高压环境下电弧电特性及管道焊接工艺的研究  

Arc characteristic and welding technology for pipeline under high ambient pressure

作　　者：宋广贺 王中辉[2] 蒋力培[2] 焦向东[2] 周灿丰[2] 薛龙[2] 吕涛[2] 

机构地区：[1]鞍钢附企综企冶金车辆厂,辽宁鞍山114041 [2]北京石油化工学院北京市重点实验室,北京大兴102617

出　　处：《焊接技术》2007年第1期33-35,共3页Welding Technology

基　　金：国家"十五"863重大计划项目"水下干式管道维修系统"(2002AA602012-3);北京市自然科学基金暨北京教育委员会科技发展计划重点项目"干式高压TIG焊接电弧行为及其控制的研究"(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,首次研究了高压空气环境下的GTAW电弧电特性,研究表明:随着环境压力的升高,气体密度增大,电离度降低,弧柱电场强度增加,导致电弧静特性曲线上移。利用多元线性回归方法,建立了高压空气环境下的电弧电压数学模型,并在此基础上进行了高压模拟管道焊接工艺试验。研究表明,随着环境压力的增大,焊接电流减小,Ar流量增大。在0.1,0.3,0.5和0.7MPa压力下,选用合理的焊接工艺参数,对于X56管线钢,均获得单面焊双面成形的良好效果。Using the homemade hyperbaric underwater welding simulation experiment equipments, the characteristics of GTAW arc under the high pressure atmosphere surroundings are studied for the first time in the paper. The research indicated that along with the hoist of environmental pressure, the gaseous density is increscent, the degree of ionization is depressed, the electric field intensity of arc column is increscent, the static characteristic curve of electric arc move upwards. After the air pressure boosting, not only the electric field intensity of arc column is increscent, the energy of arc column is enhanced, but also the section of electric arc is shrinked, the density of energy is augmented, so the brightness of electric arc is swelled. Using the means of multiple regression,the mathematical model of arc voltage under the high pressure atmosphere surroundings is founded. The simulation welding experiment of X56 pipeline steel under different pressure s such as 0.1, 0.3, 0.5, 0.7 MPa has been done, and the good effect of one-side welding with back formation is acquired through the choice of reasonable welding parameters.

关 键 词：高压干法焊接 电弧电特性 焊接工艺 

分 类 号：TG457.6[金属学及工艺—焊接]