某单位,因汽车没及时放水,将缸体冻裂长约130毫米(见图1)。为使汽车尽快修复,我们采用了如下焊接方法。一、焊前准备 1.用钢丝刷或钢锯条清除焊缝两边30毫米范围内的污物及氧化膜,用RH-70号汽油清洗焊缝内的油垢,直至露出金属光泽。 2.开V型坡口,坡口宽6毫米,深应根据机件壁厚情况而定。在开坡口后要用6毫米钻头在裂缝两端钻上止裂孔(见图1中A、B),孔不要钻的过 A unit, because the car did not release the water in a timely manner, the cylinder body cracked about 130 mm long (see Figure 1). In order to make the car repair as soon as possible, we use the following welding method. First, the preparation before welding 1 with a wire brush or hacksaw strip on both sides of the weld to remove dirt and oxide film within the range of 30, with RH-70 gasoline cleaning greases within the weld, until exposed metallic luster. 2. Open V-groove, groove width of 6 mm, the depth should be based on mechanical wall thickness may be. After the beveling with 6 mm drill bit cracked at both ends of the crack (see Figure 1, A, B), the hole should not be drilled