Can welded tube be bent?

Welded steel tube(such as stainless steel welded tube ) can be bent, but factors such as the strength and toughness of the material need to be considered.

What are the 4 methods of pipe bending?

1. Manual bending

Use manual or mechanical force to bend the welded pipe(such as ERW pipe). This method is suitable for welded pipes with smaller diameters and thinner wall thicknesses, and requires experienced operators to operate.

2. Heating and bending

By heating a part or the entire welded pipe to soften it, and then applying force with a tool to bend it. Flame heating can be used for heating. Common methods include flame spray guns and torches. This method is suitable for welded pipes with smaller diameters and thinner wall thicknesses, but attention needs to be paid to controlling the heating time and temperature to avoid deformation or cracking of the welded pipes caused by overheating.

3. Cold roll bending

Use rollers to flatten the steel pipe, and adjust the position and angle of the rollers to bend the steel pipe. This method is suitable for steel pipes with larger diameters and thicker walls, which require larger equipment and operating space during operation.

4.Sand fill bending

Fine sand or other materials are filled into the inside of the steel pipe, and then bent on the welded pipe by applying force. This method is suitable for welded pipes with larger diameters and thicker walls, and can achieve different bending angles by adjusting the position and amount of filler material.

What is the rule for pipe bending?

1. Precautions for making cold bent pipes

a. When bending the pipe, it must be performed under the pressure value specified by the equipment.

b. The pipe should be leveled before the first bend, and the error should not be greater than 0.1°.

c. During the pipe bending process, the front and rear positions of the mandrel should be accurate, and the error should not be greater than 5mm, and the mandrel should be fully supported.

d. If the pipe is found to be deflected during the bending process, it should be adjusted in time.

e. The cold-bent pipe production record should be carefully filled in during and after the bending is completed.

f. After the pipe bending is completed, the mandrel should be restored to its original shape to prevent the main board from deforming due to force.

2. Precautions for making hot bent pipes

a. Control temperature and time

The key to hot bending processing is to control the heating temperature and heating time. If the heating temperature is too high or the heating time is too long, it will cause overheating and scorching of the metal material, affecting the mechanical properties of the material. If the heating temperature is too low or the heating time is too short, the metal material cannot achieve sufficient plasticity and the bending operation cannot be completed. Therefore, when performing hot bending processing, it is necessary to reasonably select the heating temperature and heating time according to the type and specifications of the metal material to ensure that the metal material reaches an appropriate heating state.

b. Consider the cooling and rebound of the material

The hot bending process also needs to consider the cooling and rebound issues of the material. After the metal material is bent, it needs to cool to solidify the material's shape. The cooling method can be natural cooling, water cooling or air cooling, etc. Choose the appropriate cooling method according to the specific situation. At the same time, because metal materials will produce a certain elastic recovery after being stressed, the materials need to be bent according to the required shape to compensate for the impact of springback.

c. Pay attention to safety

The hot bending process also requires attention to safety issues. When performing heating and bending operations, attention must be paid to preventing fire and scalding to avoid accidents. At the same time, appropriate personal protective equipment, such as protective glasses, protective gloves, etc., needs to be used to ensure the safety of operators.

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