512型压铸机上的合模缸体,在使用中由于铸造缺陷而发生断裂(见图)。该缸材料为 ZG45铸钢。对此我们进行了堆焊修复,焊后经350大气压试验合格。经生产使用证明,焊补质量良好,现将堆焊修复工艺简介如下:一、焊前准备合模缸体的裂纹、砂眼均在缸体底部。底部壁厚为98毫米,其形状复杂,不易焊补。所以焊前准备需注意如下四点。1.先从缸体底部距离为315毫米处切断,另用45钢锻件粗加工出缸体底部。在接头处开坡口,按原缸体内 512-type die-casting machine clamping cylinder, in use due to casting defects and fracture (see photo). The cylinder material is ZG45 cast steel. We have done a surfacing repair, welding after 350 atmospheric pressure test. Production proved that welding quality is good, now surfacing welding repair process is as follows: First, the preparation of welding before the crack of the cylinder block, trachoma are at the bottom of the cylinder. The bottom wall thickness of 98 mm, its complex shape, not welding repair. So before welding preparation should pay attention to the following four points. 1. First from the bottom of the cylinder block at 315 mm off, the other with 45 steel forgings roughing the bottom of the cylinder. Groove in the joints, according to the original cylinder body