Abstract: he hyperbaric welding test chamber and the automatic GTAW machine were developed for high air ambient pressures. The arc static characteristics curves were tested under 0.1~0.7 MPa air ambient pressures, and the mathematical model of GTAW between arc voltage and parameters such as air ambient pressure, arc length, and current, was created. Based on arc static characteristics and the arc voltage mathematical model, main parameters of the automatic GTAW machine and the welding power were set, then typical position free forming joints of 16Mn steel plate under 0.1~0.7 MPa were manufactured, which were classified as class A in AWS D3.6M: 1999.

Key words: High air ambient pressure   ,   , Gas tungsten arc welding(GTAW)  ,   , Arc static characteristics  ,   , Free forming

摘要： 针对高压空气环境的特殊性,研制了高压焊接试验舱和钨极氩弧自动焊机。在0.1~0.7MPa空气环
境中,考察了电弧静特性,并提出了电弧电压与空气环境压力、电弧长度、焊接电流三者之间的数学模型。根据电弧
静特性及其数学模型,设定钨极氩弧自动焊机及其焊接电源主要参数,在0.1~0.7MPa空气环境中,进行了典型位
置16Mn钢板的焊接,采用自由成型工艺形成的全部接头,符合美国焊接学会AWSD3.6M:1999中A 类接头的要
求。

关键词: 高压空气环境   ,   , 钨极氩弧焊接  ,    , 电弧静特性  ,   , 自由成型