本文对带磁管道焊接时引起的磁偏吹的原理作了初步探讨。焊口剩磁场所产生的洛伦兹力和焊接电流自身产生的电磁收缩力向量的和决定了磁偏吹的强弱,可利用电弧偏吹方向确定焊口磁场方向,并介绍了几种焊接现场实用的退磁方法。 This paper makes a preliminary discussion on the principle of partial magnetic blow caused by magnetic pipe welding. The sum of the Lorentz force generated by the welding residual magnetic field and the electromagnetic contractile force vector generated by the welding current itself determines the strength of the magnetic deflection blow. The direction of the electric arc blowout can be used to determine the direction of the magnetic field of the welding mouth and several types of welding Field practical demagnetization method.