我厂江边泵房12sh-13型4~#水泵安装不久,在泵壳与进水口法兰处发现长250mm的裂纹,经试车,漏水严重。水泵材质为HT20-40灰口铸铁,法兰外径435mm、厚24mm;泵体壁厚14～16mm。裂纹位置见图1。采用不拆卸机体,用结422焊条补焊,焊后进行0.21MPa水压试验,无渗水现象,运行情况良好。具体操作工艺如下: 1.焊前在裂纹的始末两端钻φ6mm的止裂孔。然后用手提式砂轮机开坡口,坡口尺寸 I plant waterfront pump house 12sh-13 type 4 ~ # pump installed soon, found in the pump casing and inlet flange 250mm long crack, the test car, serious water leakage. Pump material is HT20-40 gray cast iron, flange diameter 435mm, thickness 24mm; pump wall thickness 14 ~ 16mm. Crack location shown in Figure 1. The use of non-demolition of the body, knot welding with knot 422, 0.21MPa after welding pressure test, no water seepage, running in good condition. The specific operation process is as follows: 1. Before welding crack both ends of the crack φ6mm hole. Then with a portable grinder groove, groove size