Aim\ To determine the explosive welding conditions of the aluminium alloy Ly12 on the A3 steel. Methods\ A new method with a thin steel plate between the aluminium alloy (composite plate) and the steel (base plate)is adopted after analyzing the problems appeared in the experiment of direct welding of Ly12 aluminium alloy on A3 steel. Results\ The correct explosive welding conditions of the Ly12 aluminium alloy and A3 steel is obtained. Conclusion\ While the intermediate material is inserted

Ly12 aluminium alloy and A3 steel could be welded successfully.