Sandblasting of seamless and welded pipes

What is sandblasting

Sandblasting is a surface treatment process for workpieces. Compressed air is used as power to form a high-speed jet beam to spray the spray material (copper ore, quartz sand, emery, iron sand, sea sand) at high speed onto the surface of the workpiece to be treated, causing the appearance or shape of the workpiece surface to change. Due to the impact and cutting effect of abrasives on the surface of the workpiece, the surface of the workpiece obtains a certain degree of cleanliness and different roughness, which improves the mechanical properties of the surface of the workpiece, thereby improving the fatigue resistance of the workpiece and increasing its and coating The adhesion between them extends the durability of the paint film and is also beneficial to the leveling and decoration of the paint.

Sandblasting treatment method for seamless and welded pipes

Sandblasting and shot blasting are collectively called sand blasting. According to the different sand blasting methods, there are relatively four classification methods:

1. Press-in sandblasting and suction sandblasting.

2.Dry sandblasting and liquid sandblasting.

3. Open sandblasting and box (room) sandblasting.

4. The above classifications of manual sandblasting and automatic sandblasting are only relative, such as open blasting and box sandblasting. These two types may also be press-in or suction-type, dry or liquid, manual or automatic, and others. Similar, with one exception: Press-in blasting will not be liquid blasting and vice versa. (Please refer to the product catalog) Sometimes there is also a concept called XX special sandblasting equipment, but it is relatively narrow, so it is not used as a classification method.

Advantages of Sandblasting Seamless and Welded Pipes

There is a layer of iron oxide on the surface of the steel. The bonding between the oxide scale and the matrix is poor. At the same time, their respective expansion coefficients are different, so they will peel off piece by piece, affecting the anti-corrosion effect. Sandblasting can not only completely remove rust, oxides and dirt on the surface of the steel pipe, Moreover, under the action of strong abrasives and friction, it can also achieve the uniform roughness required for anti-corrosion coatings. It also improves the adhesion between the mechanical anti-corrosion coating and the steel pipe surface, thereby greatly extending the service life of the anti-corrosion coating.

Sandblasting precautions

1. Protective equipment must be worn before work, and working with bare arms is not allowed. No less than two people should be working.

2. Gas storage tanks, pressure gauges, and safety valves must be calibrated regularly. The air storage tank is discharged with dust every two weeks, and the filter in the sand tank is inspected once a month.

3. Check whether the ventilation pipe and sandblasting machine door are sealed. Five minutes before work, the ventilation and dust removal equipment must be started. When the ventilation and dust removal equipment fails, the sandblasting machine is prohibited from working.

4. The compressed air valve should be opened slowly, and the air pressure should not exceed 0.8MPa.

5. The sandblasting particle size should be adapted to the work requirements, generally between No. 10 and No. 20, and the sand should be kept dry.

6. When the sandblasting machine is working, unrelated persons are prohibited from approaching it. When cleaning and adjusting the running parts, the machine should be stopped.

7. Do not use compressed air to blow dust on your body or make fun of you.

8. After the work is completed, the ventilation and dust removal equipment should continue to operate for five minutes and then shut down to discharge indoor dust and keep the site clean.

9. In the event of personal or equipment accidents, stay on-site and report to relevant departments.

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