Location History:
- Chiba, JP (1993)
- Ibaragi, JP (2000 - 2001)
- Ibaraki, JP (2003)
- Tsukuba, JP (2008)
Company Filing History:
3 out of 1,256 
1 out of 549 
1 out of 832,718 Years Active: 1993-2008
Title: Chiaki Shiga: Innovator in Welding Technology
Introduction
Chiaki Shiga is a prominent inventor based in Tsukuba, Japan. She has made significant contributions to the field of welding technology, holding a total of 5 patents. Her innovative work focuses on improving welding materials and methods, showcasing her expertise and dedication to advancing industrial processes.
Latest Patents
One of Chiaki Shiga's latest patents is related to a welding material and a method of producing a welded joint. This invention utilizes an iron-based alloy that contains by mass %: 0.20% or less of carbon; 6.0 to 16.0% of chromium; and 6.0 to 16.0% of nickel. The alloy's martensitic transformation starting temperature (Ms point temperature) is designed to be in the range of 0-170°C, inclusive of 0°C and exclusive of 170°C. Additionally, the weld metal has a composition that includes 0.20% or less of carbon; 3.0 to 13.0% of chromium; and 3.0 to 13.0% of nickel, with a martensitic transformation starting temperature ranging from 50-360°C.
Another notable patent involves a consumable electrode gas shielded arc welding method and apparatus. In this invention, a gas with an arc current-voltage property different from that of the shielding gas is intermittently added. The arc current is adjusted in proportion to the chemical composition changes of the shielding gas at the arc generation region, allowing for precise control of the welding process.
Career Highlights
Chiaki Shiga has worked with notable companies, including Kawasaki Steel Corporation. Her experience in these organizations has allowed her to refine her skills and contribute to significant advancements in welding technology.
Collaborations
Throughout her career, Chiaki has collaborated with esteemed colleagues such as Akihiko Ohta and Osamu Watanabe. These partnerships have fostered innovation and have been instrumental in her research and development efforts.
Conclusion
Chiaki Shiga's contributions to welding technology through her patents and collaborations highlight her as a leading inventor in her field. Her work continues to influence the industry and pave the way for future innovations.