L46A1 Mast Section Problems in welding process of tower crane
The welding process specification mainly refers to the current of the welding machine used in this process, the model and diameter of the welding rod used in this process (for example, the carbon dioxide gas shielded welding refers to the brand and diameter of the welding wire, voltage, current density and flow of the shielding gas). The selection of electrode model and diameter shall be based on the material of base metal and thickness of the weldment. Generally, when the main bearing members are welded and the material is Q235 series low carbon steel and 16Mn low alloy steel, the welding rod shall be low hydrogen welding rod with good crack resistance, such as e4316, etc., which is suitable for DC reverse welding. When welding non main load-bearing components and Q235 series of materials, calcium titanium oxide type welding rod shall be used, for example, E4303 is suitable for AC welding.
Welding of long and thin members: in the manufacturing of tower crane structure, there are often some long and thin members to be welded. Generally, these members need a large amount of welding, and most of them need continuous welding, so it may be difficult to deal with the deformation of members. There are two ways to solve this problem. One is to adopt the anti deformation method before welding. The specific method is to locate and fix the bottom chord sealing plate and channel steel first, and then fix the two ends of the bottom chord of the point upper sealing plate in the middle of the bottom chord with special tooling.
