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Technical Information | FAQ | FCAW
Flux cored Arc Welding (FCAW)

  1. When do I use an LAT-11 gasless flux core wire versus an LA-14 gasless wire?
  2. Why use a metal core wire compared to a conventional gas shielded flux core wire?
  3. What is the principle of operation of flux core welding?
  4. Is BlueshieldTM LA T-91 wire the same strength as and E 7018 covered electrode?
  5. What is Air Liquide'sTM FCAW wire that is equivalent to LA 7018, LA 18LMP, LA 18PLUSTM, LA 18PLUS LMP or E7018-1 covered electrodes?
  6. What is the difference between a BlueshieldTM LA T-91 wire and the Blueshield LAT-91LF?
  7. What are the advantages of gas shielded flux core versus self shielded flux core?

1-When do I use an LAT-11 gasless flux core wire versus an LA-14 gasless wire? (top)
The LAT-11 wire is carbon steel all position multi pass gasless wire for material thicknesses up to ½ inch whereas the LAT-14 is a single pass carbon steel wire for thin gauge materials such as automotive exhaust and sheet metals.


2-Why use a metal core wire compared to a conventional gas shielded flux core wire? (top)
Metal core wires have higher deposition efficiency than flux core wires. If you buy 100lbs of flux core you will deposit roughly 85 lbs of weld metal. If you buy 100 lbs of metal core you will deposit roughly 95 lbs of weld metal. Welding out of position with an all position flux core wire is faster and easier than a metal core wire. With the metal core wires there is no slag to clean up after welding. Metal core wires as a rule tend to have lower weld metal hydrogen values than flux core wires and so should be less prone to cracking when welding crack sensitive steel.


3-What is the principle of operation of flux core welding? (top)
Flux core wires are like a stick electrode turned inside out. These wires are essentially a tube with metal powders, deoxidizers, arc stabilizers and other alloying elements squeezed into the tube. Some flux core wires are designed to work with shielding gases while others are designed to work without shielding gases.


4-Is BlueshieldTM LA T-91 wire the same strength as and E 7018 covered electrode? (top)
Both of these products have the same minimum tensile strength and charpy imact requirements which is a minimum of 70,000 psi or 490MegaPascals and 27Joules a â30 C impact temperature. The LA T-91 typically has a slightly higher tensile strength.


5-What is Air Liquide'sTM FCAW wire that is equivalent to LA 7018, LA 18LMP, LA 18PLUSTM, LA 18PLUS LMP or E7018-1 covered electrodes? (top)
BlueshieldTM LA 91T12M is the equivalent FCAW wire to these Stick Electrodes.


6-What is the difference between a BlueshieldTM LA T-91 wire and the BlueshieldTM LAT-91LF? (top)
LA T91LF will typically yield lower fume levels during welding when comapared to LA T91 when using the equivalent shielding gas.


7-What are the advantages of gas shielded flux core versus self shielded flux core? (top)
Gas shielded wires tend to have deeper penetration than gasless wires and better mechanical properties. Gasless wires have the advantage that no shielding gas is required so gasless set ups are more portable and can be used outside with less porosity problems than gas shielded flux core wires.


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