Welding Gases: Difference between revisions
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=List= | =List= | ||
==Pure Gases== | |||
===Argon=== | |||
*Used in all [[GTAW]] (''short of potentially in conjunction with gases such as Helium'') and nearly all non-ferrous [[GMAW]] welds, | |||
===CO2=== | |||
*Used for carbon, and some low allow steels | |||
===Helium=== | |||
*Conducts heat Better than | |||
*Thus used for a "Hotter Arc" | |||
*Sometimes used with thick non-ferrous metals, and highly heat conductive metals like aluminum and copper which rapidly carry heat away from the Weld Pool and thus require more heat to achieve a good weld | |||
*However it floats away from the weld pool, and thus requires more gas usage | |||
*Also ''very''' expensive, and comparatively scarce (See [[Peak Helium]] / [[World Helium Reserves]] / [[Helium Production]] ) | |||
===Nitrogen=== | |||
*Can this be done? | |||
*[[Nitrogen as Shield Gas]] | |||
==Gas Mixes== | |||
===Argon-Oxygen=== | |||
* | |||
===Argon-Helium=== | |||
* | * | ||
===Argon-Helium-CO2=== | |||
* | |||
===Argon-Carbon Dioxide=== | |||
*Often referred to as "75-25' since it is 75% argon and 25% carbon dioxide | |||
*Cheaper than pure argon, and allows f | |||
=Sourcing= | =Sourcing= | ||
| Line 18: | Line 48: | ||
=Production= | =Production= | ||
* | * | ||
=References= | |||
*Modern Welding Pages: | |||
**~176 for GMAW Gases | |||
**~246 for GTAW Gases | |||
**Grab specific quotes maube even, as of now it's just paraphrasing | |||
***The book doesn't really mention ''why'' gas mixtures do what they do, so some papers may be of use for that aspect | |||
=Internal Links= | =Internal Links= | ||
Revision as of 00:25, 25 April 2022
Basics
- Most modern forms of welding use some form of Shield Gas to protect the Weld Pool from the atmosphere
- In the simplest form this is a pure Inert Gas
- In some instances, various aspects of the weldment can be modified via using a gas mixture, often with a Reactive Gas
- In the older terminology (Pre-GMAW ), there was Metal Inert Gas (MIG) and Metal Active Gas (MAG)
How They are Utilized
- Shield Gas on the Weld Torch / Welding Gun
- Purge Gas (Welding) ( ~pg 628 of Modern Welding )and Secondary Shielding (Welding) and Backing Shielding / Backing Gas ( ~pg 595 of Modern Welding ) (only really needed for Titanium Welding and other odd metals/alloys
- Can also be used in essentially a Glove Box but for welding ~pg 282 and 596 in Modern Welding (Called it a Controlled Atmosphere Chamber ?)
- This page will not cover gasses used for Weld Heat Treatment which are typically just the same as one would use for an Oxy-Fuel Torch / Air-Fuel Torch
List
Pure Gases
Argon
- Used in all GTAW (short of potentially in conjunction with gases such as Helium) and nearly all non-ferrous GMAW welds,
CO2
- Used for carbon, and some low allow steels
Helium
- Conducts heat Better than
- Thus used for a "Hotter Arc"
- Sometimes used with thick non-ferrous metals, and highly heat conductive metals like aluminum and copper which rapidly carry heat away from the Weld Pool and thus require more heat to achieve a good weld
- However it floats away from the weld pool, and thus requires more gas usage
- Also very' expensive, and comparatively scarce (See Peak Helium / World Helium Reserves / Helium Production )
Nitrogen
- Can this be done?
- Nitrogen as Shield Gas
Gas Mixes
Argon-Oxygen
Argon-Helium
Argon-Helium-CO2
Argon-Carbon Dioxide
- Often referred to as "75-25' since it is 75% argon and 25% carbon dioxide
- Cheaper than pure argon, and allows f
Sourcing
Production
References
- Modern Welding Pages:
- ~176 for GMAW Gases
- ~246 for GTAW Gases
- Grab specific quotes maube even, as of now it's just paraphrasing
- The book doesn't really mention why gas mixtures do what they do, so some papers may be of use for that aspect