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1 材质分析经过观察掉落的几块的断口材质为灰口铸铁.2 焊前准备(1)将少量的φ3.2mm的Z308焊条在200℃烘焙1h待用.(2)将备作填充层用的φ2.5mm的J426焊条在300℃烘培1.5h后待用.(3)根据不同的焊接位置采用不同的手段进行坡口加工和选择留焊处(止裂孔),坡口形式见图2.平焊位置使用角向磨光机修出U形坡口,坡口加工不得超过尺寸要求,否则堆堆金属过多,焊缝金属的内应力过大.易导致焊缝产生裂缝.严重的会使焊缝剥离;立焊位置使用电
1 Material Analysis After the observation of the few pieces of the broken material is gray cast iron .2 Preparation before welding (1) a small amount of φ3.2mm Z308 electrode baked at 200 ℃ for 1h standby. (2) Used φ2.5mm J426 electrode baking at 300 ℃ 1.5h stand-by. (3) according to the different welding position using different means of processing and choose to leave the mouth groove (hole), the groove form shown in Figure 2. Flat welding position using the angle grinder repair U-shaped groove, beveling process shall not exceed the size requirements, or excessive pile of metal, weld metal internal stress is too large. Easily lead to cracks in the weld. Serious Will make the weld stripping; vertical welding position using electricity