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What should I know before welding flux core for automotive work? (self.welding)

submitted 1 year ago by DominicHillsun to c/welding

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Been doing stick welding for a bit, but when it comes to thin steel such as on cars, sticks blow right through. I was thinking about getting a flux core machine to do some exhaust work on my car because I don't want to mess with gas.

What should I know about flux core? What are the biggest cons about it?

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[–] Three_word_reply 2 points 1 year ago* (last edited 1 year ago) (1 children)

Regarding your points:

this just requires practice.
the settings require more adjustment for sure. The voltage is set based on the wire diameter and metal temperature. Wire feed speed is set based on metal thickness. There are charts you can look up that give you good starting points for dialing the machine in.
mig should have virtually zero spatter, and what is there should just brush off. If you're getting a lot of spatter there are three likely issues: a) voltage is set too high b) contact tip to work piece is too far c) the material is dirty, such as rust or paint, heavy mill scale, or a coating like zinc or galvanizing like on aluminized exhaust tubing

You'll find that the more you use mig, the more you will prefer it. It's an all around better process for home hobbiests and light fabrication.

[–] DominicHillsun 1 points 1 year ago (1 children)

Ah sorry, I guess it's called FCAW and not MIG. I am not using any gas to protect the weld. From what I've seen on the internet it will spatter no matter what, but I will check the polarity of the cables

[–] Three_word_reply 1 points 1 year ago

Yeah that's something you'll just have to deal with. It's better if you have a dc welder and not a super cheap ac machine