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the Research of Influnce of Construction Site on Thick Steel Plate Welding Stress

Author: YangWu
Tutor: LiuXiaoYu；ShenXiaoJun
School: Chongqing Jiaotong University
Course: Structural Engineering
Keywords: Thick steel plate Residual stress Site environment Impact factor Quality defects Elimination
CLC: TG404
Type: Master's thesis
Year: 2010
Downloads: 101
Quote: 1
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Abstract


In practical engineering, quality control, if you ignore the environmental impact of the construction site factors, will result in the quality of welding defects. Analysis of the quality of the construction site welding factors, the development of effective field welding process, ensure the welding quality to meet regulatory requirements, is the focus of the steel structure engineering and welding technology and quality management. Construction site environment plays an important role in the quality of the welding of steel structures, must be given high priority, to avoid the harmful environment of the construction site of the welding quality. Construction site instability, the process of structural materials, component node structure has also been developments and changes in the environment objectively. Factors for various welding defects, only at the qualitative analysis phase, effective measures for the prevention and elimination of all kinds of welding defects or combination of approaches using technology test and engineering experience. Therefore, the welding parameters for specific construction environment, quality control and safety measures also requires that the engineering and technical personnel innovation and gradual improvement. With the development of the steel structure technology more widely thick steel plate in steel bridges. Although the rigidity of the steel plate, but in the welding process, easy to produce residual stress, severely affected by the use of performance of the structure. Currently, the thick steel plate welded not yet mature research, the size of the thick steel plate welding residual stress distribution law, and the causes need further analysis. In this thesis, Chongqing Daning River Bridge welding research topics for papers background, using the finite element simulation software MSC.Marc2005 bridge structure welds and heat affected zone and boundary conditions influencing factors loaded, especially for focus the environmental characteristics of the construction site of the weld residual stress analysis, obtained the degree of influence of air temperature, humidity, wind, and other influencing factors welding stress. Most direct effect of the temperature, the most serious consequences, but also the most difficult to control; the Humidity second; wind control measures can be taken in small local environment; findings of this paper can provide reliable for construction welding quality control reference . Characteristics and welding difficulty for the new era of construction steel, steel structure construction site welding characteristics of the environment, the paper first of welding quality defects caused by the construction site environmental analysis, appropriate protective measures, welding of structural steel engineering construction workers has a certain reference value. Secondly, according to the conditions of the construction of the project site proposed method of the test welding residual stress and reduce or eliminate the residual stress and effective measures in order to ensure the safety of the bridge structure.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Welding, metal cutting and metal bonding > Welding general issues > Stress and deformation of welded structures
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