Journal of Welding and Joining最新文献

Solder Joint Degradation and Electrochemical Metallic Ion Migration Property of Solder Joints with Surface Finish 表面光洁度下焊点劣化及电化学金属离子迁移性能

Journal of Welding and Joining Pub Date : 2023-08-31 DOI: 10.5781/jwj.2023.41.4.5

Hye Min Lee, Mi-Song Kim, Won Sik Hong

{"title":"Solder Joint Degradation and Electrochemical Metallic Ion Migration Property of Solder Joints with Surface Finish","authors":"Hye Min Lee, Mi-Song Kim, Won Sik Hong","doi":"10.5781/jwj.2023.41.4.5","DOIUrl":"https://doi.org/10.5781/jwj.2023.41.4.5","url":null,"abstract":"To confirm the degradation property of solder joints by substrate surface finish, chip resistors are reflow soldered to organic solderability preservative (OSP) and electroless nickel immersion gold (ENIG) finish substrate in a nitrogen atmosphere using the type 6 Sn-3.0Ag-0.5Cu (SAC305) solder paste. To confirm the electrochemical metallic ion migration (ECM) sensitivity with and without photo solder resist (PSR) ink-coated printed circuit board (PCB), comb patterned test vehicles were prepared by the hot air reflow soldering process in nitrogen atmosphere, and the SAC305 solder paste was printed on the conductor of the ECM test PCB. The ECM test was conducted under high temperature and high humidity conditions of 85℃ and 85% RH, respectively. As a result of measuring the void content of the 2012 chip resistor, the average void content of the OSP substrate was higher than that of the ENIG substrate. The thermal shock test (TST) indicated that the degradation rate of the OSP substrate was higher than that of the ENIG substrate. Microstructure analysis showed that the OSP substrate had more crack propagation and thicker intermetallic compound (IMC) thickness than the ENIG substrate. The ECM test revealed that the substrate with PSR-coated PCB coupon generated more dendrites than that without PSR-coated coupon. Because the PSR coated substrate decreased the moisture absorption into the substrate, moredendritesweredeterminedtobe generated.","PeriodicalId":253691,"journal":{"name":"Journal of Welding and Joining","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127500408","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

Solidification Crack Free Welding Strategy via Ultra High Precision Laser Scanning at a Single Grain of Directionally Solidified and Single Crystal Superalloys 定向凝固和单晶高温合金单晶超高精密激光扫描凝固无裂纹焊接策略

Journal of Welding and Joining Pub Date : 2023-08-31 DOI: 10.5781/jwj.2023.41.4.4

Seong-Jin Lee, Kyeong-Min Kim, Heeshin Kang, Seong-Moon Seo, Wonah Park, Eun-Joon Chun

{"title":"Solidification Crack Free Welding Strategy via Ultra High Precision Laser Scanning at a Single Grain of Directionally Solidified and Single Crystal Superalloys","authors":"Seong-Jin Lee, Kyeong-Min Kim, Heeshin Kang, Seong-Moon Seo, Wonah Park, Eun-Joon Chun","doi":"10.5781/jwj.2023.41.4.4","DOIUrl":"https://doi.org/10.5781/jwj.2023.41.4.4","url":null,"abstract":"In this study, possibility of solidification crack-free welding of directionally solidified CM247LC and single crystal CMSX-4 superalloys was metallurgically investigated using single-mode fiber laser scanning. The key metallurgical factors of solidification cracking have been identified as the formation of highly misoriented solidification grain boundaries (low level of epitaxial growth behavior) at the fusion zone that affects the repulsive force between two adjacent dendrites and dendrite coalescence undercooling at the terminal stage of weld solidification. In particular, under extremely low heat input and ultra-high-speed laser beam scan conditions (welding speed: 1,000 mm/s, heat input: 2 J/mm, and energy density: 65 J/mm2), an effective fusion zone could be achieved within a single directionally solidified grain of CM247LC alloy owing to the characteristics of single-mode fiber laser. The fusion zone successfully showed a 99.9% of epitaxial growth achievement ratio (that is, low fraction of highly misoriented solidification grain boundaries at the fusion zone) without solidification cracking. Based on these results on CM247LC alloy, solidification crack-free welds could be successfully achieved using quadruple-pass and square-type weld geometries.","PeriodicalId":253691,"journal":{"name":"Journal of Welding and Joining","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128823376","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

An Experimental Study on Welding Distortion in High-Density Polyethylene (HDPE) Welded Structures 高密度聚乙烯(HDPE)焊接结构焊接变形的实验研究

Journal of Welding and Joining Pub Date : 2023-08-31 DOI: 10.5781/jwj.2023.41.4.2

Suji Kang, Jaemin Lee

引用次数: 0

Interfacial Properties of Sn-Cu-xCr Alloy using Laser-Assisted Bonding 激光辅助键合Sn-Cu-xCr合金的界面性能

Journal of Welding and Joining Pub Date : 2023-08-31 DOI: 10.5781/jwj.2023.41.4.8

Shin-Il Kim, Dong-Yurl Yu, Yun-Chan Kim, Junhyuk Son, Dongjin Byun, Junghwan Bang

引用次数: 0

Study on Characteristics of Through-Thickness Crack When Cryogenic Materials are Applied to Independent B Type Tank 低温材料应用于独立B型储罐时透厚裂纹特性的研究

Journal of Welding and Joining Pub Date : 2023-08-31 DOI: 10.5781/jwj.2023.41.4.1

Seong-gu Kang

{"title":"Study on Characteristics of Through-Thickness Crack When Cryogenic Materials are Applied to Independent B Type Tank","authors":"Seong-gu Kang","doi":"10.5781/jwj.2023.41.4.1","DOIUrl":"https://doi.org/10.5781/jwj.2023.41.4.1","url":null,"abstract":"Due to climate change, interest in eco-friendly energy is continuously increasing around the world. LNG is an intermediate energy source and its use increases continuously because of its established infrastructure. LNG temperature is -165°C and requires low temperature toughness of tank material. High manganese austenitic steel has similar mechanical properties to cryogenic material for LNG listed in IGC and IGF code. High manganese austenitic steel easily satisfies the low temperature toughness required at cryogenic temperature and shows superior performance in yield strength, tensile strength and elongation, compared to existing materials in IGC and IGF code.In this study, the thickness ratio is reviewed while loading the same LNG fuel. Based on the thickness ratio, the thickness for 9%Ni steel, STS304 and Al5083 is calculated for two standard thickness of 10 mm and 20 mm for the high manganese austenitic steel. 9%Ni steel, STS304, Al5083 and high manganese austenitic steel are compared and reviewed from the viewpoint of the required time for initial surface cracks to grow into through-thickness cracks and the size of through-thickness cracks under the same amount of LNG fuel. The effect of different thickness, welded joint and stress sequence on through-thickness cracks are investigated.","PeriodicalId":253691,"journal":{"name":"Journal of Welding and Joining","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126190926","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

A Variance Analysis on the Porosity Distribution of Laser Welded A365 Casting with a Dual Beam Laser Under Various Oscillation Conditions 双光束激光焊接A365铸件在不同振荡条件下气孔分布的方差分析

Journal of Welding and Joining Pub Date : 2023-08-31 DOI: 10.5781/jwj.2023.41.4.6

Hyeonhee Kim, Yong Hoon Jang, Minjung Kang

引用次数: 0

Development of an Arc Image Classification Algorithm in Tip-Rotating Arc Welding using Camera Image Monitoring and Deep Learning 基于摄像机图像监测和深度学习的尖端旋转弧焊电弧图像分类算法研究

Journal of Welding and Joining Pub Date : 2023-08-31 DOI: 10.5781/jwj.2023.41.4.9

Sol Mi Lee, Y. Park

引用次数: 0

A Study on the Efficient Method of Underwater Welding Education for Commercial Diver 商业潜水员水下焊接有效教育方法研究

Journal of Welding and Joining Pub Date : 2023-08-31 DOI: 10.5781/jwj.2023.41.4.7

Sangwon Park, Eyi-Jin Jung, Han-Sam Yoon

{"title":"A Study on the Efficient Method of Underwater Welding Education for Commercial Diver","authors":"Sangwon Park, Eyi-Jin Jung, Han-Sam Yoon","doi":"10.5781/jwj.2023.41.4.7","DOIUrl":"https://doi.org/10.5781/jwj.2023.41.4.7","url":null,"abstract":"Although the requirements of underwater welding has been increasing in the marine field, limited studies have been conducted on the systematic approaches for underwater welding education. The present study was conducted to provide baseline data to understand the educational underwater welding process for commercial diving candidates. For this, optimal welding parameters for underwater were configured, experimental welding dives were conducted, and weld coupons were inspected and analyzed.The results of this study can be summarized as follows respective weld passes. In the root pass, the insufficient weld deposit sizes owing to the fast weld speed were the main defects. In the second pass, non-paralleled beads and insufficient weld convexity were the main defects. In the third pass, incomplete deposit between the beads and the unplaned weld surface were the main defects. Finally, macro-etching test revealed incomplete penetration, slag inclusion, undersize of weld and unplaned weld profile.The aforementioned weld defects must be reduced for beginner welder divers, selecting welding parameters such as suitable amperage, accurate work angle, and weld speed as the main variables.","PeriodicalId":253691,"journal":{"name":"Journal of Welding and Joining","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129338672","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

A Study on Changes of Bead Shape and Metal Transfer Mode Affected by Molten Pool Behavior for Welding Position in GMAW Process GMAW焊位熔池行为对焊头形状及金属传递方式影响的研究

Journal of Welding and Joining Pub Date : 2023-08-31 DOI: 10.5781/jwj.2023.41.4.3

Sang-Hyun Ahn, Jun Sun Bae, Dae-Won Cho, Dae-Hwan Kim, Seung-Hoon Bae, Seonmin Kim, Jinhoon Kang, Tae-Kook Park, Chang Woo Park, Jung Goo Park, Doo Jin Choi

{"title":"A Study on Changes of Bead Shape and Metal Transfer Mode Affected by Molten Pool Behavior for Welding Position in GMAW Process","authors":"Sang-Hyun Ahn, Jun Sun Bae, Dae-Won Cho, Dae-Hwan Kim, Seung-Hoon Bae, Seonmin Kim, Jinhoon Kang, Tae-Kook Park, Chang Woo Park, Jung Goo Park, Doo Jin Choi","doi":"10.5781/jwj.2023.41.4.3","DOIUrl":"https://doi.org/10.5781/jwj.2023.41.4.3","url":null,"abstract":"In gas metal arc welding, the molten pool is affected by gravity and this affects welding phenomena. This study investigated the changes in bead shape and metal transfer mode caused by the molten-pool behavior. We conducted gas metal arc welding with various welding positions. Images from high-speed camera and signals from current and voltage sensors were used to determine the differences with welding positions. Bead shapes were quantified through transverse cross-sectional bead images and image processing. Molten-pool images from the camera were analyzed through the molten-pool length and distance from the wire position. These were used to explain the differences between transverse and longitudinal cross-sectional bead images with welding positions. Changes in metal transfer based on current and voltage signals were investigated. To determine the exact change in metal transfer, the number of short-circuit transfers and spray transfers within the same time was captured by the welding position camera.","PeriodicalId":253691,"journal":{"name":"Journal of Welding and Joining","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126190816","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

A Study on the Optimization of Welding Parameters for Titanium Drums Using Optimization Algorithms 基于优化算法的钛鼓焊接参数优化研究

Journal of Welding and Joining Pub Date : 2023-06-30 DOI: 10.5781/jwj.2023.41.3.7

Won-Bin Oh, Bo-Ram Lee, B. Kang, J. Shim, Gi-Hoon Lee, Ill-Soo Kim

引用次数: 0