The welding technology used for preheating flash butt welding was evaluated for workpieces with large welding section.
针对大截面工件的闪光对焊工艺特点，确定了预热闪光焊的焊接工艺。
There are four phases and dozens of parameters in preheating flash butt welding technology used for great section workpiece's welding.
用于焊接大截面工件的预热闪光焊工艺包括四个阶段。
Preheating section for line length is longer, the temperature is not more than 250 degrees, and not let the discoloration of copper wire.
预热段因线的长度比较长，温度不会超过250度，不至于让铜线变色的。
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