Welding skills and requirements for spiral welded steel pipes

Welding skills and requirements for spiral welded steel pipes:

1) Material preparation
Before welding spiral welded steel pipes, it is necessary to process both sides of the weld to ensure that the edges are neat and parallel, without deviation or distortion, and to avoid deviation and other problems. The material surface should be clean to avoid dust, oil and other debris from affecting the welding quality. In addition, selecting appropriate welding materials is also one of the important factors to ensure welding quality.

2) Preheat

Preheating is required before welding to improve the plasticity and toughness of the material and avoid cracks and deformation caused by hot and cold shock. The preheating temperature is generally determined according to the material thickness and welding environment, and should follow the specified standards of the material.

3) Operation skills of spiral welded steel pipe
1. When welding, attention should be paid to controlling the welding current to avoid welding defects caused by being too high or too low.
2. Pay attention to the size and position of the weld to ensure that the size of the weld meets the design requirements and the position is accurate.
3. The welding speed should be moderate. Too fast will easily lead to poor weld quality, and too slow will produce waste.
4. Strictly control the temperature and humidity during the welding process to avoid the impact of environmental factors on the welding quality.

4) Welding quality
After welding is completed, the quality of the weld needs to be inspected to determine whether it meets the relevant standards. The main inspection indicators are as follows:
1. Whether the surface flatness and edge sharpness of the weld meet the requirements.
2. Whether the internal structure of fillet welds and transverse welds is tight and seamless.
3. Whether the welding strength meets the requirements and whether brittle failure and other defects occur.

In general, the welding requirements for spiral welded steel pipes are relatively strict, and it requires control of material preparation, preheating, operating skills, etc. to ensure welding quality. In actual operations, welding workers need to strictly implement relevant regulations to ensure that the welding quality meets the requirements.