8 research outputs found
Effect of Weld Line Direction on Tensile Deformation Behavior —Development of Forming Technology for Tailor-Welded Blank Application 2nd Report—
Microstructure control of medium carbon steel joints by low-temperature linear friction welding
Single-incision laparoscopic surgery for intestinal intussusception due to neuroendocrine tumor
Abstract Background Small intestinal neuroendocrine tumor (NET) is uncommon, but intestinal intussusception caused by NET is even rare. We report a rare case of single-incision laparoscopic surgery (SILS) for intestinal intussusception due to NET G1. Case presentation A 72-year-old woman presented with vomiting, diarrhea, and abdominal pain. Contrast-enhanced computed tomography (CT) revealed the target sign in the ascending colon. An enhanced nodule was detected at the lead point, leading us to suspect a tumor. Colonoscopy showed a tumor at the lead point of the intestinal intussusception. Histological findings led to a diagnosis of NET G1. Single-incision laparoscopic ileocecal resection with regional lymphadenectomy was then performed. The patient was discharged 10 days postoperatively with no complications. Conclusion We achieved SILS with regional lymphadenectomy for preoperatively diagnosed intestinal intussusception due to NET G1. Although this condition is rare, surgeons should take this possibility into consideration in cases showing similar findings
異強度板組の抵抗スポット溶接継手の引張せん断強さと破断位置に及ぼす材料強度の影響
Advanced high strength steel sheet (AHSS) is widely used in the automotive body for weight reduction and the improvement of crash performance. In general, weldability and formability of steel sheet tends to decline as steel strength increases. Hot stamping is a technique that achieves both formability and strength of steel sheet, and TS1500MPa class hot stamped steel sheet is applied to many vehicle models. On the other hand, since the joint strength characteristics of the spot weld are dominated by the melt-solidified zone and weld heat affected zone, there is a concern that performance of spot welded joints will decline as steel strength increases. In other words, in order to further expand the application of AHSS, it is very important to have knowledge about the characteristics of spot welded joints. In this report, we investigated the TSS of the TS1500MPa class hot stamped steel sheet, focusing on the characteristics of tensile shear joints. Then, we compared the joint strength and failure position of the same kind material joints and the dissimilar material joints with the TS1500MPa class hot stamped steel sheet in case of the plug failure. As a result, it was found that TSS of dissimilar material joints depend on base metal strength on lower strength steel side. However, fracture occurred on the TS1500MPa class hot stamped steel side except for joints with large difference of base metal strength. The mechanism is thought that the effect of strain concentration at the edge of nugget on the TS1500MPa class hot stamped steel side due to the increase of rotational deformation around the nugget
Effect of strength of steel sheets on tensile shear strength and failure mode of dissimilar joint of spot welds
Advanced high strength steel sheet (AHSS) is widely used in the automotive body for weight reduction and the improvement of crash performance. In general, weldability and formability of steel sheet tends to decline as steel strength increases. Hot stamping is a technique that achieves both formability and strength of steel sheet, and TS1500MPa class hot stamped steel sheet is applied to many vehicle models. On the other hand, since the joint strength characteristics of the spot weld are dominated by the melt-solidified zone and weld heat affected zone, there is a concern that performance of spot welded joints will decline as steel strength increases. In other words, in order to further expand the application of AHSS, it is very important to have knowledge about the characteristics of spot welded joints. In this report, we investigated the TSS of the TS1500MPa class hot stamped steel sheet, focusing on the characteristics of tensile shear joints. Then, we compared the joint strength and failure position of the same kind material joints and the dissimilar material joints with the TS1500MPa class hot stamped steel sheet in case of the plug failure. As a result, it was found that TSS of dissimilar material joints depend on base metal strength on lower strength steel side. However, fracture occurred on the TS1500MPa class hot stamped steel side except for joints with large difference of base metal strength. The mechanism is thought that the effect of strain concentration at the edge of nugget on the TS1500MPa class hot stamped steel side due to the increase of rotational deformation around the nugget.『溶接学会論文集』第40巻第4号掲載(2022年 溶接学会発行)の「異強度板組の抵抗スポット溶接継手の引張せん断強さと破断位置に及ぼす材料強度の影響」の英語