As a welder nears the end of a joint, the magnetic flux intensifies ahead of the electrode. This happens as the magnetic flux tries to stay in the metal rather than release into the air. The resultant back flow of molten metal in the direction of the beginning is known as?

As a welder nears the end of a joint, the magnetic flux intensifies ahead of the electrode. This happens as the magnetic flux tries to stay in the metal rather than release into the air. The resultant back flow of molten metal in the direction of the beginning is known as?