某装置的管道设计采用了TA2钛材，焊接施工前我们进行了工艺评定试验。采用带有高频引弧和电流衰减装置的直流氟弧焊机（直流正接），焊接工艺参数见表1。表1焊按工艺参我焊接时焊缝正面采用拖罩跟踪喷氩保护法，拖罩保护如图1所示，焊缝内表面采用环状管喷氩保护法，环状充氩 Pipeline design of a device using TA2 titanium, welding before we conducted a process qualification test. DC arc welding machine with high frequency arc starting and current attenuation device (DC positive) is adopted, the welding process parameters are shown in Table 1. Table 1 welding process parameters When I weld the front of the weld with a trailing mask spray argon protection law, drag cover protection shown in Figure 1, the inner surface of the weld pipe ring argon spray protection method, annular argon