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发表于 2021-11-17 18:17:01
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only referance. welcome to fixAC/DC: Understanding PolaritySource: adapted from New Lessons in Arc Welding, The Lincoln Electric Company, 1990General Information Do you know what AC (Alternating Current) and DC (Direct Current) signify on your welder and electrodes? Well, basically these terms describe the polarity of the electrical current that is created by the welder and runs through the electrode. Selecting the electrode with the correct polarity has a real effect on the strength and quality of your weld - so read on and make sure you know the difference! For that extra assurance, try the two tests at the end of the article to help you determine polarity. &#[/I]718;[I]&#[/I]805;; mso-hansi-font-family: [I]&#[/I]718;[I]&#[/I]805;">你知道焊机是怎么表示交流电和直流电及电流极性的，通常来说这些术语表示的是电流的极性，这些极性是由焊工选择，运行在焊条上的，选择正确的焊接极性对焊缝的强度和质量有很大的影响，因此知道和了解他们的不同是很重要的，为了确定性，要做两个实验根据此文的结尾要求有助于帮你了解焊接的极性。The terms "straight" and "reverse" polarity are used around the shop. They may also be expressed as "electrode-negative" and "electrode-positive" polarity. The latter terms are more descriptive and will be used throughout this article. &#[/I]718;[I]&#[/I]805;; mso-hansi-font-family: [I]&#[/I]718;[I]&#[/I]805;">术语，正极和反极通常情况下应用在工厂中，他也可以用焊条反极和焊条正极来表示。后者更具有规范性，在论文和专业中应用广泛。Polarity results from the fact that an electrical circuit has a negative and a positive pole. Direct current (DC) flows in one direction, resulting in a constant polarity. Alternating current (AC) flows half the time in one direction and half the time in the other, changing its polarity 120 times per second with 60-hertz current. &#[/I]718;[I]&#[/I]805;; mso-hansi-font-family: [I]&#[/I]718;[I]&#[/I]805;">极性是因为电流流向有正向和反向，支流电流向是单一的只有一个方向，交流电是变换的，在一个周期内，半个周期是这个方向，另外半个周期是反向的，每秒中如果电流是60HZ&#[/I]718;[I]&#[/I]805;; mso-hansi-font-family: [I]&#[/I]718;[I]&#[/I]805;">那么要变换120&#[/I]718;[I]&#[/I]805;; mso-hansi-font-family: [I]&#[/I]718;[I]&#[/I]805;">次A welder should know the meaning of polarity, and recognize what effect it has |
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