Is using an oxy-acetylene torch a possible way to go for welding together some exhaust piping. Sometime in the near future I need to get a new section of pipe with an 02 bung on it put in.

Shop wants $100 for it. I can do it myself if oxy-acetylene welding would work. I just gotta get my hands on a kit

 

You could, it would just take longer and be less convenient than using an arc, and would probably be more expensive once you'd paid for the gas.

Do you need a new section of pipe, or can you just weld a bung in what you've got now?

 

I can weld a bung in what I've got now. Just can't for the life of me get the old 02 sensor out. I'd like to be able to do that. Since I do want to look at headers in the future though, maybe leaving the old one in there would be so bad....

 

If you already had the torch's I'd say go for it, but if you gotta buy the stuff, then just have it done for the $100.

 

It depends on the material you're trying to weld. If it's mild steel, Oxy-Acetylene will work very well. If it's stainless or coated (aluminized) pipe, it will not work. You could also use a torch to heat up the old O2 sensor/bung and it will come out much easier then. We call them "hot wrenches".

TA

TA

 

If you have oxy-cetaline then i have a solution to get that o2 sensor out...

Heat the PIPE only... try not to heat the sensor. After you have applied heat for a few seconds (10-15 sec) then try to turn a wrench on the sensor... if this doesnt work heat again... if you heat it three times and it doesnt budge then leave it alone for about 10-15 minutes and come back to try again.

If you heat the pipe only it will cause the pipe to expand away from the sensor and ease tension... also use a bit of liquid wrench... just dont inhale the fumes as it evaporates from the hot steel... just soak it... heat it... soak it... heat it... each time letting the liquid wrench set for a second and then try wrenching on it.

Eventually the metal will lose it's grip... or you'll find they have welded themselves together and you're up **** creek...

We used this technique to loosen water piping on multiple types of water pumps torqued together at around 500-4000 ft/lbs... After about 10-50 years of sitting in water they tend to rust a bit and seize together.