You need to use a shielding gas when welding aluminum. 100 % argon is most commonly used with aluminum.
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Hobart MIG ER5356 Aluminum Welding Wire — 1-Lb. Spool

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WIRE DIAMETER (IN.)
SPOOL SIZE
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Questions
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· 16 years ago
Can I use this wire to weld aluminum without gas?
I have a wire feed welder and I am using gasless flux wire on steel. Can I use aluminum wire the same way or do I need to have gas?
Originally posted on Hobart MIG Welding Wire, ER5356 Aluminum, .035in., 1-Lb. Spool, Model# H383808-R18-
ProductExpert37· 4 years ago
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glhNE· 12 years ago
I believe you need argon gas. I don't know of a flux core aluminum wire
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RobertV· 16 years ago
No, you must have shielding gas to weld aluminum. And it has to be 100% argon - carbon dioxide and trigas are only for welding steel. The thread on a bottle of argon is different than a bottle of carbon dioxide or trigas, but you can you use the same flow/pressure regulator by purchasing an adapter to thread on the bottle of argon. The adapter is a lot cheaper than buying a second flow/pressure regulator.
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· 15 years ago
Hi, is a shielding gas required for this type of aluminum welding wire?
Originally posted on Hobart MIG Welding Wire, ER5356 Aluminum, .030in., 1-Lb. Spool, Model #H383806-R18-
ncguy· 14 years ago
yes, you should always use shielding gas when welding aluminum. argon or argon/helium mix
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ProductExpert12· 15 years ago
A shielding gas will be required for welding with this type of aluminum wire.
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· 14 years ago
What is the spool diameter?
1 answerOriginally posted on Hobart MIG Welding Wire, ER5356 Aluminum, .030in., 1-Lb. Spool, Model #H383806-R18-
ProductExpert6· 14 years ago
The diameter of the 1# spool wire is 4 inches.
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