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How To Prevent Arc Blow In Welding. Not only does this reduce the distance over which the arc can wander but it usually means reducing current. The pipelines with 10.
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Arc blow is usually more pronounced at the start of the weld seam. If youre facing arc blow though AC is the obvious first step. In fact control of the direction of the returning current is one way to control arc blow especially useful with automatic welding processes.
Angle the electrode in the opposite direction of the arc blow Use short arc length as much as possible Use heavy tack welds at end of the joint with intermediate tack welds along the length of the joint.
A so-called Scott connection accomplishes this automatically. Other measures must also be used to reduce the difficulties caused by arc blow when welding. Reduce the residual magnetism in the steel to a tolerable level less than 50 gauss. Normally there are some magnetic in the surroundings such as the electromagnetic field of the metal sheet.
