The Influence Of Procession Technology And Welding Craftwork On Organization And Performance For The Rectangle Pipe

With the development of the roll formed shape,the roll formed shape assembly is widely used in many projects. From airports to major shopping centers, form offices to stadiums, from conference centres to housings, many of the building materials make use of them. With the appearance of the large-caliber bend square and rectangular pipe, the place of this kind of pipes is more and more important.Due to the complexity of the cold bending processing, the mechanical property and structure property is difficult to control. So we often improve technological parameters after the examination of the finished goods to meet the needs. For the sealing, the toughness of the pipes reduces, and with the crackle of the weld, the product percent of pass is too low.To improve the product percent of pass, the experiments base on the filed tests and lab tests. By the tests, finding out the influences of the procession technology and welding craftwork on organization and performances for the rectangle pipe. On the experiments at the molding process, the products'are 250*250*9.2 and 200*300*9.2 ,Q345B; at the welding process, the products'are 250*250*9.75 and 200*300*11.8 ,Q235B The molding process is 15 steps, and the welding procedure is high frequency welding. By all the tests, we find out a suitable technics: V-angle is 4°-6.13°, the power of the side is 0.35～0.4KJ/mm~2;V-angle is2°-4°,the power of the side is 0.2～0.22KJ/mm~2.