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Old 07-07-2016, 05:50 AM
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Default Flaking while welding

Not sure what was going on with this steel. These metal flakes were flying off everywhere while welding it like you sometimes get when cold bending hot rolled.


This is the backside of the weld in both pictures. It mainly happened when I touched up any spots that didn't get full penetration, and then the flaking would start, could easily see the bits flying everywhere while I was just doing a fusion weld.


I had run a flap disc over it too beforehand. Battled porosity too and even had to completely cut one weld apart and redo it. Heard some Chinese manufactured sheet metal can do this.
I don't know anything about the steel as they were rolled in SoCal and imported over here.
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Old 07-07-2016, 07:02 AM
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Nice looking weld Marcus!
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Old 07-07-2016, 08:22 PM
SWT Racing SWT Racing is offline
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Is this Oxy/Acetylene or TIG? You said it mainly happened when you were fusion welding. Did you aggressively wire brush after the first pass?
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Old 07-08-2016, 04:03 AM
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Was TIG and did wire brush it. Today I lightly used the flapper disc over the backside of the weld before doing any touch ups and was fine.
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Old 07-13-2016, 09:19 PM
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Quote:
Originally Posted by Gojeep View Post
Was TIG and did wire brush it. Today I lightly used the flapper disc over the backside of the weld before doing any touch ups and was fine.
Yep. TIG does not like the extreme carburization that can happen on the back side. It's like welding over mill scale. It is the carbon precipitating out of the parent material.
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Old 07-14-2016, 03:46 AM
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That is exactly what it felt like, welding over mill scale on hot rolled.
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Old 07-14-2016, 05:28 AM
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The shape of those flakes look as if they have come off after the weld has solidified ie weld shrinkage excessive or fast quenching. Did you use rod where you touched up? Less likely was the wheel contaminated from another job?
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Old 07-14-2016, 04:28 PM
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Do you use a gas lens or ordinary small ceramic/collet holder? Looks to me like it's a lack of gas coverage and the oxidation is caused from a relatively fast welding speed with the weld cooling after the gas shield has passed the weld pool. If you're not using a gas lens, I'd strongly recommend you do and get the biggest ceramic possible.
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Old 07-14-2016, 07:15 PM
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Quote:
Originally Posted by Gareth Davies View Post
Do you use a gas lens or ordinary small ceramic/collet holder? Looks to me like it's a lack of gas coverage and the oxidation is caused from a relatively fast welding speed with the weld cooling after the gas shield has passed the weld pool. If you're not using a gas lens, I'd strongly recommend you do and get the biggest ceramic possible.
It is definitely lack of gas coverage. . .it's the back side of the weld in the pictures.

I agree on the gas lens though. Aside from welding with other people's machines, or when none were available, I haven't welded without a gas lens in probably 10 years.
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Old 07-15-2016, 03:36 AM
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Never owned a gas lens but all the tig welds get ground smooth anyway. Thanks for the feed back.
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