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1·Establish the weld puddle much faster.

快得多地形成焊接熔池。

2·The flux coatings major task is to vaporize and form a shielding gas to protect the weld puddle from nitrogen, hydrogen and oxygen.

通量涂料主要任务是蒸发，形成保护气体保护焊水坑由氮气，氢气和氧气。

3·The problems such as fissure of displacement, slit nonuniform and weld puddle flowing etc at the case of assembling and welding on orbital slit of pressure vessel are analyzed.

分析了在压力容器环缝组对及焊接中存在的错边、间隙不均匀以及焊接中熔池流动等问题。

4·The variation of the plasma gas flow can heavily influence the fluidity of the puddle metal and the weld formation though the diameter of the keyhole is hardly changed.

虽然离子气流量的变化对穿孔熔池的孔径影响较小，但对熔池金属的流动性和焊缝成形影响较大。