the gases used in different types of welding would include

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Welding

What are welding fumes? Can the composition of welding fumes vary? How do coatings affect the composition of welding fumes?

Welding - Fumes And Gases

Welding - Fumes And Gases What are welding fumes?

Welding fumes are a complex mixture of metals metallic oxides, silicates and fluorides. Fumes are formed when a metal is heated above its boiling point and its vapours condense into very fine, particles (solid particulates). Welding fumes generally contain particles from the electrode and the material being welded.

Can the composition of welding fumes vary?

Yes, the composition of welding fumes is determined by the metals in the material being welded, the composition of the electrode, coatings, and other factors such as:

Fluxes containing silica or fluoride produce amorphous silica, metallic silicates and fluoride fumes.

Fumes from mild steel welding contain mostly iron with small amounts of additive metals (chromium, nickel, manganese, molybdenum, vanadium, titanium, cobalt, copper etc.).

Stainless steels can have larger amounts of chromium, including hexavalent chromium, or nickel in the fume and lesser amounts of iron.

Nickel alloys have much more nickel in the fume and very little iron.

How do coatings affect the composition of welding fumes?

Vapours or fumes can come from coatings and residues on metal being welded. Some ingredients in coatings can have toxic effects. These ingredients include:

metal working fluids, oils, and rust inhibitors

zinc on galvanized steel (vaporizes to produce zinc oxide fume)

cadmium plating chromates

vapours from paints and solvents

lead oxide primer paints

plastic coatings

Metal Coatings - A Source of Hazardous Fumes

How do I remove the coatings?

Remove coatings from the weld area to minimize the fume. The removal of coating will also improve weld quality.

Use stripping products to remove coatings. Make sure to remove any residues before welding.

Use wet slurry vacuum removal techniques for removing very toxic coatings.

Do not grind coatings. Grinding dust may be toxic.

Follow appropriate safety procedures and use the necessary personal protective equipment  during the coating removal process, which will be based on risk assessments, manufacturer’s instructions, and potential exposures.

What are the factors that affect worker exposure to welding fumes?

Type of welding process.

Composition of welding rod.

Filer metals and base metal used.

Type of coatings present.

Location (open area or confined space).

Type of ventilation controls (mechanical or local).

Work practices of welder (e.g. remove coatings, clean surfaces, proper positioning to avoid breathing fumes and gases, such as staying upwind when welding in open or outdoor areas).

What are welding gases?

Welding gases are gases used or produced during welding and cutting processes like shielding gases or gases produced by the decomposition of fluxes or from the interaction of ultraviolet light or high temperatures with gases or vapours in the air.

What are examples of welding gases?

Gases used in welding and cutting processes include:

shielding gases such as carbon dioxide, argon, helium, etc.

fuel gases such as acetylene, propane, butane, etc.

oxygen, used with fuel gases and also in small amounts in some shielding gas mixtures

Gases produced from welding and cutting processes include:

carbon dioxide from the decomposition of fluxes

carbon monoxide from the breakdown of carbon dioxide shielding gas in arc welding

ozone from the interaction of electric arc with atmospheric oxygen

nitrogen oxides from the heating of atmospheric oxygen and nitrogen

hydrogen chloride and phosgene produced by the reaction between ultraviolet light and the vapours from chlorinated hydrocarbon degreasing solvents (e.g., trichloroethylene, TCE)

Gases are also produced from the thermal breakdown of coatings:

Polyurethane coatings can produce hydrogen cyanide, formaldehyde, carbon dioxide, carbon monoxide, oxides of nitrogen, and isocyanate vapours.

Epoxy coatings can produce carbon dioxide and carbon monoxide.

Vinyl paints can produce hydrogen chloride.

Phosphate rust-inhibiting paints can release phosphine during welding processes.

Minimizing exposure to degreasing solvent vapours.

Table 1

Source and Health Effect of Welding Fumes

Fume Type Source Health Effect

Aluminum Aluminum component of some alloys, e.g., Inconels, copper, zinc, steel, magnesium, brass and filler materials. Respiratory irritant.

Beryllium Hardening agent found in copper, magnesium, aluminum alloys and electrical contacts. "Metal Fume Fever." A carcinogen. Other chronic effects include damage to the respiratory tract.

Cadmium Oxides Stainless steel containing cadmium or plated materials, zinc alloy. Irritation of respiratory system, sore and dry throat, chest pain and breathing difficulty. Chronic effects include kidney damage and emphysema. Suspected carcinogen.

Chromium Most stainless-steel and high-alloy materials, welding rods. Also used as plating material. Converts to hexavalent chromium during welding. Increased risk of lung cancer. Some individuals may develop skin irritation. Some forms are carcinogens (hexavalent chromium).

Copper Alloys such as Monel, brass, bronze. Also some welding rods. Acute effects include irritation of the eyes, nose and throat, nausea and "Metal Fume Fever."

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The gases used in different types of welding would include.

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Question

The gases used in different types of welding would include.

Oxygen and hydrogen

Oxygen, acetylene and argon

Oxygen and acetylene

Oxygen, hydrogen, acetylene and nitrogen

Easy

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The gases used in different types of welding would include

The gases used in different types of welding would include a) Oxygen and Hydrogen b) Oxygen, Hydrogen, Acetylene and Nitrogen c) Oxygen, Acetylene and Argon d) Oxygen and Acetylene

The gases used in different types of welding would include

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The gases used in different types of welding would include

A. Oxygen and Hydrogen

B. Oxygen, Hydrogen, Acetylene and Nitrogen

C. Oxygen, Acetylene and Argon

D. Oxygen and Acetylene

Solution(By Examveda Team)

The gases used in different types of welding would include Oxygen and Acetylene.

Join The Discussion

Join The Discussion Comments ( 3 )

Ravi P : 5 years ago

oxygen and acetylene uses as main components but argon also used for inert gas arc welding to protect weld pool ...sooo it may b the answer was option C

Niloy Roy : 7 years ago Option C

https://www.youtube.com/watch?v=q78tkR07P-E

Vishal M. : 7 years ago

Argon is also present in welding process to create voidness.

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