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When I was selling tools 6-9 years ago all the 'economical' MIG welders' core parts were manufactured in Italy. Didn't matter if the final product came from an American, Japanese or Korean company. That might make a difference in your decision on how much to lay out $$$-wise.
The 'flux' in flux-core wire provides the shielding gas when welding. Not much flux there so the shielding isn't as great as when a bottle is used. In regards to welding exhaust pipe flux-core will do o.k. strength-wise but it won't be as pretty as a bottle job. We always refer to a flux-core job as 'pigeon-poop' because of it's usual appearance.
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ASE Certified Master Automotive Technician w/L1.
ASE Certified Master Medium/Heavy Truck Technician.
Certified EVT (Emergency Vehicle Technician)
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