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Author Subject: does a blow hole matter? (welding)
jimmyhackers

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Location: birmingham

Registered: 14 Jun 2011

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Post #1
just got my car back from the mot station.

i failed on one item. Sad subframe mounting area is excessively corroded offside front

essentially its the little bracing peice near where the fuel pipes run out the engine bay onto the flat underside.

mot man qouted me 150 to weld in a new piece......

so i had a go myself (blame ed china on wheeler dealers)

needless to say i used an ALDI arc welder to weld a new plate on......

my welds are messy, blobby, to big, but functional.

but as the title sugest i have a few blow holes "to proove how good the penetration is"

do i
leave them?.....fill them (with filler)? fill them (get my mate and his proper tig to weld fill)?

being a lazy bas**rd i just want to leave them.......but in doing so can mot man fail me?

thanks for your help
jim

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the world is changed by people in sheds
Posted 9th Jan 2016 at 14:41
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craig903

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Location: whitstable

Registered: 08 Jul 2013

Posts: 273

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Post #2
Well stitch welding(weld an inch, miss an inch etc) is generally stronger then seam welding so I doubt a few little holes would matter.

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Posted 9th Jan 2016 at 14:48
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t3ora

Regular

Location: England

Registered: 22 Dec 2009

Posts: 316

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Post #3
The plate should be full welded to a good standard
You can't spot weld it on or weld a inch and miss a inch etc

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Road/track car coming together slowly
Posted 9th Jan 2016 at 15:03
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superchargedblack1997gti6

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Location: guildford

Registered: 15 Aug 2009

Posts: 2,376

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Post #4
Stitch weld isn't stronger than seam weld I'd get it done properly Jimmy. Smile

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Super high boost Completed, destroyer of gearboxes and 160mph club
Posted 9th Jan 2016 at 16:41
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aaron6

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Location: On the sofa in maidstone

Registered: 16 May 2006

Posts: 5,840

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Post #5
superchargedblack1997gti6 wrote:
Stitch weld isn't stronge than seam weld I'd get it done properly Jimmy. Smile
More weld is obviously stronger. Provided it is layed down properly. A weld should not be messy. If it's bobby it most likely has not stuck it properly. Grind it back off, do it again and fill the holes. Holes look sloppy and instil much faith for the mot'er. Make sure you grind back to as much fresh metal as possible. What sized rod are you using?

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Posted 9th Jan 2016 at 16:40
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jimmyhackers

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Location: birmingham

Registered: 14 Jun 2011

Posts: 1,144

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Post #6
thanks for the info.....

im using the smallest sticks i have 1.6mm.

its not blobby as in patchy. more like as in there are sections of thick weld, and sections of really thick weld. and a few pea-ish sized holes

http://www.motuk.co.uk/mot_appendix_c.htm

had a read of this..... lot of ..... what if and buts.....

but as far as i can make out from it all.....
spot welding is fine if the part your replacing/repairing was spot welded.
the old peice im doing seems either spot welding or bonded or both (or all three at the same time)
might need someone on here to clarify. http://306oc.co.uk/forum/archive/index.php?thread-3767.html not my car or thread but same rusty part/area ive replaced

then the genral jist on that mot page seems to be if the repair is as strong (or better) than the orignial part let it pass.

then section 11...... says basically if you cant tell how the repair was done (due to excessive underseal possibly) pass but advise

what ive done is very much so sound, and very much so overkill on strength, its just not pretty.

im tempted to silicone fill the holes i made and underseal hide the uglyness.

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the world is changed by people in sheds
Posted 9th Jan 2016 at 17:23
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aaron6

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Location: On the sofa in maidstone

Registered: 16 May 2006

Posts: 5,840

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Post #7
I would grind back oversized welds to make them more uniform. If the look good the mot'er will have a harder time moaning. So make the welds more uniform, get rid of spattering personally would fill the holes. Just be sure to knock of the slag on the welds and back to back tack to fill the gaps.

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See the sheer power and might of the lesser known burrowing owl.



Posted 9th Jan 2016 at 17:37
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jimmyhackers

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Location: birmingham

Registered: 14 Jun 2011

Posts: 1,144

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Post #8
finished up the first coat of underseal.....thought id share my handy work with you guys

see how bad you think it is






pity i didnt take pictures of it beforehand......

on the question of the second coat.....(tin says nothing annoyingly except dry in 24hours).....

so does that mean i can put another coat on in 24hours? (i used hammerite underbody seal)

thanks
jim

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the world is changed by people in sheds
Posted 11th Jan 2016 at 08:53
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aaron6

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Location: On the sofa in maidstone

Registered: 16 May 2006

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Post #9
Looks alright from the piccys. Well done fella.

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See the sheer power and might of the lesser known burrowing owl.



Posted 11th Jan 2016 at 10:06
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jimmyhackers

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Location: birmingham

Registered: 14 Jun 2011

Posts: 1,144

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Post #10
it passed, no advisory.

yay

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the world is changed by people in sheds
Posted 16th Jan 2016 at 12:24
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aaron6

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Location: On the sofa in maidstone

Registered: 16 May 2006

Posts: 5,840

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Post #11
Thumbs up

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See the sheer power and might of the lesser known burrowing owl.



Posted 16th Jan 2016 at 18:41
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