256HC Mast Section Problems to be paid attention to in the welding process of tower crane


The welding process specification mainly refers to the current of the welding machine used in this process, the welding rod type and diameter used in this process(if carbon dioxide gas protection welding refers to the welding wire number and diameter, voltage, current density, protection gas flow). The welding rod type and diameter shall be selected according to the material of the soldered parent and the thickness of the soldered part. When welding the main load bearing components and the material is Q235 series low carbon steel and 16Mn low alloy steel, the welding rod should use a good cracking resistance low hydrogen welding rod, such as E4316, etc.. DC reverse connection method is used when welding. 

When welding non-primary load-bearing components and the material is Q235 series, the welding rod should be made of titanium oxide type welding rod. For example, E4303 should use AC welding when welding.

Welding of long and fine rods: In the construction of Tower machines, some welded long and fine rods are often encountered. These rods generally require a large amount of welding, and most of them require continuous welding. Therefore, rod deformation may be encountered. Difficult to handle. There are two ways to solve this problem. One is to adopt a counter-deformation method before welding. The specific approach is to first locate the lower string seal plate and the groove steel. Then use a special kit to fix the lower end of the lower string of the top seal plate to the pad of the middle point of the lower string, so that the middle point of the lower string is 180-200mm higher than the Gaochu at both ends.

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