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Welding A Subframe

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Posted 13 January 2018 - 08:37 PM

Hi all,


My mini has a very small hole in the rear subframe. Its not structural. I've heard welding a subframe can mean it fails an MOT. Is this true? If so will it be best if I buy a new subframe?





#2 sonikk4


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Posted 13 January 2018 - 09:14 PM

A subframe is structural in itself, however if you do a decent enough repair to make it look original then you will be fine.

#3 dyshipfakta


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Posted 13 January 2018 - 09:39 PM

Small holes will become larger though and best not to just scab a plate over it.

#4 robminibcy


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Posted 13 January 2018 - 10:01 PM

not sure where 'welding subframes fails mot' has come from though I've heard it before. A hole of any sort in a subframe is structural so should fail mot though but provided its done properly there's no issue welding it. They are welded together originally anyway! Other thing to consider as well is that its likely there's more rust lurking inside the box sections so whilst a weld repair will get you a few more years id consider replacing it at some point with a brand new one if nothing else for peace of mind 

#5 rkde


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Posted 13 January 2018 - 11:24 PM

I jig and weld subframes. Done it several times, if the jobs done correctly there will be no issues nor any way the MOT garage would spot it. They come from the factory welded...

As others say that hole will be a lot bigger by the time you have repaired it or should I say cut the rot out. I have a box section jig to hold it correctly while I cut out the layers - In time it probably costs me more in my time than it would do to go out and buy a new frame...

#6 minimans


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Posted 14 January 2018 - 02:51 AM

I welded two small patches to mine on the 1960 as they were the original frames, just make sure you dig out all the rust from the panel your repairing and treat with rust converter before closing it all up.

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