Abstract: The dissimilar steel welding technology of a lock component was discussed in this work. The base material consisted of the high manganese cast steel treated by water toughening and the pressure cast steel treated by tempering, of which the high manganese cast steel had an austenitic structure and the pressure cast steel had a sorbitic structure. For the significant differences in the chemical composition, the coefficient of linear expansion, and the thermal conductivity between these two base materials, the welding between the high manganese cast steel and the pressure cast steel is a big challenge. The welding technology of the method selection, the process optimization,and the quality inspection were analyzed and discussed on these two base materials. And then a general technique for the welding dissimilar materials between the high manganese cast steel and the pressure cast steel was summarized.