给水鹤是给机车上水的设备,材质为灰铸铁,主体管壁厚为15～20mm,承受水压0.6～1.3MPa(6～13Kgf/cm~2)。我厂地处北方,冬季气温达零下38～40℃,因铸铁管内余水未放尽,造成管壁严重冻裂,开裂情况见图1。由于给水鹤尺寸高大,预热焊有困难,因此采用电弧冷焊进行补焊。经二年多使用证明,补焊是成功的,为国家挽回了上万元的损失。现将 Water supply crane is a locomotive water equipment, made of gray iron, the main pipe wall thickness of 15 ~ 20mm, to withstand water pressure 0.6 ~ 1.3MPa (6 ~ 13Kgf / cm ~ 2). Our factory is located in the north, the winter temperature of minus 38 ~ 40 ℃, due to cast iron pipe remaining water is not exhausted, resulting in severe cracking of the wall, the cracking situation shown in Figure 1. Due to the size of feed water crane, preheating welding difficulties, so the use of arc cold welding repair welding. After more than two years of use proved that repair welding is successful, for the country to restore the loss of tens of thousands. Now