| The PAW-2000 welding machine is as research object in this paper, the influence of mix-gas (Ar+CO2) proportion to welding process was studied. With the increase of CO2 proportion, the fusion depth in horizontal position, Vertical position, and position also increases. When the proportion of field gas is similar, the fusion depth HVertical>Hhorizontal>Hoverhead.The parameters matching rule of PAW-2000 was studied, a suit of theory formula of increase eligibility ratio formed, the wire speed VS = KVh, the K is speed ratio . The speed ratio K is inverse ratio to the wire diameter, and direct ratio to each fusion metal cross section S. Wire speed and welding speed parameters adjust principle was confirmed.The defects of pipeline auto-welding was analyzed, and put forward the prevent method measurement. The result of radial test and auto-ultrasonic test was contrast and analyzed, and put forward the prime test method of pipeline auto-welding joints.Contrast by the normal temperature and low temperature environment three auto-welding process, analyzed the mechanics properties, impact tenacity, hardness, metallo-graphy. When the environment temperature -30℃, pre-heat temperature 120℃, inter-pass temperature than 100℃, and the pre-heat range 300mm, the pipeline auto-welding joints properties contents the request, the welding process is good.
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