Essentials’ Researching Of Welding Quality Control Of The Large-scale Steel Structure Manufacture

With the economic construction of China turns into a rapid development phase, meanwhile, most engineering structures havebeing experienced complex and large-oriented development. The welding quality becomes focal point with the extensive application of the steel structure. Obviously, the welding shall be high-quality; otherwise, large loss would be caused by the welding defects during the service.Although the modern welding technology could provide a good welding quality in a significant measure, but we couldn’t get hundred percent defect free welding joints during the construction progress because of the complicated distribution of stress and metallographic structure; furthermore, we couldn’t avoid new defect appears during the service of the steel structure. The only way out is control the welding process and progress strictly, so that we can get qualified welding joints. The welding quality controls are composed of three phases, i.e. preparation before welding commencement, quality control during welding and quality inspection after welding completion. Every phase includes several working procedures and base on the relative quality requirements. as to the quality control during welding, the key factor is all people involved, all these people shall carry out all related activities, such as welding and inspection, according to the requirements of quality control documents strictly;at the last phase of welding quality control is NDE (Non-Destructive Examination), that is the critical part of the welding quality control; meanwhile, the article introduce the catalogs of welding defects, the reason and prevention measures of the welding defects. The only way to decrease and terminate the welding defects is fully understand what causes the welding defects, so that we can improve the welding quality. It turned out that with the development of new technologies, operators’ skill, welding process, equipment, welding consumables and inspection tools, people will well-know how to control the welding quality effectively and get high-quality welding products.