SSAW steel pipe is a welded steel pipe made of strip steel coil as raw material, extruded at regular temperature, and welded by automatic double-wire double-sided submerged arc welding process. Generally used in welding into pipelines for fluid transportation, metal structures, steel pipe pile, etc. Appearance inspection is a simple and widely used inspection method. It is an important part of the inspection of SSAW pipe products. It is mainly to find defects on the weld surface and dimensional deviations.
Appearance quality inspection is usually carried out in the following ways:
1. From the surface of the spiral steel pipe, it can be seen whether the production and processing technology of the spiral steel pipe is exquisite. Generally speaking, a good spiral steel pipe company will be careful in the production and manufacturing, and it is not easy to have some friction defects. The cross-section of the counterfeit and shoddy product spiral steel pipe is oval, the reason is that the manufacturer is convenient to save raw materials, and the reduction amount of the first two passes of the product output roller is slightly larger. The tensile strength of this type of spiral steel pipe is greatly reduced, and it does not meet the standards of rebar specifications.
The composition of high-quality spiral steel pipe is uniform, the tonnage of the cold shearing machine is high, and the internal thread of the cutting head is clean and tidy. However, due to the poor raw materials of fake and inferior products, the internal thread of the cutting head often has slag, that is, unevenness, and No metallic luster. And because the counterfeit and inferior product material manufacturers have less cutting heads, burrs will appear at the head and tail.
2. Beat the metal steel pipe. If the sound is very brittle and the echo is not very dirty, it means that the spiral welded pipe is a new factory, not a recycled waste spiral pipe.
3. Use tools such as standard templates, gauges and magnifying glasses for inspection. If there is a defect on the surface of the weld, there is a possibility of a defect inside the weld.
However, the quality of the spiral tube is not determined by whether the appearance is qualified or not, but is also restricted by the requirements of rigid indicators such as physical properties and strength properties. Therefore, when purchasing, the relevant sales department is also required to issue inspection certificates, etc.
Appearance quality inspection is usually carried out in the following ways:
1. From the surface of the spiral steel pipe, it can be seen whether the production and processing technology of the spiral steel pipe is exquisite. Generally speaking, a good spiral steel pipe company will be careful in the production and manufacturing, and it is not easy to have some friction defects. The cross-section of the counterfeit and shoddy product spiral steel pipe is oval, the reason is that the manufacturer is convenient to save raw materials, and the reduction amount of the first two passes of the product output roller is slightly larger. The tensile strength of this type of spiral steel pipe is greatly reduced, and it does not meet the standards of rebar specifications.
The composition of high-quality spiral steel pipe is uniform, the tonnage of the cold shearing machine is high, and the internal thread of the cutting head is clean and tidy. However, due to the poor raw materials of fake and inferior products, the internal thread of the cutting head often has slag, that is, unevenness, and No metallic luster. And because the counterfeit and inferior product material manufacturers have less cutting heads, burrs will appear at the head and tail.
2. Beat the metal steel pipe. If the sound is very brittle and the echo is not very dirty, it means that the spiral welded pipe is a new factory, not a recycled waste spiral pipe.
3. Use tools such as standard templates, gauges and magnifying glasses for inspection. If there is a defect on the surface of the weld, there is a possibility of a defect inside the weld.
However, the quality of the spiral tube is not determined by whether the appearance is qualified or not, but is also restricted by the requirements of rigid indicators such as physical properties and strength properties. Therefore, when purchasing, the relevant sales department is also required to issue inspection certificates, etc.
