Steel Engineering is mainly structural steel production, is one of the main building structure types. Steel is one of the more common modern construction projects in the form of structure. Our country was the first to use steel load-bearing structure of the iron manufacture, far away in the era of Qin Shi Huang (246-219 BC years) steel manufacturers, we have done a simple load-bearing structure with iron, while Western countries began to use metal in the 17th century load-bearing structure. 3-6 century AD, intelligent and hard-working people of our country on the iron chain suspension bridge built with chains, the famous chain bridge Dadu River in Sichuan Luding, Yunnan and Guizhou Yuan River Bridge River Bridge, etc. are examples of early plate iron body of load-bearing structures . Steel inherent problems; a unit in the processing of a building box columns 1200 * 1200 * 60 in the welding process appeared suddenly found tearing 60mm steel as the web plate, clearly visible cracks from the thickness direction of the plate in half, after NDT testing found the crack depth occurred at a depth of about 3mm steel prices, while the same batch of the same type of cutting board a few additional components for testing, found in a sandwich board memory, rolling poor quality is the main cause of quality problems. In the process of welding the welding stress due to welding materials produced will mezzanine opened. Hence there are planks in the thickness direction of the phenomenon tear Cause Analysis: As part of the special nature of the use of the web as a component in the component used in the longitudinal direction of the upper and lower parts welded in the welding formal opening of the full penetration groove stiffeners the force, due to the existence of a layered interior panels, welding welding stress generated thereby tearing out the release plate thickness direction. You can take the following measures in accordance with the actual situation of several processing: steel manufacturers, Huizhou steel, Peng Jian Steel Ltd. of Dongguan City, Peng Jian provided by steel. Steel Co., Ltd., Dongguan City, Peng Jian (dgpengjian.cn) strong, credible, in Dongguan, Guangdong steel industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement Peng Jian innovative ideas will lead into the brilliant steel and you work for a better future!