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What should i do TIG weld or MIG weld my manifold? 

 

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 Post subject: What should i do TIG weld or MIG weld my manifold?
Posted: Sun Jan 27, 2008 2:12 pm 
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Hey guys

I have just finshed designing my (log design) turbo manifold for my EF

I went and talked to exhaust shop and he said he would MIG weld it cause it would penetrate the pipe better and i also went to engeneering shop and he said he would MIG weld it 4 the same reason.

the manifold is Steampipe with steel flanges.

I thought they were ment to be welded with TIG welders or something.


Plz Explain so i can go back to the shop with some idead of what i want and why.

Thx Jason

 

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Posted: Sun Jan 27, 2008 2:29 pm 
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For best penetration it should be welded with stick, but MIG will do the job for what you want.. TIG would be to fiddly and take much longer to weld..

 

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Posted: Sun Jan 27, 2008 2:31 pm 
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MIG will be perfectly fine, TIG is more for things that have to be 100% perfect

 

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Posted: Sun Jan 27, 2008 2:35 pm 
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Can you post some picks of your progress so far?

 

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Posted: Sun Jan 27, 2008 2:52 pm 
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mate, steer clear of that engineering shop..... MIG will NEVER penetrate like TIG can... a mig deposits wire filler regardless of the heat of the base metal. it will lay down wire without the base metal being liquid.. TIG on the other hand, is fully dependant on the operator to determine weld puddle size/temp and add filler accordingly.

This is WHY tig is for things that need to be perfect, strong, x-ray quality, made to last, and also, look beautiful.. MIG is for improved production time and very little else..

i did mig one manifold back before we had a tig, and ill never ever mig a manifold again...

 

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Posted: Sun Jan 27, 2008 4:10 pm 
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ebs_4l wrote:
mate, steer clear of that engineering shop..... MIG will NEVER penetrate like TIG can... a mig deposits wire filler regardless of the heat of the base metal. it will lay down wire without the base metal being liquid.. TIG on the other hand, is fully dependant on the operator to determine weld puddle size/temp and add filler accordingly.

This is WHY tig is for things that need to be perfect, strong, x-ray quality, made to last, and also, look beautiful.. MIG is for improved production time and very little else..

i did mig one manifold back before we had a tig, and ill never ever mig a manifold again...


Exactly.


The only thing the tig cant weld is Galv steel (the zinc will clog the tungsten) and aluminium if you dont have a AC machine with High Frequency (ie DC only scratch start).

If you are using steampipe with at least a 3mm thickness use the tig to weld it. You will get complete penetration with out it being excessive.

And if it is Stainless then it must be purged. otherwise inside it will have a big hairy catepillar around it (oxidation). Mild steel there is no need to purge.

 

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Posted: Sun Jan 27, 2008 4:28 pm 
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Hmm well the guy in the engineering shop was a tafe teacher in metal fabrication. he said that mig would penetrate good and tig wouldn't penetrate as well.

LOL i agree with you guys on tig over mig thats why i came here and ask.

he agreed to world it with tig if i wanted. Ive watched him mig and tig and oxy weld and he f**k amazing with them and he do me a dirt cheap cashy cause my old man get everything done threw him.

here some pic's from last week ive i don't have camera here to show you up to date stats

 

 

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Posted: Sun Jan 27, 2008 5:22 pm 
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hey mate im a boilermaker welder by trade and tig is the go! if welded correctly then peno will be perfect mig you will get splatter on it and also will not look as neat . and you can weld galv with tig you just grind the edges that your welding to remove the oxides in the material then your good to go
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Posted: Sun Jan 27, 2008 7:03 pm 
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how many other boilermakers here noticed it isn't steam pipe ?

steam pipe is seamless.

tig it.

 

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Posted: Sun Jan 27, 2008 10:16 pm 
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low_ryda wrote:
how many other boilermakers here noticed it isn't steam pipe ?

steam pipe is seamless.

tig it.


lol it ain't then i must be black pipe then well the straight pipe only bit with the seal all the bends don't have a seam.

Good eyes there

ill suggest tig welding it when i see him Tuesday cost me a bit more cause it slower but well worth it.

how long do you reckon it would take to weld up and cut holes in the main runner pipe?
hole needed 4 cylinder 2,3,4,5 and turbo flange and wastegate and just weld all up.

you say 3 hours 4 hours?

 

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Posted: Mon Jan 28, 2008 1:43 pm 
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steam pipe ?
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Posted: Mon Jan 28, 2008 7:32 pm 
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Don't make manifold with 90* bends like above!!! Use 30* bends or atleast weld to log on an angle ...
Tig for sure .. Too much splatter with mig....

 

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Posted: Mon Jan 28, 2008 8:15 pm 
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EBXR8380 wrote:
Don't make manifold with 90* bends like above!!! Use 30* bends or atleast weld to log on an angle ...
Tig for sure .. Too much splatter with mig....


why would i use 30* or weld on a angle that just screws with the exhaust flow. Look at snort performance and 6boost log manifold they all use the 90* bends and they work wonders.

 

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Posted: Mon Jan 28, 2008 8:50 pm 
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Xflow wrote:
EBXR8380 wrote:
Don't make manifold with 90* bends like above!!! Use 30* bends or atleast weld to log on an angle ...
Tig for sure .. Too much splatter with mig....


why would i use 30* or weld on a angle that just screws with the exhaust flow. Look at snort performance and 6boost log manifold they all use the 90* bends and they work wonders.


you have missed the point, he was reffering to the centre ports that intersect the main pipe at 90*, that is bad design, and you should use bends on them, you should also use bends where the entry into the turbo is, it will flow better, and keeps the cylinders divided into banks of 3, as it should be for divided scroll, which you have.

just looking at what you have now, you can see that the thing wont flow very well at all.

couple of pointers, once you have finished it, cut the flange plate so that each port is independant, then have it machined along with the turbo flange, and slightly enlarge all the bolt holes except the middle 4.

 

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Posted: Mon Jan 28, 2008 8:57 pm 
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the problem with bends on the center 4 runners is no one can cut the curve out of the 90* cause i already wanted that and curve out the the turbo flange i was going to do but it pushes turbo 2 far out and hits strut tower so i keep it in the extra 2-3cm and i got clearance or i got to put turbo on a 30* angle and get all to annoying.

 

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