At present, Weichai has successively put into production several WP10, WP12, WP7 and other diesel engines that meet the National 3rd and 4th national emission standards. For the implementation of the National IV emission standard, Weichai made it clear that the company will use electronically controlled high pressure common rail technology as its only four-phase technology solution. According to Tan Zhichao, Director of Product Planning of Weichai Power Co., Ltd., since 2006, Weichai has invested heavily in the research and development of Guosi. According to reports, Weichai's National IV product plan includes four to 13 liters of product lines. Among them, the newly expanded products include 135 to 165 horsepower for the WP4E40 series, 180 to 245 horsepower for the WP6E40 series, 350 horsepower for the WP10E40 (4V) series, 270 to 375 horsepower for the WP10E41 series, and 350 to 375 horsepower for the WP10E41 (4V). 336 to 480 horsepower for the WP12E41 (4V) series and 480 to 550 horsepower for the WP13E40 (4V) series. At present, there are already 11 families of 63 countries and four aircrafts, and 2 families of 10 countries and five aircrafts have entered the engine bank. The Weichai National IV engine adopts a high-pressure common rail plus SCR line. The National IV announcement has covered all power segments and product series of the third country, and production preparations have been completed. Tan Zhichao also pointed out that Weichai has completed related training in the areas surrounding Jinan, Beijing, Xi’an, and Shenzhen in the promotion of the national IV product and is currently undergoing training in Shanghai and Kunming. The main contents of the training include an overview of the SCR system, a urea tank, and a urea pump. , nozzles, SCR box, heating system, ambient temperature sensor and temperature sensors and other components of the specific introduction and troubleshooting case study and post-processing knowledge development. In addition, the company completed the on-site support for Shaanqi, Foton's in-plant technology, workshop training, and Shanxi Auto's export of 1,500 orders from Russia. The implementation of the National IV emission standard will certainly bring about an upgrade of the after-sales service system. According to Tan Zhichao, Weichai currently has 1,826 service stations in China. Weichai will carry out skills training and upgrading of these service stations to meet the requirements of the national IV diesel engine after-sales service.
The seamless steel pipe is made by perforating the whole round steel, and the steel pipe without weld seam on the surface. It is mainly used as high-precision structural steel pipes for petrochemical industry, boiler pipes, automobiles and aviation.
Seamless tubing can be made from any of several alloys and metals, such as carbon steel, stainless steel, molybdenum, or tungsten. Seamless pipes are used in those industrial applications that require the highest safety requirements. To produce seamless steel pipes, the solid block is pierced with a piercing plug before the pipe is drawn to the desired size.
Some of the differences between seamless and welded pipes are:
Seamless pipes are extruded and drawn from billets, while welded pipes are produced from roll formed and welded strips.
Due to the higher range of security offered by seamless pipe, it is more expensive than welded pipe.
Seamless pipes are available in relatively short lengths, while welded pipes can be manufactured in longer continuous lengths.
Seamless pipe generally does not show any signs of corrosion until and unless it is subjected to a highly corrosive environment, whereas in welded pipe the welded area is more susceptible to corrosion attack.
The welded area is considered to be inhomogeneous, so it exhibits different ductility and lower corrosion resistance, as well as larger dimensional changes. Seamless pipes eliminate any such problems and thus offer high corrosion resistance.
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