How to weld galvanized steel?

Galvanized pipe is a common pipe material commonly used in construction, machinery manufacturing and electrical equipment. It has good corrosion resistance and strength, but requires welding during use. The following is a detailed introduction to galvanized pipe welding techniques.

1. Preparation work before welding

(1)Clean the surface: During the processing of galvanized pipes, there will be a layer of zinc covering the surface, which needs to be cleaned to avoid affecting the welding.

(2)Prepare tools: Welding requires preparing appropriate welding equipment and tools, including welding machines, pliers, brushes, etc.

(3) Check the pipes: Before welding, you need to check whether the quality and size of the pipes meet the requirements to avoid problems during the welding process.

2. Selection of welding methods

(1)Welding methods: Commonly used welding methods include arc welding, gas shielded welding, TIG welding, etc. Among them, arc welding is the most commonly used method and is suitable for thicker pipes. However, if the thickness of the pipe is thin, gas shielded welding or TIG welding can be selected.

(2) Welding position: When welding galvanized pipes, the position and angle of the pipe need to be considered to avoid deformation or weak welding.

3. Welding operation skills

(1)Selection of welding materials: The selection of welding materials should be based on the material and requirements of the pipe. Generally, welding rods with the same material as the pipe can be selected.

(2) Control of welding current: When welding, it is necessary to control the size of the welding current. Generally, the welding current should be controlled within an appropriate range to avoid excessive heat generated during the welding process, resulting in pipe deformation or improper welding. firm.

(4)Control of welding speed: When welding, the welding speed needs to be controlled. Under normal circumstances, the welding speed should be moderate. Too fast will cause the welding to be weak, and too slow will cause the pipe to deform.

(5)Selection of welding position: When welding, you need to choose a suitable welding position. Generally, choosing to weld at both ends of the pipe can ensure the firmness and beauty of the welding.

(6)Treatment after welding: After welding, the welding joint needs to be processed. You can use a grinding wheel or brush to remove welding slag and impurities, and then polish it to achieve a smooth and beautiful effect.

In general, the welding of galvanized pipes requires sufficient preparation, selecting appropriate welding methods and materials, controlling the welding current and speed, selecting the appropriate welding position, and then processing the welding joint to achieve good welding Effect.

Related knowledge of galvanized pipes

Galvanized pipe(such as ERW galvanized welded steel tube), also known as galvanized steel pipe, refers to a layer of zinc plated on the surface of the steel pipe. It is generally divided into two types: hot-dip galvanizing and electro-galvanizing. Hot-dip galvanizing has a thick galvanizing layer, strong adhesion, and long service life; electro-galvanizing has low cost, the surface is not very smooth, and its corrosion resistance is much worse than hot-dip galvanizing pipes.

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