水下高压空气环境下GMAW电弧特性试验

Experiment on characteristics of GMAW arc in underwater hyperbaric air condition

采用高压试验舱模拟水下高压干式焊接环境,以压缩空气为气源进行加压,通过防燃爆试验验证在0.1~0.7 MPa范围内,在CO2和混合气（80%Ar＋20%CO2）作为保护气源的情况下,可以进行正常的GMAW焊接过程.在此基础上,通过试验研究了高压空气环境下GMAW电弧特性,分别考察了环境压力、焊接电流、焊丝伸出长度和保护气种类及流量对焊接电弧特性的影响规律,并给出试验结果.借助最小二乘法对试验数据进行拟合,得出了高压空气环境下GMAW电弧电压的数学模型.

GMAW（gas metal arc welding） progress was fluently executed under the range of 0.1-0.7 MPa air pressure shielded by CO2 and 80%Ar＋20%CO2 gases,which were tested by the igniting and exploding experiments using a hyperbaric cabin to simulate the underwater conditions.The arc characteristics of the GMAW were studied in hyperbaric conditions to discover the law of the arc affected by the environment pressure,the welding current,the stick-out,the gas type and the gas-flow.The experiments results were also given,and a mathematical model under the high-pressure air condition was found by using the least square approximation method based on the experimental data.