水下焊接高压空气环境下GTAW电弧特性  

Characteristics of GTAW arc in underwater welding under high-pressure air condition

作　　者：蒋力培[1] 王中辉[1] 焦向东[1] 周灿丰[1] 房晓明[2] 马洪新[2] 

机构地区：[1]北京石油化工学院光机电装备技术北京市重点实验室,北京102617 [2]海洋石油工程股份有限公司,天津300451

出　　处：《焊接学报》2007年第6期1-4,共4页Transactions of The China Welding Institution

基　　金：国家"863"高技术研究发展计划资助项目(2002AA602012-3);北京市自然科学基金(Z200410017008);北京市属市管高等学校人才强教计划资助项目

摘　　要：利用自制的高压干法水下焊接模拟试验平台，首次系统研究了高压空气环境下GTAW电弧特性。结果表明，空气环境下GTAW电弧的安全压力范围可高达0．7MPa；高压空气环境下的GTAW电弧电压值为12～19V，略高于同样压力的氩气环境下氩弧值，其电弧静特性在电流大于50A时呈上升特性；随着空气环境压力升高，GTAW电弧的弧柱电场强度与阴阳极压降增加，导致电弧静特性曲线上移，其上升率约为5-10V/MPa。在试验数据的基础上，建立了高压空气环境下的GTAW电弧电压数学模型，该数学模型可用于综合分析计算电弧长度、环境压力和焊接电流对GTAW电弧电压的影响。The characteristics of GTAW(gas tungsten arc welding) arc under high-pressure air condition were studied for the first time using a homemade underwater welding simulation platform.It is revealed that the GTAW arc under high-pressure air environment has following distinguished features: its safe pressure range for underwater welding might be up to 0.7 MPa;its voltage is from 12 to 19 V,a little higher than those of argon arc under argon surrounding;its static characteristic curve is assurgent when welding currents exceeds 50 A.The column electric field intensity of GTAW arc and the voltages of the cathode and anode are augmented as the air pressure becomes higher,which results in an upward shift on the static characteristic curve with an ascend rate about 5-10 V/MPa.Base on the experimental data,a mathematical model of GTAW arc voltage under high-pressure air condition was founded.The model is useful to analyze and calculate the effect of the arc length,air environmental pressure and welding current on GTAW arc voltage.

关 键 词：水下焊接 高压干法 空气环境 电弧 

分 类 号：TG456.5[金属学及工艺—焊接] TG403