INTELLIGENT PREHEATING FLASH BUTT WELDING METHOD CONSIDERING TEMPERATURE FIELD CHANGE AT WELDING SEAM

• Main Authors: SU, Shijie, WENG, Haibo, LI, Wenda, DONG, Shihui, ZHANG, Jian, GAO, Jiahe, KONG, Bowen, ZHU, Shenao
• Format: Patent
• Language: Chinese; English; French
• Published: 22.08.2024
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

An intelligent preheating flash butt welding method considering temperature field change at a welding seam, comprising clamping, a pre-flashing stage, a preheating stage, a continuous flashing stage, an upsetting stage, and a reset stage, wherein in the pre-flashing stage, the time and pre-flashing frequency of one single pre-flashing are controlled according to the relationship between a welding current and a threshold current and a temperature field at the welding seam; in the preheating stage, the cooling time and preheating frequency of one single preheating are controlled according to the relationship between the welding current and the threshold current and the temperature field at the welding seam; in the continuous flashing stage, the starting point of the continuous flashing is determined according to the distance between movable and fixed clamps when the welding current is larger than the threshold current for the first time in the stage; and in the upsetting stage, the non-electric upsetting time i