Do you know why the weld has the shape of fish scales?

  • Dec 25, 2019
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All welcome. We continue our welding diary. And today I want to understand this easy and simple theme, which will be useful to you for the overall development outlook in welding and weld why resembles fish scales? The thing in the process that occurs during arcing between the end electrode and the base metal. And what is so interesting is going on? When we strike sharply on the electrode metal, the arc appears, let's look at the arc, we see there? The electrode metal flows into the weld pool in the form of rain! Yes this is so, a droplet of the molten metal is collected on the electrode tip and takes the shape of a pear.

Then, at the base of this droplet quickly appears thin neck, in which the current density increases and the metal is heated, the neck is extended and becomes thinner, touching the weld pool and closing the metal electrode and circuited. The neck is broken and the gas pressure is dropped toward the crater welding bath. Following there is a new drop, and everything is repeated.

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The second electrode to the weld pool is transferred from 20 to 50 drops of the molten metal of the same size. Arc pressure is dropped molten metal bath from the bottom at its side surface, and it occurs over time again, so the molten metal is deposited in individual portions, and congealing obtained scaly surface seam. That's the secret!

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