how to weld carbon steel pipe?

Welding method of carbon steel pipe

1. Welding method of carbon steel pipe

Carbon steel pipes can be connected by a variety of welding methods, the most common of which are manual arc welding, submerged arc welding and gas shielded welding.

1. Manual arc welding

Manual arc welding is one of the most basic welding methods. The utility model has the advantages of simple operation and low cost, and is suitable for occasions where the welding quality is not required. When welding carbon steel pipes, the corresponding electrode needs to be selected and adjusted according to the actual situation of the pipe. The disadvantage of manual arc welding is that the welding speed is slow and the accuracy is low.

2. Submerged arc welding

Submerged arc welding is a semi-automatic welding method, which is suitable for long-term continuous welding. Submerged arc welding uses a large type of electrode, which can improve welding speed and production efficiency. Compared with manual arc welding, submerged arc welding can improve the welding quality and sealing of the weld and reduce the thermal deformation, but it also needs to be adjusted for specific welding projects.

3. Gas shielded welding

Gas shielded welding, also known as argon arc welding, is one of the advanced ways to weld carbon steel pipes. The gas protectant used in argon arc welding can protect the molten pool from oxidation. In addition, the inertia of argon can also protect the arc from interference, making the welding quality higher. Compared with other welding methods, argon arc welding requires a higher technical level and equipment investment, and the cost is relatively high.

Second, carbon steel pipe welding materials

Different carbon steel pipes require different welding materials. At present, the common welding materials on the market are steel cored wire, coated electrode, coated electrode and so on. Among them, the coated electrode is used for manual arc welding, the steel-cored wire is used for submerged arc welding and gas shielded welding, and the steel-cored coated electrode is an intermediate type combining the advantages of the first two kinds of welding materials.

Third, precautions

1. Before welding, the surface of the carbon steel pipe needs to be polished and cleaned to ensure the quality of welding.

2. In manual arc welding, it is necessary to select the correct welding current and welding electrode diameter.

3. In gas shielded welding, it is necessary to cover the perimeter of the weld to ensure the effectiveness of gas protection.