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Author Topic: how to weld sensor bung on titanium exhaust?  (Read 4710 times)

Offline jjckflsh

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how to weld sensor bung on titanium exhaust?
« on: June 13, 2014, 10:43:43 AM »
Hi,

Need to weld a bung on a titanium exhaust for a temp sensor.   Not sure what to do.  All the welders that I have talked to are saying they can't do it.  Just to drill the hole I guess is a problem.   I would appreciate any help.

Thanks,

Jack

Online RansomT

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Re: how to weld sensor bung on titanium exhaust?
« Reply #1 on: June 13, 2014, 11:08:48 AM »
Oh my, I went down that rodeo recently.   It takes a special setup to weld Ti.  Then when you can find someone to do it, you can't find the fittings. Other than Ti O2 bungs, you must get anything else custom made because you have to weld Ti to Ti, can't use Stainless Steel.
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Re: how to weld sensor bung on titanium exhaust?
« Reply #2 on: June 13, 2014, 11:25:21 AM »


It really doesn't take any special equipment to weld titanium other than a piece of titanium filler rod. Same setup on a tig to weld stainless. Most shops don't want to deal with it, especially on the extremely thin material typically on header tubes, if it is an aftermarket system.
« Last Edit: June 13, 2014, 11:39:19 AM by sportbikeryder »
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Offline turbo051k

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Re: how to weld sensor bung on titanium exhaust?
« Reply #3 on: June 13, 2014, 06:55:43 PM »
Possibly because most shops cant justify spend ridiculous money on Ti tig wire;its more than $80lb last time I bought some and all the welding supply houses I tried wouldn't sell smaller quantities. It also has to be purged on the inside or the weld will be brittle and crack. Basically its a pain in the ass,but straightforward....
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Offline Rocketgeezer

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Re: how to weld sensor bung on titanium exhaust?
« Reply #4 on: June 14, 2014, 10:44:34 PM »


It really doesn't take any special equipment to weld titanium other than a piece of titanium filler rod. Same setup on a tig to weld stainless. Most shops don't want to deal with it, especially on the extremely thin material typically on header tubes, if it is an aftermarket system.
We used a homebuilt cabinet to do Ti stuff, had it setup like a sandblast cabinet, filled cab with argon, and had at it, it was about 3ft square, maybe a little bigger, easily got a bike pipe in it, kind of like anything else, must be clean and weld area purged of air
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Offline jjckflsh

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Re: how to weld sensor bung on titanium exhaust?
« Reply #5 on: June 15, 2014, 09:42:41 AM »
Hey Thanks for the Replys!

This is what i've done so far:

1. Tried to find a 1/8th Titanium Compression Bung.  Pretty much non existent?  Which is strange, because you would think this not a uncommon request for bikes or tuner cars.

2.  Tried to find Welder.  They thank me kindly, then say they can't do it.  I've even tried specialty machine shops.


So now specifically what are my options?

Can I in any way use the Stainless Steel bung that came with the sensor? 

How do I go about finding some one with the equipment to weld this?

Or is this a No Go?

Thanks,

Jack

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Re: how to weld sensor bung on titanium exhaust?
« Reply #6 on: June 15, 2014, 10:54:55 AM »
Gsxr-boy750 welded mine and did a great job.  My EGT bungs were custom made by a friend of a friend from bar Ti.
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Offline turbo051k

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Re: how to weld sensor bung on titanium exhaust?
« Reply #7 on: June 15, 2014, 03:29:31 PM »
Can I in any way use the Stainless Steel bung that came with the sensor? 

Or is this a No Go?

Thanks,

Jack
That would be a big NO lol.
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Offline MJ Williams

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Re: how to weld sensor bung on titanium exhaust?
« Reply #9 on: June 15, 2014, 07:45:07 PM »
http://www.aemelectronics.com/products/wideband-uego-air-fuel-controllers/no-weld-o2-sensor-mounts

Will that work for you?   If it is a straight section of pipe, may be a solution.
Any day on a motorcycle like this that ends just needing parts and labor is a good day.
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Offline MICHAEL MATHEWS

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Re: how to weld sensor bung on titanium exhaust?
« Reply #10 on: June 15, 2014, 08:23:58 PM »
This may sound strange,but I used the bung as a nut.Slipped the O2 sensor through the hole in the pipe and put the bung inside and tightened it up.

Offline jjckflsh

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Re: how to weld sensor bung on titanium exhaust?
« Reply #11 on: June 16, 2014, 11:05:10 PM »
This is a EGT Sensor that uses a 1/8 NPT compression fitting for the bung.  I don't know if it will work with that.

Thanks,
Jack

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Re: how to weld sensor bung on titanium exhaust?
« Reply #12 on: June 17, 2014, 05:43:44 AM »
They make clamps for those as well if you want to try a clamp

http://www.amazon.com/Exhaust-Gas-Technologies-Inc-Stainless/dp/B00E5P1Y10
Any day on a motorcycle like this that ends just needing parts and labor is a good day.
4.82, 158.67mph 1/8th mile 7.350, 200.32mph 1/4 mile Riding

4.51, 171.75mph 1/8th mile  6.908, 212.83mph 1/4 mile Tuning

Online RansomT

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Re: how to weld sensor bung on titanium exhaust?
« Reply #13 on: June 17, 2014, 08:09:09 AM »
This is a EGT Sensor that uses a 1/8 NPT compression fitting for the bung.  I don't know if it will work with that.

Thanks,
Jack

I looked high and low, could not find any Ti 1/8" NPTs "on the shelf".
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Offline Cubano100

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how to weld sensor bung on titanium exhaust?
« Reply #14 on: December 31, 2014, 06:06:04 PM »
Did you ever get this done?

Offline jjckflsh

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Re: how to weld sensor bung on titanium exhaust?
« Reply #15 on: January 01, 2015, 08:08:42 AM »
Unfortunately no, I just went with a stainless system.

Offline MJ Williams

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Re: how to weld sensor bung on titanium exhaust?
« Reply #16 on: January 01, 2015, 08:44:48 PM »
Just for information these guys will do the welding at a reasonable price.
They do some of the finest heli-arc work that I have seen  :thumb:.

https://www.speedfactoryracing.net/
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Offline dave393

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Re: how to weld sensor bung on titanium exhaust?
« Reply #17 on: October 10, 2015, 01:37:37 PM »
I know this post is old but Tucker Rocky has ti afr bungs in the book. Don't know about 1/8 npt fittings. I tig welded a ti bung in this summer it is straight forward not that hard to do. 
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