What gas from the flame can protect the molten weld metal from oxidizing?

What gas from the flame can protect the molten weld metal from oxidizing?

The carbon mono oxide (CO) present in the outer flame combines with the atmospheric air to produce the carbon dioxide which acts as the inert gas and creates an envelope to protect the molten weld pool. This carbon dioxide also forces the surrounding atmospheric air away from the weld.

What is one of the greatest risks associated with oxy acetylene welding?

Illness due to inhalation of fumes or gases formed during the process, such as metal fume fever from freshly formed metal oxide, illness from toxic fumes of metals such as lead, cadmium, beryllium, bronchial and pulmonary irritation from toxic gases such as oxides of nitrogen, fluorides; burns from the flame, hot slag …

What are the common engineering metals that Cannot be cut using an oxy acetylene gas?

Mild steel is comprised of 98\% iron, 1\% manganese, carbon up to . 3\% and various other elements in small amounts. Oxy-fuel cutting cannot cut non-ferrous metals such as aluminum, stainless, brass or copper. Elements such as chromium, nickel, molybdenum inhibit the ability to cut steel with the oxy-fuel process.

Should you light the blowpipe with a match or gas lighter?

Do not light the blowpipe with matches or lighters. Do not use oil, grease or other hydrocarbons.

What protects the molten metal when doing oxyacetylene gas welding?

The welder must add the filler rod to the molten puddle. The welder must also keep the filler metal in the hot outer flame zone when not adding it to the puddle to protect filler metal from oxidation.

What protects the molten metal from the atmosphere?

welding flux
The outer surface of the weld is protected from the atmosphere by a submerged-arc welding flux or by an inert gas, usually argon.

What are the four distinct hazards that must be guarded against when oxy acetylene welding?

Welders need to be protected against heat, sparks, ultraviolet rays, hot slag, fumes and toxic gases.

Why you should not see the flame during the welding operation?

Burns of the eyes and exposed parts of the body may occur owing to spatting of incandescent metal particles. Intense radiations from the flame and incandescent metal in the weld pool can cause discomfort to the operator and person in the vicinity of the operation and therefore precautions are necessary.

What’s hotter acetylene or propane?

Acetylene releases almost 40\% of its heat in the inner flame cone. Therefore, acetylene is better for cutting than propane. While temperature wise acetylene is hotter than propane the fact is that people are using propane for cutting incorrectly.

How hot is a cutting torch?

A cutting torch diverts the oxygen and mixes part of it with the fuel gas to create the preheat flame, forming the ring of flame around the cutting tip. This preheat flame will reach a temperature of 4400°F to 6000°F, depending on the fuel gas used as well as the ratio of oxygen to fuel gas.

Can you weld with LPG and oxygen?

The only real downside to using Oxy/Propane is that it can’t be used for actual Welding. Oxygen and Propane fuelled kits are however, ideal for Silver Solder, Brazing, Cutting and Heating. So as long as you don’t want to Weld, Oxygen and Propane is a great way to go!

What must be done if a flashback occurs?

If flashback occurs and the flame moves into the blowpipe, a shrill hissing sound will be heard. Close the blowpipe oxygen valve at once, then close the fuel gas valve. Note: This is the reverse of the normal shutting down procedure.

Why don’t metals burn easily?

The second reason that everyday metal objects don’t burn so well is that metals generally have a higher ignition temperature. Because the atoms in a typical metal are so tightly bound to each other, it takes more energy to break them apart and free them up, even if the oxygen atoms are sitting right next to them.

What happens if you burn steel?

Steel (technically speaking) doesn’t burn. But, when you get it too hot, the Carbon is burnt out of the steel, rendering it useless (and, really, it’s no longer steel).

Was there a molten metal in the NIST investigation?

NIST dodges the answer to that question by claiming that there was no molten metal to investigate. NIST engineer John Gross, co-project leader of the official investigation, denied the existence of the witness reports.