The Correct Method of Hydraulic Tube Welding

Hydraulic tubes are an important part of the hydraulic system and are used to transmit hydraulic oil or other liquid media. In practical applications, there are many ways to connect hydraulic tubes, among which welding is a common choice. Through welding, a firm connection between pipes can be achieved to ensure the normal operation of the hydraulic system. In many industrial fields, involving the manufacture and application of seamless pipes and carbon steel pipes, hydraulic tube welding technology is particularly important.

Welding methods for hydraulic tubes

1. Argon arc welding

Argon arc welding, also known as TIG welding, is a high-quality welding method. It uses inert gas argon as a shielding gas to prevent the welding area from being oxidized. This method is suitable for hydraulic tubes of various thicknesses, especially thin-walled pipes.

During the welding process, the cleanliness of the weld should be ensured to avoid the generation of slag inclusions and pores.

2. MIG welding

MIG welding is a semi-automatic gas shielded welding method. Compared with argon arc welding, MIG welding is more suitable for welding thicker hydraulic tubes. It uses inert gas (such as argon or carbon dioxide) as a shielding gas and feeds the welding wire into the welding area through a wire feeding mechanism. MIG welding is often used in the welding of supporting hydraulic tubes for some large drill pipes and octg pipes.

During the welding process, a stable welding speed and current should be maintained to ensure the uniformity and strength of the weld.

3. Flame welding

Flame welding is a traditional thermal welding method suitable for welding thicker hydraulic tubes. However, this method requires higher skills and experience because the control of welding temperature is crucial.

Too high a temperature may cause thermal deformation or damage to the pipe, while too low a temperature may cause the weld to not be fused. Therefore, when using flame welding, special attention should be paid to controlling the welding temperature.

4. Resistance welding

Resistance welding is a method of welding by generating heat through the surface of the workpiece by passing an electric current through it. This method is suitable for welding thinner hydraulic tubes because it can generate a lot of heat in a short time, thereby achieving rapid welding.

During the resistance welding process, it should be ensured that the contact between the workpieces is good so that the current can pass smoothly and generate enough heat.

Specific steps for hydraulic tube welding

1. Determine the pipeline preparation;

2. Select appropriate welding materials and methods;

3. Perform pre-welding preparations, including pipeline cleaning, cutting, heating and accurate alignment;

4. Start welding, pay attention to controlling the welding temperature and time;

5. After welding is completed, perform quality inspections, such as flaw detection, pressure testing, etc.

Precautions for hydraulic tube welding

1. Ensure that the inside and outside of the pipeline are clean before welding, especially the inside;

2. Ensure that the pipeline is in the correct position during welding and that the welding position is not disturbed by external forces;

3. Ensure that appropriate welding materials and methods are selected;

4. Carefully observe the changes during welding to ensure the stability of the weld;

5. Control the welding temperature and time to avoid deformation or cracks of the pipeline;

6. After welding is completed, ensure that the weld is fully free of pores and inclusions, and perform necessary quality inspections.

It is worth noting that hydraulic tubes with smaller diameters can be connected by welding, but hydraulic tubes with larger diameters are generally connected by pipe flanges or ferrules.

Welding skills

1. Heat the pipe before welding to prevent the pipe from being ruptured by thermal stress;

2. Ensure that the welding surface is smooth and avoid oxidation or corrosion;

3. Avoid too many welding areas to avoid causing too much impact on the pipe;

4. Do not weld if large defects, potholes and undetectable internal impurities are found in the pipe;

5. When welding the pipe, be careful not to let the welding line pass through sensitive areas to avoid affecting the use of the pipe.

Summary

Hydraulic tube welding is a commonly used processing method in hydraulic systems. Using appropriate welding materials and methods, and paying attention to prior preparation and welding skills can ensure the quality and reliability of welding. For the selection of hydraulic tubes and the connection method of the pipes, it is also necessary to make reasonable choices according to the actual situation to improve the use effect and safety of the hydraulic system.

Read more: Joint Models of American Seamless Hydraulic Piping or Difference between seamless pipe and seam pipe