并简述了直流正极性焊接铝合金所存在的问题和应用前景。
The existing problems and application prospects of Aluminium welding with straight polarity direct current method are sketched out in this paper.
一个正极性的直流电压加于该电极上。
A positive polarity dc voltage is applied to the electrodes.
直流电压下X射线对气隙、油隙放电的激发过程存在明显的“滞后”现象，即：正极性电压下X射线照射首先抑制放电的发生；
Under DC voltage the restraint and time lag phenomena of partial discharge (PD) in cavities or oil gap by X ray irradiation were investigated.
放电间隙较大的静止状态下，直流电压正极性和交流电压下气固混合两相体的击穿电压都大于相同条件下单一空气的，而直流电压负极性时则相反。
In the in- active state, the breakdown voltage were higher than the single air in the same conditions under AC and positive DC voltage, but it was opposite under negative DC voltage.
当负极性比率等于零即直流且焊丝为正极性的MIG焊时，其焊缝熔深最大，焊丝熔化系数最小，熔敷速度最小；
When electrode negative ratio is zero, which is using MIG welding with DC ami welding wire being positive polarity, weld penetration is maximum , wire melting speed and deposition rate are minimum;
当负极性比率等于零即直流且焊丝为正极性的MIG焊时，其焊缝熔深最大，焊丝熔化系数最小，熔敷速度最小；
When electrode negative ratio is zero, which is using MIG welding with DC ami welding wire being positive polarity, weld penetration is maximum , wire melting speed and deposition rate are minimum;
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