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Frost cracking of cast iron impeller. How to weld?
The frost crack of cast iron impeller can be welded by hot welding and cold welding.

If it is hot welding, the whole body is preheated to about 600 degrees first, then welded quickly, and then cooled slowly after welding, which can effectively produce cracks.

In case of cold welding, cast iron welding rod with high crack resistance is the main anti-crack means, and special cast iron welding rod for WEWELDING777 can be selected. In addition, in the welding process, the temperature of the parent body should not be too high through the process control of small current and small specification, so as to reduce the influence of stress.