24
2018
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02
Four welding methods commonly used in steel structures
Author：
Steel structure must be welded during processing. In order to meet different welding needs and needs, professionals in steel structure engineering tell us that there are 4 kinds of welding methods commonly used in steel structure. The following is a detailed explanation:
1. Manual arc welding: This is a commonly used welding method. The manual arc welding equipment is simple, the operation is flexible and convenient, and it is suitable for welding in any space, especially for welding short welds. However, the production efficiency is low, the labor intensity is high, and the welding quality has a great relationship with the technical level and mental state of the welder.
2. Automatic or semi-automatic submerged arc welding (arc welding): Submerged arc welding is an arc welding method in which the arc burns under the flux layer.
The welding wire of submerged arc welding is not coated with coating, but the welding end is covered by the granular flux flowing down automatically from the flux leakage head. Welding with high productivity. Due to the automatic or semi-automatic operation, the welding process conditions are stable and the chemical composition of the weld is uniform, so the quality of the welded seam is good and the deformation of the weldment is small. At the same time, the high welding speed also reduces the size of the heat affected zone. However, the assembly accuracy (such as gap) of the edge of the weldment in submerged arc welding is higher than that in manual welding.
3. Gas shielded welding: Gas shielded welding is an arc fusion welding method that uses carbon dioxide gas or other inert gas as a protective medium. It directly relies on the shielding gas to create a local protective layer around the arc to prevent the intrusion of harmful gases and ensure the stability of the welding process. There is no slag in the welding seam melting area of gas shielded welding, and the welder can clearly see the welding seam forming process; because the shielding gas is sprayed, it helps the transfer of the droplets; and because of the heat concentration, the welding speed is fast, and the weldment The penetration depth is large, so the formed weld has higher strength than manual arc welding, good plasticity and corrosion resistance, and is suitable for welding in all positions. But it is not suitable for welding in windy places.
4. Resistance welding: Resistance welding is to use the heat generated by the current through the surface resistance of the contact point of the weldment to melt the metal, and then press it to weld it. Resistance welding is only suitable for welding with a stack thickness of not more than 12mm. For cold-formed thin-walled steel components, resistance welding can be used to join components with a wall thickness not exceeding 3.5mm.
The welding effect brought by different welding methods is different, which can be selected according to the specific situation. Only by operating properly and paying attention to certain details can we better ensure the welding quality and the quality of the steel structure.
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