Are you asking which of the three companies, Wantong, Cage Rongcheng and Chengdu Welding Training Center, can take the pressure pipeline exam? Wantong and Cage Rongcheng, Chengdu Welding Training Center, can test pressure pipes. The skills training programs of Rongcheng Vocational School include: welder training, manual welding, double-sided shielded welding, argon arc welding, gas cutting and pressure pipe welding. Cage's training programs include: electric welding, argon arc welding, carbon dioxide gas shielded welding, boiler and pressure vessel, all-position welding, pipeline high-pressure welding, vessel welding, argon arc welding, ship welding, gas welding and gas cutting. Wantong training programs include: electric welding, gas welding, manual arc welding, CO2 welding, argon arc welding and argon arc welding.