Abstract: To address the technical challenge of liquefaction cracking in the electronic beam welded joint of the Mar-M247/GH4169 superalloy, targeted finite element analysis and experimental validation were conducted. This study employed a combined approach of finite element simulation and experimental validation. Specifically, by analyzing prevailing crack formation mechanisms, the concept of sensitivity temperature range equivalent stress increment (S_STRESI) was proposed to evaluate the liquefaction crack sensitivity of electronic beam welded joints in dissimilar high-temperature alloys. The accuracy of S_STRESI was validated through comparative analysis with actual crack conditions. A finite element model was utilized to elucidate effective suppression strategies for liquefaction cracks, demonstrating that beam offset and preheating methods can significantly reduce cracking sensitivity in the heat-affected zone of high-temperature alloys. Research findings indicate that the S_STRESI peak occurs at approximately 428 MPa in the central region of the side heat-affected zone of Mar-M247, which also corresponds to the location of observed liquefaction cracks. Both beam offset and preheating effectively mitigate the S_STRESI peak to reduce liquefaction crack sensitivity. When the offset is 0.5 mm, the S_STRESI peak decreases to 400 MPa; at 1 mm, it drops to 355 MPa; and at 1.5 mm, the S_STRESI peak region disappears. Increasing the preheating temperature to 200 ℃ reduces the S_STRESI peak to 352 MPa, while exceeding 600 ℃ completely eliminates the S_STRESI peak range. When the beam is offset by 1.5 mm from the GH4169 side and preheated to 600 ℃, it effectively prevents liquefaction cracks from forming in the central region of the side heat-affected zone of Mar-M247. The beam offset reduces the thermal deformation difference between the two sides of the heat-affected zone, balancing the stress states on both sides of the welded joint. This lowers the S_STRESI (side stress) extremum of Mar-M247 and thus avoids the occurrence of liquefaction cracks.