Original preheating temperature: the temperature of the workpiece in the weld zone immediately prior to any welding operation.
初始预热温度是指任何焊接操作开始之前，焊接区域内工件的瞬时温度。
Original preheating temperature: the temperature of the workpiece in the weld zone immediately prior to any welding operation.
初始预热温度是指任何焊接操作开始之前，焊接区域内工件的瞬时温度。
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