Flat welding flange refers to a kind of flange connected with vessel or pipeline by fillet weld. It belongs to any flange. According to the integrity of the connection between the flange ring and the straight cylinder section, the design shall be checked according to the integral or loose flange respectively. There are two kinds of flange rings with neck and without neck. Compared with the neck butt welding flange, the flat welding flange has simple structure and saves materials, but its stiffness and tightness are not as good as the neck butt welding flange. Flat welding flange is widely used in the connection of medium and low pressure vessels and pipelines. Slip-On Weld Flange,Flat Welded Plate Flange,Flat Forged Plate Flange,Carbon Steel Plate Flange Jiangsu Jinye Titanium Co., Ltd , https://www.metalhose-gasket.com
Recently, chip faucets including Sanan Optoelectronics and Huacan Optoelectronics have begun to deploy 2-inch to 4-inch epitaxial chips. According to industry insiders, 4-inch epitaxial chips are the trend.
Recently, San Xue Optoelectronics Secretary-General Li Xuehong told the agency that the company completed the 2-inch to 4-inch film in 2013 with a percentage of 30, and strived to reach 70 or more in 2014. Huacan Optoelectronics said in a joint investigation by the agency that the company's planned chips are all 4 inches. The first phase of the planned addition of MOCVD 48 is more than two-thirds. The remaining MOCVD is expected to arrive in the first half of 2014. And installed and put into production.
For the cost of the 4-inch chip will be reduced, Sanan Optoelectronics Secretary Li Xuechan believes that if the yield of 2 inch film and 4 inch film is the same, the cost of 4 inch film is 20-30 lower than the cost price of 2 inch film. .
Huacan Optoelectronics said that in the production of 4-inch wafers, there are fewer problems with epitaxial segments, and some technical problems in the chip part still need to be overcome. For example, in the lithography and thinning process, the epitaxial warpage will cause many related problems. In the previous year, a lot of 4-inch chip special research and development and process improvement have been made in the Wuhan plant area. At present, there are already mature solutions, and the 4-inch production line of the Zhangjiagang plant has been mass-produced smoothly.
According to industry insiders, since the 4-inch sapphire substrate needs to be imported, the price is relatively expensive. At present, the domestic 2-inch film is the main one, but the 4-inch epitaxial chip is the development trend.