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#1 ukcat

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Posted 04 February 2019 - 04:42 PM

i need to perform a small bit of welding on my vehicle. a couple of small tacks on th1e exhaust system. i am aware that i must disconnect the battery but is there anything elsw needed. can any damage bw caused

#2 Nev

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Posted 04 February 2019 - 04:47 PM

i need to perform a small bit of welding on my vehicle. a couple of small tacks on th1e exhaust system. i am aware that i must disconnect the battery but is there anything elsw needed. can any damage bw caused

 

Not really, just be sure the earth clamp is always on good metal so the current can take the easiest path down it.

 

Personally, I never weld anything on the car, the effort of having/isolating electrical gremlins is too scary for me. poof



#3 vocky

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Posted 04 February 2019 - 07:33 PM

I would also recommend you keep the earth clamp as close to where you are welding as possible



#4 ukcat

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Posted 04 February 2019 - 08:48 PM

Thanks for the replys -The welding is on the u bend of the exhaust so presume i should earth clamp onto the exhaust as near to the welding as possible



#5 aquilaproejct

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Posted 05 February 2019 - 06:14 AM

I've seen warranty return shock absorbers where somebody has earthed out on a knuckle when welding. Arc has jumped between the shock rod and shock body when suspension is at full hang, blowing the chrome coating off the rod, which eventually cut the seal.

#6 sford

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Posted 05 February 2019 - 01:13 PM

Just take the ubend off. It's three bolts and one clamp.



#7 ukcat

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Posted 05 February 2019 - 03:20 PM

Just take the ubend off. It's three bolts and one clamp.

its a long story but have Problems with aftermarket cat back exhaust. basically the u bend is slightly too bent which puts the back box at to great an angle. this means that the exhaust has to be put under some tension to get the bolts into the os subframe mount as its out by about 30mm
i have removed the u bend flange and have set it up "unwelded" At the correct angle but need to tack in place hence it needs to be on the car

Edited by ukcat, 05 February 2019 - 03:21 PM.


#8 Exmantaa

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Posted 05 February 2019 - 03:28 PM

 

Just take the ubend off. It's three bolts and one clamp.

its a long story but have Problems with aftermarket cat back exhaust. basically the u bend is slightly too bent which puts the back box at to great an angle. this means that the exhaust has to be put under some tension to get the bolts into the os subframe mount as its out by about 30mm
i have removed the u bend flange and have set it up "unwelded" At the correct angle but need to tack in place hence it needs to be on the car

 

 

Just spot weld it in-situ after disconnecting the battery earth. Just put the weld clamp somewhere near on the exhaust part you're welding on.

(We often do a small spot weld there, as our exhausts have a habit of slowly rotating at the u-bend after installation... )



#9 ukcat

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Posted 17 February 2019 - 11:00 AM

http://s304.photobuc...html?sort=3&o=0

http://s304.photobuc...html?sort=3&o=5

http://s304.photobuc...html?sort=3&o=8

http://s304.photobuc...html?sort=3&o=9

 

Update - Managed to complete the exhaust welding ok earthed it at the backof the flange and all fine so thanks for the advise on that one - Basically i was never happy with the fit of the exhaust - The u bend seemed to be bent too much and it made the exhaust (backbox section)run across the width of the car at an angle that put a lot of tension into it -I Also found it impossible to get the flange to seal up properly against the cat flange and hated how the 2 flanges were different shape- From the pics you can now see that the flange runs at a slight different angle to how it was before (ive added some lines to show a right angle) and this now lets the exhaust hang without any tension 



#10 ukcat

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Posted 17 February 2019 - 11:37 AM

edited-image_zpsqrtd1asg.png

20190215_043910_zpswmlrnh5l.jpg

20190215_013607_zps1kmmxcua.jpg

20190215_013555_zpsi1p5y5w7.jpg

 

2nd attempt at getting pics to show !!! - You can see that originally the flared flange was approx 90 degree to the pipe but when re-welded it is a few degrees off square this shows the amount it needs to be to get the exhaust to sit correctly, And it fits perfect now ! I Have also ground the flange to match the cat flange (sad i know !!) - Anyway thanks again for the advice i received 

Cheers

Tony


Edited by ukcat, 17 February 2019 - 11:44 AM.


#11 vocky

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Posted 17 February 2019 - 01:36 PM

 

I Have also ground the flange to match the cat flange (sad i know !!)

 

nothing wrong with attention to detail thumbsup






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