钢结构焊接施工应注意的问题（Problems needing attention in welding construction of steel structure）.doc

钢结构焊接施工应注意的问题（Problems needing attention in welding construction of steel structure） Problems needing attention in welding construction of steel structure Abstract: the welding of steel performance requirements, welding material and base metal, welding on the operating environment of the requirements of welding production and assembly requirements, should pay attention to the welding procedure qualification, attention should be paid to the control before welding and welding process and welding postprocessing, discusses some problems in the application of welded steel structure the attention in the welding of steel structure should be. Key words: steel structure; welding; construction problem CLC number: F403.7, document identification code: A Article number: 1004-4914 (2008) 11-289-01 With the development of the national economy, the steel structure has gradually got rid of the shortcomings of its high cost, and has been used more and more widely in engineering. Welded steel structure is widely used because of its simple construction, convenient processing, easy automation, no rod section reduction, steel saving and so on. In the application of welded steel structure, some problems have also appeared, which should be paid attention to in the construction of welded steel structure. This article expounds the authors experience in this respect. I. requirements for welding performance of steel The steel structure of a project is 1020 * 12 steel tube, and cracks are produced along the radial direction after welding. The crack length is about 1000mm, and the maximum width is about 20mm. Because the carbon is an important element of steel welding, welding steel structure steel should ensure that carbon (C) content limit, should adopt low alloy structural steel and carbon steel grade Q345 grade Q235 in B, C, D, C, B level in D grade. The restraint of the component joints is strong, and the plate thickness is equal to or greater than 50mm, and the welded steel structure acti