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Mig welding cast - bashbarnard - 23-03-2017
So ive got a turbo and a manifold. That are to cheap to make adaptor plates for and will be binning off the build once theyve done show season this year so I dont really care about them. However I would quite like the welds to hold up. Plan was get them HOT as HOT then mig them together.
Some people say about leaving under sand afterwards? Lets it cool slowly, Any suggestions?
RE: Mig welding cast - Danny Wideboy - 23-03-2017
I've had plenty of success welding cast turbos onto manifolds, cold or pre heated. Thin stuff will crack though, if its thick stuff, JFDI.
RE: Mig welding cast - Chris_90 - 23-03-2017
I cant weld for sh*t and I've welded a few turbos to manifolds with a mig not even a decent mig tbh, and it never fell off, didn't preheat or cool down. Maybe I got lucky? But never had an issue.
RE: Mig welding cast - Stef205 - 23-03-2017
the process depends if its cast iron or steel. Touch a grinder on it and note the colour of sparks.
Mig welding cast - bashbarnard - 23-03-2017
(23-03-2017, 09:02 PM)Stef205 Wrote: the process depends if its cast iron or steel. Touch a grinder on it and note the colour of sparks.
Yeah i heard about this somewhere, i dont often weld cast and when i do its always little like egr blank etc
(23-03-2017, 08:25 PM)Danny Wideboy Wrote: I've had plenty of success welding cast turbos onto manifolds, cold or pre heated. Thin stuff will crack though, if its thick stuff, JFDI.
Nice and thick this stuff
(23-03-2017, 08:50 PM)Chris_90 Wrote: I cant weld for sh*t and I've welded a few turbos to manifolds with a mig not even a decent mig tbh, and it never fell off, didn't preheat or cool down. Maybe I got lucky? But never had an issue.
I thankfully can weld after many years of practice and a huge amount of guidance from various people. However ive never done cast apart from small parts. I suspect beat thing is to tack it with the little welder at home then get to it with the decent obe at work
RE: Mig welding cast - ozonehostile - 24-03-2017
Personally I'd tig a job like that, but mig will do it. Preheat the f*ck out of the cast and make sure it's clean
Mig welding cast - bashbarnard - 24-03-2017
(24-03-2017, 06:29 AM)ozonehostile Wrote: Personally I'd tig a job like that, but mig will do it. Preheat the f*ck out of the cast and make sure it's clean
Yeah id live to tig it, but i dont have a tig and or cant use one so theres that lol. Its just gotta last one show season
RE: Mig welding cast - welshpug - 24-03-2017
mig is useless, you need arc or gas rods.
RE: Mig welding cast - Jonny81191 - 24-03-2017
(24-03-2017, 08:11 AM)welshpug Wrote: mig is useless, you need arc or gas rods.
This statement pops up every time someone asks this question..
Whilst I won't suggest that it's best practice to do so, you can, in my experience, successfully mig weld cast manifolds to turbos. I always cut as deep a vee as reasonably possible into the join (angle grinder with a grinding disc is good, to a depth of at least 5mm). I also preheat, because it seems to help get good penetration. Using this method I've yet to have a weld in cast fail despite people's suggestions that it won't work.
RE: Mig welding cast - darrenjlobb - 24-03-2017
(24-03-2017, 08:11 AM)welshpug Wrote: mig is useless, you need arc or gas rods.
Fairly pointless comment. And obviously havent done much of it yourself if that is your view?
In the text book maybe, but for most people, if you have a half decent welder, you will get away with it just fine. I would personally pick the stick welder up for most cast jobs, as yes, it does do a better job, but you can certainly get away with getting a decent, long lasting weld with a MIG if you take the time to do it properly. As already said, works best if you heat it up, and let it cool slowly, I find it more effective to have a fair weld fillet gap, rather than butting up directly, gives it some slight space to move / contract and will prevent it cracking. There is a bit of a nack to it, but will work just fine.
Also worth pointing out that some of the hash ups I have removed from cars over the years (dirty cast turbo to manifold welding, which looks like its been done with a 2watt sealey welder with 0 penetration), have all still been solid, and not failed, and can bet none of these were heated up etc! Obviously this is not good practice, but what im saying is, if they survive, then chances are if you take the time to do the job half correctly, you will be just fine. Don't believe all the stuff you read on the internet
RE: Mig welding cast - Stef205 - 24-03-2017
Bloody arc would be the last thing id use! tig or mig, ive mig'ed plenty of cast items before with great success. Preheat it well, weld with plenty of power and heat and let it cool naturally.
RE: Mig welding cast - bashbarnard - 24-03-2017
(24-03-2017, 06:07 PM)darrenjlobb Wrote:(24-03-2017, 08:11 AM)welshpug Wrote: mig is useless, you need arc or gas rods.
Don't believe all the stuff you read on the internet
Just a good rule for life in general