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Posted by hubert on July 1, 2007, 2:14 pm
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Hi all
i am trying to stick weld a aluminium cylinder head.
problem is i cant get any penetration at all, the aluminium from the stick
melts, but hardly any heat goes into the casting, so the aluminium is
dropped on the workpiece.
I am using 3,5 mm AWS A5.3 E 4047 (din EL AlSi5 ) electrodes and a DC
welder (actually my tig welder) , reversing the polarity made no
difference.
anybody tried stick welding aluminium?
I am a bit at loss what to change, may be drop the power , to slow the
melting of the stick? or pre heating the part?
may be using even thicker electrodes?? the welder is a old fashioned huge
transformer type, so more power isnt a problem.
i managed pretty decent welds on pieces of aluminium scrap 3 mm thick, just
cant seem to get any burn in with bigger parts.
cheers
hubert
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Posted by Andrew Mawson on July 1, 2007, 3:04 pm
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>
> Hi all
>
> i am trying to stick weld a aluminium cylinder head.
> problem is i cant get any penetration at all, the aluminium from the
stick
> melts, but hardly any heat goes into the casting, so the aluminium
is
> dropped on the workpiece.
>
> I am using 3,5 mm AWS A5.3 E 4047 (din EL AlSi5 ) electrodes and a
DC
> welder (actually my tig welder) , reversing the polarity made no
> difference.
> anybody tried stick welding aluminium?
> I am a bit at loss what to change, may be drop the power , to slow
the
> melting of the stick? or pre heating the part?
> may be using even thicker electrodes?? the welder is a old fashioned
huge
> transformer type, so more power isnt a problem.
>
> i managed pretty decent welds on pieces of aluminium scrap 3 mm
thick, just
> cant seem to get any burn in with bigger parts.
>
> cheers
> hubert
>
>
You are setting yourself a difficult task there ! All the heat is
being sucked into the relatively cool aluminium head which has a far
higher thermal capacity than your 3mm test piece. You >>may<< get
better results pre-heating the head, however whatever you do, be aware
that most aluminium cylinder heads are an aluminuim silicon alloy and
are heat treated, and once welded will no longer have the same
physical properties that they had when new. Do a google on 'solution
heat treatment' for aluminium alloys.
AWEM
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Posted by jp2express on July 2, 2007, 10:39 am
Please log in for more thread options Andrew,
Doesn't aluminum also require AC? (Ignore the fact that he's trying to weld
a cylinder head)
I don't do much aluminum, so I want to tuck this info into my "good to know"
category.
"Andrew Mawson" wrote:
>
> You are setting yourself a difficult task there ! All the heat is
> being sucked into the relatively cool aluminium head which has a far
> higher thermal capacity than your 3mm test piece. You >>may<< get
> better results pre-heating the head, however whatever you do, be aware
> that most aluminium cylinder heads are an aluminuim silicon alloy and
> are heat treated, and once welded will no longer have the same
> physical properties that they had when new. Do a google on 'solution
> heat treatment' for aluminium alloys.
>
> AWEM
>
>
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Posted by Andrew Mawson on July 2, 2007, 11:32 am
Please log in for more thread options
>
> "Andrew Mawson" wrote:
> >
> > You are setting yourself a difficult task there ! All the heat is
> > being sucked into the relatively cool aluminium head which has a
far
> > higher thermal capacity than your 3mm test piece. You >>may<< get
> > better results pre-heating the head, however whatever you do, be
aware
> > that most aluminium cylinder heads are an aluminuim silicon alloy
and
> > are heat treated, and once welded will no longer have the same
> > physical properties that they had when new. Do a google on
'solution
> > heat treatment' for aluminium alloys.
> >
> > AWEM
> >
> >
>
> Andrew,
>
> Doesn't aluminum also require AC? (Ignore the fact that he's trying
to weld
> a cylinder head)
>
> I don't do much aluminum, so I want to tuck this info into my "good
to know"
> category.
Conventionally yes
AWEM
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Posted by Bruce on July 3, 2007, 1:11 am
Please log in for more thread options On Mon, 2 Jul 2007 16:32:36 +0100, "Andrew Mawson"
>
>>
>> "Andrew Mawson" wrote:
>> >
>> > You are setting yourself a difficult task there ! All the heat is
>> > being sucked into the relatively cool aluminium head which has a
>far
>> > higher thermal capacity than your 3mm test piece. You >>may<< get
>> > better results pre-heating the head, however whatever you do, be
>aware
>> > that most aluminium cylinder heads are an aluminuim silicon alloy
>and
>> > are heat treated, and once welded will no longer have the same
>> > physical properties that they had when new. Do a google on
>'solution
>> > heat treatment' for aluminium alloys.
>> >
>> > AWEM
>> >
>> >
>>
>> Andrew,
>>
>> Doesn't aluminum also require AC? (Ignore the fact that he's trying
>to weld
>> a cylinder head)
>>
>> I don't do much aluminum, so I want to tuck this info into my "good
>to know"
>> category.
>
>Conventionally yes
>
>AWEM
Stick welding aluminum is DCEP, if I remember correctly.
Bruce in Bangkok
(brucepaigeatgmaildotcom)
--
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> Hi all
>
> i am trying to stick weld a aluminium cylinder head.
> problem is i cant get any penetration at all, the aluminium from the