July 2, 2010, the Mexican Ministry of Economy issued a public notice in the Official Journal, decided to start safeguard investigations spiral welded pipe originating in China and other countries. Tariff lines of products involved is 73,051,901, the product is described as: wall thickness in the following 50.8mm diameter greater than 8 inches, length of 26.82 meters of spiral welded steel pipes, and has API5L certification.
The applicant of the case of Mexico TubESa and TumEX investigation period is from July 1, 2009 to June 30, 2010, data analysis, the period of January 1, 2007 to June 30, 2010, interested parties need to Submit data and reports of the survey period.
Requirements according to the Mexican side case stakeholder respondents and related Welding Electrode Materials and evidence submitted to the Mexican Ministry of Economy international trade practices General shall, prior to August 11, 2010 14:00. Provided by the respondents should be in Spanish, in 4 copies (1 original and 3 copies), points together with public and confidential version of the electronic version of the material. All text Welding Materials do not punch binding, the top of each page and the left side of each set aside 3 cm blank. The material sent to: Mexican Ministry of Economy international trade practices the Administration HugoPerezcanoDiaz Secretary, Address: InsurgenteSur1940 Col.Florida, CP01030, Mexico, the DF
Orbital welding automatic Tunguston inert gas shielded arc welding. It eliminates the chance of manual errors in welding. It produces 100 times, with the e6013 Welding Rod welding precision welds.
The orbital welding is the first time in 1960, when recognized by the aerospace industry aerospace hydraulic lines to join the superior technology?? Needs. One mechanism is the rotation of the developed countries from around the tungsten electrode arc welds. The arc welding current regulation, the entire process automation and control systems. The result is a manual welding method is more accurate and reliable method than it is to replace.
The actual orbital welding in many industries in the early 1980s, a combination of power / control system development, from the 110 volt AC operation, the body is small enough, from one place on the site put more than one place welding.
Modern orbital welding system provides a variety of applications of welding parameters can be stored in memory and called up when needed for the specific application of computer control. The skills of a qualified welder to build a welding system, resulting in the digital space for welding and leave significantly fewer errors or defects.
Orbital welding equipmentIn the orbital welding process, tubes / pipe fastening in place orbital welding head and weld around the electrode and the joint, so that the welding arc rotation. Orbital welding system includes a power supply and an orbital welding head.
Power supply: power supply / control system supplies and control of welding parameters, depending on the Mig Welding Rodprocess from memory to create or review. Power supply control parameters, arc current, the power switch of the welding head drive motor / necessary protective gases (ES).
The welding head: orbital welding head is usually closed, and to provide an inert atmosphere chamber around the weld.
Larger diameter and wall thickness can accommodate open standard closed orbital Welding Alloyshead and welding pipe size from 1/16 in. (1.6 mm), 6 inches, wall thickness up to 0.154 in. (3.9 mm) (152 mm) of the actual style of welding head.
Argon arc welding process physics
The orbital welding process used in gas tungsten arc welding process (GTAW) welding arc melting the matrix material and form of the source. In the argon arc welding process (also known as tungsten inert gas process-of TIG) electric arc established between a tungsten electrode and welding parts. To start the arc, an RF or high voltage signal (usually 3.5 to 7 kV) is used to break the insulating properties of the protective gas (ionization), and a small amount of current through the conductive Capacitance dump one into this electrical path, thereby reducing the level of arc current of the arc voltage power supply. Power requirements, and provide the welding current, in order to maintain the arc to establish. Arc welding metal melting heat and fuse together.
The reasons for using orbital welding equipment
There are reasons for using orbital welding equipment. Ability to make high-quality, consistent welding speed close to the maximum welding speed repeatedly to provide users with many benefits:? Productivity. Orbital welding system?? Better than the manual welders, many times the cost of rail equipment in a single work pay.o quality. Correct welding procedures for orbital welding system to create a welding quality will be better than manual welding. Applications, such as semiconductor or pharmaceutical tube welding, orbital welding the only means to reach the welding quality requirements.O consistency. Once the welding procedures have been established orbital welding system can repeatedly perform the same weld hundreds of times, eliminating the normal variability, inconsistencies, errors, and manual welding defects.Orbital welding, can be used in the tube or pipe welding can not be rotated or rotate the part is not the actual application.Orbital welding, can be used for applications to access space restrictions limit the physical size of the welding equipment. Can be used for the rows of boiler tubes, it will be difficult to manual welder to use a welding torch or view the weld head.o many other reasons, the existence of track equipment use manual welding. Such as internal weld inspection is not for the practical application of each weld created. By a certified sample welding coupons, the logic that, if the sample weld is acceptable, the machine automatically creates a continuous weld with the same input parameters should also be sound.
Orbital welding industry and application
Aerospace: As mentioned earlier, the aerospace industry is the primary industry, recognizing the requirements of orbital welding. The high-pressure system of a single plane can have over 1,500 welded joints, all automatically created with orbital equipment.
Boiler tube installation and maintenance of the boiler tubes to provide a perfect application for orbital welding. The mpact orbital welding head can be manually welder will encounter serious difficulties, repeated welding fastening in place between rows of heat exchanger tube.
Food, dairy and beverage industry: food, dairy and beverage industries need full penetration welded joint weld consistency. Most of these pipes / piping systems are in place for cleaning and disinfection schedule. In order to get the maximum piping system efficiency the tubing must be as smooth as possible. Any pits, cracks, crack or incomplete weld can form a liquid trapped in the tube and form a bacteria harbor.Poor working conditions related specifications and high-quality Welding Electrode of the nuclear industry, nuclear pipeline: long advocated orbital welding.
Marine applications: small sea hydraulic lines use materials temperature changes in the normal course of a welding cycle to change its properties. Hydraulic joints welded with orbital equipment to provide excellent corrosion resistance and mechanical properties.
Pharmaceutical Industry: Pharmaceutical process lines and piping systems to provide high quality water, and their processes. This requires high quality welds to ensure that the tube is by bacteria, rust or other contaminants uncontaminated water. Orbital welding, to ensure full penetration welds, there is no overheating occurred, could undermine the corrosion resistance of the final weld zone.Semiconductor Industry: Semiconductor industry with a very smooth surface finish piping systems to prevent the accumulation of pollutants of the tubing walls or weld joints. Once large enough, particles, water, or pollutant release and destruction of the batch process.
Tube / pipe fittings, valves and regulators: the hydraulic lines, liquid and gas delivery system, we need to pipe connection fittings. The track system provides a means to ensure that the welding of high productivity and improve the welding quality. Sometimes the tubing may be welded in the valve or the regulation of body. Orbital welding head provides the ability to produce high quality welds, the weld with limited access to applications.
Manual weld taken from the operation of factories.
This weld defects, including lack of penetration, not a huge crevice, and discoloration due to a bad number to clear. This weld would be considered unacceptable by any standard to measure.