macwan

{"title":"Effect of Galvannealed Coating Evolution during Press Hardening on RSW Weldability","authors":"Xu Han, M. H. Razmpoosh, E. Biro, Y. Zhou, A. Macwan","doi":"10.29391/2020.99.015","DOIUrl":"https://doi.org/10.29391/2020.99.015","url":null,"abstract":"Press-hardening steels (PHSs) are used in modern passenger vehicles to increase part strength while reducing vehicle weight to meet both environmental and safety regulations. To prevent oxidization and decarburization during heat treatment, some PHSs are coated with Zn (galvanized or galvannealed). Heating during the press-hardening process drives interdiffusion of Zn from the coating and the Fe from the steel substrate, forming a diffusion layer composed of -Fe phase (a Zn-Fe solid solution). The electrical resistance of the diffusion layer is a function of its thickness and Zn-Fe composition. Both the diffusion layer thickness and the Zn-Fe composition are dependent on the initial coating thickness and heat-treatment time/temperature conditions. Changes to the heat-treatment process shift the resistance spot welding process window by altering the resistance behavior of the material. If the shift in the process window is not accounted for during assembly welding, the welds produced may either be too small or exhibit expulsion, both of which will reduce the strength of the weld. This study showed increasing heattreatment time shifted the process window toward lower current. A final combined processing window of 1.5 kA, which is suitable for industrial application, was obtained when taking into account the variation in heat-treatment time. The tensile shear performance was not affected by the heat treatment, as increased softening in the heat-affected zone at longer heat-treatment time canceled the strength gain from increas-","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44130666","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

Underwater Pulse-Current FCAW - Part 1: Waveform and Process Features 水下脉冲电流FCAW第1部分：波形和工艺特征

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-05-01 DOI: 10.29391/2020.99.013

C. Jia, Junfei Wu, Yanfei Han, Yong Zhang, Qingyuan Yang, Chuansong Wu

引用次数: 6

Interactive Phenomena in Hybrid KPAW–GMAW-P KPAW-GMAW-P混合焊中的相互作用现象

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-05-01 DOI: 10.29391/2020.99.014

Dongsheng Wu, S. Tashiro, Ziang Wu, Manabu Tanaka, K. Nomura, Xueming Hua

引用次数: 4

Enhanced Penetration Depth during Reduced Pressure Keyhole-Mode Laser Welding 减压键孔模式激光焊接熔深的提高

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-04-01 DOI: 10.29391/2020.99.011

M. Jiang, T. DebRoy, Y. Chen, X. Chen, W. Tao

{"title":"Enhanced Penetration Depth during Reduced Pressure Keyhole-Mode Laser Welding","authors":"M. Jiang, T. DebRoy, Y. Chen, X. Chen, W. Tao","doi":"10.29391/2020.99.011","DOIUrl":"https://doi.org/10.29391/2020.99.011","url":null,"abstract":"Keyhole-mode laser welding under reduced ambient pressure is known to provide improved weld penetration, narrower width, and reduced incidences of defects, but the underlying mechanism for these benefits is not known. We sought to elucidate the mechanism by an experimental and theoretical program of investigation. Potential causative factors, such as the depression of the boiling point of al-loys at reduced pressures and the changes in laser beam attenuation by metal vapors/plasma, were investigated using a well-tested heat transfer and fluid flow model of keyhole-mode laser welding for various ambient pressures. The model was tested with experimental data for the weld-ing of four alloys — Structural Steel Q690, Aluminum Alloy A5083, commercially pure titanium, and Nickel 201 — that have very different thermophysical properties. The results showed the changes in the boiling point alone were unable to explain the enhanced depth of penetration at low ambi-ent pressures. The experimental and calculated fusion zone geometries showed excellent agreement when both the boiling point depression and the beam attenuation by metal vapor were considered. The reduction of ambient pressure also affected the heat transfer pattern near the keyhole, owing to a decrease in the keyhole wall temperature and changes in the temperature gradient near the keyhole wall.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46404105","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: 20

Control of Weld Residual Stress in a Thin Steel Plate through Low Transformation Temperature Welding Consumables 利用低温焊材控制薄板焊缝残余应力

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-04-01 DOI: 10.29391/2020.99.012

Xin Wu, Zhifen Wang, Zhenzhen Yu, Stephen Liu, J. Bunn, L. Kolbus, Zhili Feng

{"title":"Control of Weld Residual Stress in a Thin Steel Plate through Low Transformation Temperature Welding Consumables","authors":"Xin Wu, Zhifen Wang, Zhenzhen Yu, Stephen Liu, J. Bunn, L. Kolbus, Zhili Feng","doi":"10.29391/2020.99.012","DOIUrl":"https://doi.org/10.29391/2020.99.012","url":null,"abstract":"Low transformation temperature welding (LTTW) consumables are characterized by a low martensite start temperature and a large fraction of martensite forming in the weld. It can efficiently reduce the tensile residual stress because the volume expansion associated with the martensitic transformation compensates for the thermal contraction during cooling. In this work, a LTTW wire, designated as EH200B, was created for the arc welding of advanced high-strength steel thin plates. In comparison to conventional ER70S-3 wires, this LTTW wire generated an opposite distortion pattern. Neutron diffraction measurements along the center thickness of the welded plates showed the maximum residual stress along the longitudinal direction (LD) in the weld region, and the heat-affected zone (HAZ) immediately adjacent to the weld region was reduced from ~330 MPa to below 240 MPa by using the LTTW wire. A finite element (FE) model was developed to predict the residual stress distributions of the plates welded under these two wires. The simulation results showed reasonable agreement with the volume-average neutron diffraction data. Compressive residual stress in the weld region using the LTTW wire was predicted by the FE method. Electron backscattered diffraction and x-ray diffraction measurements confirmed ~90% martensite was present in the LTTW weld. The fatigue life of DP980 steel lap joint panels using EH200B wire nearly doubled that of ER70S-3 wire. This improvement was attributed to the high strength and low LD residual stress in the weld and HAZ immediately ad-","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44657957","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

Evaluation of Hydrogen-Assisted Cracking Susceptibility in Grade T24 Steel T24钢氢辅助开裂敏感性的评价

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-04-01 DOI: 10.29391/2020.99.010

Xiuli Feng, J. Steiner, B. Alexandrov, J. Lippold

引用次数: 0

Laser-Driven Programmable Metal Transfer in GMAW GMAW激光驱动可编程金属转移

IF 2.2 3区材料科学

Welding Journal Pub Date : 2020-03-01 DOI: 10.29391/2020.99.009

Shujun Chen, Jia Yazhou, Hu Wenhao, Jun Xiao

{"title":"Laser-Driven Programmable Metal Transfer in GMAW","authors":"Shujun Chen, Jia Yazhou, Hu Wenhao, Jun Xiao","doi":"10.29391/2020.99.009","DOIUrl":"https://doi.org/10.29391/2020.99.009","url":null,"abstract":"Conventional pulsed laser-enhanced gas metal arc welding (GMAW) employs a single fiber laser focused and aimed on the droplet neck position to produce a laser recoil force and thus ensure the droplet detachment despite the amperage of the welding current. One drop per laser pulse metal transfer is obtained, and the droplet deflects away from the wire axis along the laser incident direction. This implies that the droplet trajectory may also be controlled if the direction of the laser recoil force can be adjusted. Such a controllability is expected to bring an entirely new capability to the GMAW process: active control on the weld beam geometry. To this end, double-sided, laser-enhanced GMAW was proposed and experimentally verified in this paper. The two lasers were symmetrically positioned, and both aimed at the droplet neck. The laser pulse peak power, duration, and pulse phase of the two lasers can all be programmed to regulate the laser recoil forces. The metal transfer under twin laser irradiations (same laser pulses and phases) was first verified. Then the effectiveness on controlling the droplet trajectory of three proposed control strategies — peak power matching, peak width matching, and phase matching of the two lasers — were evaluated. The results showed laser peak power matching is optimal for obtaining desired droplet trajectory. Since the laser can be easily controlled in real time, the transfer frequency, droplet size, and trajectory can all be adjusted in real time, and the metal transfer evolves into programmable transfer.","PeriodicalId":23681,"journal":{"name":"Welding Journal","volume":" ","pages":""},"PeriodicalIF":2.2,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41868638","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