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Yes, and No, Nitrogen can be used to purge gas lines prior to welding, but the correct answer depends on several things, mainly, your welding application. A significant amount of resistance welding applications use N2 as a suitable environment for welding. Other applications use N2 as a purge gas, and then purge the N2 with the process gas. That said, if you were going to be using a different inert gas (Argon, Helium, Xenon, etc.) to provide the actual the actual shield for the weld, then you would still need to displace (purge) the N2 from the lines.
The last statement leads to the question of; if you are going to have to purge the lines anyway, why do it twice? The answer to this question is pretty basic. Nitrogen is cheap. If you had to purge a lot of lines, or a large volume of space, you would rather use N2 to drive out the Oxygen and lower the dew point (moisture). Using one of the other welding gases would cost about ten times as much to perform the operation.
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Why inert gas use for welding?
Inert gases are use for welding is because in the welding process, the heat will actually hasten up the process of oxidation(rusting) happening on metals. Oxidation process(rusting) requires oxygen, thus, by using inert gas, it will purge the surrounding of oxygen preventing the oxidation process from happening.
Why would you require an approved purge burner and how would you purge?
I'm asking the exact same question...you go to Mohawk College don't you?
What is the welding procedure for welding P22 pipe to 304 stainless pipe?
I have not welded P22, but from what I read it is a low allow stainless that tends to get brittle. The welding techniques specified include a pre and post heat treat and on thicker materials a buffer layer of 316L with the final joint of 309 not sure what p22 pipe is but if it is carbon you should use a 308L filler with 100% argon purge 308L is a filler for fusing carbon steel and non carbon stainless. If it were 316 stainless you would want to use a 319 filler P22 is a steel alloy containing 2 1/4% chromium. It is weldable with most carbon steel alloy fillers such as E-70s2, ER-7018, etc. However, to weld it to a low grade stainless steel alloy such as 304, you would need to use a bi-metal welding alloy such as E-309, or ER-309. The above answer is incorrect regarding 308L being a filler for carbon steel to stainless steel. It is in fact 309 which is used for dissimilar metal welding when one component is stainless steel. I have also had good success welding two dissimilar metals together using inconel alloy welding electrodes such as INCO-182.
What is mean by purge air system?
pipe rolling pipe rolling In some systems used in hazardous environments, like computers on oil and gas rigs where explosive fumes are present, a purge air system is used to flush the equipment with clean air before it is turned on, so the air inside the equipment won't ignite from a switch making contact or an electrical problem.
What is steam purge?
Mixing the steam with another gas to remove the impurieties.
Can helium be used to purge gas pipes before welding?
Type your answer here... no
Should you insulate swimming pool pipes underground?
I see no reason why you would insulate them. When you close your pool for winter you will purge (empty) your pump and pipes. The water in the pool would freeze long before the water will in the pipes under ground.
How do you purge water pipes for the winter?
The best way to purge water from pipes for the winter is to open the tap for about 24 hours. It is also a good idea to install frost proof hydrants on all outside outlets.
A sentence with purge?
After living with monks for several weeks, Shannon decided to purge all the negative influences in her life.
What must you do before you introduce nitrogen into a refrigeration system?
If you are going to purge the system using nitrogen, rather than evacuating the system with a vacuum pump, you will first need to remove the refrigerant gas without releasing it to the atmosphere.
Can you use nitrogen in AC?
All Heating, cooling, and refrigerationtechnicians use nitrogen. Nitrogen is a noble gas and prevents copper pipes from oxidizing while brazing. It is also used to check systems for leaks. Leak testing with nitrogen can save loss of expensive refrigerant which is illegal to vent to the atmosphere. It's all so a dry gas containing almost no moisture so it can help to purge moisture from system that contains moisture. That being said, nitrogen can not be used in a operational systems. Home AC systems and refrigeration systems can not use nitrogen to cool. It will damage the compressor. Also onlylicensed techs should work on AC systems.
What are helpful uses of nitrogen?
It is used to purge moisture from optics. It is used in hydraulic accumlators and in recoil mechanisms of tanks and artillery.
How many cubic feet of nitrogen is need to fill a pipe 8 inch od by 100 ft length?
1000
When an underground gasoline storage tank is to be removed what chemical is used to purge the tank?
nitrogen or carbon dioxide. p 395 bottom exercise
What does purged mean?
A purge is an act of purging, or a cleansing of pipes. To purge means to clean thoroughly, or to free from guilt or sin.
How do you purge air from gas pipes?
If you have a gas oven just turn on a couple of the burners until the flames regulate and seem to be burning without any air bursts coming through
What would cause a black silt to come from the bathtub and shower faucet for about fifteen seconds?
You should purge all your water pipes of built in sediment. Don't forget, you are drinking the water too!
