Is this rust, and should I be concerned

[abecker]

A while back I was putting running boards on my JL Sport and noticed these spots, and washed them to make sure it wasn't just dirt. Are these spots something I should be concerned about as they are directly on the welds?

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[Chocolate Thunder]

Those welds look OK IMO. That’s not rust.

 

[Jeepsterfreak]

Slag?

https://www.jlwranglerforums.com/forum/threads/rusting-welds.5779/page-5

 

[fat_head]

Slag?

https://www.jlwranglerforums.com/forum/threads/rusting-welds.5779/page-5

GMAW doesn't produce slag. That's kind of the whole point of it. And yes OP, your welds are oxidizing (rusting) like all the rest of us.

 

[Jeepsterfreak]

GMAW doesn't produce slag. That's kind of the whole point of it. And yes OP, your welds are oxidizing (rusting) like all the rest of us.

So no flux is used for the frame welds to cause slag?

Is this rusting normal and nothing to worry about?

 

[Fuel Fire Desire]

Surface rust on the frame is NBD. The entire underside of the frame and skid plates were rubbed down to bare metal with surface rust throughout on my JK from dragging it through mud, sand, and high centering. It’s when it starts to pit you have an issue.

 

[fat_head]

So no flux is used for the frame welds to cause slag?

Is this rusting normal and nothing to worry about?

No flux is used with gas shielding. Rusting welds seems to be "normal" on JLs, but I wouldn't call it normal in the car industry as a whole.

 

[Jeep_Dude]

Slag?

https://www.jlwranglerforums.com/forum/threads/rusting-welds.5779/page-5

Looks like a buildup of silicon slag, normal in GMAW process, even with shielding gas. is it a reason to be concerned, no. Could you touch up with a rust preventive paint, sure you could.

 

[fat_head]

Looks like a buildup of silicon slag, normal in GMAW process, even with shielding gas. is it a reason to be concerned, no. Could you touch up with a rust preventive paint, sure you could.

You keep saying "silicon slag". I've never heard of that in GMAW. I'm no journyman welder so please post me some links where I can read about this phenomenon in GMAW.

 

[Jeepsterfreak]

You keep saying "silicon slag". I've never heard of that in GMAW. I'm no journyman welder so please post me some links where I can read about this phenomenon in GMAW.

Here’s a link that discusses silicon content in the base metal and wire.

http://www.academia.edu/33297767/Th...formation_location_in_cold_metal_transfer_CMT

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