Safety in arc welding
Because there are many advantages such as easy welding, manipulation in any position, cheap equipment, hand arc welding is the method is widely used today. When using arc welding machine, there are many factors that are harmful to workers such as welding fumes, radiation, and the temperature of the arc flames, electric shocks, metal burns, and so on. Getting into welding, the welder should note issues such as:
Protect eyes and skin from direct exposure to arc light
The workplace must be ventilated, preferably with a vacuum system in the welding workshop,
Keep distance from molten welds, avoid molten metal splashing into the solder by using appropriate protective gear
Care should be taken when tapping the slag as it is still hot and can damage sensitive areas.
Avoid the radiation of the arc flames
The fire of the arc when welding the hand is very strong radiation, only short-term exposure can damage the skin (red, flaking …) or can cause corneal burns, Cause irritation, greatly affect the health and work efficiency of the welder.
Using a solder mask is an effective solution. There are usually two types of solder masks, a fixed dark mask, and a photo-sensitive mask. The fixed dark mask is cheap but has many inconveniences when used, the sensor mask is higher price but very convenient when soldering.
Solder mask with fixed darkness
Effects of welding smoke
The air is called “fresh”. If 1 m3 of clean air contains less than 5mg of welding smoke, in reality, the welding volume is much larger.
Depending on the type of cigarette smoked, the amount of smoke produced varies, for example the smoke of the E 6013 electrodes is less harmful than the smoke of the E 7018 electrodes, but more or less frequent inhalation will cause great harm. For the health of the welder. The best advice is to limit the exposure as much as possible, the work area must be ventilated, and the workman should protect his face well.
When welded stainless steel, surface hardening alloys, some fluorinated coated electrodes, cast iron welding rod … should use helmets with breath air. Welders and production managers always need to refer to the recommendations of the weld material manufacturer for the most reasonable protection measures for the welders.
Be careful of the splashes of molten metal and welding slag
When welding the arc there are a lot of sparks splashing around, especially for beginners. Do not stay too close to the molten weld. Sparks that cause fires and clothing and are very troublesome if they fall into the neck or shoes. Workers should wear specialized protective clothing such as clothing, leather aprons, head should be combined with welding mask mask.
The welding position around the needle is clean and does not include flammable agents. It is necessary to arrange a fire extinguisher near the welding area in case of fire.
Precaution against electric shock
With a DC Arc welding machine with no load voltage of about 80V, the no-load voltage of the AC welding machine is in the range of 80V, especially the machine up to 100V so the ability of the electrician to electric shock in the process of welding completely. can happen. So before welding, the operator should check the details such as:
– Are the cables frayed?
– The contacts must be close contact and sure,
– Solder pliers must be dry and insulated, good insulation,
– wearing gloves when welding,
In this case, electric shock is less likely to be fatal, but it is dangerous if the operator is high or underwater.