1前言在大容量变压器的制造过程中,为了降低产品漏磁场附近各种结构件中的损耗和避免出现局部过热现象,各变压器厂家通常采用低磁钢材料。20Mn23Al是国内大型变压器制造厂普遍采用的一种无磁钢,但在普通的机械工业生产中应用较少,没有成熟的焊接工艺及专用的焊接材料。国内大多数变压器厂家一般采用A202、A302和A132等焊 1 Introduction In the manufacturing process of large-capacity transformers, in order to reduce the loss of various structures around the leakage magnetic field of the product and avoid the phenomenon of local overheating, the transformer manufacturers generally adopt the low-magnetic material. 20Mn23Al is a kind of non-magnetic steel widely used in the domestic large-scale transformer factory. However, it has less application in common mechanical industrial production, no mature welding technology and special welding materials. Most domestic transformer manufacturers generally use A202, A302 and A132 and other welding