Abstract: High manganese cast steel ZGMn18 and low alloy cast steel G20Mn5 are selected for the liner plate and bracket of the boom of super large single cylinder hydraulic cone crusher,which are easy to crack after welding due to their large differences in chemical composition,physical and mechanical properties.Aiming at the problem of welding cracking of dissimilar high manganese cast steel,this paper selects two welding process experiments,namely MAG welding and manual arc welding.The welding process is optimized by selecting austenitic stainless steel welding materials,no preheating before welding,no heat preservation after welding,controlling the inter-pass temperature≤200℃,and releasing stress after welding by hammer.After welding,the static load properties of different welding methods were analyzed,and the reliability welding of high manganese cast steel and low alloy cast steel was realized.