1. All power terminal wiring must be performed by a qualified electrician. In case of any welding or power line issues, the welder should immediately contact a licensed electrician for assistance.
2. Welders must wear appropriate personal protective equipment (PPE), including specialized protective clothing, insulated shoes, and gloves that meet safety standards. Sleeves should not be rolled up, and protective masks must be worn to prevent eye injuries. Before starting work, all flammable, hazardous, or explosive materials must be removed from the area, and any pressure within containers or pipes must be released to ensure they are not sealed (e.g., by opening the cap).
3. Before beginning any welding activity, check the surrounding area for flammable materials. If found, remove them or implement reliable isolation measures and assign a dedicated person to monitor the site.
4. When working at heights, a designated person must manage the power supply and braking system. After cutting off the power, conductors should be lifted using ropes and never carried or crossed from above.
5. Avoid performing open-air welding in rainy, snowy, or windy conditions. If necessary, take precautions such as rain protection, insulation against electric shocks, and controlling sparks.
6. During welding, the welder must avoid touching the welding object or any other conductive surfaces.
7. Other maintenance personnel should stay away from the head area of the structure. Sealed containers must not be welded under any circumstances.
8. The welder must remain insulated from the workpiece, and the surroundings of the container must be monitored by a responsible person.
9. After completing the welding, isolate the area or assign a guard to prevent burns and potential fire hazards.
10. At the end of the shift, inspect the ground for any remaining embers, extinguish all fires, and turn off the power before leaving the site.
11. Before starting work, the welder must inspect the flashback arrestor and all tools to ensure they are in good condition. All fasteners on acetylene cylinders, gas bottles, hose connections, and valves must be secure and free from leaks, cracks, or looseness. Oxygen cylinders and their accessories must not come into contact with oil or grease.
12. Oxygen and acetylene hoses must be checked for leaks, aging, bulging, or deterioration before use. They should be kept clean and free from foreign objects. Never interchange oxygen and acetylene hoses.
13. Prior to starting work, ensure there are no flammable materials nearby. If present, remove them or implement proper isolation and monitoring measures.
14. Before connecting the oxygen pressure gauge, use a special wrench to slightly open the oxygen cylinder valve, release a small amount of oxygen to clear dirt from the valve, then close it again. Personnel should stand to the side during this process and avoid facing downward when opening the valve.
15. Acetylene and oxygen cylinders should be placed vertically to prevent tipping. They must not be stored near heat sources, electrical equipment, or flammable items. A minimum distance of 10 meters from open flames is required.
16. When opening oxygen or acetylene cylinder valves, do not strike them with metal tools. Use only the correct tools, operate slowly to prevent sparks, and avoid standing directly in front of the regulator.
17. Before igniting the torch, quickly open the welding torch valve and use oxygen to blow out the nozzle. Avoid doing this in windless conditions and never aim the flame toward your face while testing airflow.
18. To ignite, slightly open the oxygen valve first, then the acetylene valve. When finishing, close the acetylene valve first, followed by the oxygen valve to prevent backfire. If a sudden explosion or vibration occurs during welding, immediately shut off the acetylene valve and allow the torch to cool before repairing it. Never throw an ignited torch around, and if necessary, extinguish the flame properly.
19. When working on machines or at heights, install a safety shield beneath the cutting area to prevent molten metal from falling and causing fires or burns to others.
20. Ensure that fire-fighting equipment is available and in good condition. There should be at least two dry powder fire extinguishers nearby. After completing the cutting task, thoroughly check the ground for any remaining sparks or embers.
21. Do not completely empty the oxygen cylinder. Leave at least 1–2 atmospheres of gas inside to maintain pressure and safety.
22. Maintain a minimum distance of 10 meters between the oxygen cylinder and any open flame source.
Welders must follow these guidelines when handling and using acetylene cylinders:
23. The ambient temperature during storage and transportation of acetylene cylinders should not exceed 40°C. Keep them away from heat sources, electrical equipment, and direct sunlight. Maintain a minimum distance of 10 meters from open flames.
24. For mobile work sites, acetylene cylinders should be placed on a dedicated cart. Never store them together with oxygen cylinders or other flammable materials.
25. Always install a pressure regulator and flashback arrestor before use. When opening the valve, the operator should stand to the side of the valve and perform the action gently.
26. Do not completely empty the acetylene cylinder. Maintain a minimum pressure of 1 bar to ensure safe handling.
27. It is strictly prohibited to store acetylene cylinders together with oxygen cylinders or other flammable substances.
28. Before using an oxygen cylinder, check that it has a base, shock-absorbing rubber ring, and a safety cap. It should clearly be marked as "Oxygen" and should not be stored with other types of gas cylinders.
29. When handling oxygen cylinders, always secure the safety cap and handle them carefully to avoid dropping or rolling. Never transport them with flammable oils or greases.
30. In winter, extra care must be taken to prevent impacts or vibrations that could cause brittle fractures in the cylinder.
China Labor Insurance Network
An analytical balance is a highly precise laboratory instrument used to measure the mass or weight of samples with high accuracy and precision. It is commonly used in analytical chemistry, pharmaceuticals, and other scientific fields where precise measurements are required. Analytical balances typically have a readability of 0.1 milligrams (0.0001 grams) or less and are designed to minimize external factors that may affect the measurement, such as air currents and temperature fluctuations. They often use a draft shield to protect the sample from external influences and have a built-in calibration system to ensure accurate readings. Analytical balances can be operated manually or electronically, and some models are equipped with advanced features such as automatic calibration, data storage, and connectivity to a computer or other devices.
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Lachoi Scientific Instrument (Shaoxing) Co., Ltd. , https://www.lachoinst.com