Removal of Residual Magnetism before Arc Welding by Bridge Piece Technique – A case study

Author(s): A. Arun, A. Ramchandran, M. Vinoth

Abstract: Tubes and Pipes used in Boiler Industries are commonly fabricated by using arc Welding Process. One of the major challenging factors in arc welding of pipes and tubes having residual magnetism is Arc Blow. Many Demagnetization methods are employed for reducing this residual magnetism before welding. But all these methods have certain limitations which restrict their usage for many industrial applications. Bridge Piece Technique is a thermal demagnetization method developed in a simple and practical manner to sort out this issue. This article clearly explains the principle and simple procedure for adopting bridge piece technique to remove residual magnetism before arc welding of pipe / tubes.