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Development of underwater wet welding experimental and divers training system

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China welding 2012年第4期21卷 43-48页

作者：贾传宝陈波王芳殷子强袁新 Yin Ziqiang and Yuan Xin Shandong Provincial Key Laboratory of Special Welding Technology Institute of Oceanographic Instrumentation Shandong Academy of Sciences Qingdao 266001 School of Materials Science and Engineering Harbin Institute of Technology at Weihai Weihai 264209

Compared to traditional welding methods, the underwater wet welding is special with many different characteristics due to the unique aqueous environment. It is conducted completely under water by divers and unique welding technology is required in the special operation environment. The operating levels of the divers are the key factor to acquire high quality welded joints. In this paper, an underwater wet welding experimental and divers training system is developed to serve divers training and conducting welding experiments. The system consists of life support system, signals real-time monitoring system and communicating system, etc. An underwater butt welding experiment based on welding electrodes is conducted, and the system works well. It proves that the system can guarantee divers welding safely and successfully and high quality weld seam is expected to be acquired.

关键词： underwater wet welding divers training system monitoring flux-cored arc welding

Finite element analysis of the angular distortion and residual stress in underwater wet welding

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China welding 2013年第2期22卷 6-11页

作者：赵博武传松贾传宝袁新 Key Laboratory for Liquid-Solid Structure Evolution and Processing of Materials Ministry of Education Shandong University Jinan 250061 Shandong Provincial Key Laboratory of Special welding Technology Shandong Academy of Sciences Institute of Oceanographic Instrumentation Qingdao 266000

In underwater environment, the shape, voltage, and energy density of the welding arc vary because of the high pressure and there are notable changes in workpiece cooling conditions due to the strong cooling effect of water. As a result, there are clear differences between the residual stress and thermal distortion in underwater wet welding and those in conventional welding （in air）. Considering these process features, a thermo-mechanical finite element model of underwater wet bead-on-plate welding was established. The influences of the water compressing action to the arc and the enhanced heat losses caused by the surrounding water on the residual stress and the angular distortion of the workpiece were analyzed. Results show that the angular distortion gets smaller in deeper water, and that the longitudinal residual stress gets smaller as water flows faster.

关键词： residual stress distortion underwater wet welding finite element analysis

Effects of process parameters on the depth-to-width ratio of flux-cored wire underwater wet welding

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China welding 2013年第1期22卷 35-40页

作者：韩焱飞郭宁王芳袁新冯吉才 Stale Key Laboratory of Advanced welding and Joining Harbin Institute of Technology Harbin 150001. Institute of Oceanographic Instrumentation. Shandong Academy of Sciences Qingdao 266001.

The effects of process parameters on the depth-to-width ratio （D/W） of flux-cored wire underwater wet welding with a certain type of homemade .flux-cored wire are studied. It is found that the welding .speed, wire feeding speed and torch oscillating amplitude hare significant effects on the dopth-to-width ratio （D/W） of welds. The D/W ratio of welds increases significantly with the increase of welding speed without the oscillating of welding torch. It increased （from 0. 14 to 0. 26 ） with the increase of wire feeding speed while the torch oscillating. And it decreased linearly with the increase of torch oscillating amplitude. However, the influelwe of oscillating speed, wire extension and welding voltage on the D/W ratio of welds was not obvious.

关键词： flux-cored wire underwater wet welding depth-to-width ratio

Analysis of the electrical conductivity of plasma during underwater wet welding

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China welding 2011年第3期20卷 71-74页

作者：李志刚张华贾剑平 Institute of Mechanical and Electrical Engineering East China Jiaotong University Nanchang 330013 Institute of Mechanical and Electrical Engineering Nanchang University Nanchang 330031

The electrical conductivity is indispensable for the underwater wet welding arc simulation. In order to get this parameter, the composition of the underwater arc is analyzed, and the electron content is obtained. Then the current formation mechanism in the arc and the effective collision cross-sectional area between the electron and ions is discussed. The calculation methods and results analysis are presented in this paper.

关键词： conductivity plasma underwater wet welding

Study of pores produced in underwater wet welding

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China welding 2006年第2期15卷 40-43页

作者：沈晓勤刘世明 College of Mechanical Engineering South China University of Technology

This paper deals with the effect of water depth in the range of 10 m to 80 m upon the formation of pores produced during underwater wet welding. The results show that it is easy for the inner pores to occur owing to the particularity of the molten metal solidification that the outer pores begin to appear when the water depth increases to about 60 m, that the porosity increases and pore grows up as the water depth increases, and that pores are all hydrogen-containing ones through the examination of the variation of number of pores with the residual hydrogen and oxygen content in the weld metal.

关键词： underwater wet welding water depth pore porosity residual hydrogen

Research on porosity of underwater wet FCAW duplex stainless steel

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China welding 2016年第2期25卷 27-33页

作者： Shi Yonghua Hu Yu Li Zhihui Lin Shuiqiang Shen Xiaoqin Yi Yaoyong Yi Jianglong School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou510640 Guangdong welding Institute(China-Ukraine E.O.Paton Institute of welding) Guangzhou 510650

To study the influence laws of welding parameters on weld porosity, underwater wet flux-cored arc welding （ FCAW） duplex stainless steel S32101 was carried out in a hyperbaric chamber, and the second-order multiple regression equation was established. The interactive effects of welding parameters on the porosity were analyzed by the three dimensional response surfaces and the contour plots. The results present that the interaction effect between water depth and voltage on the porosity is the most significant. Theoretically, a non-pores weld bead can be gained by reasonably matching these parameters with water depth less than 10 m. Always, the weld porosity reaches its peak value with a 7 mm/s welding speed.

关键词： underwater wet welding porosity flux-cored arc welding response surface methodology duplex stainless steel