Abstract: The reasons of crack phenomenon and bad welding effect at four edges are analyzed,which tend to appear in the explosive welding of tool-steel and Q235 carbon-steel forming composite sheet.It's found that there are some connections among explosive speed,interface wave and shear intensity through test and study of the size and intensity distribution law of the composite sheet bonding interface,and also point out that not only the interface approximate to direct bonding(fine wave bonding) has enough bonding intensity,but also its explosive load is smaller than others,and therfore,it is the most desirable bonding.On the basis of tests and analyses,we have produced 36 pieces of composite sheets of T10 tool-steel bonded with Q235 carbon steel whose sizes ranged from 0.5 m² to 1.5 m² by explosive welding tchnology.The bonding rate of welding beyond 98% and the performance of antibend and shear intensity are all satisfied for the sheets.