Welders Should Remember These 26 Gas Cutting Experiences

To become a qualified and skilled flame cutting welder, please remember the following 26 items:

1. Only copper wire or bamboo stick shall be used as a penetration welding nozzle, and iron wire is prohibited.

2. Select the appropriate welding torch, cutting torch, welding nozzle, and cutting nozzle based on the thickness of the workpiece. Avoid cutting thick metal with the welding torch, and use a small cutting nozzle for cutting thick metal.

3. When connecting welding and cutting torches, ensure they are firmly connected with the oxygen belt. The acetylene inlet connector should not be too tightly connected with the acetylene belt. It is better to have an airtight connection that is easy to connect. Do not use the pipe strip burnt during aging and tempering.

4. When using an acetylene cutting machine, release the acetylene gas first and then the oxygen for ignition.

5. There should be enough clean water available at the worksite for cooling the welding nozzle.

6. During short rests, close the valves of welding and cutting torches tightly, and do not place them on the ground. Extinguish the torches during longer breaks or when leaving the work area.

7. Operating welding and cutting torches with the pipe strip on the back is not allowed, and it is prohibited to use the flame of welding and cutting torches for lighting.

8. If the gas path or valve is found to be leaking during use, stop working immediately. Do not continue to use until the air leakage is eliminated.

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9. When the pipe belt passes through the pedestrian passage, it should be covered, and a safe distance should be maintained from the electrical circuit.

10. Welding and cutting sites must have proper ventilation, and when welding and cutting inside containers, mechanical ventilation must be used.

11. Oxygen and acetylene hoses should be strictly separated and must not be interchanged.

12. When igniting welding and cutting torches, the acetylene valve should be opened first, followed by the oxygen valve. When turning off the torches, the oxygen valve should be closed first, followed by the acetylene valve.

13. Oxygen cylinders, acetylene cylinders, pipe straps, welding torches, and cutting torches should not be in contact with oily substances.

14. After the operation, the switches on the oxygen cylinder and acetylene cylinder should be firmly closed. The site should be cleaned, the fire extinguished, and the power supply cut off after eliminating the waste heat of the weldment.

15. When using and storing acetylene cylinders, they should be kept upright to prevent acetone from flowing out and causing combustion and explosion. Once a horizontal acetylene cylinder is used, it must be stood upright for 20 minutes before use again.

16. The cylinder shall not be heated with a heat source whose temperature exceeds 40℃.

17. It is forbidden to carry oxygen cylinders on one’s shoulder. When there is no shockproof ring or the temperature is below -10℃, it is prohibited to move the oxygen cylinder by rolling it.

18. Oxygen and acetylene cylinders shall not be emptied, and there must be residual gas in them. The oxygen cylinder shall have a gauge pressure residual gas of no less than 0.1 MPa, and the acetylene cylinder must have a gauge pressure residual gas of 0.05-0.1 MPa.

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19. If the pressure reducer freezes during use, it shall be thawed with hot water or steam and never baked with flame or red iron. After heating the pressure reducer, blow off any residual water.

20. According to current standards, the oxygen hose used is blue, and the acetylene hose is red.

21. Wear goggles during gas welding and cutting operations.

22. The cylinder valve of the acetylene cylinder shall be opened slowly, not more than one and a half turns, and generally only one quarter turn.

23. Combustible materials, such as cotton, hemp rope, or general rubber, shall not be used as sealing gaskets for oxygen pressure reducers.

24. Pressure relief sequence of the pressure reducer: first, close the gas valve of the high-pressure gas cylinder, then discharge all the residual gas in the pressure reducer, and loosen the pressure regulating rod to make the gauge needle drop to zero.

25. The positioning standard of the low-pressure gauge of the oxygen pressure reducer is 0.3-0.5 MPa.

26. The positioning standard of the low-pressure gauge of the acetylene pressure reducer is 0.03 MPa.

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