The cast iron gate has a crack of more than one meter. If it cracks, it can be welded. If it is to withstand a force of 5 tons, the groove design must be done well. If conditions permit, double-sided welding is best, and the strength Mainly consider the following points. The first is the tensile strength of the welding material itself, such as selecting WEWELDING777 cast iron electrode with a high strength of 48 kg. The second is that the groove design must meet the groove of at least 2/3 of the parent body thickness. When using low carbon steel for reinforcement welding, you need to choose cast iron electrodes suitable for dissimilar welding of cast iron and carbon steel, such as WEWELDING777 cast iron electrode welding. The third welding process should use cold welding technology to ensure that the temperature of each section and each layer cannot be too high. , do tapping to release stress.