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In this study, a composite sandwich was used as an intermediate layer and TC4/304 stainless steel was joined by explosion welding. First, intermetallic compounds with different butt joint sizes were added. When the length of the butt joint was kept at 4 mm, the mechanical properties of the joint increased with the extension length. The maximum tensile strength of the joint was 600 MPa when the extension length was varied between 1 and 2.5 mm. A ''net basket organization'' was formed in the titanium-side weld, and α → β and β → α ′ phase transitions occurred. Comparative microstructural analysis shows that the aspect ratio of the organization decreases with the increase of the length of the titanium side weld.