Carbon steel pipe welding technical requirements

Carbon steel pipe & tube welding technical requirements:

1) Preparatory work

Before welding carbon steel pipes, the following preparatory work is required:

1. Clean the surface of the pipe: Since some dust and grease may adhere to the outer surface of the carbon steel pipe, it is necessary to use tools such as pickling or wire brush to scrape off the attachment on the surface of the pipe to ensure that the surface of the pipe is clean and the welding quality is high.
2. Welding equipment: Inverter DC welding machine is used for welding, and cable wiring needs to be carried out in advance to ensure the safety and stability of the power supply.
3. Selection of welding rods or wires: Choose welding rods or wires of different materials and specifications according to the requirements of the pipeline material and usage scenarios.

4. Preheating: By heating, around the weld position to reduce and prevent the occurrence of cold cracks.

2) Equipment requirements

When welding carbon steel pipes, inverter DC welding machines, cables, hand-held gas cylinders and other equipment are required.

1. Inverter DC welding machine: suitable for arc welding of carbon steel pipes.
2. Welding cable: Receive the power output of the inverter DC welding machine, and transmit the current to the welding rod/wire.
3. Hand-held gas cylinder: Inert gas needs to be used during welding to protect the molten pool from air oxidation and improve the quality of the weld.

3) Welding technical requirements

1. Welding position: The welding position is required to be clean, free of oil, water, rust and other impurities in order to ensure the welding quality.
2. Welding angle: The choice of welding angle should be determined according to the shape and angle of the pipe.
3. Welding speed: The welding speed should be determined according to the specifications of the pipe and the mixing ratio of the ink.

4) Welding parameter adjustment

When welding carbon steel pipes, it is also necessary to adjust the welding parameters according to the material and specifications of the pipes to ensure the quality of the welding.

1. Welding current: Select an appropriate welding current that matches the electrode to ensure the quality of the weld.
2. Arc voltage: Controlling the arc voltage can affect the formation and depth of the weld pool.

3. Welding speed: During the welding process, the welding speed should be controlled to ensure the formation and extrusion of the weld pool.

5) Weld quality assessment

Weld quality assessment is an important means to detect whether the weld meets the standard requirements. The main evaluation criteria are appearance defects, size, shape, hardness, tensile properties, etc.

For low-alloy steel and high-strength steel, appropriate welding methods should be selected according to their physical properties and chemical composition to ensure welding quality.

The above is the relevant content of the welding technical requirements of carbon steel pipes. It is explained from various aspects such as preparation work, equipment requirements, welding technical requirements, welding parameter adjustment, weld quality evaluation, etc., aiming to provide some reference for everyone.