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(Reporter Zhou Yimei ) June 14 , a teacher of Beijing Foreign Studies University cooperation projects in South Africa in the World Cup encounter robbery when , fortunately, not physical harm . Reporter learned yesterday from the school , the teacher 's loss is not serious , he led the 10 North team of foreign students to interview World Cup in South Africa , this is the first branch abroad college students reported that the World Cup training team , this incident Does not affect the conduct of practical projects .

14 evening Beijing time ( Johannesburg time 14 noon) , the teachers involved in the exchange program to go alone to Mr. Wang in a toilet on the ground floor ,男子喝雪碧遭情人投毒 为掩盖关系向警方撒谎,vibram kso, armed with knives robbed by two local blacks .

peer network for all students Lu Li issued the message: Denmark and the Netherlands match ,vibram sale, so you Do not worry .

teachers and students outside the North has expressed concern about this online , Sun has introduced Dean , invited by the University of the Witwatersrand ,Vibram 5 Fingers, South Africa , Beijing Foreign Studies University, led by two teachers 10 school students participated in the World Cup co-operation projects, reported the World Cup exit . As an understanding of law and order in South Africa prior to departure , college teachers and students devoted to this line of preventive training, developed a plan of measures and require each individual discipline, security and defense agreements signed ,3 men gang-raped female net towed away a maximum s,five finger shoes, requiring that they do not go out alone.

After the incident , the college immediately by phone and EMAIL with the link teachers and students in South Africa , Because this line has with the host University , have written laboratories provide news , safety should be more secure , and teachers was also traveling light , and robbed the amount is not large,vibram 5 fingers sale, internships will be planned.

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CO 2 gas shielded arc welding is the use of CO 2 as a protective gas arc welding method of melting. This approach to CO 2 gas as a protective medium, so that the air around the arc and weld pool and isolation, to prevent air, oxygen, nitrogen and hydrogen on the metal droplet and the pool of harmful substances, resulting in excellent mechanical protection. The production to the use of special welding torch, enough CO 2 to form protective layer of gas, relying on pieces of wire and welding arc between the heat, automatic or semi-automatic MIG welding.
?????? early 30's in the 20th century, someone proposed using CO 2 and water vapor as a protective gas, but the test results showed that severe oxidation of the weld metal, a lot of holes, welding quality can not be guaranteed. Therefore, argon, helium and other inert gas welding used in welding the first to solve the aviation industry, non-ferrous metals when welding problems, the advantages of gas welding has gradually been recognized and valued. However, argon, helium as the rare gas, the price is expensive, subject to certain restrictions on the application. To this end, to the 20th century, 50 years. It has re-examine the CO 2 gas shielded arc welding, and gradually applied to welding.
?????? argon, helium and other inert gases and metal chemical reaction either not soluble in metals, can play a good protective effect, while CO 2 is an oxidizing gas. Especially under high temperature has a strong oxide, but low-cost CO 2 gas supply is sufficient. Although it has a strong oxidation, but oxidation of the molten metal can be relatively easy to oxygen; but on the other strong oxidizing hydrogen can inhibit the presence of the weld, holes and cracks to prevent the generation of hydrogen; and well-CO 2 protection, but also effectively prevent the droplets in the air and nitrogen on the harmful effects of the metal pool, which is very valuable, because once the metal nitride, it is difficult to make the removal.
?????? CO 2 welding wire diameter by the use of different CO 2 welding can be divided into filaments (wire diameter ≤ 1.6mm) and coarse CO 2 welding wire (wire diameter> 1.6mm). Classified according to the operation mode, can be divided into semi-automatic CO 2 welding and automatic CO 2 welding.
features
????? 1, the advantages
????? 1) welding is high. Current density and the welding arc heat efficiency is higher, and no weld slag,エアマックス, thereby increasing productivity. CO 2 than the average productivity of welding arc welding electrode 2 to 4 times higher.
????? 2) welding and low cost. A wide source of CO 2 gas, cheap,エアマックス パープル, and low power consumption, so the welding cost. Usually the cost of CO 2 welding or submerged arc welding arc welding only 40% to 50%.
????? 3) welding deformation. Concentration due to arc heating,nike air max360, welding pieces of heated area is small, while CO 2 gas has a strong cooling effect, so welding distortion is small, especially suitable for thin plate welding.
????? 4) high quality of welding. Sensitivity of rust is small, less hydrogen welding, good crack resistance.
????? 5) applies to a wide range. To achieve all-position welding, and for sheet, plate or plate can be welded.
????? 6) easy to use. No slag after welding, and is open arc, easy to control, is conducive to mechanization and automation welding.
????? 2,nike air max 97 通販, shortcomings
????? 1) splash rate is high, and the weld surface shape is poor. CO 2 welding metal splash is the more prominent issue, which is the major shortcomings.
????? 2) AC power is difficult to weld,Decade (b) the left hand side of the secret - Qzone log, welding equipment is more complex.
????? 3) bad wind resistance, to bring some outdoor work difficult.
????? 4) can not be welded easily oxidized non-ferrous metals.
????? CO 2 welding defects can be improved by improving the technology and welding materials,亚洲销售女神徐鹤宁经典语录――太过精辟，不学必悔,エアマックス95　ブルー,Gathered to watch ########ographic videos (eighth forbidden)! - Qzone log, welding equipment to be addressed, and its a little bit but other welding methods can not compare. Thus, that CO 2 welding is a high efficiency, low cost energy welding methods.
application
????? CO 2 welding is mainly used for welding low carbon steel and low alloy steel and other ferrous metals. For stainless steel,エアマックスプラス360, the carbon weld metal has the phenomenon of resistance to intergranular corrosion. Therefore, the performance can only be used for less demanding weld stainless steel weldments. In addition, CO 2 can be used for wear parts weld surfacing, welding of steel castings, and electrical welding and so on. CO 2 welding current has been in the automotive, motorcycle and vehicle manufacturing, chemical machinery, agricultural machinery, mining machinery and other departments have been widely used.