What harm does argon arc welding of stainless steel do to the body?

There are three harmful factors affecting human body in argon arc welding:

1, radioactivity

Thorium in thorium-tungsten electrode is a radioactive element, but the radiation dose of thorium-tungsten electrode is very small during argon tungsten arc welding, which is within the allowable range and has little harm. If radioactive gas or particles enter the human body as radioactive sources in the body, it will seriously affect the health of the body.

2. High frequency electromagnetic field

When using high frequency arc ignition, the intensity of high frequency electromagnetic field is between 60 ~ 1 10V/m, which is several times higher than the reference hygienic standard (20V/m). However, due to the short time, it has little impact on the human body. If the arc is started frequently, or the high-frequency oscillator is used continuously as the arc stabilizer during welding, the high-frequency electromagnetic field can become one of the harmful factors.

3. Harmful gases-ozone and nitrogen oxides

During argon arc welding, the temperature of arc column is high. The intensity of ultraviolet radiation is much greater than that of ordinary arc welding, so a lot of ozone and nitrogen oxides will be produced in the welding process; In particular, the concentration of ozone far exceeds the reference health standard. If effective ventilation measures are not taken, these gases have great influence on human health and are the most important harmful factors in argon arc welding.

Extended data:

Hazards of welding smoke:

Argon arc welding is mainly used for welding aluminum and aluminum alloys, copper and copper alloys, magnesium and magnesium alloys, titanium and titanium alloys, superalloys, etc. It is widely used in many important industrial sectors. Besides electric shock, burn and fire similar to covered electrode arc welding, argon arc welding also has high-frequency electromagnetic field, electric shock radioactivity and arc damage much stronger than arc welding.

Disadvantages:

1. Due to the large heat affected zone, argon arc welding often causes defects such as deformation, hardness reduction, sand holes, local annealing, cracking, pinholes, wear, scratches, undercut, or insufficient bonding force and internal stress damage after repair. Especially in the process of repairing small defects of precision castings, the surface is prominent.

In the field of precision casting defect repair, cold welding machine can be used instead of argon arc welding. Due to the small heat release of cold welding machine, the shortcomings of argon arc welding are well overcome and the repair problem of precision castings is made up.

2. Compared with covered electrode arc welding, argon arc welding is more harmful to human body. Argon arc welding has high current density and strong light ratio. The ultraviolet radiation generated by its arc is about 5 ~ 30 times that of ordinary covered electrode arc welding.

The infrared ray is about 1 ~ 1.5 times that of covered electrode arc welding, and the ozone content produced during welding is high. So try to choose a place with good air circulation for construction, otherwise it will do great harm to the body.

3. For metals with low melting point and easy evaporation (such as lead and tin). Zinc), welding is difficult.

Advantages:

1, argon protection can isolate the adverse effects of oxygen, nitrogen and hydrogen in the air on the arc and molten pool, reduce the burning loss of alloy elements, and obtain dense, splash-free and high-quality welded joints.

2. Argon arc welding has the advantages of stable arc combustion, concentrated heat, high arc column temperature, high welding production efficiency, narrow heat affected zone, and low stress, deformation and crack tendency of welded parts.

3. Argon arc welding is open arc welding, which is convenient for operation and observation.

4, the electrode loss is small, the arc length is easy to maintain, there is no flux and coating during welding, and it is easy to realize mechanization and automation.

5. Argon arc welding can weld almost all metals, especially some refractory metals and oxidizable metals, such as magnesium, titanium, molybdenum, zirconium, aluminum and their alloys.

6, not limited by the position of weldment, all-position welding can be carried out.

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