What safety precautions should be paid attention to when welding stainless steel ventilation pipes?

Pay attention to the following safety precautions when welding stainless steel ventilation pipes:

First, the welding environment preparation

Ensure the welding site is well ventilated.

Ventilation can exhaust harmful gases and dust generated in the welding process in time, such as ozone, carbon monoxide, metal dust, etc., to avoid poisoning caused by inhalation of these harmful substances by operators. Good ventilation can also reduce the concentration of flammable and explosive gases and reduce the risk of fire and explosion. Ventilation equipment, such as exhaust fans and ventilation pipes, can be installed to ensure air circulation.

Clean up the flammable materials around the welding site.

During the welding process, high-temperature sparks and slag will be generated. If there are flammable materials around, such as paper, wood and cloth, it is easy to cause a fire. Before welding, the surrounding flammable materials should be cleaned to a safe distance, generally at least 5 meters away from the welding point. At the same time, we should also pay attention to check whether there is flammable liquid on the ground, and clean it up in time if there is.

Second, personal protective equipment

Wear appropriate welding protective clothing.

Including work clothes, gloves, shoes, etc. Work clothes should be made of fireproof and heat-resistant materials, such as cotton or flame-retardant fibers, which can effectively block sparks and heat radiation. Gloves should be heat-resistant and wear-resistant welding gloves to protect hands from high temperature, sparks and sharp objects. Welding shoes should have the functions of smashing resistance, heat resistance and insulation to ensure the safety of feet.

Wear protective glasses and a mask.

When welding, strong arc light will be generated, including ultraviolet rays, infrared rays and other harmful radiation to the eyes. Wearing protective glasses or masks can effectively block these radiations and protect eyes from injury. Protective glasses should be products that meet national standards, with good optical performance and impact resistance. The mask can provide more comprehensive protection, covering the whole face and preventing sparks and slag from splashing on the face.

Use earplugs or earmuffs to protect hearing.

Loud noise will be generated during welding, and long-term exposure to noise environment will damage hearing. Using earplugs or earmuffs can reduce the noise level and protect hearing. When choosing earplugs or earmuffs, we should pay attention to their noise reduction effect and comfort, so as to ensure that hearing can be effectively protected without affecting work efficiency.

Third, the welding equipment inspection

Ensure that the welding equipment is well grounded.

Grounding welding equipment is a very important safety measure, which can prevent electric shock accidents. Before using welding equipment, check whether the grounding wire is firmly connected and whether the grounding resistance meets the requirements. Generally speaking, the grounding resistance should be less than 4 ohms. If the grounding is poor, it should be rectified in time to ensure the safe operation of the equipment.

Check cables and plugs of welding equipment.

Check whether the cable is damaged or aging, and replace it in time if it is. The plug should be firmly connected without looseness. At the same time, we should also pay attention to whether the length of the cable is appropriate, so as to avoid too long or too short affecting the operation. Too long cables are easy to be wound, which increases the potential safety hazard; Too short a cable may limit the operating range and affect the working efficiency.

Debugging welding equipment parameters

According to the material and thickness of stainless steel ventilation pipe, the current, voltage and other parameters of welding equipment are correctly debugged. Improper parameter setting may lead to poor welding quality and even safety accidents. When debugging parameters, you can refer to the manual of welding equipment and the process requirements of stainless steel welding and make reasonable settings.

Four, welding operation specification

Strictly abide by the welding operation procedures

Operators should be familiar with the use methods and operating procedures of welding equipment and operate in strict accordance with the operating procedures. During welding, welding parameters and operation methods shall not be changed at will to ensure welding quality and safety.

Control welding speed and temperature

Too fast welding speed may lead to unstable welding and defects such as porosity and slag inclusion; If the welding speed is too slow, the heat input will be too large, causing problems such as deformation and burning through. The welding speed should be controlled reasonably according to the material, thickness and welding process requirements of stainless steel ventilation pipes. At the same time, we should also pay attention to controlling the welding temperature to avoid the phenomenon of phase transformation and embrittlement of stainless steel material caused by too high temperature.

Pay attention to welding sequence and method.

For large stainless steel ventilation pipes, reasonable welding sequence and method should be adopted to reduce welding deformation and stress. Sectional welding, symmetrical welding and other methods can be used to weld the main stress parts first and then the secondary parts. In the welding process, attention should be paid to keep the welded joint clean to avoid impurities from affecting the welding quality.

V. Emergency treatment measures

Equipped with fire fighting equipment

A sufficient number of fire-fighting equipment, such as fire extinguishers and fire-fighting sand, should be equipped near the welding site, so that the fire can be put out in time. Operators should be familiar with the use of fire-fighting equipment and regularly check the effectiveness of fire-fighting equipment.

Make an emergency plan

Formulate emergency plans for welding accidents, and define emergency handling procedures and division of responsibilities. In the event of a safety accident, effective measures can be taken quickly to deal with it and reduce accident losses. At the same time, emergency plan drills should be conducted regularly to improve the emergency handling ability of operators.