Explain what magnetic flux lines are and how they may cause a wire to move when welding with very high amperages.
What will be an ideal response?
When electrons flow they create lines of magnetic force that circle around the line of flow. Lines of magnetic force are referred to as magnetic flux lines. These lines space themselves evenly along a current-carrying wire. If the wire is bent, the flux lines on one side are compressed together, and those on the other side are stretched out. The unevenly spaced flux lines try to straighten the wire so that the lines can be evenly spaced once again. The force that they place on the wire is usually small. However, when welding with very high amperages, 600 amperes or more, the force may cause the wire to move.
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