Depends on the type of material to be welded, the size of the flame, and in my situation slowly deteriorating eyesight. Basically shade 4 or 5 will be adequate. As dark as 6 on aluminum. You will be able to tell if you aren't using a dark enough shade as you can get a "flash" ( Like a sunburn on the eyes). Start with a #5 and go from there.
farting gas:)
Normally, acetylene, which is a colorless gas, C2 H2, that smells like ether
The gas that is used for welding is a pure hydrocarbon compound (C2H2).
Oxygen is used as active gas during MIG welding, spray transfer. It increases penetration and travel speeds. It is used only is small amounts though ususally 1%-5%. +++ The question mentioned "gas" welding, not any form of electric-arc process, and in oxy-acetylene and oxy-hydrogen welding the oxygen is necessary to raise the fuel-burning temperature to above the melting-point of steel.
Depends on what you think of as normal welding. Gas welding use oxygen-acetylene. MIG/TIG use Argon. MAG, use an argon-something mix. Depending on what materials you are welding, there are some more options tha might be used.
If by gas welding you mean-oxyacetylene welding. The difference is just that arc welding requires a darker shade of lens. When oxyfuel gas welding (OFW) usually a shade 5 lens is recommended. When arc welding, a minimum of shade 10 lens should be used (actually shade should be determined by amount of current used).
the welding amperage being used
A darker helmet shade, compared to gas welding. A shade of 10 for 70 amps, it works up from there, or you could buy a auto-darkening hood which you can see out of, but when you strick the rod on the metal it darkens to the right shade for you to still see out of.
The Type of welding you are doing, the brightness of the arc.
oxygen and acetylene gas Argon gas is used in MIG and TIG welding
The type of welding commonly used in welding LPG gas cylinders is known as MIG welding, which stands for Metal Inert Gas welding. This process involves feeding a wire electrode through a welding gun, which is then melted and used to join the metal pieces together. MIG welding is preferred for welding LPG gas cylinders due to its efficiency, reliability, and ability to produce high-quality welds. If you're in need of LPG gas cylinders near you, ensure safety and quality by relying on trusted suppliers and manufacturers.
Some methods are used: - electron beam welding - laser beam welding - gas wolfram arc welding - gas metal arc welding - resistence welding - brazing
farting gas:)
why oxyacetylene filler rods cannot be used for gas tungusten ar welding
TIG welding uses Argon.
API 1104 & asme B31
The helmet holds the lens. Lenses come in different shades (darkness). Use the correct shade. Most welding applications call for a shade #10. TIG weldors usually use a shade #9. Plasma applications can call for a shade #11.