What do you know about the secrets behind welding steel pipes

First, the importance of weld seam treatment for welded steel pipes.

Weld seam treatment is a crucial step in ensuring the quality of welded steel pipes. Generally, welded steel pipes have defects such as welding flaws, porosity, and cracks. If these are not addressed promptly, the strength and sealing of the weld seam will be affected, shortening the service life of the welded steel pipe and even compromising safety.

Second, the steps of weld seam treatment for welded steel pipes:

1. Cutting: For uneven weld seams or those with porosity, tools such as an angle grinder are needed to cut them out. The cut weld seam should be smooth, free of porosity and foreign objects, facilitating subsequent processing.

2. Grinding: The cut weld seam surface is ground to remove burrs and sharp edges from the cutting process, preventing new defects. Tools such as grinding wheels and electric angle grinders can be used for grinding.

3. Filling: Filling is an important step in repairing weld seam defects and improving weld quality. The filler material should be the same as or similar to the material of the welded steel pipe. Before filling, the weld seam of the welded steel pipe should be derusted. Then, the filler material should be evenly heated to its melting point and applied to the weld seam. After the filler material solidifies, it should be ground.

Third, what are the welding methods for welded steel pipes?

There are welding methods such as shielded metal arc welding (SMAW), submerged arc welding (SAW), and gas metal arc welding (GMAW). Before SMAW, the bevels of the two steel pipes should be cleaned, and then the bevels should be evenly heated with a manual arc welding torch. Then, the welding rod should be placed and welded with the arc welding torch. Next, a second welding is performed on top of the base weld.

Fourth, what should be noted when using welded steel pipes?

1. There are various types of welded steel pipes, including spiral steel pipes, straight seam steel pipes, galvanized steel pipes, and stainless steel pipes. When using welded steel pipes, different types should be selected according to the application. For example, straight seam steel pipes can be used for load-bearing columns in steel structures such as buildings and dams, but spiral steel pipes cannot be used. Stainless steel pipes should be used for tap water, not galvanized steel pipes, etc.

2. When using welded steel pipes, it is often necessary to connect two pipes. There are various connection methods for steel pipes; we connect them using flanges or welding. Before welding, we need to check for misalignment or other problems and clean any oil or dirt from the surface promptly. During welding, we should move the welding torch evenly to ensure a smooth weld. The welding current should not be set too high or too low, otherwise it will affect the weld quality.

3. Before using welded steel pipes and other steel materials, we need to take appropriate storage measures. For example, welded steel pipes should not be stored in damp places. When storing welded steel pipes, we should not place them directly on the ground; we can place them on wooden blocks first. Corrosive substances should not be placed in the storage area for welded steel pipes.