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    Arc Blow: General Review

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    Rajbanul Akhond
    This document discusses arc blow, which is the unwanted deflection of an electric arc during welding. There are two main types: magnetic and thermal. Magnetic arc blow occurs due to the magnetic field created around the arc and workpiece by the welding current, which can deflect the arc. Alternating current helps counteract this effect through induced eddy currents. Some techniques for preventing excessive magnetic arc blow include keeping the arc short, reducing current, angling the electrode, and applying frequent tack welds.

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    Arc Blow: General Review

    Uploaded by

    Rajbanul Akhond
    25 views2 pages
    This document discusses arc blow, which is the unwanted deflection of an electric arc during welding. There are two main types: magnetic and thermal. Magnetic arc blow occurs due to the magnetic field created around the arc and workpiece by the welding current, which can deflect the arc. Alternating current helps counteract this effect through induced eddy currents. Some techniques for preventing excessive magnetic arc blow include keeping the arc short, reducing current, angling the electrode, and applying frequent tack welds.

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    Arc blow: General review

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    This document discusses arc blow, which is the unwanted deflection of an electric arc during welding. There are two main types: magnetic and thermal. Magnetic arc blow occurs due to the magnetic field created around the arc and workpiece by the welding current, which can deflect the arc. Alternating current helps counteract this effect through induced eddy currents. Some techniques for preventing excessive magnetic arc blow include keeping the arc short, reducing current, angling the electrode, and applying frequent tack welds.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    25 views2 pages

    Arc Blow: General Review

    Uploaded by

    Rajbanul Akhond
    This document discusses arc blow, which is the unwanted deflection of an electric arc during welding. There are two main types: magnetic and thermal. Magnetic arc blow occurs due to the magnetic field created around the arc and workpiece by the welding current, which can deflect the arc. Alternating current helps counteract this effect through induced eddy currents. Some techniques for preventing excessive magnetic arc blow include keeping the arc short, reducing current, angling the electrode, and applying frequent tack welds.

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    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    See discussions, stats, and author profiles for this publication at: https://www.researchgate.

    net/publication/336071007

    ARC BLOW (General Review)

    Preprint · September 2019


    DOI: 10.13140/RG.2.2.31745.40804

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    1 author:

    Rajbanul Akhond
    Bangladesh University of Engineering and Technology
    13 PUBLICATIONS   0 CITATIONS   

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    SHORT NOTE
    ARC BLOW
    Arc blow is the, usually unwanted, deflection of the arc during arc welding. There are two types of arc
    blow commonly known in the electric welding industry: magnetic and thermal. 1 We are interested in
    magnetic arc blow in this paper.

    While welding any type of joint and in whatever position


    it may be magnetic disturbance of the arc more
    Magnetic field
    commonly known as arc blow is present to some extent.
    When this disturbance is excessive it becomes very
    difficult to control the molten pool to produce good Current path
    uniform welds. The operator is forced to fight arc blow
    and the work usually suffers in quality when direct
    current (DC) is used for welding. Arc blow is likely to
    become excessive on work involving corners and it is
    particularly troublesome at the beginning and end of
    joints.

    When welding with DC the current flowing through the


    arc and the work causes a magnetic field to be set up in Figure 1: Arc blow due to magnetic disturbance.
    the work. This magnetic field affects the arc exactly as if a
    magnet were placed near it deflecting it from its true course. When AC is used the current changes, its
    direction flowing first in one direction and then in the other. The magnetic fields set up in the work by this
    alternating current naturally change their direction every
    time the current changes direction, as this magnetism
    builds up and dies down circulating currents (Eddy
    current) of electricity are caused to flow in the work.
    These circulating currents in turn produce magnetism
    that opposes the magnetism produced by the welding
    current. The effect on the arc is canceled out and now the
    arc is stable and does not deflect.

    Holding as short an arc as possible to help the arc force


    counteract the arc blow, reducing the welding current
    which may require a reduction in arc speed, angling the
    electrode with the work opposite the direction of arc
    blow, making a heavy tack weld on both ends of the Figure 2: Two opposing magnetic field, one
    seam, applying frequent tack welds along the seam etc. generated by welding current (Blue arrow) &
    are some common ways to prevent arc blowing.2 another by eddy current (Red arrow).

    1
    Arc blow – Wikipedia https://en.wikipedia.org/wiki/Arc_blow

    2
    Preventing Arc Blow – https://www.lincolnelectric.com/en-us/support/welding-how-to

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