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Old 03-10-2018, 06:01 AM   #1
Hyper
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Default MIG v-band flange possible?

I am sick and tired of the stupid 2 bolt flat flanges in the DP to MD and MD to muffler connections, which always leak

since I jerk the DP on an off quite often, I am thinking about cutting the damm 2 bolt flange off, and welding a v band with lip
since its under the car and beauty is not a thing there, I don't feel like spending an arm and a leg on TIG welding services, and instead can have MIG welded it for free, question is - is this acceptable?
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Old 03-10-2018, 06:11 AM   #2
jvangelder
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I mig'd vband flanges on a previous car, a turbo RX7 and everything was fine for the 10k miles i put on the car.
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Old 03-10-2018, 01:22 PM   #3
I--RIDE--BIKES
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Theoretically itís possible for sure but you have to be very careful to not over heat and warp the flanges.
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Old 04-16-2018, 02:39 AM   #4
illuminaugty
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Theres an exhaust shop near me that MIG welds vband exhausts all of the time. Post some pics if you end up doing it!
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Old 04-16-2018, 06:56 AM   #5
rtv900
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Quote:
Originally Posted by I--RIDE--BIKES View Post
Theoretically itís possible for sure but you have to be very careful to not over heat and warp the flanges.
migs put way less heat into a part than tigging does
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Old 04-24-2018, 08:22 PM   #6
tracknerd
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As one who has ruined a couple vband flanges in the past year or so with a MIG... This is doable with a few caveats.

- Are we talking stainless or mild steel? MIG with stainless done right takes expensive gas. Even with the good gas, all of my attempts ended up not being completely air tight, which isn't overly important after the turbo, but something to be aware of.

- I can't say it enough, take your time and be really careful with your heat, they really like to warp, frequently rather subtly such that you might not even notice the warping until you have it all together but can't get your connection to stop leaking without adding gaskets (I've had acceptable luck with custom copper gaskets from a guy on ebay) and such.

- Protect your flanges from spatter really well. Given the close proximity of the flange lip to the joint and the size of most MIG nozzles, this can be tricky to do well without obstructing your access to the joint. My one attempt with MIG that didn't warp the flange got a couple spatter bits on the lip that I had to grind off and resulted in a couple of spots that the clamp doesn't slide as evenly on.

Now that I have both MIG and TIG, I'll never try MIG on these again.

In short, as long as it's all after the turbo, take your time and be careful, it's not ideal, but it's most definitely doable.
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Old 04-26-2018, 11:44 AM   #7
isotopesope
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Quote:
Originally Posted by rtv900 View Post
migs put way less heat into a part than tigging does
unless you run a pulser! i recently added a PC-300 to our Syncrowave 250 and am beyond impressed with the results. it reduces the heat affected zone tig-nificantly!
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Old 04-26-2018, 11:55 AM   #8
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Yes you can MIG it. I've never had good luck MIG welding stainless with tri-mix. It kept sugaring up due to not having enough post flow.
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Old 04-26-2018, 11:56 AM   #9
2slofouru
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What about:
-clamping mating flanges tightly together to remove some of the heat while welding
-making several small tacks around the circumference before completing the weld

If it's not for beauty, seems like you could do short sections, maybe even rotate to the opposite side, instead of one continous bead
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